JP2019024004A - リチウム二次電池用正極活物質およびこれを含むリチウム二次電池 - Google Patents
リチウム二次電池用正極活物質およびこれを含むリチウム二次電池 Download PDFInfo
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- JP2019024004A JP2019024004A JP2018138314A JP2018138314A JP2019024004A JP 2019024004 A JP2019024004 A JP 2019024004A JP 2018138314 A JP2018138314 A JP 2018138314A JP 2018138314 A JP2018138314 A JP 2018138314A JP 2019024004 A JP2019024004 A JP 2019024004A
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- Prior art keywords
- positive electrode
- active material
- electrode active
- lithium secondary
- secondary battery
- Prior art date
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- 239000007774 positive electrode material Substances 0.000 title claims abstract description 109
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 82
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000002346 layers by function Substances 0.000 claims abstract description 42
- 239000013078 crystal Substances 0.000 claims abstract description 33
- 150000001875 compounds Chemical class 0.000 claims abstract description 27
- 239000000126 substance Substances 0.000 claims abstract description 25
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 16
- 239000011593 sulfur Substances 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims description 60
- 239000007773 negative electrode material Substances 0.000 claims description 19
- 239000003792 electrolyte Substances 0.000 claims description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 47
- 239000002904 solvent Substances 0.000 description 26
- -1 LiCoO 2 Chemical compound 0.000 description 23
- 229910052759 nickel Inorganic materials 0.000 description 17
- 239000011230 binding agent Substances 0.000 description 15
- 239000004020 conductor Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 238000002156 mixing Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
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- 239000004698 Polyethylene Substances 0.000 description 8
- 239000002585 base Substances 0.000 description 8
- 229910017052 cobalt Inorganic materials 0.000 description 8
- 239000010941 cobalt Substances 0.000 description 8
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 8
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- 229910001416 lithium ion Inorganic materials 0.000 description 7
- 239000000463 material Substances 0.000 description 7
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- 159000000002 lithium salts Chemical class 0.000 description 5
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
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- 125000004432 carbon atom Chemical group C* 0.000 description 4
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- 238000004140 cleaning Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 150000004677 hydrates Chemical class 0.000 description 4
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- RFFLAFLAYFXFSW-UHFFFAOYSA-N 1,2-dichlorobenzene Chemical compound ClC1=CC=CC=C1Cl RFFLAFLAYFXFSW-UHFFFAOYSA-N 0.000 description 3
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
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- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
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- 150000001340 alkali metals Chemical group 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
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- 239000008151 electrolyte solution Substances 0.000 description 3
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000003273 ketjen black Substances 0.000 description 3
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 3
- 239000011356 non-aqueous organic solvent Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
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- 238000011160 research Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- 150000003624 transition metals Chemical class 0.000 description 3
