CN114156487B - A pole piece and a lithium ion battery - Google Patents
A pole piece and a lithium ion battery Download PDFInfo
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- CN114156487B CN114156487B CN202111434303.0A CN202111434303A CN114156487B CN 114156487 B CN114156487 B CN 114156487B CN 202111434303 A CN202111434303 A CN 202111434303A CN 114156487 B CN114156487 B CN 114156487B
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- Prior art keywords
- pole piece
- protective layer
- mass
- carbide
- nitride
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 65
- 239000011241 protective layer Substances 0.000 claims abstract description 96
- 239000010410 layer Substances 0.000 claims abstract description 69
- 239000000463 material Substances 0.000 claims abstract description 67
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 38
- 239000010954 inorganic particle Substances 0.000 claims abstract description 31
- 239000006258 conductive agent Substances 0.000 claims abstract description 22
- 239000011230 binding agent Substances 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 239000011149 active material Substances 0.000 claims description 27
- 150000004767 nitrides Chemical class 0.000 claims description 18
- 229910052755 nonmetal Inorganic materials 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 7
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims description 6
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 6
- -1 magnesium nitride Chemical class 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 4
- 150000001247 metal acetylides Chemical class 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 4
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 claims description 3
- 229910052582 BN Inorganic materials 0.000 claims description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 3
- 239000005997 Calcium carbide Substances 0.000 claims description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 3
- 229910026551 ZrC Inorganic materials 0.000 claims description 3
- OTCHGXYCWNXDOA-UHFFFAOYSA-N [C].[Zr] Chemical compound [C].[Zr] OTCHGXYCWNXDOA-UHFFFAOYSA-N 0.000 claims description 3
- GVEHJMMRQRRJPM-UHFFFAOYSA-N chromium(2+);methanidylidynechromium Chemical compound [Cr+2].[Cr]#[C-].[Cr]#[C-] GVEHJMMRQRRJPM-UHFFFAOYSA-N 0.000 claims description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 3
- 229910003468 tantalcarbide Inorganic materials 0.000 claims description 3
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 claims description 3
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- 229910003470 tongbaite Inorganic materials 0.000 claims description 3
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims description 3
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 3
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 3
- 229910052580 B4C Inorganic materials 0.000 claims description 2
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 2
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical group B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims 1
- 150000004649 carbonic acid derivatives Chemical group 0.000 claims 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims 1
- IDBFBDSKYCUNPW-UHFFFAOYSA-N lithium nitride Chemical compound [Li]N([Li])[Li] IDBFBDSKYCUNPW-UHFFFAOYSA-N 0.000 claims 1
- 229910052698 phosphorus Inorganic materials 0.000 claims 1
- 239000011574 phosphorus Substances 0.000 claims 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims 1
- YPMOSINXXHVZIL-UHFFFAOYSA-N sulfanylideneantimony Chemical compound [Sb]=S YPMOSINXXHVZIL-UHFFFAOYSA-N 0.000 claims 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims 1
- 239000013543 active substance Substances 0.000 abstract description 10
- 230000000052 comparative effect Effects 0.000 description 24
- 239000002033 PVDF binder Substances 0.000 description 19
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 19
- 239000006229 carbon black Substances 0.000 description 13
- 229910052782 aluminium Inorganic materials 0.000 description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 11
- 239000002245 particle Substances 0.000 description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 10
- 239000002002 slurry Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 8
- 239000007774 positive electrode material Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 239000011888 foil Substances 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- 239000004642 Polyimide Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229920001721 polyimide Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- SRKHSGMBYRQRSA-UHFFFAOYSA-N [Sb].S=O Chemical compound [Sb].S=O SRKHSGMBYRQRSA-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 2
- 229910021383 artificial graphite Inorganic materials 0.000 description 2
- AOPJVJYWEDDOBI-UHFFFAOYSA-N azanylidynephosphane Chemical compound P#N AOPJVJYWEDDOBI-UHFFFAOYSA-N 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008103 glucose Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 229920002239 polyacrylonitrile Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- BHZCMUVGYXEBMY-UHFFFAOYSA-N trilithium;azanide Chemical compound [Li+].[Li+].[Li+].[NH2-] BHZCMUVGYXEBMY-UHFFFAOYSA-N 0.000 description 2
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 1
- 229910015645 LiMn Inorganic materials 0.000 description 1
- 229910013716 LiNi Inorganic materials 0.000 description 1
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002134 carbon nanofiber Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 150000007942 carboxylates Chemical class 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 239000002931 mesocarbon microbead Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002153 silicon-carbon composite material Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Composite Materials (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a pole piece and a lithium ion battery. The first aspect of the invention provides a pole piece, which comprises a substrate, wherein the substrate comprises a current collector and a protective layer arranged on the surface of the current collector, an active substance layer is further arranged on the protective layer, the protective layer comprises, by mass, 62% -96% of inactive materials, 0.1% -8% of conductive agents and 3% -30% of binders, the inactive materials comprise inorganic particles and a carbon layer coated on the surface of the inorganic particles, and the mass of the carbon layer is less than 10% of the mass of the inorganic particles. The pole piece provided by the invention can solve the problem that the safety and the electrical property of the lithium ion battery cannot be considered.
