WO2022163512A1 - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
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- negative electrode
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- 239000011255 nonaqueous electrolyte Substances 0.000 title claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 100
- 238000004804 winding Methods 0.000 claims abstract description 70
- 239000007773 negative electrode material Substances 0.000 claims abstract description 20
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 45
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- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 8
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
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- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 3
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- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 description 2
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
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- QHIWVLPBUQWDMQ-UHFFFAOYSA-N butyl prop-2-enoate;methyl 2-methylprop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C(C)=C.CCCCOC(=O)C=C QHIWVLPBUQWDMQ-UHFFFAOYSA-N 0.000 description 2
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- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000003273 ketjen black Substances 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 229910021437 lithium-transition metal oxide Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910018871 CoO 2 Inorganic materials 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- 229910001357 Li2MPO4F Inorganic materials 0.000 description 1
- 229910013063 LiBF 4 Inorganic materials 0.000 description 1
- 229910001305 LiMPO4 Inorganic materials 0.000 description 1
- 229910002995 LiNi0.8Co0.15Al0.05O2 Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910017205 LixMn2 Inorganic materials 0.000 description 1
- 229910015329 LixMn2O4 Inorganic materials 0.000 description 1
- 229910014211 My O Inorganic materials 0.000 description 1
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- 230000001133 acceleration Effects 0.000 description 1
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- 150000002576 ketones Chemical class 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
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- 150000002739 metals Chemical class 0.000 description 1
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- AHIHJODVQGBOND-UHFFFAOYSA-N propan-2-yl hydrogen carbonate Chemical compound CC(C)OC(O)=O AHIHJODVQGBOND-UHFFFAOYSA-N 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
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- 229910052723 transition metal Inorganic materials 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Images
Classifications
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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
-
- 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
-
- 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
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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
- H01M4/134—Electrodes based on metals, Si or alloys
-
- 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
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
-
- 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
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- a negative electrode exposed portion 44 is provided over the entire length of the current collector in the width direction at the winding inner end portion in the longitudinal direction of the negative electrode 12 .
- the negative electrode exposed portion 44 is a portion to which the negative electrode lead 20 is connected, and is a portion where the surface of the negative electrode current collector 40 is not covered with the negative electrode mixture layer 42 .
- the negative electrode exposed portion 44 is formed to be wider in the longitudinal direction than the width of the negative electrode lead 20 .
- the negative electrode exposed portions 44 are preferably provided on both surfaces of the negative electrode 12 so as to overlap with each other in the thickness direction of the negative electrode 12 .
- the average fiber length of fibrous carbon is preferably 0.1 ⁇ m to 40 ⁇ m, more preferably 0.3 ⁇ m to 20 ⁇ m, and particularly preferably 0.5 ⁇ m to 5 ⁇ m.
- the average fiber length of fibrous carbon is calculated by measuring the length of 10 fibrous carbon fibers using a scanning electron microscope (hereinafter sometimes referred to as SEM) and calculating the average value thereof.
- SEM scanning electron microscope
- the length of fibrous carbon can be determined from a 50,000-fold SEM image (1024 ⁇ 1280 pixels) observed at an acceleration voltage of 5 kV.
- the diameter of the fibrous carbon may be, for example, 1 nm to 100 nm. The diameter of fibrous carbon is calculated from the average value of ten fibrous carbon fibers measured by SEM.
- binder contained in the negative electrode mixture layer 42 examples include styrene-butadiene rubber (SBR), nitrile-butadiene rubber (NBR), carboxymethylcellulose (CMC) or salts thereof, polyacrylic acid (PAA) or salts thereof ( PAA-Na, PAA-K, etc., and partially neutralized salts may also be used), polyvinyl alcohol (PVA), and the like.
- the binder may also contain fluorine-based resins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimide-based resins, acrylic-based resins, polyolefin-based resins, and the like. These may be used individually by 1 type, and may be used in combination of 2 or more types.
