WO2013058224A1 - 非水電解液及びそれを用いた蓄電デバイス - Google Patents
非水電解液及びそれを用いた蓄電デバイス Download PDFInfo
- Publication number
- WO2013058224A1 WO2013058224A1 PCT/JP2012/076660 JP2012076660W WO2013058224A1 WO 2013058224 A1 WO2013058224 A1 WO 2013058224A1 JP 2012076660 W JP2012076660 W JP 2012076660W WO 2013058224 A1 WO2013058224 A1 WO 2013058224A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- carbonate
- group
- lithium
- electrolytic solution
- carbon atoms
- Prior art date
Links
- 239000011255 nonaqueous electrolyte Substances 0.000 title claims abstract description 57
- 238000003860 storage Methods 0.000 title claims description 50
- -1 isocyanate compound Chemical group 0.000 claims abstract description 89
- 150000003839 salts Chemical class 0.000 claims abstract description 27
- 150000002148 esters Chemical group 0.000 claims abstract description 26
- 239000003792 electrolyte Substances 0.000 claims abstract description 23
- 239000003125 aqueous solvent Substances 0.000 claims abstract description 15
- 125000002947 alkylene group Chemical group 0.000 claims abstract description 14
- 125000005843 halogen group Chemical group 0.000 claims abstract description 14
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 13
- 239000012948 isocyanate Substances 0.000 claims abstract description 12
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 11
- 125000003342 alkenyl group Chemical group 0.000 claims abstract description 10
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 9
- 125000005647 linker group Chemical group 0.000 claims abstract description 7
- 125000003545 alkoxy group Chemical group 0.000 claims abstract description 6
- 125000003118 aryl group Chemical group 0.000 claims abstract description 6
- 125000003302 alkenyloxy group Chemical group 0.000 claims abstract description 5
- 125000004104 aryloxy group Chemical group 0.000 claims abstract description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 76
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 71
- 239000008151 electrolyte solution Substances 0.000 claims description 49
- 125000004432 carbon atom Chemical group C* 0.000 claims description 43
- 150000001875 compounds Chemical class 0.000 claims description 34
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 32
- 150000005676 cyclic carbonates Chemical class 0.000 claims description 31
- 229910052760 oxygen Inorganic materials 0.000 claims description 28
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims description 27
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 24
- 239000002904 solvent Substances 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 19
- 229910003002 lithium salt Inorganic materials 0.000 claims description 16
- 159000000002 lithium salts Chemical group 0.000 claims description 16
- 150000005678 chain carbonates Chemical class 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 14
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims description 12
- 239000003575 carbonaceous material Substances 0.000 claims description 11
- 239000007773 negative electrode material Substances 0.000 claims description 10
- 229910044991 metal oxide Inorganic materials 0.000 claims description 9
- 150000004706 metal oxides Chemical class 0.000 claims description 9
- 239000007774 positive electrode material Substances 0.000 claims description 9
- 229910013870 LiPF 6 Inorganic materials 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 8
- 125000001153 fluoro group Chemical group F* 0.000 claims description 8
- 229910001386 lithium phosphate Inorganic materials 0.000 claims description 8
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 claims description 8
- BJWMSGRKJIOCNR-UHFFFAOYSA-N 4-ethenyl-1,3-dioxolan-2-one Chemical compound C=CC1COC(=O)O1 BJWMSGRKJIOCNR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052731 fluorine Inorganic materials 0.000 claims description 7
- 150000005687 symmetric chain carbonates Chemical class 0.000 claims description 7
- 229910013063 LiBF 4 Inorganic materials 0.000 claims description 6
- 229910012258 LiPO Inorganic materials 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 6
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 6
- 229910013528 LiN(SO2 CF3)2 Inorganic materials 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 150000001733 carboxylic acid esters Chemical class 0.000 claims description 5
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 5
- 150000002736 metal compounds Chemical class 0.000 claims description 5
- RCIJMMSZBQEWKW-UHFFFAOYSA-N methyl propan-2-yl carbonate Chemical compound COC(=O)OC(C)C RCIJMMSZBQEWKW-UHFFFAOYSA-N 0.000 claims description 5
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 claims description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 5
- 239000010452 phosphate Substances 0.000 claims description 5
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 claims description 4
- 229910000733 Li alloy Inorganic materials 0.000 claims description 4
- 229910013385 LiN(SO2C2F5)2 Inorganic materials 0.000 claims description 4
- FWBMVXOCTXTBAD-UHFFFAOYSA-N butyl methyl carbonate Chemical compound CCCCOC(=O)OC FWBMVXOCTXTBAD-UHFFFAOYSA-N 0.000 claims description 4
- 239000001989 lithium alloy Substances 0.000 claims description 4
- DPNXHTDWGGVXID-UHFFFAOYSA-N 2-isocyanatoethyl prop-2-enoate Chemical compound C=CC(=O)OCCN=C=O DPNXHTDWGGVXID-UHFFFAOYSA-N 0.000 claims description 3
- FOLJHXWWJYUOJV-UHFFFAOYSA-N 4-ethynyl-1,3-dioxolan-2-one Chemical compound O=C1OCC(C#C)O1 FOLJHXWWJYUOJV-UHFFFAOYSA-N 0.000 claims description 3
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 3
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 3
- 150000001721 carbon Chemical group 0.000 claims description 3
- QLVWOKQMDLQXNN-UHFFFAOYSA-N dibutyl carbonate Chemical compound CCCCOC(=O)OCCCC QLVWOKQMDLQXNN-UHFFFAOYSA-N 0.000 claims description 3
- VUPKGFBOKBGHFZ-UHFFFAOYSA-N dipropyl carbonate Chemical compound CCCOC(=O)OCCC VUPKGFBOKBGHFZ-UHFFFAOYSA-N 0.000 claims description 3
- CYEDOLFRAIXARV-UHFFFAOYSA-N ethyl propyl carbonate Chemical compound CCCOC(=O)OCC CYEDOLFRAIXARV-UHFFFAOYSA-N 0.000 claims description 3
- RBQRWNWVPQDTJJ-UHFFFAOYSA-N methacryloyloxyethyl isocyanate Chemical compound CC(=C)C(=O)OCCN=C=O RBQRWNWVPQDTJJ-UHFFFAOYSA-N 0.000 claims description 3
- PQIOSYKVBBWRRI-UHFFFAOYSA-N methylphosphonyl difluoride Chemical group CP(F)(F)=O PQIOSYKVBBWRRI-UHFFFAOYSA-N 0.000 claims description 3
- 239000010450 olivine Substances 0.000 claims description 3
- 229910052609 olivine Inorganic materials 0.000 claims description 3
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 3
- ZFDIRQKJPRINOQ-UHFFFAOYSA-N transbutenic acid ethyl ester Natural products CCOC(=O)C=CC ZFDIRQKJPRINOQ-UHFFFAOYSA-N 0.000 claims description 3
- LWLOKSXSAUHTJO-UHFFFAOYSA-N 4,5-dimethyl-1,3-dioxolan-2-one Chemical compound CC1OC(=O)OC1C LWLOKSXSAUHTJO-UHFFFAOYSA-N 0.000 claims description 2
- 229910013131 LiN Inorganic materials 0.000 claims description 2
- DZYFUUQMKQBVBY-UHFFFAOYSA-N bis(2-isocyanatoethyl) carbonate Chemical compound O=C=NCCOC(=O)OCCN=C=O DZYFUUQMKQBVBY-UHFFFAOYSA-N 0.000 claims description 2
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 claims 1
- 125000001261 isocyanato group Chemical group *N=C=O 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 26
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 230000000694 effects Effects 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 11
- 229910001416 lithium ion Inorganic materials 0.000 description 11
- 229910002804 graphite Inorganic materials 0.000 description 10
- 239000010439 graphite Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 9
- 150000001450 anions Chemical class 0.000 description 9
- 238000000354 decomposition reaction Methods 0.000 description 9
- 239000011572 manganese Substances 0.000 description 9
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 7
- 229910052718 tin Inorganic materials 0.000 description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 6
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 6
- 239000002033 PVDF binder Substances 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 229910021383 artificial graphite Inorganic materials 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 6
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 description 5
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 5
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 5
- 229910013872 LiPF Inorganic materials 0.000 description 5
- 101150058243 Lipf gene Proteins 0.000 description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 239000006230 acetylene black Substances 0.000 description 5
- 239000006258 conductive agent Substances 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 150000002513 isocyanates Chemical class 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 229910021382 natural graphite Inorganic materials 0.000 description 5
- MHYFEEDKONKGEB-UHFFFAOYSA-N oxathiane 2,2-dioxide Chemical compound O=S1(=O)CCCCO1 MHYFEEDKONKGEB-UHFFFAOYSA-N 0.000 description 5
- 235000021317 phosphate Nutrition 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- RIUWBIIVUYSTCN-UHFFFAOYSA-N trilithium borate Chemical compound [Li+].[Li+].[Li+].[O-]B([O-])[O-] RIUWBIIVUYSTCN-UHFFFAOYSA-N 0.000 description 5
- WRAXODRAAIYKAW-UHFFFAOYSA-N 3-methylsulfonyloxybutan-2-yl methanesulfonate Chemical compound CS(=O)(=O)OC(C)C(C)OS(C)(=O)=O WRAXODRAAIYKAW-UHFFFAOYSA-N 0.000 description 4
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
- 150000001768 cations Chemical class 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910017052 cobalt Inorganic materials 0.000 description 4
- 239000010941 cobalt Substances 0.000 description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 4
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 4
- AFOSIXZFDONLBT-UHFFFAOYSA-N divinyl sulfone Chemical class C=CS(=O)(=O)C=C AFOSIXZFDONLBT-UHFFFAOYSA-N 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 150000002825 nitriles Chemical class 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- OWAHJGWVERXJMI-UHFFFAOYSA-N prop-2-ynyl methanesulfonate Chemical compound CS(=O)(=O)OCC#C OWAHJGWVERXJMI-UHFFFAOYSA-N 0.000 description 4
- YTZKOQUCBOVLHL-UHFFFAOYSA-N tert-butylbenzene Chemical compound CC(C)(C)C1=CC=CC=C1 YTZKOQUCBOVLHL-UHFFFAOYSA-N 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- WDXYVJKNSMILOQ-UHFFFAOYSA-N 1,3,2-dioxathiolane 2-oxide Chemical compound O=S1OCCO1 WDXYVJKNSMILOQ-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
- VWEYDBUEGDKEHC-UHFFFAOYSA-N 3-methyloxathiolane 2,2-dioxide Chemical compound CC1CCOS1(=O)=O VWEYDBUEGDKEHC-UHFFFAOYSA-N 0.000 description 3
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910013733 LiCo 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
- 239000000654 additive Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 150000001491 aromatic compounds Chemical class 0.000 description 3