- 239000003232 water-soluble binding agent Substances 0.000 description 3
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 description 2
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- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- 229910021503 Cobalt(II) hydroxide Inorganic materials 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- 229910013716 LiNi Inorganic materials 0.000 description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229920000265 Polyparaphenylene Polymers 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
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- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical group 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 229910003481 amorphous carbon Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000000010 aprotic solvent Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052795 boron group element Inorganic materials 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 238000003795 desorption Methods 0.000 description 2
- VUPKGFBOKBGHFZ-UHFFFAOYSA-N dipropyl carbonate Chemical compound CCCOC(=O)OCCC VUPKGFBOKBGHFZ-UHFFFAOYSA-N 0.000 description 2
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- 229910052745 lead Inorganic materials 0.000 description 2
- 150000002641 lithium Chemical class 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
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- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 2
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- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 2
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- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
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- 239000004925 Acrylic resin Substances 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
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- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910013385 LiN(SO2C2F5)2 Inorganic materials 0.000 description 1
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- RJUFJBKOKNCXHH-UHFFFAOYSA-N Methyl propionate Chemical compound CCC(=O)OC RJUFJBKOKNCXHH-UHFFFAOYSA-N 0.000 description 1
- HSHXDCVZWHOWCS-UHFFFAOYSA-N N'-hexadecylthiophene-2-carbohydrazide Chemical compound CCCCCCCCCCCCCCCCNNC(=O)c1cccs1 HSHXDCVZWHOWCS-UHFFFAOYSA-N 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
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- 239000004677 Nylon Substances 0.000 description 1
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- JYVXNLLUYHCIIH-ZCFIWIBFSA-N R-mevalonolactone, (-)- Chemical compound C[C@@]1(O)CCOC(=O)C1 JYVXNLLUYHCIIH-ZCFIWIBFSA-N 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
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- RLTFLELMPUMVEH-UHFFFAOYSA-N [Li+].[O--].[O--].[O--].[V+5] Chemical compound [Li+].[O--].[O--].[O--].[V+5] RLTFLELMPUMVEH-UHFFFAOYSA-N 0.000 description 1
- IDSMHEZTLOUMLM-UHFFFAOYSA-N [Li].[O].[Co] Chemical class [Li].[O].[Co] IDSMHEZTLOUMLM-UHFFFAOYSA-N 0.000 description 1
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- FDLZQPXZHIFURF-UHFFFAOYSA-N [O-2].[Ti+4].[Li+] Chemical compound [O-2].[Ti+4].[Li+] FDLZQPXZHIFURF-UHFFFAOYSA-N 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- MQRWBMAEBQOWAF-UHFFFAOYSA-N acetic acid;nickel Chemical compound [Ni].CC(O)=O.CC(O)=O MQRWBMAEBQOWAF-UHFFFAOYSA-N 0.000 description 1
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- 229910052785 arsenic Inorganic materials 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
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- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 1
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- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 1
- ZOTKGJBKKKVBJZ-UHFFFAOYSA-L cobalt(2+);carbonate Chemical compound [Co+2].[O-]C([O-])=O ZOTKGJBKKKVBJZ-UHFFFAOYSA-L 0.000 description 1