Description
Technical Field
The invention relates to a pole piece and a lithium ion battery, and relates to the technical field of lithium ion batteries.
Background
The lithium ion battery has the advantages of high platform voltage, high energy density, no memory effect, long service life and the like, and is widely applied to the fields of smart phones, notebook computers, bluetooth, wearable equipment and the like. However, in some extreme cases, for example, when the lithium ion battery is mechanically damaged, such as needling, heavy impact, etc., an internal short circuit occurs, and a large amount of heat is released in a short time, so that the lithium ion battery is ignited and fails, and a great potential safety hazard exists.
The protection layer is arranged on the surface of the current collector to help to improve the safety of the lithium ion battery, but the electric performance of the lithium ion battery is reduced, so that more and more attention is paid to how to consider the safety and the electric performance of the lithium ion battery.
Disclosure of Invention
The invention provides a pole piece which is used for solving the problem that the safety and the electrical performance of a lithium ion battery cannot be considered.
The invention also provides a lithium ion battery which has better safety and electrical property.
The first aspect of the invention provides a pole piece, which comprises a substrate, wherein the substrate comprises a current collector and a protective layer arranged on the surface of the current collector, and an active material layer is further arranged on the protective layer;
The protective layer comprises, by mass, 62% -96% of an inactive material, 0.1% -8% of a conductive agent and 3% -30% of a binder, wherein the inactive material comprises inorganic particles and a carbon layer coated on the surfaces of the inorganic particles, and the mass of the carbon layer is less than 10% of the mass of the inorganic particles.
According to an embodiment of the invention, the mass of the carbon layer is 0.5% -5% of the mass of the inorganic particles.
According to an embodiment of the present invention, the inorganic particles comprise one or more of oxides, carbides, nitrides, inorganic salts.
According to an embodiment of the invention, the oxide is selected from one or more of aluminum oxide, titanium oxide, magnesium oxide, zirconium oxide, antimony oxysulfide, barium oxide, manganese oxide, silicon oxide, iron oxide, and three-iron-tetraoxide, the carbide comprises one or more of metal carbide and/or non-metal carbide, the non-metal carbide comprises one or more of titanium carbide, calcium carbide, chromium carbide, tantalum carbide, vanadium carbide, zirconium carbide, and tungsten carbide, the nitride comprises metal nitride and/or non-metal nitride, the metal nitride comprises one or more of lithium nitride, magnesium nitride, aluminum nitride, titanium nitride, and tantalum nitride, the non-metal nitride comprises at least one of boron nitride, phosphorus pentanitride, and three-silicon nitride, and the inorganic salt comprises carbonate and/or sulfate.
According to an embodiment of the invention, the thickness of the carbon layer is 1-100nm.
According to one embodiment of the invention, the non-active material has a D50 of 2 μm or less and a D90 of 5 μm or less.
According to an embodiment of the invention, the D50 of the inactive material is 0.05-0.5 μm and D90 is 1-3 μm.
According to one embodiment of the invention, the relation between D50 of the inactive material and the thickness H1 of the protective layer satisfies H1. Gtoreq.2XD50.
According to an embodiment of the present invention, the relationship between the thickness H1 of the protective layer and the thickness H2 of the active material layer satisfies H1/H2.ltoreq.1/5.