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- 239000011889 copper foil Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000002180 crystalline carbon material Substances 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
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- 229910052733 gallium Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 150000002596 lactones Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 125000003258 trimethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])[*:1] 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- 229910052726 zirconium Inorganic materials 0.000 description 3
- OYTMCDCWKVWQET-UHFFFAOYSA-N 1-ethenylsulfonyl-2-(2-ethenylsulfonylethoxy)ethane Chemical compound C=CS(=O)(=O)CCOCCS(=O)(=O)C=C OYTMCDCWKVWQET-UHFFFAOYSA-N 0.000 description 2
- CQVKMVQRSNNAGO-UHFFFAOYSA-N 2-[4-formyl-3-methyl-n-(2-methylsulfonyloxyethyl)anilino]ethyl methanesulfonate Chemical compound CC1=CC(N(CCOS(C)(=O)=O)CCOS(C)(=O)=O)=CC=C1C=O CQVKMVQRSNNAGO-UHFFFAOYSA-N 0.000 description 2
- QHTJSSMHBLGUHV-UHFFFAOYSA-N 2-methylbutan-2-ylbenzene Chemical compound CCC(C)(C)C1=CC=CC=C1 QHTJSSMHBLGUHV-UHFFFAOYSA-N 0.000 description 2
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- RAEHYISCRHEVNT-UHFFFAOYSA-N 5-methyloxathiolane 2,2-dioxide Chemical compound CC1CCS(=O)(=O)O1 RAEHYISCRHEVNT-UHFFFAOYSA-N 0.000 description 2
- COVZYZSDYWQREU-UHFFFAOYSA-N Busulfan Chemical compound CS(=O)(=O)OCCCCOS(C)(=O)=O COVZYZSDYWQREU-UHFFFAOYSA-N 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- 229910014395 LiNi1/2Mn3/2O4 Inorganic materials 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- RJUFJBKOKNCXHH-UHFFFAOYSA-N Methyl propionate Chemical compound CCC(=O)OC RJUFJBKOKNCXHH-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 2
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- 238000002441 X-ray diffraction Methods 0.000 description 2
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- 238000003487 electrochemical reaction Methods 0.000 description 2
- 150000002170 ethers Chemical class 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- GAEKPEKOJKCEMS-UHFFFAOYSA-N gamma-valerolactone Chemical compound CC1CCC(=O)O1 GAEKPEKOJKCEMS-UHFFFAOYSA-N 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 2
- LLEVMYXEJUDBTA-UHFFFAOYSA-N heptanedinitrile Chemical compound N#CCCCCCC#N LLEVMYXEJUDBTA-UHFFFAOYSA-N 0.000 description 2
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- 230000006872 improvement Effects 0.000 description 2
- 230000010220 ion permeability Effects 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- QLOAVXSYZAJECW-UHFFFAOYSA-N methane;molecular fluorine Chemical compound C.FF QLOAVXSYZAJECW-UHFFFAOYSA-N 0.000 description 1
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- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
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- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- QMKUYPGVVVLYSR-UHFFFAOYSA-N propyl 2,2-dimethylpropanoate Chemical compound CCCOC(=O)C(C)(C)C QMKUYPGVVVLYSR-UHFFFAOYSA-N 0.000 description 1
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
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- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical compound CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 1
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- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
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- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/54—Electrolytes
- H01G11/58—Liquid electrolytes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/54—Electrolytes
- H01G11/58—Liquid electrolytes
- H01G11/60—Liquid electrolytes characterised by the solvent
-
- 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
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- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
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- H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
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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
- H01M4/58—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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- 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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- 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
- Y02E60/13—Energy storage using capacitors
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a nonaqueous electrolytic solution capable of improving electrochemical characteristics in a wide temperature range and an electricity storage device using the same.
- power storage devices particularly lithium secondary batteries
- small electronic devices such as mobile phones and notebook computers, electric vehicles, and power storage.
- These electronic devices, automobiles, and power storage applications may be used in a wide temperature range, such as high temperatures in midsummer or low temperatures in extremely cold temperatures. Is required.
- high temperatures in midsummer or low temperatures in extremely cold temperatures Is required.
- environmentally friendly vehicles equipped with power storage devices consisting of power storage devices such as lithium secondary batteries and capacitors
- HEV hybrid electric vehicles
- PHEV plug-in hybrid electric vehicles
- BEV battery electric vehicles Due to the long travel distance of automobiles, automobiles may be used in areas with a wide temperature range from extremely hot areas in the tropics to extremely cold areas.
- lithium secondary battery is used as a concept including so-called lithium ion secondary batteries.
- the lithium secondary battery is mainly composed of a positive electrode and a negative electrode containing a material capable of occluding and releasing lithium, a non-aqueous electrolyte composed of a lithium salt and a non-aqueous solvent, and the non-aqueous solvent includes ethylene carbonate (EC), Carbonates such as propylene carbonate (PC) are used.
- EC ethylene carbonate
- PC propylene carbonate
- metal lithium metal compounds that can occlude and release lithium (metal simple substance, oxide, alloy with lithium, etc.) and carbon materials are known, and in particular, lithium can be occluded and released.
- Lithium secondary batteries using carbon materials such as coke, artificial graphite and natural graphite have been widely put into practical use.
- a lithium secondary battery using a highly crystallized carbon material such as natural graphite or artificial graphite as a negative electrode material is a decomposition product generated by reductive decomposition of a solvent in a non-aqueous electrolyte on the negative electrode surface during charging. It has been found that the gas interferes with the desired electrochemical reaction of the battery, resulting in poor cycle characteristics. Moreover, when the decomposition product of the nonaqueous solvent accumulates, it becomes impossible to smoothly occlude and release lithium into the negative electrode, and the electrochemical characteristics in a wide temperature range are liable to deteriorate.
- lithium secondary batteries using lithium metal, alloys thereof, simple metals such as tin or silicon, and oxides as negative electrode materials have high initial capacities, but fine powders progress during the cycle.
- reductive decomposition of a non-aqueous solvent occurs at an accelerated rate, and battery performance such as battery capacity and cycle characteristics is greatly reduced.
- these anode materials are pulverized or a decomposition product of a nonaqueous solvent accumulates, lithium cannot be smoothly inserted into and released from the anode, and the electrochemical characteristics in a wide temperature range are likely to be deteriorated.
- a lithium secondary battery using, for example, LiCoO 2 , LiMn 2 O 4 , LiNiO 2 , LiFePO 4, or the like as the positive electrode includes a positive electrode material, a non-aqueous electrolyte, and a non-aqueous solvent in a non-aqueous electrolyte in a charged state. It has been found that degradation products and gases generated by partial oxidative decomposition locally at the interface of the battery inhibit the desired electrochemical reaction of the battery, resulting in degradation of electrochemical characteristics over a wide temperature range. Yes.
- the battery performance has been deteriorated due to the movement of lithium ions or the expansion of the battery due to the decomposition product or gas when the non-aqueous electrolyte is decomposed on the positive electrode or the negative electrode.
- electronic devices equipped with lithium secondary batteries are becoming more and more multifunctional and power consumption is increasing.
- the capacity of lithium secondary batteries has been increasing, and the volume occupied by non-aqueous electrolyte in the battery has become smaller, such as increasing the electrode density and reducing the useless space volume in the battery. . Therefore, the electrochemical characteristics in a wide temperature range are likely to be deteriorated by a slight decomposition of the nonaqueous electrolytic solution.
- Patent Document 1 proposes a nonaqueous electrolytic solution containing a specific compound having an isocyanate group together with a carbonate having an unsaturated bond or a halogen atom, and suggests an improvement in cycle characteristics.
- Patent Document 2 proposes a non-aqueous electrolyte containing a diisocyanate compound such as 1,6-diisocyanatohexane or isocyanatoethyl or a monoisocyanate compound, and describes improvement of cycle characteristics. .
- An object of the present invention is to provide a nonaqueous electrolytic solution capable of improving electrochemical characteristics in a wide temperature range and an electricity storage device using the same.
- the present inventors have examined in detail the performance of the above-described prior art non-aqueous electrolyte.
- the non-aqueous electrolyte of the above-mentioned patent document cannot be said to be sufficiently satisfactory for the problem of improving electrochemical characteristics in a wide temperature range such as low temperature discharge characteristics after high temperature storage. It was a fact. Therefore, the present inventors have made extensive studies to solve the above problems, and in nonaqueous electrolytes in which an electrolyte salt is dissolved in a nonaqueous solvent, isocyanates having a specific ester structure in the nonaqueous electrolyte solution. It has been found that the inclusion of one or more of can improve the electrochemical characteristics over a wide temperature range, particularly the electrochemical characteristics of lithium batteries, and has completed the present invention.
