CN103682413A - High-rate long-cycle-life lithium iron phosphate battery and preparation method thereof - Google Patents
High-rate long-cycle-life lithium iron phosphate battery and preparation method thereof Download PDFInfo
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- CN103682413A CN103682413A CN201310732225.1A CN201310732225A CN103682413A CN 103682413 A CN103682413 A CN 103682413A CN 201310732225 A CN201310732225 A CN 201310732225A CN 103682413 A CN103682413 A CN 103682413A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title abstract description 8
- 239000006258 conductive agent Substances 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002931 mesocarbon microbead Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000011149 active material Substances 0.000 claims abstract description 9
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 9
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 9
- 239000006185 dispersion Substances 0.000 claims abstract description 7
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 5
- 239000004917 carbon fiber Substances 0.000 claims abstract description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 30
- 239000005955 Ferric phosphate Substances 0.000 claims description 23
- 229940032958 ferric phosphate Drugs 0.000 claims description 23
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 claims description 23
- 229910000399 iron(III) phosphate Inorganic materials 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 22
- 229910052493 LiFePO4 Inorganic materials 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 9
- 239000011230 binding agent Substances 0.000 claims description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000004513 sizing Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 230000004048 modification Effects 0.000 claims description 5
- 238000012986 modification Methods 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 238000009775 high-speed stirring Methods 0.000 abstract 1
- 239000006245 Carbon black Super-P Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 3
- 239000002134 carbon nanofiber Substances 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004500 asepsis Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 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
- 239000007772 electrode material Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- H01M4/139—Processes of manufacture
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- 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
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Abstract
The invention discloses a high-rate long-cycle-life lithium iron phosphate battery and a preparation method thereof. For cathode paste, lithium iron phosphate is used as the active material, and the mixture of conductive carbon black, KS-6 and a carbon nano tube is used as the conductive agent; for anode paste, mesocarbon microbeads are used as the active material and the mixture of conductive carbon black and conductive carbon fibers is used as the conductive agent. In the preparation method, a three-dimensional mixer and a high-speed stirring machine are used to achieve uniform dispersion of the pastes. A theoretical basis for solving the problems of low high-rate discharge capacity and safety of power batteries is provided, and the application field of the power batteries is broadened.
Description
Technical field
The present invention relates to a kind of lithium rechargeable battery manufacturing technology field, relate in particular to a kind of high magnification, long circulation life ferric phosphate lithium cell and preparation method thereof.
Background technology
Because LiFePO 4 material possesses that raw material sources is abundant, the plurality of advantages such as high, the Heat stability is good of environment-protecting asepsis, operating voltage, be considered to the desirable positive electrode of lithium ion battery of new generation.In recent years, lithium iron phosphate dynamic battery with its be perfectly safe reliably, overlength cycle life, the advantage such as discharge platform enjoys global lithium battery expert's favor stably, has obtained development rapidly.Can say that lithium iron phosphate dynamic battery has solved the security hidden trouble of cobalt acid lithium and lithium manganate battery completely, leads Chinese lithium battery industry to march toward the new epoch.Especially excellent cycle performance, the lithium ion battery traditional with other compared, and lithium iron phosphate dynamic battery 1C electric discharge is used and is reached 2000 times, and capability retention is not less than 80%.Electrokinetic cell is more and more higher to the requirement of high rate performance, cause LiFePO 4 material performance requirement to improve, grain refine is nanometer even, for meeting the instructions for use of electrokinetic cell, solve the problem of lithium ion battery high-multiplying power discharge, develop the ferric phosphate lithium cell of a kind of high-multiplying power discharge, long circulation life.
Summary of the invention
The object of this invention is to provide a kind of high magnification, long circulation life ferric phosphate lithium cell and preparation method thereof, for solution electrokinetic cell high-multiplying power discharge capacity is low and safety problem provides theoretical foundation, further widen the application of electrokinetic cell.
For achieving the above object, the technical solution used in the present invention is:
A kind of high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: the active material of anode sizing agent adopts LiFePO4, conductive agent is conductive carbon black, electrically conductive graphite, carbon nanotube mixture, the active material of cathode size adopts carbonaceous mesophase spherules, and conductive agent is conductive carbon black, conductive carbon fibre mixture.