The second aspect of the invention provides a lithium ion battery comprising any one of the pole pieces.
The implementation of the invention has at least the following advantages:
1. The pole piece provided by the invention comprises the protective layer, and by controlling the mass fraction of each component in the protective layer and selecting the carbon-coated inorganic particles, the safety of the lithium ion battery can be effectively improved, particularly, when mechanical abuse occurs, the probability of ignition failure of the lithium ion battery is reduced, the through-pin test passing rate of the lithium ion battery is improved, the electric performance of the lithium ion battery is basically not affected, and the problem that the safety and the electric performance of the lithium ion battery cannot be both considered is solved.
2. The lithium ion battery provided by the invention has better safety and electrical property.
Drawings
FIG. 1 is a schematic view of a pole piece according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pole piece according to another embodiment of the present invention.
Reference numerals illustrate:
100-current collector;
200-a protective layer;
300-active material layer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The first aspect of the invention provides a pole piece, which comprises a substrate, wherein the substrate comprises a current collector and a protective layer arranged on the surface of the current collector, and an active material layer is further arranged on the protective layer;
The protective layer comprises, by mass, 62% -96% of an inactive material, 0.1% -8% of a conductive agent and 3% -30% of a binder, wherein the inactive material comprises inorganic particles and a carbon layer coated on the surfaces of the inorganic particles, and the mass of the carbon layer is less than 10% of the mass of the inorganic particles.
The invention provides a pole piece, which comprises a substrate, the substrate comprises a current collector and a protective layer arranged on the surface of the current collector, an active substance layer 300 is arranged on the protective layer, for example, fig. 1 is a schematic structural diagram of the pole piece provided by an embodiment of the invention, fig. 2 is a schematic structural diagram of the pole piece provided by another embodiment of the invention, as shown in fig. 1-2, the current collector 100 is a base metal for attaching other materials such as protective layer materials and active substances in the pole piece, the base metal comprises two surfaces for attaching other materials such as protective layer materials and active substances, specifically an upper surface and a lower surface, the protective layer 200 is arranged on the upper surface of the current collector 100, the length of the active substance layer 300 can be larger than, equal to or smaller than the length of the protective layer 200, namely, the active substance layer 300 can be arranged on the upper surface (such as fig. 1) of the protective layer 200 far away from the current collector 100, or can be divided into two parts, the first part of the active substance layer 300 is arranged on the upper surface of the protective layer 200 far away from the current collector, the second part of the active substance layer 300 is arranged on the upper surface of the protective layer (such as the upper surface of the protective layer 2 is not arranged on the upper surface of the current collector 100), and the other active substance layer 300 is arranged on the upper surface of the current collector 100 or the current collector can be arranged on the surface of the current collector at least in a different mode than the surface of the current collector 100, at least one of the surface of the current collector, and the current collector can be further arranged on the surface of the current collector, according to the invention, at least the invention, and the invention, the active substance layer can be further needs can be arranged on the surface, and the surface can be at the surface, and the surface is at the surface according to the surface, and the surface is at the surface is different to the need.