- the present invention provides the following (1) to (17).
- the non-aqueous electrolyte solution in which an electrolyte salt is dissolved in a non-aqueous solvent, contains at least one isocyanate compound having an ester structure represented by the following general formula (I).
- I A feature of non-aqueous electrolyte.
- R represents an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms, or a carbon atom, wherein at least one hydrogen atom may be substituted with a halogen atom
- R in the compound represented by the general formula (I) is an alkyl group having 1 to 6 carbon atoms in which at least one hydrogen atom may be substituted with a halogen atom, or 2 to 6 carbon atoms
- X in the compound represented by the general formula (I) is a linear or branched alkylene group having 1 to 6 carbon atoms in which at least one hydrogen atom may be substituted with a halogen atom (1)
- R is an alkenyl group having 2 to 6 carbon atoms
- X is a linear alkylene group having 1 to 6 carbon atoms.
- the compound represented by the general formula (I) is 2-isocyanatoethyl acrylate, 2-isocyanatoethyl methacrylate, 2-isocyanatoethyl crotonate, 2- (2-isocyanatoethoxy) ethyl acrylate, 2 -(2-isocyanatoethoxy) ethyl methacrylate, 2- (2-isocyanatoethoxy) ethyl crotonate, or one or more selected from bis (2-isocyanatoethyl) carbonate, as described in (1) above Non-aqueous electrolyte.
- the cyclic carbonate is a cyclic carbonate having an unsaturated bond selected from vinylene carbonate, vinylethylene carbonate, and 4-ethynyl-1,3-dioxolan-2-one, 4-fluoro-1,3-dioxolane- Cyclic carbonates having fluorine atoms selected from 2-one and trans or cis-4,5-difluoro-1,3-dioxolan-2-one, ethylene carbonate, propylene carbonate, 1,2-butylene carbonate, and 2,3
- the nonaqueous electrolytic solution according to (7) which is at least one of butylene carbonate.
- the cyclic carbonate contains one or more of a cyclic carbonate having an unsaturated bond which is a carbon-carbon double bond or a carbon-carbon triple bond and a cyclic carbonate having a fluorine atom.
- the chain ester is asymmetric chain carbonate selected from methyl ethyl carbonate, methyl propyl carbonate, methyl isopropyl carbonate, methyl butyl carbonate, and ethyl propyl carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, and dibutyl carbonate
- the nonaqueous electrolytic solution according to (7) which is one or more selected from a symmetric chain carbonate selected from: and a chain carboxylic acid ester.
- nonaqueous electrolytic solution according to any one of (1) to (10), wherein the nonaqueous electrolytic solution further contains at least one selected from a nitrile compound and a sultone compound. .
- the electrolyte salt is LiPF 6 , LiPO 2 F 2 , Li 2 PO 3 F, LiBF 4 , LiN (SO 2 CF 3 ) 2 , LiN (SO 2 C 2 F 5 ) 2 , LiN (SO 2 F). 2 , one or more selected from difluorobis [oxalate-O, O ′] lithium phosphate and tetrafluoro [oxalate-O, O ′] lithium phosphate, (1) to (12) above
- the non-aqueous electrolyte in any one of.
- an electricity storage device including a nonaqueous electrolytic solution in which an electrolyte salt is dissolved in a positive electrode, a negative electrode, and a nonaqueous solvent, the nonaqueous electrolytic solution described in any one of (1) to (14) above
- An electricity storage device characterized by being an electrolytic solution.
- the positive electrode includes at least one selected from a lithium composite metal oxide and a lithium-containing olivine phosphate as a positive electrode active material.
- the negative electrode includes, as a negative electrode active material, at least one selected from lithium metal, a lithium alloy, a carbon material capable of inserting and extracting lithium, and a metal compound capable of inserting and extracting lithium (The electricity storage device according to 15) or 16).
- nonaqueous electrolytic solution capable of improving electrochemical characteristics in a wide temperature range, particularly low temperature cycle characteristics and low temperature discharge characteristics after high temperature storage, and a power storage device such as a lithium battery using the nonaqueous electrolyte. it can.
- the present invention relates to a non-aqueous electrolyte and an electricity storage device using the same.
- the compound represented by the general formula (I) of the present invention has an isocyanate group (—N ⁇ C ⁇ O) and an ester structure (R—C ( ⁇ O) —O—) containing an alkylene group or an ether bond. It is bonded through a valent linking group. Since the isocyanate group has high electrophilicity and is easily reductively decomposed, it undergoes reductive decomposition on the surface of the negative electrode during the first charge to form a high resistance film.
- the compound represented by the general formula (I) of the present invention has an ester structure with low electrophilicity in addition to the isocyanate group, and the isocyanate group has an alkylene group or an ether bond. Since it is bonded to an ester structure having low electrophilicity through a divalent linking group contained therein, the rate of reductive decomposition is moderated, and the surface of the negative electrode reacts slowly. Therefore, by using the nonaqueous electrolytic solution of the present invention, a high heat resistance and low resistance film is formed on the negative electrode surface without being excessively densified, and in a wide temperature range from low temperature to high temperature. It has been found that it has a specific effect that the electrochemical properties are significantly improved.
- the isocyanate compound having an ester structure contained in the nonaqueous electrolytic solution of the present invention is represented by the following general formula (I).
- R represents an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms, or a carbon atom, wherein at least one hydrogen atom may be substituted with a halogen atom
- R in the general formula (I) is preferably an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, an alkyl group having 1 to 6 carbon atoms, More preferred is an alkenyl group having 2 to 6 carbon atoms.
- R examples include methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, iso-propyl, sec-butyl, tert-butyl, etc.
- Alkyl group vinyl group, allyl group, 1-propen-1-yl group, 2-buten-1-yl group, 3-buten-1-yl group, 4-penten-1-yl group, 5-hexene- Alkenyl groups such as 1-yl group, 1-propen-2-yl group and 3-methyl-2-buten-1-yl group, alkyloxy groups such as methoxy group, ethoxy group and propoxy group, vinyloxy group and allyloxy group Alkenyloxy groups such as isocyanatoalkyl groups such as isocyanatoethyloxy groups, phenyl groups, 2-methylphenyl groups, 3-methylphenyl groups, 4-methylphenyl groups, 4-t rt-butylphenyl group, 2,4,6-trimethylphenyl group, 2-fluorophenyl group, 3-fluorophenyl group, 4-fluorophenyl group, 2,4-difluorophenyl group, 2,6-difluorophenyl group,
- X in the general formula (I) is a linear or branched alkylene group having 1 to 6 carbon atoms in which at least one hydrogen atom may be substituted with a halogen atom, or a carbon number containing at least one ether bond. 2 to 6 divalent linking groups are shown, and an alkylene group is more preferable.
- X include methylene group, ethane-1,2-diyl group, ethane-1,1-diyl group, propane-1,3-diyl group, propane-1,2-diyl group, propane-1, 1-diyl group, butane-1,4-diyl group, butane-1,3-diyl group, 2-methylpropane-1,2-diyl group, pentane-1,5-diyl group, hexane-1,6- Alkylene groups such as diyl groups, monofluoromethylene groups, difluoromethylene groups, 1,2-difluoroethane-1,2-diyl groups, 1,1-difluoroethane-1,2-diyl groups, 1,3-difluoropropane-1 Halogenated alkylene groups such as 1,3-diyl group, 2,2-difluoropropane-1,3-diyl group, 3-oxapentane-1,
- isocyanate having an ester structure represented by the general formula (I) include the following compounds.
- isocyanates having an ester structure represented by the general formula (I) one or more selected from the compounds having the structures 1,10 to 12, 14, 15, 31 to 36, and 40 to 43 are included.
- the above range of substituents is preferable because electrochemical characteristics in a wider temperature range are improved.
- the content of the isocyanate compound having an ester structure represented by the general formula (I) contained in the non-aqueous electrolyte is 0.001 to 10 mass in the non-aqueous electrolyte. % Is preferred.
- the content is preferably 0.05% by mass or more, and more preferably 0.2% by mass or more in the nonaqueous electrolytic solution.
- the upper limit is preferably 8% by mass or less, more preferably 5% by mass or less, and particularly preferably 2% by mass or less.
- the isocyanate compound having the ester structure represented by the general formula (I) is combined with a non-aqueous solvent, an electrolyte salt, and other additives described below in a wide temperature range. It exhibits a unique effect of synergistically improving the electrochemical properties.
- Nonaqueous solvent examples of the nonaqueous solvent used in the nonaqueous electrolytic solution of the present invention include cyclic carbonates, chain esters, lactones, ethers, and amides, and include only cyclic carbonates or both cyclic carbonates and chain esters. Is preferred.
- chain ester is used as a concept including chain carbonate and chain carboxylic acid ester.
- Cyclic carbonates include ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 4-fluoro-1,3-dioxolan-2-one (FEC), trans or Cis-4,5-difluoro-1,3-dioxolan-2-one (hereinafter collectively referred to as “DFEC”), vinylene carbonate (VC), vinyl ethylene carbonate (VEC), and 4-ethynyl-1 , 3-dioxolan-2-one (EEC), ethylene carbonate, propylene carbonate, 4-fluoro-1,3-dioxolan-2-one, vinylene carbonate and 4-ethynyl- One selected from 1,3-dioxolan-2-one (EEC) Or two or more is more preferable.