According to described high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: the percentage by weight of described anode sizing agent is LiFePO4 84～92wt% conductive agent 6～15wt%, binding agent 3～10wt%; Described cathode size proportioning is carbonaceous mesophase spherules 88～94wt%, conductive agent 4～10wt%, binding agent 3～8wt%.
According to described high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: what the grain shape of described LiFePO4 was disperse is spherical, particle diameter is 200～300nm, and specific area is 20～30m2/g.
According to described high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: the diameter of described carbon nano-tube is 42nm, length is 7.2 μ m.
According to described high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: described MCMB is through modification, and particle diameter is 11-16 μ m, and what grain shape was disperse is spherical.
According to described high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: described carbon fiber diameter is about 0.1 μ m, length is 6～8 μ m.
A kind of preparation method of described lithium battery, it is characterized in that: the method that adopts three-dimensional material mixer and homogenizer to combine realizes the dispersed of slurry, this three-dimensional material mixer speed of mainshaft is 10～30r/min, homogenizer low speed revolution rotating speed is 15～30r/min, high speed dispersion rotating speed is 1000～2500r/min, and vacuum degree is-0.08MPa～-0.1Mpa.
Advantageous effect of the present invention is: 1, utilize three-dimensional material mixer evenly to mix in advance both positive and negative polarity dry powder, shorten slurry mixing time, solve the homodisperse problem of difficulty of powder body material, improve the consistency of slurry.2, the battery that prepared by the present invention can be realized 30C electric discharge, and it is more than 90% that capability retention is rated capacity.3, the battery table that prepared by the present invention reveals excellent cycle performance, and the 10C discharge cycles life-span surpasses 550 times, and the 20C discharge cycles life-span is over 300 times.
Accompanying drawing explanation
Fig. 1 is the SEM Electronic Speculum figure of nano-scale lithium iron phosphate.
Fig. 2 is positive plate shape figure of the present invention.
Fig. 3 is negative plate shape figure of the present invention.
Fig. 4 is that 18650-1100mAh-3.3V battery is at 10C, 20C, 30C discharge curve.
Fig. 5 is that 18650-1100mAh-3.3V battery is at 10C, 20C cyclic curve figure.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
The present invention as Figure 1-5, a kind of high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: the active material of anode sizing agent adopts LiFePO4, conductive agent is conductive carbon black, electrically conductive graphite, carbon nanotube mixture, the active material of cathode size adopts carbonaceous mesophase spherules, and conductive agent is conductive carbon black, conductive carbon fibre mixture.According to described high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: the percentage by weight of described anode sizing agent is LiFePO4 84～92wt% conductive agent 6～15wt%, binding agent 3～10wt%; Described cathode size proportioning is carbonaceous mesophase spherules (MCMB) 88～94wt%, conductive agent 4～10wt%, binding agent 3～8wt%.According to described high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: what the grain shape of described LiFePO4 was disperse is spherical, particle diameter is 200～300nm, and specific area is 20～30m
2/ g.According to described high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: the diameter of described carbon nano-tube is 42nm, length is 7.2 μ m.According to described high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: described MCMB is through modification, and particle diameter is 11-16 μ m, and what grain shape was disperse is spherical.According to described high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: described carbon fiber diameter is about 0.1 μ m, length is 6～8 μ m.The preparation method of lithium battery described in a kind of claim 1-6, it is characterized in that: the method that adopts three-dimensional material mixer and homogenizer to combine realizes the dispersed of slurry, this three-dimensional material mixer speed of mainshaft is 10～30r/min, homogenizer low speed revolution rotating speed is 15～30r/min, high speed dispersion rotating speed is 1000～2500r/min, and vacuum degree is-0.08MPa～-0.1Mpa.