In order to ensure that the electrical performance of the lithium ion battery is basically not affected, the invention selects the inactive material as the main component of the protective layer, wherein the inactive material is the material which does not participate in electrochemical reaction (opposite to the function of the active material layer of the pole piece), can reduce the influence of the protective layer on the cycle stability of the lithium ion battery and give consideration to the electrical performance of the lithium ion battery, the inactive material is the main component of the protective layer 200, and also plays a role of supporting the protective layer, when the content of the inactive material is too low, the structural stability of the protective layer is poor, the active material layer is affected to damage in the subsequent coating process of the active material layer, or the protective layer is stressed to be scattered in the pole piece rolling process, so that the mass percent of the inactive material is not lower than 62%, and it can be understood that the protective layer 200 comprises a binder and a conductive agent in addition to the inactive material, the binder is used for protecting the inactive material, The conductive agent can be used for constructing an electronic conductive network, particularly, when the protective layer is positioned between the current collector and the active material layer, the conductive agent can be used as an electronic path for connecting the current collector and the active material layer, thereby facilitating the function of the current collector, improving the performance of the pole piece, and the like, if the content of the conductive agent is too low, the conductive agent can not play a role in bonding, is unfavorable for the good adhesion of the protective layer on the current collector, and when the content of the conductive agent is too high, the pole piece becomes fragile, the compaction density is reduced, and the energy density of the lithium ion battery is influenced 0.1 to 8 percent of conductive agent and 3 to 30 percent of binder, namely the total mass of the protective layer is taken as 100 percent, the mass of inactive materials is 62 to 96 percent of the total mass of the protective layer, and the mass of the conductive agent is 0.1 to 8 percent of the total mass of the protective layer, The mass of the binder is 3% -30% of the total mass of the protective layer, meanwhile, the inventor finds that the conductive network constructed by the conductive agent is not capable of effectively ensuring the conductivity of the protective layer, in order to ensure that the electrical performance of the lithium ion battery is not affected, the carbon-coated inorganic particles are selected as the inactive materials, the carbon layer coated on the surfaces of the inorganic particles enables the inorganic particles to have conductivity, the conductive agent in the protective layer is matched with the conductive agent to construct a more comprehensive conductive network, the problem of partial conductivity deficiency caused by nonuniform conductive agent respectively is avoided, the conductivity of the protective layer is improved, the electrical performance of the lithium ion battery is ensured, and it is understood that the conductivity of the inactive materials is improved along with the improvement of the carbon coating amount, but the excessively high carbon coating amount is not beneficial to the safety performance of the battery, and in order to ensure the safety and the electrical performance of the lithium ion battery, the mass of the carbon layer is less than 10% of the inorganic particles, and the carbon coating technology is a conventional technology in the field. The pole piece provided by the invention comprises the protective layer, and by controlling the mass fraction of each component in the protective layer and selecting the carbon-coated inorganic particles, the safety of the lithium ion battery can be effectively improved, particularly, when mechanical abuse occurs, the probability of ignition failure of the lithium ion battery is reduced, the through-pin test passing rate of the lithium ion battery is improved, the electric performance of the lithium ion battery is basically not affected, and the problem that the safety and the electric performance of the lithium ion battery cannot be both considered is solved.
In order to further consider the safety and the electrical performance of the lithium ion battery, the mass of the carbon layer is 0.5-5% of the mass of the inorganic particles.
In some embodiments, the inorganic particles comprise one or more of an oxide, carbide, nitride, inorganic salt;
Further, the oxide is at least one selected from the group consisting of aluminum oxide, titanium oxide, magnesium oxide, zirconium oxide, antimony oxysulfide, barium oxide, manganese oxide, silicon oxide, iron oxide, and ferric oxide, the carbide comprises at least one of a metal carbide and/or a non-metal carbide, the metal carbide comprises at least one of titanium carbide, calcium carbide, chromium carbide, tantalum carbide, vanadium carbide, zirconium carbide, and tungsten carbide, the non-metal carbide comprises boron carbide and/or silicon carbide, the nitride comprises at least one of a metal nitride and/or a non-metal nitride, the metal nitride comprises at least one of lithium nitride, magnesium nitride, aluminum nitride, titanium nitride, and tantalum nitride, the non-metal nitride comprises at least one of boron nitride, phosphorus pentanitride, and silicon tetranitride, and the inorganic salt comprises a carbonate and/or a sulfate.
The material of the carbon layer and the coating method may be performed according to conventional techniques in the art, for example, mixing the inorganic particles with a glucose solution, performing a hydrothermal treatment at a high temperature (150-200 ℃) for a period of time (2-5 hours), and then performing high temperature (600-800 ℃) carbonization under an inert gas atmosphere to obtain carbon-coated inorganic particles.
The ratio of inorganic particles to glucose can be reasonably chosen by the skilled person to ensure that the mass of the carbon layer is less than 10% of the mass of the inorganic particles, in one embodiment the carbon layer has a thickness of 1-100nm.