- cyclic carbonate having an unsaturated bond such as a carbon-carbon double bond and a carbon-carbon triple bond
- a cyclic carbonate having a fluorine atom are included.
- VC, VEC, or EEC is more preferable
- FEC or DFEC is more preferable.
- the content of the cyclic carbonate having an unsaturated bond such as a carbon-carbon double bond or a carbon-carbon triple bond is preferably 0.07% by volume or more, more preferably 0.8%, based on the total volume of the nonaqueous solvent. 2 volume% or more, more preferably 0.7 volume% or more, and the upper limit is preferably 7 volume% or less, more preferably 4 volume% or less, still more preferably 2.5 volume% or less. This is preferable because the stability of the coating during high-temperature storage can be further increased without impairing the Li ion permeability.
- the content of the cyclic carbonate having a fluorine atom is preferably 0.07% by volume or more, more preferably 4% by volume or more, still more preferably 7% by volume or more with respect to the total volume of the non-aqueous solvent,
- the content is preferably 35% by volume or less, more preferably 25% by volume or less, and still more preferably 15% by volume or less, the stability of the coating during high temperature storage can be further increased without impairing the Li ion permeability at low temperatures. It is preferable because it is possible.
- the nonaqueous solvent contains ethylene carbonate and / or propylene carbonate
- the resistance of the film formed on the electrode is reduced, and the content of ethylene carbonate and / or propylene carbonate is preferably equal to the total volume of the nonaqueous solvent.
- it is preferably at least 3% by volume, more preferably at least 5% by volume, even more preferably at least 7% by volume, and the upper limit is preferably at most 45% by volume, more preferably at most 35% by volume, still more preferably at 25%. % By volume or less.
- solvents may be used singly, and when two or more kinds are used in combination, the electrochemical characteristics in a wide temperature range are further improved, and three or more kinds are particularly preferred.
- Preferred combinations of these cyclic carbonates include EC and PC, EC and VC, PC and VC, VC and FEC, EC and FEC, PC and FEC, FEC and DFEC, EC and DFEC, PC and DFEC, VC and DFEC , VEC and DFEC, VC and EEC, EC and EEC, EC and PC and VC, EC and PC and FEC, EC and VC and FEC, EC and VC and VEC, EC and VC and EEC, EC and EEC and FEC, PC And VC and FEC, EC and VC and DFEC, PC and VC and DFEC, EC and PC and VC and FEC, EC and PC and VC and FEC, EC and PC and VC and DFEC, and the like are preferable
- chain esters examples include asymmetric chain carbonates such as methyl ethyl carbonate (MEC), methyl propyl carbonate (MPC), methyl isopropyl carbonate (MIPC), methyl butyl carbonate, and ethyl propyl carbonate, dimethyl carbonate (DMC), and diethyl carbonate ( DEC), symmetric chain carbonates such as dipropyl carbonate and dibutyl carbonate, pivalate esters such as methyl pivalate, ethyl pivalate, and propyl pivalate, chains such as methyl propionate, ethyl propionate, methyl acetate, and ethyl acetate Preferred examples include carboxylic acid esters.
- MEC methyl ethyl carbonate
- MPC methyl propyl carbonate
- MIPC methyl isopropyl carbonate
- DMC dimethyl carbonate
- DEC diethyl carbonate
- symmetric chain carbonates such as dipropyl carbonate
- the content of the chain ester is not particularly limited, but it is preferably used in the range of 60 to 90% by volume with respect to the total volume of the nonaqueous solvent. If the content is 60% by volume or more, the effect of lowering the viscosity of the non-aqueous electrolyte is sufficiently obtained, and if it is 90% by volume or less, the electrical conductivity of the non-aqueous electrolyte is sufficiently increased, and in a wide temperature range. The above-mentioned range is preferable since the electrochemical characteristics of the above are improved.
- chain esters having a methyl group selected from dimethyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, methyl isopropyl carbonate, methyl butyl carbonate, methyl propionate, methyl acetate, and ethyl acetate are preferable, particularly methyl
- a chain carbonate having a group is preferred.
- chain carbonate it is preferable to use 2 or more types. Further, it is more preferable that both a symmetric chain carbonate and an asymmetric chain carbonate are contained, and it is further more preferable that the content of the symmetric chain carbonate is more than that of the asymmetric chain carbonate.
- the volume ratio of the symmetric chain carbonate in the chain carbonate is preferably 51% by volume or more, and more preferably 55% by volume or more. As an upper limit, 95 volume% or less is more preferable, and it is still more preferable in it being 85 volume% or less. It is particularly preferred that the symmetric chain carbonate contains dimethyl carbonate.
- the asymmetric chain carbonate preferably has a methyl group, and methyl ethyl carbonate is particularly preferable. The above case is preferable because electrochemical characteristics in a wider temperature range are improved.
- the ratio between the cyclic carbonate and the chain ester is preferably 10:90 to 70:30, and 15:85 to 50:30 in terms of the cyclic carbonate: chain ester (volume ratio) from the viewpoint of improving electrochemical characteristics in a wide temperature range. 50 is more preferable, and 20:80 to 35:65 is particularly preferable.
- nonaqueous solvents include tetrahydrofuran, 2-methyltetrahydrofuran, 1,3-dioxolane, 1,3-dioxane, 1,4-dioxane and other cyclic ethers, 1,2-dimethoxyethane, 1,2-diethoxy
- Preferable examples include chain ethers such as ethane and 1,2-dibutoxyethane, amides such as dimethylformamide, sulfones such as sulfolane, lactones such as ⁇ -butyrolactone, ⁇ -valerolactone, and ⁇ -angelicalactone.
- the above non-aqueous solvents are usually used as a mixture in order to achieve appropriate physical properties.
- the combination includes, for example, a combination of a cyclic carbonate and a chain carbonate, a combination of a cyclic carbonate and a chain carboxylic acid ester, a combination of a cyclic carbonate, a chain carbonate and a lactone, and a combination of a cyclic carbonate, a chain carbonate and an ether.
- a combination, a combination of a cyclic carbonate, a chain carbonate, and a chain carboxylate, and the like are preferable.
- additives for the purpose of improving electrochemical characteristics over a wider temperature range, it is preferable to add other additives to the non-aqueous electrolyte.
- other additives include phosphate esters such as trimethyl phosphate, tributyl phosphate, and trioctyl phosphate, nitriles such as acetonitrile, propionitrile, succinonitrile, glutaronitrile, adiponitrile, and pimelonitrile, Isocyanates other than isocyanate compounds having an ester structure represented by the above general formula (I) such as tetramethylene diisocyanate, hexamethylene diisocyanate, octamethylene diisocyanate, 1,3-propane sultone, 1,3-butane sultone, 2,4 -Sultone compounds such as butane sultone and 1,4-butane sultone, ethylene sulfite, hexahydrobenzo [1,3,
- nitrile and / or an aromatic compound because the electrochemical characteristics in a wider temperature range are further improved.
- nitriles succinonitrile, glutaronitrile, adiponitrile, and pimelonitrile are more preferable.
- aromatic compounds biphenyl, cyclohexylbenzene, tert-butylbenzene, and tert-amylbenzene are more preferred.
- the content of nitrile and / or aromatic compound is preferably 0.001 to 5% by mass in the non-aqueous electrolyte.
- the coating film is sufficiently formed without becoming too thick, and the effect of improving the electrochemical characteristics over a wide temperature range is enhanced.
- the content is more preferably 0.005% by mass or more, more preferably 0.01% by mass or more, particularly preferably 0.03% by mass or more in the non-aqueous electrolyte, and the upper limit is 3% by mass or less. More preferably, 1% by mass or less is further preferable, and 0.4% by mass or less is particularly preferable.
- a cyclic or chain-containing S ⁇ O group-containing compound selected from sultone compounds, cyclic sulfites, sulfonic acid esters, and vinyl sulfones, since the electrochemical characteristics in a wider temperature range are further improved.
- 1,3-propane sultone, 1,3-butane sultone, 2,4-butane sultone, 1,4-butane sultone, ethylene sulfite, 4- (methylsulfonylmethyl) -1 1,3-Dioxathiolane-2-oxide is preferred, and 1,3-propane sultone and 1,4-butane sultone are more preferred.
- 2-propynyl methanesulfonate, butane-2,3-diyl dimethanesulfonate, butane-1,4-diyl dimethanesulfonate, 2-butyne-1,4- Diyl dimethanesulfonate, methylenemethane disulfonate, divinylsulfone, bis (2-vinylsulfonylethyl) ether are preferred, 1,3-propane sultone, 2,4-butane sultone, 1,4-butane sultone, 2-propynyl methanesulfonate And at least one sulfonate selected from butane-2,3-diyl dimethanesulfonate, 2-butyne-1,4-diyl dimethanesulfonate, 1,3-propane sultone, 2,4-butane
- the content of the S ⁇ O group-containing compound is preferably 0.001 to 5 mass% in the non-aqueous electrolyte. In this range, the coating film is sufficiently formed without becoming too thick, and the effect of improving the electrochemical characteristics over a wide temperature range is enhanced.
- the content is more preferably 0.005% by mass or more, more preferably 0.01% by mass or more, particularly preferably 0.03% by mass or more in the non-aqueous electrolyte, and the upper limit is 3% by mass or less. More preferably, 1% by mass or less is further preferable, and 0.4% by mass or less is particularly preferable.
- Electrolyte salt Preferred examples of the electrolyte salt used in the present invention include the following lithium salts and onium salts.