The preparation process of 18650-1100mAh-3.3V high-multiplying-power battery of take below illustrates as example, and as shown in Figure 1, the concrete preparation method of battery is as follows for the positive electrode that battery adopts:
Anodal each constituent mass ratio: LiFePO4:Super-P:KS-6:CNTS:PVDF5130:NMP=88:3:2:
2:5:122。First PVDF5130 is dissolved in NMP, stirs 4h, then will after LiFePO 4 material and conductive agent mixing, adopt the dispersed stirring of three-dimensional material mixer, the speed of mainshaft is 25r/min, and mixing time is 100min.The material mixing is joined in glue, high-speed stirred 5h disperses again, and low speed revolution rotating speed is 20r/min, and high speed dispersion rotating speed is 2000r/min, and vacuum degree is-0.08MPa.The slurry being stirred sieves and is coated with after vacuum froth breaking, and through super-dry, roll-in, cut and make positive plate, lug material is aluminium strip, and width is 6mm, and the quantity of lug is 2, and the profile of pole piece as shown in Figure 2.
Each constituent mass ratio: MCMB:Super-P:VGCF:CMC:SBR:H2O=92:2:2:1.5:2.5 of negative pole:
130。First CMC is dissolved in the water, stir 2～3h, then will after MCMB and conductive agent mixing, adopt the dispersed stirring of three-dimensional material mixer, the speed of mainshaft is 20r/min, and mixing time is 80min, then the material mixing is joined in glue, high-speed stirred 3h disperses, low speed revolution rotating speed is 15r/min, and high speed dispersion rotating speed is 1600r/min, and vacuum degree is-0.08MPa.The slurry being stirred sieves and is coated with after vacuum froth breaking, and through super-dry, roll-in, cut and make negative plate, lug material is copper nickel composite band, and width is 5mm, and the quantity of lug is 3, and the profile of pole piece as shown in Figure 3.
The positive/negative plate preparing is joined to membrane coil and be coiled into cylindrical 18650 battery cores, toast 72h after entering shell, then assemble, detect.In assembling process, under inert gas shielding, carry out, electrolyte adopts LiPF6 organic solvent system, and reservoir quantity is 6.2g, and barrier film adopts individual layer PE structure, and thickness is 20 μ m.
The battery size of preparation is 18650-1100mAh-3.3V, and as shown in Figure 4,30C discharge capacitance is rated capacity to its high-rate discharge ability 90%.As shown in Figure 5, the 10C discharge cycles life-span surpasses 500 times cycle performance, and the 20C discharge cycles life-span is over 300 times.
A kind of high magnification, long circulation life ferric phosphate lithium cell and preparation method thereof, positive active material adopts LiFePO4, conductive agent is conductive carbon black (Super-P), electrically conductive graphite (KS-6), carbon nano-tube (CNTS) mixture, negative electrode active material adopts the carbonaceous mesophase spherules (MCMB) of modification, conductive agent is conductive carbon black (Super-P), conductive carbon fibre (VGCF) mixture, utilizes three-dimensional material mixer and homogenizer to prepare slurry.This lithium iron phosphate particles pattern comparison rule, spherical for disperse, particle diameter is 200～300nm, and specific area is 20～30m2/g, and the spherical structure of this rule is conducive to improve the volumetric specific energy of positive electrode.This carbon nano-tube (CNTS) diameter is 42nm, and length is 7.2 μ m, can be filled between active material particle and form continuous conductive network after adding, and improves the conductivity of electrode material.This MCMB is through modification, and particle diameter is 11-16 μ m, presents regular spherical structure, and this is not only conducive to improve the volumetric specific energy of negative material, and lithium ion can spread towards all directions, improves the high-rate discharge capacity of material.This carbon fiber (VGCF) diameter is about 0.1 μ m, and length is 6～8 μ m, adds rear easy formation space conductive network, improves the conductivity of electrode.The method that adopts three-dimensional material mixer and homogenizer to combine realizes the dispersed of slurry, this three-dimensional material mixer speed of mainshaft is 10～30r/min, homogenizer low speed revolution rotating speed is 15～30r/min, high speed dispersion rotating speed is 1000～2500r/min, and vacuum degree is-0.08MPa～-0.1MPa.Anode sizing agent proportioning is LiFePO4 84～92wt%, conductive agent 6～15wt%, binding agent 3～10wt%.Cathode size proportioning is carbonaceous mesophase spherules (MCMB) 88～94wt%, conductive agent 4～10wt%, binding agent 3～8wt%.