- QAHREYKOYSIQPH-UHFFFAOYSA-L cobalt(II) acetate Chemical compound [Co+2].CC([O-])=O.CC([O-])=O QAHREYKOYSIQPH-UHFFFAOYSA-L 0.000 description 1
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- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 150000004862 dioxolanes Chemical class 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000011883 electrode binding agent Substances 0.000 description 1
- 239000003759 ester based solvent Substances 0.000 description 1
- 239000004210 ether based solvent Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical group FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052730 francium Inorganic materials 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 125000001188 haloalkyl group Chemical group 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 229910021473 hassium Inorganic materials 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
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- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- 229920002681 hypalon Polymers 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- SNHMUERNLJLMHN-UHFFFAOYSA-N iodobenzene Chemical compound IC1=CC=CC=C1 SNHMUERNLJLMHN-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- KQNPFQTWMSNSAP-UHFFFAOYSA-N isobutyric acid Chemical compound CC(C)C(O)=O KQNPFQTWMSNSAP-UHFFFAOYSA-N 0.000 description 1
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- 229920000126 latex Polymers 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- XIXADJRWDQXREU-UHFFFAOYSA-M lithium acetate Chemical compound [Li+].CC([O-])=O XIXADJRWDQXREU-UHFFFAOYSA-M 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
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- 229940017219 methyl propionate Drugs 0.000 description 1
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- PYLWMHQQBFSUBP-UHFFFAOYSA-N monofluorobenzene Chemical compound FC1=CC=CC=C1 PYLWMHQQBFSUBP-UHFFFAOYSA-N 0.000 description 1
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- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229910000008 nickel(II) carbonate Inorganic materials 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- ZULUUIKRFGGGTL-UHFFFAOYSA-L nickel(ii) carbonate Chemical compound [Ni+2].[O-]C([O-])=O ZULUUIKRFGGGTL-UHFFFAOYSA-L 0.000 description 1
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- GHZRKQCHJFHJPX-UHFFFAOYSA-N oxacycloundecan-2-one Chemical compound O=C1CCCCCCCCCO1 GHZRKQCHJFHJPX-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052699 polonium Inorganic materials 0.000 description 1
- 229920002755 poly(epichlorohydrin) Polymers 0.000 description 1
- 229920002627 poly(phosphazenes) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
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- 229920001225 polyester resin Polymers 0.000 description 1
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- 229920002223 polystyrene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 229920002717 polyvinylpyridine Polymers 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229910021481 rutherfordium Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- 229910021477 seaborgium Inorganic materials 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002153 silicon-carbon composite material Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical class O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 239000003115 supporting electrolyte Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229910052713 technetium Inorganic materials 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- GETTZEONDQJALK-UHFFFAOYSA-N trifluorotoluene Substances FC(F)(F)C1=CC=CC=C1 GETTZEONDQJALK-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/40—Nickelates
- C01G53/42—Nickelates containing alkali metals, e.g. LiNiO2
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/40—Nickelates
- C01G53/42—Nickelates containing alkali metals, e.g. LiNiO2