According to the research, when at least two layers of inactive materials exist in the protective layer on the plane perpendicular to the current collector, the protective effect of the protective layer is further improved, therefore, the relation between the D50 of the inactive materials and the thickness H1 of the protective layer meets that H1 is more than or equal to 2 xD 50, D50 is the particle size of the inactive materials which is 50% accumulated in volume from the small particle size side in the particle size distribution of volume basis, the thickness H1 of the protective layer is the distance value from the surface of the current collector provided with the protective layer to the surface of the protective layer far away from the current collector in the direction perpendicular to the current collector, and when the two layers meet that H1 is more than or equal to 2 xD 50, at least two inactive materials are evenly distributed on the protective layer in the thickness direction (the direction perpendicular to the surface of the current collector) of the protective layer, and the protective effect of the protective layer is equivalent to that the inactive materials are at least two layers on the plane perpendicular to the current collector, and the safety of the lithium ion battery is improved.
In order to further improve the safety of the lithium ion battery, an inactive material with small particle size, specifically, the D50 of the inactive material is less than or equal to 2 mu m, the D90 of the inactive material is less than or equal to 5 mu m, the inactive material with the particle size range is not easy to fall off from the surface of a current collector in the nailing process, the stability and the safety of the pole piece are further improved, and the D50 of the inactive material is 0.05-0.5 mu m, and the D90 of the inactive material is 1-3 mu m. D50 is a particle diameter of the inactive material from the small particle diameter side to a volume accumulation of 50% in the volume-based particle diameter distribution, and D90 is a particle diameter of the inactive material from the small particle diameter side to a volume accumulation of 90% in the volume-based particle diameter distribution.
The binder and the conductive agent in the protective layer may be conventional materials in the art, for example, the binder includes one or more of polyvinylidene fluoride (PVDF), carboxylic acid modified polyvinylidene fluoride (PVDF), polymethyl methacrylate (PMMA), polyacrylonitrile (PAN), polyacrylate, polyimide (PI), wherein the carboxylic acid modified PVDF includes one or more of acrylic acid modified PVDF, the conductive agent includes one or more of conductive carbon black, acetylene black, graphite, graphene, carbon nanotubes, and carbon nanofibers, and a suitable material may be selected by a person skilled in the art, and mixed with an inactive material to obtain a protective layer slurry, and coated on the surface of a current collector, and dried to obtain the protective layer.
The active material layer includes an active material for performing an electrochemical reaction, and provides capacity for the lithium ion battery, but the protective layer itself does not provide capacity, but rather increases the weight and volume of the lithium ion battery, and causes a loss in energy density of the lithium ion battery, so as to further avoid the influence of the protective layer on the energy density of the lithium ion battery, the thickness H1 of the protective layer should be controlled at a lower level than the thickness H2 of the active material layer, and specifically, the relation between the thickness H1 of the protective layer and the thickness H2 of the active material layer satisfies that H1/H2 is less than or equal to 1/5.
In the invention, the pole piece can be a positive pole piece or a negative pole piece, when the pole piece is a positive pole piece, the pole piece comprises a positive pole current collector, a protective layer and a positive pole active material layer, when the pole piece is a negative pole piece, the pole piece comprises a negative pole current collector, the protective layer and the negative pole active material layer, wherein the positive pole current collector can be an aluminum foil which is formed by taking aluminum as a main component, or a composite current collector which is formed by laminating the aluminum foil and other materials (such as polymer materials, etc.), or a composite current collector which comprises the aluminum foil and a conductive carbon layer coated on the surface of the aluminum foil, etc., the mass content of the aluminum in the aluminum foil is generally not lower than 95%, and the negative pole current collector can be a copper foil or a nickel foil.
When the above-mentioned electrode sheet is a positive electrode sheet, the active material in the positive electrode active material layer is a positive electrode active material, for example, a positive electrode active material that provides lithium ions, specifically includes a lithium positive electrode composite metal oxide (i.e., lithium-containing inorganic material), and includes at least one of lithium cobaltate (LiCoO 2), lithium nickelate (LiNiO 2), lithium manganate (LiMn 2O4), lithium iron phosphate (LiFePO 4), and ternary material, and the chemical formula of the ternary material may be LiNi xCoyMnzO2, x+y+z=1. When the electrode sheet is a negative electrode sheet, the active material therein is a negative electrode active material, and the negative electrode active material may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, mesophase Carbon Microspheres (MCMB), silicon-carbon composite, silicon oxide, lithium titanate, and lithium metal.
The active material layer further includes a binder and a conductive agent which function the same as the binder and the conductive agent in the protective layer, and the binder and the conductive agent may be the same or different from each other as described above.