- lithium salt examples include inorganic lithium salts such as LiPF 6 , LiPO 2 F 2 , Li 2 PO 3 F, LiBF 4 , LiClO 4 , LiN (SO 2 CF 3 ) 2 , LiN (SO 2 C 2 F 5 ) 2 , LiCF 3 SO 3 , LiC (SO 2 CF 3 ) 3 , LiPF 4 (CF 3 ) 2 , LiPF 3 (C 2 F 5 ) 3 , LiPF 3 (CF 3 ) 3 , LiPF 3 (iso-C 3 F 7 ) 3 , LiPF 5 (iso-C 3 F 7 ) -containing lithium salt containing a fluorinated alkyl group, (CF 2 ) 2 (SO 2 ) 2 NLi, (CF 2 ) 3 (SO 2 ) 2 Lithium salt having a cyclic fluorinated alkylene chain such as NLi, lithium bis [oxalate-O, O ′] lithium borate, difluoro [
- the concentration of the lithium salt is usually preferably 0.3 M or more, more preferably 0.7 M or more, and further preferably 1.1 M or more with respect to the non-aqueous solvent.
- the upper limit is preferably 2.5M or less, more preferably 2.0M or less, and still more preferably 1.6M or less.
- suitable combinations of these lithium salts include LiPF 6, further LiPO 2 F 2, LiBF 4 and LiN (SO 2 CF 3) at least one lithium salt selected from 2 nonaqueous solution When the ratio of the lithium salt other than LiPF 6 in the non-aqueous solvent is 0.001 M or more, the electrochemical characteristics in a wide temperature range are easily improved and the effect is improved.
- 5M or less is preferable because there is little concern that the effect of improving electrochemical characteristics over a wide temperature range will be reduced.
- it is 0.01M or more, Especially preferably, it is 0.03M or more, Most preferably, it is 0.04M or more.
- the upper limit is preferably 0.4M or less, particularly preferably 0.2M or less.
- onium salt As an onium salt, the various salts which combined the onium cation and anion shown below are mentioned suitably.
- Specific examples of onium cations include tetramethylammonium cation, ethyltrimethylammonium cation, diethyldimethylammonium cation, triethylmethylammonium cation, tetraethylammonium cation, N, N-dimethylpyrrolidinium cation, N-ethyl-N-methylpyrrole.
- N, N-diethylpyrrolidinium cation Dinium cation, N, N-diethylpyrrolidinium cation, spiro- (N, N ′)-bipyrrolidinium cation, N, N′-dimethylimidazolinium cation, N-ethyl-N′-methylimidazoli
- Preferable examples include nium cation, N, N′-diethylimidazolinium cation, N, N′-dimethylimidazolium cation, N-ethyl-N′-methylimidazolium cation, and N, N′-diethylimidazolium cation.
- anion examples include PF 6 anion, BF 4 anion, ClO 4 anion, AsF 6 anion, CF 3 SO 3 anion, N (CF 3 SO 2 ) 2 anion, N (C 2 F 5 SO 2 ) 2 anion. , Etc. are mentioned suitably.
- electrolyte salts can be used singly or in combination of two or more.
- the nonaqueous electrolytic solution of the present invention is obtained, for example, by mixing the nonaqueous solvent and adding the compound represented by the general formula (I) to the electrolyte salt and the nonaqueous electrolytic solution. Obtainable. At this time, it is preferable that the compound added to the non-aqueous solvent and the non-aqueous electrolyte to be used is one that is purified in advance and has as few impurities as possible within a range that does not significantly reduce the productivity.
- the non-aqueous electrolyte of the present invention can be used in the following first to fourth power storage devices, and as the non-aqueous electrolyte, not only a liquid but also a gelled one can be used. Furthermore, the non-aqueous electrolyte of the present invention can be used for a solid polymer electrolyte. Among them, the nonaqueous electrolytic solution of the present invention is used for a first power storage device (that is, for a lithium battery) or a fourth power storage device (that is, for a lithium ion capacitor) that uses a lithium salt as an electrolyte salt. It is preferable to use it for lithium batteries, and it is most suitable to use for lithium secondary batteries.
- the lithium battery of the present invention is a generic term for a lithium primary battery and a lithium secondary battery.
- the term lithium secondary battery is used as a concept including a so-called lithium ion secondary battery.
- the lithium battery of the present invention comprises the nonaqueous electrolyte solution in which an electrolyte salt is dissolved in a positive electrode, a negative electrode, and a nonaqueous solvent.
- Components other than the non-aqueous electrolyte, such as a positive electrode and a negative electrode can be used without particular limitation.
- a composite metal oxide with lithium containing one or more selected from cobalt, manganese, and nickel is used as the positive electrode active material for a lithium secondary battery.
- lithium composite metal oxides include LiCoO 2 , LiMn 2 O 4 , LiNiO 2 , LiCo 1-x Ni x O 2 (0.01 ⁇ x ⁇ 1), LiCo 1/3 Ni 1/3. Examples thereof include Mn 1/3 O 2 , LiNi 1/2 Mn 3/2 O 4 , and LiCo 0.98 Mg 0.02 O 2 .
- LiCoO 2 and LiMn 2 O 4, LiCoO 2 and LiNiO 2 may be used in combination as LiMn 2 O 4 and LiNiO 2.
- a part of the lithium composite metal oxide is replaced with another element.
- a part of cobalt, manganese, nickel is replaced with at least one element such as Sn, Mg, Fe, Ti, Al, Zr, Cr, V, Ga, Zn, Cu, Bi, Mo, La, etc.
- a part of O may be substituted with S or F, or a compound containing these other elements may be coated.
- lithium composite metal oxides such as LiCoO 2 , LiMn 2 O 4 , and LiNiO 2 that can be used at a charged potential of the positive electrode in a fully charged state of 4.3 V or more on the basis of Li are preferable, and LiCo 1-x M x O 2 (where M is at least one element selected from Sn, Mg, Fe, Ti, Al, Zr, Cr, V, Ga, Zn, Cu, 0.001 ⁇ x ⁇ 0.05) , LiCo 1/3 Ni 1/3 Mn 1/3 O 2 , LiNi 1/2 Mn 3/2 O 4 , Li 2 MnO 3 and LiMO 2 (M is a transition metal such as Co, Ni, Mn, Fe) More preferred is a lithium composite metal oxide that can be used at 4.4 V or higher on the basis of Li, such as a solid solution.
- M is at least one element selected from Sn, Mg, Fe, Ti, Al, Zr, Cr, V, Ga, Zn, Cu, 0.001 ⁇ x ⁇ 0.05
- the electrochemical characteristics in a wide temperature range are likely to be deteriorated due to a reaction with the electrolyte during charging, but in the lithium secondary battery according to the present invention, these A decrease in electrochemical characteristics can be suppressed.
- the resistance of the battery tends to increase with the elution of Mn ions from the positive electrode, so that the electrochemical characteristics in a wide temperature range tend to be lowered.
- Lithium secondary batteries are preferred because they can suppress a decrease in these electrochemical characteristics.
- lithium-containing olivine-type phosphate can also be used as the positive electrode active material.
- a lithium-containing olivine-type phosphate containing at least one selected from iron, cobalt, nickel and manganese is preferable. Specific examples thereof include LiFePO 4 , LiCoPO 4 , LiNiPO 4 , LiMnPO 4 and the like. Some of these lithium-containing olivine-type phosphates may be substituted with other elements, and some of iron, cobalt, nickel, and manganese are replaced with Co, Mn, Ni, Mg, Al, B, Ti, V, and Nb.
- Cu, Zn, Mo, Ca, Sr, W and Zr can be substituted with one or more elements selected from these, or can be coated with a compound or carbon material containing these other elements.
- LiFePO 4 or LiMnPO 4 is preferable.
- mold phosphate can also be mixed with the said positive electrode active material, for example, and can be used.
- the positive electrode for lithium primary battery CuO, Cu 2 O, Ag 2 O, Ag 2 CrO 4, CuS, CuSO 4, TiO 2, TiS 2, SiO 2, SnO, V 2 O 5, V 6 O 12 , VO x , Nb 2 O 5 , Bi 2 O 3 , Bi 2 Pb 2 O 5 , Sb 2 O 3 , CrO 3 , Cr 2 O 3 , MoO 3 , WO 3 , SeO 2 , MnO 2 , Mn 2 O 3 , Fe 2 O 3 , FeO, Fe 3 O 4 , Ni 2 O 3 , NiO, CoO 3 , CoO and other oxides of one or more metal elements or chalcogen compounds, sulfur such as SO 2 and SOCl 2 Examples thereof include compounds, and fluorocarbons (fluorinated graphite) represented by the general formula (CF x ) n . Among these, MnO 2 , V 2 O 5 , graphite fluoride and the like are preferable.
- the positive electrode conductive agent is not particularly limited as long as it is an electron conductive material that does not cause a chemical change.
- Examples thereof include graphite such as natural graphite (flaky graphite and the like) and artificial graphite, carbon black such as acetylene black, ketjen black, channel black, furnace black, lamp black and thermal black. Further, graphite and carbon black may be appropriately mixed and used.
- the addition amount of the conductive agent to the positive electrode mixture is preferably 1 to 10% by mass, and particularly preferably 2 to 5% by mass.
- the positive electrode is composed of a conductive agent such as acetylene black and carbon black, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), a copolymer of styrene and butadiene (SBR), acrylonitrile and butadiene.
- a conductive agent such as acetylene black and carbon black, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), a copolymer of styrene and butadiene (SBR), acrylonitrile and butadiene.
- PTFE polytetrafluoroethylene
- PVDF polyvinylidene fluoride
- SBR styrene and butadiene
- SBR styrene and butadiene
- acrylonitrile and butadiene acrylonitrile and butadiene.
