JP2017016877A - リチウムイオン二次電池 - Google Patents
リチウムイオン二次電池 Download PDFInfo
- Publication number
- JP2017016877A JP2017016877A JP2015131990A JP2015131990A JP2017016877A JP 2017016877 A JP2017016877 A JP 2017016877A JP 2015131990 A JP2015131990 A JP 2015131990A JP 2015131990 A JP2015131990 A JP 2015131990A JP 2017016877 A JP2017016877 A JP 2017016877A
- Authority
- JP
- Japan
- Prior art keywords
- separator
- positive electrode
- negative electrode
- lithium ion
- active material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 30
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 28
- 239000011593 sulfur Substances 0.000 claims abstract description 28
- 239000003792 electrolyte Substances 0.000 claims abstract description 11
- 238000010248 power generation Methods 0.000 claims abstract description 11
- 239000010419 fine particle Substances 0.000 claims description 27
- 239000007774 positive electrode material Substances 0.000 claims description 23
- 239000007773 negative electrode material Substances 0.000 claims description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 229920005672 polyolefin resin Polymers 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 5
- 229910001593 boehmite Inorganic materials 0.000 claims description 4
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 4
- 239000011572 manganese Substances 0.000 claims description 4
- SOXUFMZTHZXOGC-UHFFFAOYSA-N [Li].[Mn].[Co].[Ni] Chemical compound [Li].[Mn].[Co].[Ni] SOXUFMZTHZXOGC-UHFFFAOYSA-N 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 5
- 239000006183 anode active material Substances 0.000 abstract 1
- 239000006182 cathode active material Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 62
- 239000000654 additive Substances 0.000 description 34
- 230000000996 additive effect Effects 0.000 description 24
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- -1 polyethylene Polymers 0.000 description 13
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- 239000000203 mixture Substances 0.000 description 10
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- 239000011230 binding agent Substances 0.000 description 8
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- 239000000919 ceramic Substances 0.000 description 6
- 239000002482 conductive additive Substances 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000002033 PVDF binder Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
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- 230000000694 effects Effects 0.000 description 4
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- 239000002184 metal Substances 0.000 description 4
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- 229920002857 polybutadiene Polymers 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
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- 239000002002 slurry Substances 0.000 description 4
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 3
- GWAOOGWHPITOEY-UHFFFAOYSA-N 1,5,2,4-dioxadithiane 2,2,4,4-tetraoxide Chemical compound O=S1(=O)CS(=O)(=O)OCO1 GWAOOGWHPITOEY-UHFFFAOYSA-N 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- 229910000873 Beta-alumina solid electrolyte Inorganic materials 0.000 description 2
- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical class C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- 125000004122 cyclic group Chemical group 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 2
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- 239000000230 xanthan gum Substances 0.000 description 2
- 229920001285 xanthan gum Polymers 0.000 description 2
- 235000010493 xanthan gum Nutrition 0.000 description 2
- 229940082509 xanthan gum Drugs 0.000 description 2