In addition, when the electrode sheet is an anode sheet, the anode active material layer may further include a dispersing agent including sodium carboxymethyl cellulose or the like.
It is found that when the lithium ion battery is internally shorted, multiple short circuit modes exist, and the internal short circuit caused by the contact of the positive current collector and the negative plate is the most dangerous mode, so that the pole piece can be the positive plate, namely, the protective layer is arranged on the surface of the positive current collector, and the negative plate is not provided with the protective layer.
The pole piece provided by the invention further comprises a pole lug, and the setting position of the pole lug can be a conventional pole lug setting position in the field, for example, the pole piece can be arranged at the end part or the middle part of the pole piece. When the pole piece is a positive pole piece, the positive pole lug can be aluminum foil, and when the pole piece is a negative pole piece, the negative pole lug can be nickel foil.
The pole piece provided by the invention can be prepared by a conventional method in the field such as a coating method, and the like, and in the specific implementation, the raw materials of the protective layer are dispersed in a solvent, the raw materials are uniformly stirred to prepare protective layer slurry, the protective layer slurry is coated on the surface of a current collector, the protective layer is formed after drying, the raw materials of the active material layer are dispersed in the solvent, the active material layer slurry is uniformly stirred to prepare the active material layer slurry, the active material layer slurry is coated on the surface of the protective layer far away from the current collector or the area of the surface of the current collector, which is not provided with the protective layer, the active material layer is formed after the working procedures such as drying, rolling and the like, and then the pole ear is coated on the surface of the current collector, so as to obtain the pole piece.
In summary, the pole piece provided by the invention comprises the protective layer, and by controlling the mass fraction of each component in the protective layer and selecting the carbon-coated inorganic particles, the safety of the lithium ion battery can be effectively improved, especially when mechanical abuse occurs, the probability of ignition failure of the lithium ion battery is reduced, the penetrating nail test passing rate of the lithium ion battery is improved, the electrical performance of the lithium ion battery is basically not affected, and the problem that the safety and the electrical performance of the lithium ion battery cannot be considered is solved.
The second aspect of the invention provides a lithium ion battery comprising any one of the pole pieces.
The invention provides a lithium ion battery, which comprises a pole piece provided by the first aspect of the invention, when the pole piece is a positive pole piece, the pole piece can be prepared by adopting a conventional technical means together with a conventional negative pole piece, a diaphragm and electrolyte, wherein the diaphragm comprises one or more of Polyethylene (PE), polypropylene (PP) and polyimide, the electrolyte comprises carbonate, carboxylate solvents, lithium salt and proper additives, in the preparation process, the positive pole piece, the negative pole piece and an isolating film are wound or stacked in sequence to form a battery core, and then a packaging material such as an aluminum plastic film is used for packaging the battery core and injecting the electrolyte, and the battery core is prepared into the lithium ion battery through charge and discharge. The lithium ion battery provided by the invention has better safety and electrical property.
The invention is further illustrated by the following examples:
Example 1
The pole piece that this embodiment provided is the positive pole piece, including the current collector aluminium foil, be located the protective layer on current collector surface, be located the protective layer and keep away from the positive pole active material layer on current collector surface, wherein:
The protective layer comprises 62 parts by mass of an inactive material, 30 parts by mass of acrylic modified PVDF and 8 parts by mass of carbon black, wherein the inactive material is carbon-coated alumina, the mass of the carbon layer is 0.5% of the mass of the alumina, D10 of the inactive material is 0.02 mu m, D50 is 0.3 mu m, D90 is 2 mu m, and the thickness H1 of the protective layer is 2 mu m;
The positive electrode active material layer includes 96 parts by mass of positive electrode active material LCO, 2 parts by mass of binder PVDF and 2 parts by mass of conductive agent carbon black, and the thickness H2 of the positive electrode active material layer is 40 μm.
The preparation method of the pole piece comprises the steps of mixing alumina, acrylic acid modified PVDF and carbon black according to a certain mass portion, dispersing the mixture in a solvent NMP, stirring uniformly to obtain protective layer slurry, coating the protective layer slurry on the surface of an aluminum foil, drying to obtain a protective layer, mixing LCO, PVDF and carbon black according to a certain mass portion, dispersing the mixture in the solvent NMP, stirring uniformly to obtain positive electrode active material layer slurry, coating the surface of the protective layer, far away from a current collector, drying to obtain a positive electrode active material layer, and rolling to obtain the positive electrode piece.