- binder such as copolymer (NBR), carb
- this positive electrode mixture was applied to a current collector aluminum foil, a stainless steel lath plate, etc., dried and pressure-molded, and then subjected to vacuum at a temperature of about 50 ° C. to 250 ° C. for about 2 hours. It can be manufactured by heat treatment.
- the density of the part except the collector of the positive electrode is usually at 1.5 g / cm 3 or more, for further increasing the capacity of the battery, it is preferably 2 g / cm 3 or more, more preferably, 3 g / cm 3 It is above, More preferably, it is 3.6 g / cm 3 or more.
- the upper limit is preferably 4 g / cm 3 or less.
- Examples of the negative electrode active material for a lithium secondary battery include lithium metal, lithium alloy, and a carbon material capable of occluding and releasing lithium (easily graphitized carbon and a (002) plane spacing of 0.37 nm or more).
- Non-graphitizable carbon, graphite with (002) plane spacing of 0.34 nm or less, etc.] tin (single), tin compound, silicon (single), silicon compound, lithium titanate such as Li 4 Ti 5 O 12 A compound etc. can be used individually by 1 type or in combination of 2 or more types.
- a highly crystalline carbon material such as artificial graphite or natural graphite in terms of the ability to occlude and release lithium ions
- the plane spacing (d 002 ) of the lattice plane ( 002 ) is 0.
- a carbon material having a graphite type crystal structure of 340 nm (nanometer) or less, particularly 0.335 to 0.337 nm.
- a mechanical action such as compression force, friction force, shear force, etc.
- the density of the portion excluding the current collector of the negative electrode can be obtained from X-ray diffraction measurement of the negative electrode sheet when pressed to a density of 1.5 g / cm 3 or more.
- the ratio I (110) / I (004) of the peak intensity I (110) of the (110) plane of the graphite crystal and the peak intensity I (004) of the (004) plane is 0.01 or more, the temperature becomes even wider.
- the highly crystalline carbon material core material
- the highly crystalline carbon material is coated with a carbon material having lower crystallinity than the core material because electrochemical characteristics in a wide temperature range are further improved.
- the crystallinity of the coating carbon material can be confirmed by TEM.
- Examples of the metal compound capable of inserting and extracting lithium as the negative electrode active material include Si, Ge, Sn, Pb, P, Sb, Bi, Al, Ga, In, Ti, Mn, Fe, Co, Ni, and Cu. , Zn, Ag, Mg, Sr, Ba, and other compounds containing at least one metal element.
- These metal compounds may be used in any form such as a simple substance, an alloy, an oxide, a nitride, a sulfide, a boride, and an alloy with lithium, but any of a simple substance, an alloy, an oxide, and an alloy with lithium. Is preferable because the capacity can be increased.
- those containing at least one element selected from Si, Ge and Sn are preferable, and those containing at least one element selected from Si and Sn are particularly preferable because the capacity of the battery can be increased.
- the negative electrode is kneaded using the same conductive agent, binder, and high-boiling solvent as in the preparation of the positive electrode described above to form a negative electrode mixture, and then this negative electrode mixture is applied to the copper foil of the current collector. After being dried and pressure-molded, it can be produced by heat treatment under vacuum at a temperature of about 50 ° C. to 250 ° C. for about 2 hours.
- the density of the portion excluding the current collector of the negative electrode is usually 1.1 g / cm 3 or more, and is preferably 1.5 g / cm 3 or more, particularly preferably 1.7 g in order to further increase the capacity of the battery. / Cm 3 or more.
- the upper limit is preferably 2 g / cm 3 or less.
- examples of the negative electrode active material for a lithium primary battery include lithium metal and lithium alloy.
- the structure of the lithium battery is not particularly limited, and a coin-type battery, a cylindrical battery, a square battery, a laminated battery, or the like having a single-layer or multi-layer separator can be applied. Although it does not restrict
- the lithium secondary battery according to the present invention has excellent electrochemical characteristics in a wide temperature range even when the end-of-charge voltage is 4.2 V or more, particularly 4.3 V or more, and the characteristics are also good at 4.4 V or more. is there.
- the end-of-discharge voltage is usually 2.8 V or more, and further 2.5 V or more, but the lithium secondary battery in the present invention can be 2.0 V or more.
- the current value is not particularly limited, but is usually used in the range of 0.1 to 30C.
- the lithium battery in the present invention can be charged and discharged at ⁇ 40 to 100 ° C., preferably ⁇ 10 to 80 ° C.
- a method of providing a safety valve on the battery lid or cutting a member such as a battery can or a gasket can be employed.
- the battery lid can be provided with a current interruption mechanism that senses the internal pressure of the battery and interrupts the current.
- the 2nd electrical storage device of this invention is an electrical storage device which stores energy using the electrical double layer capacity
- An example of the present invention is an electric double layer capacitor.
- the most typical electrode active material used for this electricity storage device is activated carbon. Double layer capacity increases roughly in proportion to surface area.
- the 3rd electrical storage device of this invention is an electrical storage device which stores energy using the dope / dedope reaction of an electrode.
- the electrode active material used in this power storage device include metal oxides such as ruthenium oxide, iridium oxide, tungsten oxide, molybdenum oxide, and copper oxide, and ⁇ -conjugated polymers such as polyacene and polythiophene derivatives. Capacitors using these electrode active materials can store energy associated with electrode doping / dedoping reactions.
- the 4th electrical storage device of this invention is an electrical storage device which stores energy using the intercalation of the lithium ion to carbon materials, such as a graphite which is a negative electrode. It is called a lithium ion capacitor (LIC).
- LIC lithium ion capacitor
- Examples of the positive electrode include those using an electric double layer between an activated carbon electrode and an electrolytic solution, and those using a ⁇ -conjugated polymer electrode doping / dedoping reaction.
- the electrolyte contains at least a lithium salt such as LiPF 6 .
- Examples 1 to 16, Comparative Examples 1 to 4 [Production of lithium ion secondary battery] LiCoO 2 ; 94% by mass, acetylene black (conducting agent); 3% by mass were mixed, and a solution in which 3% by mass of polyvinylidene fluoride (binder) was previously dissolved in 1-methyl-2-pyrrolidone was mixed. In addition, the mixture was mixed to prepare a positive electrode mixture paste. This positive electrode mixture paste was applied to one side of an aluminum foil (current collector), dried and pressurized, punched out to a predetermined size, and a positive electrode sheet was produced. The density of the portion excluding the current collector of the positive electrode was 3.6 g / cm 3 .
- the ratio of the peak intensity I (110) of the (110) plane of the graphite crystal to the peak intensity I (004) of the (004) plane [I (110) / I (004)] was 0.1.
- a positive electrode sheet, a microporous polyethylene film separator, and a negative electrode sheet were laminated in this order, and a non-aqueous electrolyte solution having the composition shown in Tables 1 to 3 was added to produce a 2032 type coin battery.
- Example 17 and Comparative Example 5 In place of the negative electrode active material used in Example 3 and Comparative Example 1, a negative electrode sheet was prepared using silicon (single element) (negative electrode active material). Silicon (simple substance): 80% by mass, acetylene black (conductive agent); 15% by mass were mixed, and polyvinylidene fluoride (binder); 5% by mass was previously dissolved in 1-methyl-2-pyrrolidone. In addition to the solution, mixing was performed to prepare a negative electrode mixture paste. This negative electrode mixture paste was applied on a copper foil (current collector), dried and pressurized, punched to a predetermined size, and a negative electrode sheet was produced. FEC was used instead of VC in the non-aqueous electrolyte. A coin battery was manufactured and evaluated in the same manner as in Example 3 and Comparative Example 1 except that was used. The results are shown in Table 2.
- Example 18 and Comparative Example 6 A positive electrode sheet was produced using LiFePO 4 (positive electrode active material) coated with amorphous carbon instead of the positive electrode active material used in Example 3 and Comparative Example 1.
- the positive electrode mixture paste was prepared by adding to and mixing with the solution previously dissolved in the mixture. This positive electrode mixture paste was applied onto an aluminum foil (current collector), dried, pressurized and punched to a predetermined size to produce a positive electrode sheet, and the end-of-charge voltage during battery evaluation was 3.
- a coin battery was prepared and evaluated in the same manner as in Example 3 and Comparative Example 1 except that the voltage was 6 V and the discharge end voltage was 2.0 V. The results are shown in Table 3.
- any of the lithium secondary batteries of Examples 1 to 16 above is a compound having an isocyanate group described in Comparative Example 1, Patent Document 1, and Patent Document 2 when no compound is added to the nonaqueous electrolytic solution of the present invention.
- the lithium secondary batteries of Comparative Examples 2 to 4 which are nonaqueous electrolytes to which is added, electrochemical characteristics in a wide temperature range are remarkably improved.
- the effect of the present invention is a characteristic effect when a specific compound of the present invention is contained in an amount of 0.001 to 10% by mass in a nonaqueous electrolytic solution in which an electrolyte salt is dissolved in a nonaqueous solvent. It has been found.
- Example 17 and Comparative Example 5 when silicon (single) Si was used for the negative electrode, or lithium-containing olivine-type iron phosphate (LiFePO 4 ) was used for the positive electrode.
- silicon (single) Si was used for the negative electrode
- lithium-containing olivine-type iron phosphate (LiFePO 4 ) was used for the positive electrode.
- LiFePO 4 lithium-containing olivine-type iron phosphate
- the non-aqueous electrolyte of the present invention has an effect of improving the discharge characteristics in a wide temperature range of the lithium primary battery.
- the nonaqueous electrolytic solution of the present invention is used, an electricity storage device having excellent electrochemical characteristics in a wide temperature range can be obtained.