- RYIRMSRYCSMGJA-UHFFFAOYSA-N 1,5,2,4-dioxadithiepane 2,2,4,4-tetraoxide Chemical compound O=S1(=O)CS(=O)(=O)OCCO1 RYIRMSRYCSMGJA-UHFFFAOYSA-N 0.000 description 1
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- ZMYIIHDQURVDRB-UHFFFAOYSA-N 1-phenylethenylbenzene Chemical compound C=1C=CC=CC=1C(=C)C1=CC=CC=C1 ZMYIIHDQURVDRB-UHFFFAOYSA-N 0.000 description 1
- JPLNAQJTXYXDAV-UHFFFAOYSA-N 4,4,5-trichloro-1,3-dioxolan-2-one Chemical compound ClC1OC(=O)OC1(Cl)Cl JPLNAQJTXYXDAV-UHFFFAOYSA-N 0.000 description 1
- CRJXZTRTJWAKMU-UHFFFAOYSA-N 4,4,5-trifluoro-1,3-dioxolan-2-one Chemical compound FC1OC(=O)OC1(F)F CRJXZTRTJWAKMU-UHFFFAOYSA-N 0.000 description 1
- HIGQQEOWQNDHJD-UHFFFAOYSA-N 4,4-dichloro-1,3-dioxolan-2-one Chemical compound ClC1(Cl)COC(=O)O1 HIGQQEOWQNDHJD-UHFFFAOYSA-N 0.000 description 1
- DSMUTQTWFHVVGQ-UHFFFAOYSA-N 4,5-difluoro-1,3-dioxolan-2-one Chemical compound FC1OC(=O)OC1F DSMUTQTWFHVVGQ-UHFFFAOYSA-N 0.000 description 1
- OYOKPDLAMOMTEE-UHFFFAOYSA-N 4-chloro-1,3-dioxolan-2-one Chemical compound ClC1COC(=O)O1 OYOKPDLAMOMTEE-UHFFFAOYSA-N 0.000 description 1
- BJWMSGRKJIOCNR-UHFFFAOYSA-N 4-ethenyl-1,3-dioxolan-2-one Chemical compound C=CC1COC(=O)O1 BJWMSGRKJIOCNR-UHFFFAOYSA-N 0.000 description 1
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 1
- QIYMZTXOQUJMML-UHFFFAOYSA-N 4-methyl-1,3-dioxolan-2-one;2-methylprop-2-enoic acid Chemical compound CC(=C)C(O)=O.CC1COC(=O)O1 QIYMZTXOQUJMML-UHFFFAOYSA-N 0.000 description 1
- ABUUZDFXQZKHPA-UHFFFAOYSA-N 4-methyl-1,3-dioxolan-2-one;prop-2-enoic acid Chemical compound OC(=O)C=C.CC1COC(=O)O1 ABUUZDFXQZKHPA-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- 229910013063 LiBF 4 Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910015645 LiMn Inorganic materials 0.000 description 1
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 1
- 229910013872 LiPF Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 101150058243 Lipf gene Proteins 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 229910052586 apatite Inorganic materials 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- MGWIVXXTDAHZPB-UHFFFAOYSA-N benzenesulfonyloxymethyl benzenesulfonate Chemical compound C=1C=CC=CC=1S(=O)(=O)OCOS(=O)(=O)C1=CC=CC=C1 MGWIVXXTDAHZPB-UHFFFAOYSA-N 0.000 description 1
- UXXXZMDJQLPQPH-UHFFFAOYSA-N bis(2-methylpropyl) carbonate Chemical compound CC(C)COC(=O)OCC(C)C UXXXZMDJQLPQPH-UHFFFAOYSA-N 0.000 description 1
- 150000005678 chain carbonates Chemical class 0.000 description 1
- CKFRRHLHAJZIIN-UHFFFAOYSA-N cobalt lithium Chemical compound [Li].[Co] CKFRRHLHAJZIIN-UHFFFAOYSA-N 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- 150000005676 cyclic carbonates Chemical class 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- QLVWOKQMDLQXNN-UHFFFAOYSA-N dibutyl carbonate Chemical compound CCCCOC(=O)OCCCC QLVWOKQMDLQXNN-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
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- ODCCJTMPMUFERV-UHFFFAOYSA-N ditert-butyl carbonate Chemical compound CC(C)(C)OC(=O)OC(C)(C)C ODCCJTMPMUFERV-UHFFFAOYSA-N 0.000 description 1
- YFKFAKKXDBQSQF-UHFFFAOYSA-N ethylsulfonyloxymethyl ethanesulfonate Chemical compound CCS(=O)(=O)OCOS(=O)(=O)CC YFKFAKKXDBQSQF-UHFFFAOYSA-N 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 229920006015 heat resistant resin Polymers 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
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- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 229910021437 lithium-transition metal oxide Inorganic materials 0.000 description 1
- CJYZTOPVWURGAI-UHFFFAOYSA-N lithium;manganese;manganese(3+);oxygen(2-) Chemical compound [Li+].[O-2].[O-2].[O-2].[O-2].[Mn].[Mn+3] CJYZTOPVWURGAI-UHFFFAOYSA-N 0.000 description 1