Example 2
The pole piece provided in this embodiment can refer to embodiment 1, except that the protective layer includes 70 parts by mass of the inactive material, 25 parts by mass of the acrylic-modified PVDF, and 5 parts by mass of the carbon black.
Example 3
The pole piece provided in this embodiment can refer to embodiment 1, except that the protective layer includes 80 parts by mass of the inactive material, 15 parts by mass of the acrylic-modified PVDF, and 5 parts by mass of the carbon black.
Example 4
The pole piece provided in this embodiment can refer to embodiment 1, except that the protective layer includes 90 parts by mass of the inactive material, 8 parts by mass of the acrylic-modified PVDF, and 2 parts by mass of the carbon black.
Example 5
The pole piece provided in this example can refer to example 1, except that the protective layer includes 96 parts by mass of the inactive material, 3.9 parts by mass of the acrylic-modified PVDF, and 0.1 part by mass of the carbon black.
Example 6
The pole piece provided in this example can refer to example 1, except that the protective layer includes 96 parts by mass of the inactive material, 3 parts by mass of the acrylic-modified PVDF, and 1 part by mass of the carbon black.
Example 7
The pole piece provided in this embodiment can refer to embodiment 4, except that the mass of the carbon layer in the inactive material is 1% of the mass of the alumina.
Example 8
The pole piece provided in this embodiment can refer to embodiment 4, except that the mass of the carbon layer in the inactive material is 2% of the mass of the alumina.
Example 9
The pole piece provided in this embodiment can refer to embodiment 4, except that the mass of the carbon layer in the inactive material is 3% of the mass of alumina.
Example 10
The pole piece provided in this embodiment can refer to embodiment 4, except that the mass of the carbon layer in the inactive material is 4% of the mass of alumina.
Example 11
The pole piece provided in this embodiment can refer to embodiment 4, except that the mass of the carbon layer in the inactive material is 5% of the mass of the alumina.
Comparative example 1
The pole piece provided in this comparative example can be referred to example 1, except that the protective layer includes 50 parts by mass of the inactive material, 45 parts by mass of the acrylic-modified PVDF, and 5 parts by mass of the carbon black.
Comparative example 2
The pole piece provided in this comparative example can be referred to example 1, except that the protective layer includes 62 parts by mass of the inactive material, 20 parts by mass of the acrylic-modified PVDF, and 18 parts by mass of the carbon black.
Comparative example 3
The pole piece provided in this comparative example can be referred to example 1, except that the protective layer includes 92 parts by mass of the inactive material, 2 parts by mass of the acrylic-modified PVDF, and 6 parts by mass of the carbon black.
Comparative example 4
The pole piece provided in this comparative example can refer to example 1, except that the protective layer includes 92 parts by mass of the inactive material and 8 parts by mass of the acrylic-modified PVDF.
Comparative example 5
The pole piece provided in this comparative example does not include a protective layer.
Comparative example 6
The pole piece provided in this comparative example can be referred to example 4, except that the inactive material is alumina.
Comparative example 7
The comparative example provides a pole piece with reference to example 4, except that the mass of the carbon layer in the inactive material is 10% of the mass of alumina.
The positive electrode sheets provided in examples 1-11 and comparative examples 1-7 are matched with a negative electrode sheet and a diaphragm to prepare a bare cell, the bare cell is packaged by an aluminum plastic film, a certain amount of electrolyte is injected, sealing is carried out, and the lithium ion battery is prepared through formation, wherein the negative electrode sheet comprises a negative electrode current collector copper foil and a negative electrode active layer, and the negative electrode active layer comprises 96 parts by mass of artificial graphite, 1.5 parts by mass of styrene-butadiene rubber, 1.5 parts by mass of sodium carboxymethyl cellulose and 1 part by mass of carbon black.