- an electricity storage device capable of improving electrochemical characteristics in a wide temperature range. it can.
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Abstract
Description
特に地球温暖化防止のため、CO2排出量を削減することが急務となっており、リチウム二次電池やキャパシタなどの蓄電デバイスからなる蓄電装置を搭載した環境対応車の中でも、ハイブリッド電気自動車(HEV)、プラグインハイブリッド電気自動車(PHEV)、バッテリー電気自動車(BEV)の早期普及が求められている。自動車は移動距離が長いため、熱帯の非常に暑い地域から極寒の地域まで幅広い温度範囲の地域で使用される可能性がある。従って、特にこれらの車載用の蓄電デバイスは、高温から低温まで幅広い温度範囲で使用しても電気化学特性が劣化しないことが要求されている。
尚、本明細書において、リチウム二次電池という用語は、いわゆるリチウムイオン二次電池も含む概念として用いる。
また、負極としては、金属リチウム、リチウムを吸蔵及び放出可能な金属化合物(金属単体、酸化物、リチウムとの合金等)や炭素材料が知られており、特にリチウムを吸蔵及び放出することが可能なコークス、人造黒鉛、天然黒鉛等の炭素材料を用いたリチウム二次電池が広く実用化されている。
更に、リチウム金属やその合金、スズ又はケイ素等の金属単体や酸化物を負極材料として用いたリチウム二次電池は、初期の容量は高いもののサイクル中に微粉化が進むため、炭素材料の負極に比べて非水溶媒の還元分解が加速的に起こり、電池容量やサイクル特性のような電池性能が大きく低下することが知られている。また、これらの負極材料の微粉化や非水溶媒の分解物が蓄積すると、負極へのリチウムの吸蔵及び放出がスムーズにできなくなり、広い温度範囲での電気化学特性が低下しやすくなる。
一方、正極として、例えばLiCoO2、LiMn2O4、LiNiO2、LiFePO4等を用いたリチウム二次電池は、非水電解液中の非水溶媒が充電状態で正極材料と非水電解液との界面において、局部的に一部酸化分解することにより発生した分解物やガスが電池の望ましい電気化学的反応を阻害するため、やはり広い温度範囲での電気化学特性の低下を生じることが分かっている。
特許文献1には、不飽和結合又はハロゲン原子を有するカーボネートと共にイソシアネート基を有する特定の化合物を含有する非水電解液が提案されており、サイクル特性の向上が示唆されている。
また、特許文献2には1,6-ジイソシアナトヘキサン、イソシアナトエチルなどのジイソシアナト化合物あるいはモノイソシアナト化合物を含有する非水電解液が提案されており、サイクル特性の向上が記載されている。
そこで、本発明者らは、上記課題を解決するために鋭意研究を重ね、非水溶媒に電解質塩が溶解されている非水電解液において、非水電解液中に特定のエステル構造を有するイソシアネートを1種以上含有することで、広い温度範囲での電気化学特性、特にリチウム電池の電気化学特性を改善できることを見出し、本発明を完成した。
(1)非水溶媒に電解質塩が溶解されている非水電解液において、非水電解液中に下記一般式(I)で表されるエステル構造を有するイソシアネート化合物を1種以上含有することを特徴とする非水電解液。
本発明の非水電解液は、非水溶媒に電解質塩が溶解されている非水電解液において、非水電解液中に前記一般式(I)で表されるエステル構造(R-C(=O)-O-)を有するイソシアネートを1種以上含有することを特徴とする非水電解液である。
上記の置換基の範囲の場合に、一段と広い温度範囲での電気化学特性が向上するので好ましい。
本発明の非水電解液に使用される非水溶媒としては、環状カーボネート、鎖状エステル、ラクトン、エーテル、アミドが挙げられ、環状カーボネートのみ、又は環状カーボネートと鎖状エステルの両方が含まれることが好ましい。
なお、鎖状エステルなる用語は、鎖状カーボネートおよび鎖状カルボン酸エステルを含む概念として用いる。
環状カーボネートとしては、エチレンカーボネート(EC)、プロピレンカーボネート(PC)、1,2-ブチレンカーボネート、2,3-ブチレンカーボネート、4-フルオロ-1,3-ジオキソラン-2-オン(FEC)、トランス又はシス-4,5-ジフルオロ-1,3-ジオキソラン-2-オン(以下、両者を総称して「DFEC」という)、ビニレンカーボネート(VC)、ビニルエチレンカーボネート(VEC)、及び4-エチニル-1,3-ジオキソラン-2-オン(EEC)から選ばれる一種又は二種以上が挙げられ、エチレンカーボネート、プロピレンカーボネート、4-フルオロ-1,3-ジオキソラン-2-オン、ビニレンカーボネート及び4-エチニル-1,3-ジオキソラン-2-オン(EEC)から選ばれる一種又は二種以上がより好適である。
これらの中でも、炭素-炭素二重結合、炭素-炭素三重結合などの不飽和結合又はフッ素原子を有する環状カーボネートのうち少なくとも1種を使用すると高温充電保存後の低温負荷特性が一段と向上するので好ましく、炭素-炭素二重結合、炭素-炭素三重結合などの不飽和結合を含む環状カーボネートとフッ素原子を有する環状カーボネートを両方含むことがより好ましい。炭素-炭素二重結合、炭素-炭素三重結合などの不飽和結合を有する環状カーボネートとしては、VC、VEC、EECが更に好ましく、フッ素原子を有する環状カーボネートとしては、FEC、DFECが更に好ましい。
炭素-炭素二重結合、炭素-炭素三重結合などの不飽和結合を有する環状カーボネートの含有量は、非水溶媒の総体積に対して、好ましくは0.07体積%以上、より好ましくは0.2体積%以上、更に好ましくは0.7体積%以上、また、上限としては、好ましくは7体積%以下、より好ましくは4体積%以下、更に好ましくは2.5体積%以下含むと、低温でのLiイオン透過性を損なうことなく一段と高温保存時の被膜の安定性を増すことができるので好ましい。
フッ素原子を有する環状カーボネートの含有量は、非水溶媒の総体積に対して好ましくは0.07体積%以上、より好ましくは4体積%以上、更に好ましくは7体積%以上、また、上限としては、好ましくは35体積%以下、より好ましくは25体積%以下、更に好ましくは15体積%以下含むと、低温でのLiイオン透過性を損なうことなく一段と高温保存時の被膜の安定性を増すことができるので好ましい。
また、非水溶媒がエチレンカーボネート及び/又はプロピレンカーボネートを含むと電極上に形成される被膜の抵抗が小さくなるので好ましく、エチレンカーボネート及び/又はプロピレンカーボネートの含有量は、非水溶媒の総体積に対し、好ましくは3体積%以上、より好ましくは5体積%以上、更に好ましくは7体積%以上、また、上限としては、好ましくは45体積%以下、より好ましくは35体積%以下、更に好ましくは25体積%以下である。
また、鎖状カーボネートを用いる場合には、2種以上を用いることが好ましい。さらに対称鎖状カーボネートと非対称鎖状カーボネートの両方が含まれるとより好ましく、対称鎖状カーボネートの含有量が非対称鎖状カーボネートより多く含まれると更に好ましい。
鎖状カーボネート中に対称鎖状カーボネートが占める体積の割合は、51体積%以上が好ましく、55体積%以上がより好ましい。上限としては、95体積%以下がより好ましく、85体積%以下であると更に好ましい。対称鎖状カーボネートにジメチルカーボネートが含まれると特に好ましい。また、非対称鎖状カーボネートはメチル基を有するとより好ましく、メチルエチルカーボネートが特に好ましい。
上記の場合に一段と広い温度範囲での電気化学特性が向上するので好ましい。
その他の添加剤の具体例としては、リン酸トリメチル、リン酸トリブチル、及びリン酸トリオクチル等のリン酸エステル、アセトニトリル、プロピオニトリル、スクシノニトリル、グルタロニトリル、アジポニトリル、及びピメロニトリル等のニトリル、テトラメチレンジイソシアネート、ヘキサメチレンジイソシアネート、オクタメチレンジイソシアネート等の、前記一般式(I)で表されるエステル構造を有するイソシアネート化合物以外のイソシアネート、1,3-プロパンスルトン、1,3-ブタンスルトン、2,4-ブタンスルトン、1,4-ブタンスルトン等のスルトン化合物、エチレンサルファイト、ヘキサヒドロベンゾ[1,3,2]ジオキサチオラン-2-オキシド(1,2-シクロヘキサンジオールサイクリックサルファイトともいう)、5-ビニル-ヘキサヒドロ1,3,2-ベンゾジオキサチオール-2-オキシド等の環状サルファイト、メタンスルホン酸2-プロピニル、ブタン-1,4-ジイル ジメタンスルホネート、2-ブチン-1,4-ジイル ジメタンスルホネート、ペンタン-1,5-ジイル ジメタンスルホネート、プロパン-1,2-ジイル ジメタンスルホネート、ブタン-2,3-ジイル ジメタンスルホネート、メチレンメタンジスルホネート、2-トリフルオロメチルフェニル メタンスルホネート、ペンタフルオロフェニル メタンスルホネート、メチレンメタンジスルホネート等のスルホン酸エステル、ジビニルスルホン、1,2-ビス(ビニルスルホニル)エタン、ビス(2-ビニルスルホニルエチル)エーテル等のビニルスルホン等から選ばれるS=O結合含有化合物、無水酢酸、無水プロピオン酸等の鎖状のカルボン酸無水物、無水コハク酸、無水マレイン酸、無水グルタル酸、無水イタコン酸、3-スルホ-プロピオン酸無水物等の環状酸無水物、メトキシペンタフルオロシクロトリホスファゼン、エトキシペンタフルオロシクロトリホスファゼン、フェノキシペンタフルオロシクロトリホスファゼン、エトキシヘプタフルオロシクロテトラホスファゼンなどの環状ホスファゼン化合物、シクロヘキシルベンゼン、フルオロシクロヘキシルベンゼン化合物(1-フルオロ-2-シクロヘキシルベンゼン、1-フルオロ-3-シクロヘキシルベンゼン、1-フルオロ-4-シクロヘキシルベンゼン)、tert-ブチルベンゼン、tert-アミルベンゼン、1-フルオロ-4-tert-ブチルベンゼン等の分枝アルキル基を有する芳香族化合物や、ビフェニル、ターフェニル(o-、m-、p-体)、ジフェニルエーテル、フルオロベンゼン、ジフルオロベンゼン(o-、m-、p-体)、アニソール、2,4-ジフルオロアニソール、ターフェニルの部分水素化物(1,2-ジシクロヘキシルベンゼン、2-フェニルビシクロヘキシル、1,2-ジフェニルシクロヘキサン、o-シクロヘキシルビフェニル)等の芳香族化合物が好適に挙げられる。