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
95質量部のLiNi0.8Co0.15Al0.05O2と、2.5質量部のアセチレンブラック(AB)と、2.5質量部の平均分子量が110万のポリフッ化ビニリデン(PVdF)とを混合し、N-メチル-2-ピロリドン(NMP)を適量加えて、固形分70質量%の正極合剤スラリーを調製した。次に、当該正極合剤スラリーをアルミニウム箔からなる帯状の正極集電体の両面に塗布、乾燥した後、圧延し、所定の極板サイズに切断して、正極集電体の両面に正極合剤層が形成された正極を作製した。正極の長手方向の略中央部に、合剤層が存在せず集電体表面が露出した正極露出部を設け、アルミニウム製の正極リードを正極露出部に溶接した。
負極活物質としては、平均粒子径(D50)が20μmの黒鉛と、D50が5μmのSiOを用いた。また、導電剤としては、直径が1.5nmで、長さが10μmの単層カーボンナノチューブ(SWCNT)を用いた。95質量部の黒鉛と、5質量部のSiOと、1質量部のSWCNTと、1質量部のカルボキシメチルセルロース(CMC)と、1質量部のスチレンブタジエンゴム(SBR)とを混合し、水を適量加えて、第1の負極合剤スラリーを調製した。また、95質量部の黒鉛と、5質量部のSiOと、1質量部のCMCと、1質量部のSBRとを混合し、水を適量加えて、第2の負極合剤スラリーを調製した。次に、第1の負極合剤スラリー及び第2の負極合剤スラリーを多層ダイコーターにセットして、銅箔からなる帯状の負極集電体の両面に同様に巻内端部から巻外端部にかけて、第1の負極合剤スラリーと第2の負極合剤スラリーの混合比を0:1から1:0まで連続的に変化させつつ塗布し、その後に塗膜を乾燥させた。ローラーを用いて乾燥した塗膜を圧延した後、所定の極板サイズに切断し、負極集電体の両面に負極合剤層が形成された正極を作製した。巻内端部に合剤層が存在せず集電体表面が露出した負極露出部を設け、ニッケル製の負極リードを負極露出部に溶接した。
エチレンカーボネート(EC)と、ジメチルメチルカーボネート(DMC)とからなる混合溶媒(体積比でEC:DMC=1:3)の100質量部に、ビニレンカーボネート(VC)を5質量部添加した。当該混合溶媒に1モル/Lの濃度になるようにLiPF6を溶解させて、電解質を調製した。
ポリエチレン製のセパレータを介して上記の正極及び負極を巻回して電極体を作製した。電極体の上下に絶縁板をそれぞれ配置し、電極体を円筒形の外装体に収容した。次いで、負極リードを外装体の底部に溶接するとともに、正極リードを封口体に溶接した。その後、外装体の内部に電解質を減圧方式により注入した後、外装体の開口端部を、ガスケットを介して封口体にかしめるように封口して、二次電池を作製した。作製した二次電池の容量は、2500mAhである。
負極の作製において、第1の負極合剤スラリーに含まれるSWCNTの量を0.2質量部としたこと以外は、実施例1と同様にして二次電池を作製した。
負極の作製において、第1の負極合剤スラリーに含まれるSWCNTの量を0.6質量部としたこと以外は、実施例1と同様にして二次電池を作製した。
負極の作製において、第1の負極合剤スラリーに含まれるSWCNTの量を2質量部としたこと以外は、実施例1と同様にして二次電池を作製した。
負極の作製において、第1の負極合剤スラリーと第2の負極合剤スラリーを混合せずに、第2の負極合剤スラリーのみを負極集電体の両面に塗布したこと以外は、実施例1と同様にして二次電池を作製した。
負極の作製において、95質量部の黒鉛と、5質量部のSiOと、0.5質量部のSWCNTと、1質量部のCMCと、1質量部のSBRとを混合し、水を適量加えて、第3の負極合剤スラリーを調製し、第3の負極合剤スラリーのみを負極集電体の両面に塗布した以外は、実施例1と同様にして二次電池を作製した。
負極の作製において、負極集電体の巻内端部から巻外端部にかけて、第1の負極合剤スラリーと第2の負極合剤スラリーの混合比を1:0から0:1まで連続的に変化させつつ塗布したこと以外は、実施例1と同様にして二次電池を作製した。
負極の作製において、第3の負極合剤スラリーに含まれるSWCNTの量を0.1質量部としたこと以外は、比較例2と同様にして二次電池を作製した。