The lithium ion batteries provided in examples 1 to 11 and comparative examples 1 to 7 were then tested for safety and electrical properties, and the test results are shown in table 1, and the test methods are as follows:
(1) Penetration test
10 Lithium ion batteries of each example (comparative example) are taken, the full-charge batteries are placed on a penetrating nail test device, the device is started, nails (with the diameter of 3 mm) are perpendicular to the plane of the batteries at the speed of 130mm/s to penetrate into the center position of the batteries, the batteries are stopped for 10 minutes and then withdrawn, the batteries are regarded as passing without firing, and the number of the passing lithium ion batteries is counted.
(2) Rate capability test
The battery was discharged to 3.0V at a rate of 0.5C, and after standing for 5min, the battery was charged to the upper limit voltage at a rate of 0.5C, and then charged at a constant voltage, with a cut-off current of 0.02C. After standing for 5min, the battery was discharged to 3.0V at a rate of 0.2C, and the capacity was C0. After standing for 5min, the battery was charged to the upper limit voltage at a rate of 0.5C, then charged at a constant voltage, and the current was cut off at 0.02C. After standing for 5min, the battery was discharged to 3.0V at a rate of 0.5C, and the capacity was C1. The C1/C0 is the discharge capacity ratio of 0.5C/0.2C, and is used for evaluating the multiplying power discharge capacity.
(3) Lithium ion battery energy density testing
The energy density ed=e/V of the lithium ion battery, where E is the discharge energy of the battery, the test method is to fully charge the battery, then discharge the battery at 0.2C to 3.0V, and the discharge energy is E. V is the volume of the cell, obtained by measuring the length, width, height.
The energy density loss rate Δed is the difference between the energy density ED 5 of the lithium ion battery of comparative example 5 and the energy density ED n of the lithium ion battery of the corresponding example (comparative example)/the energy density ED 5 of the lithium ion battery of comparative example 5, i.e., Δed= (ED 5-EDn)/ED5).
TABLE 1
The provision of the protective layer contributes to improvement of safety of the lithium ion battery, but has different degree of loss of energy density, as compared with the data provided in comparative example 5, it is known from the data provided in examples 1 to 6 and comparative examples 1 to 4 that controlling mass fractions of each component in the protective layer within the range provided by the present invention contributes to compromise of safety and electric properties of the lithium ion battery, and it is known from the data provided in examples 7 to 11 and comparative example 6 that the use of carbon-coated inorganic particles contributes to improvement of rate performance of the lithium ion battery, and that the safety performance of the lithium ion battery is significantly reduced after the carbon-coated amount of the surface of the inorganic particles exceeds 10% as compared with the data provided in examples 7 to 11 and comparative example 7.
It should be noted that the above embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.
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| WO2023184234A1 (en) * | 2022-03-30 | 2023-10-05 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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| CN203218375U (en) * | 2013-04-19 | 2013-09-25 | 宁德新能源科技有限公司 | Lithium ion battery pole piece and lithium ion battery |
| CN109755468A (en) * | 2017-11-08 | 2019-05-14 | 宁德时代新能源科技股份有限公司 | Electrode pole piece, electrochemical device and safety coating |
| CN109755463A (en) * | 2017-11-08 | 2019-05-14 | 宁德时代新能源科技股份有限公司 | Electrode pole piece, electrochemical device and safety coating |
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| JP6602130B2 (en) * | 2014-12-26 | 2019-11-06 | パナソニック株式会社 | Positive electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery |
| CN111200102B (en) * | 2018-11-16 | 2020-12-29 | 宁德时代新能源科技股份有限公司 | Positive pole piece and electrochemical device |
| CN111200110A (en) * | 2018-11-16 | 2020-05-26 | 宁德时代新能源科技股份有限公司 | Positive pole piece and electrochemical device |
| CN214411282U (en) * | 2021-04-09 | 2021-10-15 | 珠海冠宇电池股份有限公司 | Winding battery core and battery |
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| CN203218375U (en) * | 2013-04-19 | 2013-09-25 | 宁德新能源科技有限公司 | Lithium ion battery pole piece and lithium ion battery |
| CN109755468A (en) * | 2017-11-08 | 2019-05-14 | 宁德时代新能源科技股份有限公司 | Electrode pole piece, electrochemical device and safety coating |
| CN109755463A (en) * | 2017-11-08 | 2019-05-14 | 宁德时代新能源科技股份有限公司 | Electrode pole piece, electrochemical device and safety coating |
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