Claims (7)
1. a high magnification, long circulation life ferric phosphate lithium cell, it is characterized in that: the active material of anode sizing agent adopts LiFePO4, conductive agent is conductive carbon black, electrically conductive graphite, carbon nanotube mixture, the active material of cathode size adopts carbonaceous mesophase spherules, and conductive agent is conductive carbon black, conductive carbon fibre mixture.
2. high magnification according to claim 1, long circulation life ferric phosphate lithium cell, is characterized in that: the percentage by weight of described anode sizing agent is LiFePO4 84～92wt% conductive agent 6～15wt%, binding agent 3～10wt%; Described cathode size proportioning is carbonaceous mesophase spherules (MCMB) 88～94wt%, conductive agent 4～10wt%, binding agent 3～8wt%.
3. high magnification according to claim 1, long circulation life ferric phosphate lithium cell, is characterized in that: what the grain shape of described LiFePO4 was disperse is spherical, and particle diameter is 200～300nm, and specific area is 20～30m
2/ g.
4. high magnification according to claim 1, long circulation life ferric phosphate lithium cell, is characterized in that: the diameter of described carbon nano-tube is 42nm, and length is 7.2 μ m.
5. high magnification according to claim 1, long circulation life ferric phosphate lithium cell, is characterized in that: described MCMB is through modification, and particle diameter is 11-16 μ m, and what grain shape was disperse is spherical.
6. high magnification according to claim 1, long circulation life ferric phosphate lithium cell, is characterized in that: described carbon fiber diameter is about 0.1 μ m, and length is 6～8 μ m.
7. the preparation method of lithium battery described in a claim 1-6, it is characterized in that: the method that adopts three-dimensional material mixer and homogenizer to combine realizes the dispersed of slurry, this three-dimensional material mixer speed of mainshaft is 10～30r/min, homogenizer low speed revolution rotating speed is 15～30r/min, high speed dispersion rotating speed is 1000～2500r/min, and vacuum degree is-0.08MPa～-0.1Mpa.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600281A (en) * | 2014-12-30 | 2015-05-06 | 山东神工海特电子科技有限公司 | Preparation method of lithium manganate material and method for preparing battery from lithium manganate material |
| CN105514388A (en) * | 2016-01-08 | 2016-04-20 | 欧赛新能源科技股份有限公司 | Lithium ion positive pole material and mixing method |
| CN105591110A (en) * | 2015-12-18 | 2016-05-18 | 山东精工电子科技有限公司 | Preparation method of low-temperature lithium iron phosphate battery |
| CN106159265A (en) * | 2016-09-14 | 2016-11-23 | 成都雅骏新能源汽车科技股份有限公司 | The preparation method of the anode slurry of lithium iron phosphate battery of graphene-containing combined conductive agent |
| CN106784812A (en) * | 2016-11-21 | 2017-05-31 | 深圳市沃特玛电池有限公司 | A kind of preparation method of ferric phosphate lithium cell |
| CN106784656A (en) * | 2016-11-29 | 2017-05-31 | 常州普莱德新能源电池科技有限公司 | A kind of water system LiMn2O4 slurry and preparation method thereof |
| CN107768727A (en) * | 2017-10-13 | 2018-03-06 | 江苏海四达电源股份有限公司 | High temperature circulation lithium iron phosphate dynamic battery and its manufacture method |
| CN108258245A (en) * | 2018-01-03 | 2018-07-06 | 中航锂电（洛阳）有限公司 | A kind of combined conductive agent, lithium ion cell positive and lithium ion battery |
| CN111244456A (en) * | 2020-01-16 | 2020-06-05 | 东莞市沃泰通新能源有限公司 | High-rate lithium iron phosphate battery |
| CN111505502A (en) * | 2020-04-17 | 2020-08-07 | 北京航空航天大学 | Aging test method of lithium-ion battery under time-varying cycling conditions based on microscopic mechanism |
| CN112201841A (en) * | 2020-09-04 | 2021-01-08 | 东莞市沃泰通新能源有限公司 | Novel lithium iron phosphate cylindrical battery with high multiplying power or long cycle life and preparation method |
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