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- PFPYHYZFFJJQFD-UHFFFAOYSA-N oxalic anhydride Chemical compound O=C1OC1=O PFPYHYZFFJJQFD-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 1
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 1
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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
- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
-
- 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
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- 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
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Abstract
Description
本発明は、電池の安全性を向上させつつ、容量維持率を維持することができるリチウムイオン電池を提供する。
負極活物質として、表面被覆天然黒鉛粉末、導電助剤としてカーボンブラック粉末、バインダー樹脂としてスチレンブタジエンラバー(SBR)とカルボキシメチルセルロース(CMC)とを、固形分質量比で93:3:2:2の割合でイオン交換水中に添加して撹拌し、これらの材料を水中に均一に分散させてスラリーを作製した。得られたスラリーを、負極集電体となる厚み10μmの銅箔上に塗布した。次いで、125℃にて10分間、電極を加熱し、水を蒸発させることにより負極活物質層を形成した。更に、負極活物質層をプレスすることによって、負極集電体の片面上に負極活物質層を塗布した負極を作製した。
正極活物質として、ニッケル・コバルト・マンガン酸リチウム(NCM811、すなわちニッケル:コバルト:マンガン=8:1:1)とリチウムマンガン酸化物(LiMn2O4)とを25:75(重量比)とを混合した混合酸化物と、導電助剤としてカーボンブラック粉末と、バインダー樹脂としてポリフッ化ビニリデンとを、固形分質量比で90:5:5の割合で、溶媒であるNMPに添加した。さらに、この混合物に有機系水分捕捉剤として無水シュウ酸(分子量90)を、上記混合物からNMPを除いた固形分100質量部に対して0.03質量部添加した上で撹拌することで、これらの材料を均一に分散させてスラリーを作製した。得られたスラリーを、正極集電体となる厚み20μmのアルミニウム箔上に塗布した。次いで、125℃にて10分間、電極を加熱し、NMPを蒸発させることにより正極活物質層を形成した。さらに、正極活物質層をプレスすることによって、正極集電体の片面上に目付20mg/cm2、密度3.0g/cm3の正極活物質層を塗布した正極を作製した。
耐熱微粒子としてアルミナを用いた厚さ5μmの耐熱微粒子層とポリプロピレンからなる厚さ20μmのオレフィン系樹脂層とから構成されるセラミックセパレータを使用した。耐熱微粒子層中に含有されるθ−アルミナの量の異なる複数のセラミックセパレータを用いた。用いたセパレータの種類は、表1に示す。なお実施例3では、厚さ25μmのポリプロピレン単層セパレータを使用した。
エチレンカーボネート(以下、「EC」と称する。)とDECとを、EC:DEC=30:70(体積比)の割合で混合した非水溶媒に、電解質塩としての六フッ化リン酸リチウム(LiPF6)を濃度が1.0mol/Lとなるように溶解させたものに対して、添加剤として環状ジスルホン酸エステル(メチレンメタンジスルホンネート(MMDS)とビニレンカーボネート(VC)とをそれぞれ濃度が1重量%となるように溶解させたものを用いた。
上記のように作製した各負極板と正極板を、各々所定サイズの矩形に切り出した。このうち、端子を接続するための未塗布部にアルミニウム製の正極リード端子を超音波溶接した。同様に、正極リード端子と同サイズのニッケル製の負極リード端子を負極板における未塗布部に超音波溶接した。セパレータの両面に上記負極板と正極板とを両活物質層がセパレータを隔てて重なるように配置して電極板積層体を得た。2枚のアルミニウムラミネートフィルムの長辺の一方を除いて三辺を熱融着により接着して袋状のラミネート外装体を作製した。ラミネート外装体に上記電極積層体を挿入した。電解液を注液して真空含浸させた後、減圧下にて開口部を熱融着により封止することによって、積層型リチウムイオン電池を得た。この積層型リチウムイオン電池について初期充放電を行った後、高温エージングを行い、電池容量5Ahの積層型リチウムイオン電池を得た。
電池の残容量(以下、「SOC」と称する。)0%から100%まで、雰囲気温度55℃で、初期充放電を行った。充放電の条件は、以下の通りである:0.1C電流で4.1Vまで定電流充電(CC充電)、その後4.1Vで定電圧充電(CV充電)し、次いで0.1C電流での定電流放電(CC放電)を、2.5Vまで行う。
リチウムイオン二次電池の初期充放電を行った後、電池を解体し、高周波誘導結合プラズマ発光分光分析法(ICP発光分光分析法)により、セパレータの硫黄含有量を測定した。
作成した電池に対して次の条件でサイクル試験を行った。作製した電池のSOC0%と100%までの間で、1C電流、4.15Vでの定電流定電圧充電(CCCV充電)と、1C電流での定電流放電(CC放電)を、55℃環境下で300回繰り返した。これによる容量維持率を、(300回サイクル後の電池容量)/(初期電池容量)なる計算式で計算した。
11 負極集電体
12 正極集電体
13 負極活物質層
15 正極活物質層
17 セパレータ
25 負極リード
27 正極リード
29 外装体
31 電解液
Claims (5)
- 正極活物質層が正極集電体に配置された正極と、
負極活物質層が負極集電体に配置された負極と、
セパレータと、
電解液と、
を含む発電要素を、外装体内部に含むリチウムイオン二次電池であって、
該セパレータが、セパレータの重量に対して0.02〜0.11重量%の硫黄を含有する、前記リチウムイオン二次電池。 - 該セパレータが、オレフィン系樹脂層と耐熱性微粒子層とを有する、請求項1に記載のリチウムイオン二次電池。
- 該硫黄が該耐熱性微粒子層中に含有されている、請求項1または2に記載のリチウムイオン二次電池。
- 該耐熱性微粒子がアルミナまたはベーマイトである、請求項1または2に記載のリチウムイオン二次電池。
- 正極活物質層が一般式LixNiyCozMn(1−y−z)O2で表される層状結晶構造を有するリチウムニッケルコバルトマンガン複合酸化物を含む、請求項1〜4のいずれか1項に記載のリチウムイオン二次電池。
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US15/171,058 US10153471B2 (en) | 2015-06-30 | 2016-06-02 | Lithium ion secondary battery |
CN201610390359.3A CN106328871B (zh) | 2015-06-30 | 2016-06-03 | 锂离子二次电池 |
EP16173066.8A EP3113247B1 (en) | 2015-06-30 | 2016-06-06 | Lithium ion secondary battery |
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EP3113247B1 (en) | 2018-11-21 |
KR20170003392A (ko) | 2017-01-09 |
CN106328871B (zh) | 2019-10-29 |
US10153471B2 (en) | 2018-12-11 |
EP3113247A1 (en) | 2017-01-04 |
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