- C01G53/44—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese
- C01G53/50—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese of the type [MnO2]n-, e.g. Li(NixMn1-x)O2, Li(MyNixMn1-x-y)O2
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- 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
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- H—ELECTRICITY
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- 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
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- H—ELECTRICITY
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- 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
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- H—ELECTRICITY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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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
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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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
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- H—ELECTRICITY
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- 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
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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Abstract
Description
LiaNixCoyMezO2
前記化学式1において、0.9≦a≦1.1、0.5≦x≦0.93、0<y≦0.3、0<z≦0.3、x+y+z=1であり、
Meは、MnまたはAlである。
したがって、前記正極活物質を含む正極を適用した本発明によるリチウム二次電池は、高容量および高安定性を有し、かつ寿命特性を画期的に向上させることができる。
LiaNixCoyMezO2
このように、正極活物質が前記コアの結晶構造と異なる1種の結晶構造を含む機能性を含む場合、構造的により安定されるので、電池の充電・放電時に正極活物質の構造がよく維持されることができ、よってサイクル寿命の特性及び安定性に優れることができる。
水酸化リチウム、水酸化ニッケル、水酸化コバルト、アルミニウムヒドロキシドを、Li:Ni:Co:Alが1:0.85:0.13:0.02のモル比となるように混合した。
正極活物質コア表面に立方晶系と六方晶系との混合構造からなる第1層を形成し、第1層の表面に立方晶系構造を含む第2層を形成して第1層および第2層を含む機能性層を形成し、正極活物質の硫黄含有量が200ppmとなるように正極活物質コアと水の混合比を重量比1:1で混合した洗浄工程条件を調節したことを除いては、実施例1と同様の方法で正極活物質を製造した。この時、第1層と第2層の平均厚さ比率は1:4であった。上記正極活物質と混合した溶媒のpHは7.5であった。
水にNaOHを添加してpHが12.5である塩基溶媒(濃度:5重量%)を製造し、正極活物質コアと上記塩基溶媒を1:0.75(約1.33:1)の重量比で混合して洗浄工程を行ったことを除いては、実施例1と同様の方法で正極活物質の硫黄の含有量が400ppmである正極活物質を製造した。
正極活物質コアの表面に立方晶系と六方晶系との混合構造からなる第1層を形成し、第1層の表面に立方晶系構造を含む第2層を形成し、第1層及び第2層を含む機能性層を形成し、正極活物質の硫黄含有量が100ppmとなるように正極活物質コアと水の混合比を1:1.5(約0.67:1)の重量比で混合した洗浄工程条件を調節したことを除いては、実施例1と同様の方法で正極活物質を製造した。この際に、第1層及び第2層の平均厚さの比率は1:4であった。上記正極活物質と混合した溶媒のpHは7.5であった。
水にNaOHを添加してpHが12.5である塩基溶媒(濃度:5重量%)を製造し、正極活物質コアと上記塩基溶媒を1:0.5の重量比で混合して洗浄工程を行ったことを除いては、実施例1と同様の方法で別途の機能性層なしに層状の六方晶系構造からなり、硫黄含有量が1000ppmである正極活物質を製造した。
正極活物質コア表面に立方晶系と六方晶系との混合構造からなる機能性層を形成し、正極活物質の硫黄含有量が500ppmとなるように正極活物質と水を1:0.5の重量比で混合する洗浄工程条件を調節して正極活物質を製造したことを除いては、実施例1と同様の方法で正極活物質を製造した。
正極活物質コア表面に立方晶系と六方晶系との混合構造からなる機能性層を形成し、正極活物質の硫黄含有量が30ppmとなるように正極活物質と水を1:3の重量比で混合する洗浄工程条件を調節して正極活物質を製造したことを除いては、実施例1と同様の方法で正極活物質を製造した。
実施例1〜4および比較例1〜3により製造された半電池を25℃で、3.0V〜4.3V範囲内で1Cで充放電を200回実施して、放電容量を測定した。また、1回放電容量に対する200回放電容量比率を計算して容量維持率を求め、これをサイクル寿命とした。
20 負極
30 セパレータ
40 電極組立体
50 ケース
100 リチウム二次電池
101 コア
102 機能性層
Claims (12)
- 下記の化学式1で表される化合物を含むコアと、
前記コアの表面に位置する機能性層と、
を含み、
前記機能性層は、前記コアの結晶構造と異なる1種の結晶構造を含む、リチウム二次電池用正極活物質であって、
前記リチウム二次電池用正極活物質は100ppm〜400ppm範囲の硫黄を含むリチウム二次電池用正極活物質。
[化学式1]
LiaNixCoyMezO2
前記化学式1において、0.9≦a≦1.1、0.5≦x≦0.93、0<y≦0.3、0<z≦0.3、x+y+z=1であり、Meは、MnまたはAlである。 - 前記リチウム二次電池用正極活物質は100ppm〜200ppm範囲の硫黄を含む、請求項1に記載のリチウム二次電池用正極活物質。
- 前記機能性層の平均厚さは3nm〜60nmである、請求項1に記載のリチウム二次電池用正極活物質。
- 前記機能性層は、前記コアの結晶構造と異なる1種の結晶構造のみを含む層を含むものである、請求項1に記載のリチウム二次電池用正極活物質。
- 前記1種の結晶構造は立方晶系構造である、請求項1に記載のリチウム二次電池用正極活物質。
- 前記コアは、六方晶系構造または層状の六方晶系結晶構造を含む、請求項1に記載のリチウム二次電池用正極活物質。
- 前記機能性層は、
少なくとも2種の結晶構造を含む第1層と、前記1種の結晶構造を含む第2層とを含む、請求項1に記載のリチウム二次電池用正極活物質。 - 前記第1層の平均厚さは、
前記機能性層の平均厚さを基準に、2%〜20%範囲である、請求項7に記載のリチウム二次電池用正極活物質。 - 前記第1層は前記コア表面に位置し、
前記第2層は前記第1層の表面に位置する、請求項7に記載のリチウム二次電池用正極活物質。 - 前記第1層は、立方晶系構造と六方晶系構造とが混合された構造を含み、
前記第2層は立方晶系構造を含む、請求項7に記載のリチウム二次電池用正極活物質。 - 前記化学式1において、xは下記式1の範囲を満足する、請求項1に記載のリチウム二次電池用正極活物質。
[式1]
0.7≦x≦0.93 - 請求項1乃至10のいずれか1項に記載の正極活物質を含む正極と、
負極活物質を含む負極と、
電解質と、
を含む、リチウム二次電池。
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