負極の作製において、第3の負極合剤スラリーに含まれるSWCNTの量を0.3質量部としたこと以外は、比較例2と同様にして二次電池を作製した。
負極の作製において、第3の負極合剤スラリーに含まれるSWCNTの量を1質量部としたこと以外は、比較例2と同様にして二次電池を作製した。
実施例及び比較例の非水電解質二次電池を、環境温度25℃の下、1Cの定電流で、4.2Vまで充電した後、4.2Vの定電圧で、電流値が0.05Cになるまで充電した。20分間放置した後、0.5Cの定電流で、2.5Vまで放電した。この充放電を1サイクルとして、300サイクル行った。以下の式により、各実施例及び各比較例の非水電解質二次電池の充放電サイクルにおける容量維持率を求めた。
容量維持率=(300サイクル目の放電容量/1サイクル目の放電容量)×100
Claims (4)
- 帯状の正極及び帯状の負極がセパレータを介して巻回された電極体と、電解液と、前記電極体及び前記電解液を収容する外装体とを備える非水電解質二次電池であって、
前記負極は、負極集電体と、前記負極集電体の表面に形成され、負極活物質及び導電剤を含む負極合剤層と、を有し、
前記負極合剤層は、巻外端部における前記導電剤の含有率が、巻内端部における前記導電剤の含有率に比べて高く、巻内端部側から巻外端部側にかけて前記導電剤の含有率が連続的に増加する領域を有する、非水電解質二次電池。 - 巻外端部における前記導電剤の含有率は、前記負極活物質の質量に対して、0.1質量%~3質量%である、請求項1に記載の非水電解質二次電池。
- 前記導電剤は、繊維状炭素を含む、請求項1又は2に記載の非水電解質二次電池。
- 前記負極活物質は、炭素系材料とシリコン系材料とを含み、
前記負極活物質における前記シリコン系材料の含有率は、前記負極活物質の質量に対して3質量%以上である、請求項1~3のいずれか1項に記載の非水電解質二次電池。
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JP2011165388A (ja) | 2010-02-05 | 2011-08-25 | Panasonic Corp | リチウムイオン二次電池用電極、前記電極を用いたリチウムイオン二次電池用電極群、前記電極群を用いたリチウムイオン二次電池 |
JP2011210384A (ja) * | 2010-03-29 | 2011-10-20 | Panasonic Corp | 円筒型ニッケル水素蓄電池 |
JP2013191396A (ja) * | 2012-03-14 | 2013-09-26 | Hitachi Ltd | 非水電解質二次電池、非水電解質二次電池モジュール |
JP2015130298A (ja) * | 2014-01-08 | 2015-07-16 | トヨタ自動車株式会社 | 非水電解質二次電池 |
JP2017501546A (ja) * | 2013-12-24 | 2017-01-12 | イルジン エレクトリック カンパニー リミテッド | リチウム二次電池用負極板 |
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JP2011165388A (ja) | 2010-02-05 | 2011-08-25 | Panasonic Corp | リチウムイオン二次電池用電極、前記電極を用いたリチウムイオン二次電池用電極群、前記電極群を用いたリチウムイオン二次電池 |
JP2011210384A (ja) * | 2010-03-29 | 2011-10-20 | Panasonic Corp | 円筒型ニッケル水素蓄電池 |
JP2013191396A (ja) * | 2012-03-14 | 2013-09-26 | Hitachi Ltd | 非水電解質二次電池、非水電解質二次電池モジュール |
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JP2015130298A (ja) * | 2014-01-08 | 2015-07-16 | トヨタ自動車株式会社 | 非水電解質二次電池 |
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