本発明に使用される電解質塩としては、下記のリチウム塩、オニウム塩が好適に挙げられる。
リチウム塩としては、LiPF6、LiPO2F2、Li2PO3F、LiBF4、LiClO4等の無機リチウム塩、LiN(SO2CF3)2、LiN(SO2C2F5)2、LiCF3SO3、LiC(SO2CF3)3、LiPF4(CF3)2、LiPF3(C2F5)3、LiPF3(CF3)3、LiPF3(iso-C3F7)3、LiPF5(iso-C3F7)等の鎖状のフッ化アルキル基を含有するリチウム塩や、(CF2)2(SO2)2NLi、(CF2)3(SO2)2NLi等の環状のフッ化アルキレン鎖を有するリチウム塩、ビス[オキサレート-O,O’]ホウ酸リチウムやジフルオロ[オキサレート-O,O’]ホウ酸リチウム、ジフルオロビス[オキサレート-O,O’]リン酸リチウム及びテトラフルオロ[オキサレート-O,O’]リン酸リチウム等のオキサレート錯体をアニオンとするリチウム塩が好適に挙げられ、これらの一種または二種以上を混合して使用することができる。これらの中でも、LiPF6、LiPO2F2、Li2PO3F、LiBF4、LiN(SO2CF3)2、LiN(SO2C2F5)2、ビス[オキサレート-O,O’]ホウ酸リチウム、ジフルオロ[オキサレート-O,O’]ホウ酸リチウム、およびジフルオロビス[オキサレート-O,O’]リン酸リチウムから選ばれる少なくとも1種が好ましく、LiPF6、LiPO2F2、LiBF4、LiN(SO2CF3)2、ビス[オキサレート-O,O’]ホウ酸リチウム、およびジフルオロビス[オキサレート-O,O’]リン酸リチウムから選ばれる少なくとも1種が更に好ましい。リチウム塩の濃度は、前記の非水溶媒に対して、通常0.3M以上が好ましく、0.7M以上がより好ましく、1.1M以上が更に好ましい。またその上限は、2.5M以下が好ましく、2.0M以下がより好ましく、1.6M以下が更に好ましい。
また、これらのリチウム塩の好適な組み合わせとしては、LiPF6を含み、更にLiPO2F2、LiBF4およびLiN(SO2CF3)2から選ばれる少なくとも1種のリチウム塩が非水電解液中に含まれている場合が好ましく、LiPF6以外のリチウム塩が非水溶媒中に占める割合は、0.001M以上であると、広い温度範囲での電気化学特性を向上効果発揮されやすく、0.5M以下であると広い温度範囲での電気化学特性を向上効果が低下する懸念が少ないので好ましい。好ましくは0.01M以上、特に好ましくは0.03M以上、最も好ましくは0.04M以上である。その上限は、好ましくは0.4M以下、特に好ましくは0.2M以下である。
また、オニウム塩としては、下記に示すオニウムカチオンとアニオンを組み合わせた各種塩が好適に挙げられる。
オニウムカチオンの具体例としては、テトラメチルアンモニウムカチオン、エチルトリメチルアンモニウムカチオン、ジエチルジメチルアンモニウムカチオン、トリエチルメチルアンモニウムカチオン、テトラエチルアンモニウムカチオン、N,N-ジメチルピロリジニウムカチオン、N-エチル-N-メチルピロリジニウムカチオン、N,N-ジエチルピロリジニウムカチオン、スピロ-(N,N')-ビピロリジニウムカチオン、N,N'-ジメチルイミダゾリニウムカチオン、N-エチル-N’-メチルイミダゾリニウムカチオン、N,N'-ジエチルイミダゾリニウムカチオン、N,N'-ジメチルイミダゾリウムカチオン、N-エチル-N'-メチルイミダゾリウムカチオン、N,N'-ジエチルイミダゾリウムカチオン等が好適に挙げられる。
アニオンの具体例としては、PF6アニオン、BF4アニオン、ClO4アニオン、AsF6アニオン、CF3SO3アニオン、N(CF3SO2)2アニオン、N(C2F5SO2)2アニオン、等が好適に挙げられる。
これらの電解質塩は、1種単独で又は2種以上を組み合わせて使用することができる。
本発明の非水電解液は、例えば、前記の非水溶媒を混合し、これに前記の電解質塩及び該非水電解液に対して前記一般式(I)で表される化合物を添加することにより得ることができる。
この際、用いる非水溶媒及び非水電解液に加える化合物は、生産性を著しく低下させない範囲内で、予め精製して、不純物が極力少ないものを用いることが好ましい。
本発明のリチウム電池は、リチウム一次電池及びリチウム二次電池を総称する。また、本明細書において、リチウム二次電池という用語は、いわゆるリチウムイオン二次電池も含む概念として用いる。本発明のリチウム電池は、正極、負極及び非水溶媒に電解質塩が溶解されている前記非水電解液からなる。非水電解液以外の正極、負極等の構成部材は特に制限なく使用できる。
例えば、リチウム二次電池用正極活物質としては、コバルト、マンガン、およびニッケルから選択される1種以上を含有するリチウムとの複合金属酸化物が使用される。これらの正極活物質は、1種単独または2種以上を組み合わせて用いることができる。
このようなリチウム複合金属酸化物としては、例えば、LiCoO2、LiMn2O4、LiNiO2、LiCo1-xNixO2(0.01<x<1)、LiCo1/3Ni1/3Mn1/3O2、LiNi1/2Mn3/2O4、LiCo0.98Mg0.02O2等が挙げられる。また、LiCoO2とLiMn2O4、LiCoO2とLiNiO2、LiMn2O4とLiNiO2のように併用してもよい。
これらの中では、LiCoO2、LiMn2O4、LiNiO2のような満充電状態における正極の充電電位がLi基準で4.3V以上で使用可能なリチウム複合金属酸化物が好ましく、LiCo1-xMxO2(但し、MはSn、Mg、Fe、Ti、Al、Zr、Cr、V、Ga、Zn、Cuから選ばれる少なくとも1種類以上の元素、0.001≦x≦0.05)、LiCo1/3Ni1/3Mn1/3O2、LiNi1/2Mn3/2O4、Li2MnO3とLiMO2(Mは、Co、Ni、Mn、Feなどの遷移金属)との固溶体のようなLi基準で4.4V以上で使用可能なリチウム複合金属酸化物がより好ましい。高充電電圧で動作するリチウム複合金属酸化物を使用すると、充電時における電解液との反応により特に広い温度範囲での電気化学特性が低下しやすいが、本発明に係るリチウム二次電池ではこれらの電気化学特性の低下を抑制することができる。
特にMnを含む正極の場合に正極からのMnイオンの溶出に伴い電池の抵抗が増加しやすい傾向にあるため、広い温度範囲での電気化学特性が低下しやすい傾向にあるが、本発明に係るリチウム二次電池ではこれらの電気化学特性の低下を抑制することができるので好ましい。
これらのリチウム含有オリビン型リン酸塩の一部は他元素で置換してもよく、鉄、コバルト、ニッケル、マンガンの一部をCo、Mn、Ni、Mg、Al、B、Ti、V、Nb、Cu、Zn、Mo、Ca、Sr、W及びZr等から選ばれる1種以上の元素で置換したり、またはこれらの他元素を含有する化合物や炭素材料で被覆することもできる。これらの中では、LiFePO4またはLiMnPO4が好ましい。
また、リチウム含有オリビン型リン酸塩は、例えば前記の正極活物質と混合して用いることもできる。
正極の集電体を除く部分の密度は、通常は1.5g/cm3以上であり、電池の容量をさらに高めるため、好ましくは2g/cm3以上であり、より好ましくは、3g/cm3以上であり、更に好ましくは、3.6g/cm3以上である。なお、上限としては、4g/cm3以下が好ましい。
これらの中では、リチウムイオンの吸蔵及び放出能力において、人造黒鉛や天然黒鉛等の高結晶性の炭素材料を使用することが更に好ましく、格子面(002)の面間隔(d002)が0.340nm(ナノメータ)以下、特に0.335~0.337nmである黒鉛型結晶構造を有する炭素材料を使用することが特に好ましい。
複数の扁平状の黒鉛質微粒子が互いに非平行に集合或いは結合した塊状構造を有する人造黒鉛粒子や、例えば鱗片状天然黒鉛粒子に圧縮力、摩擦力、剪断力等の機械的作用を繰り返し与え、球形化処理を施した黒鉛粒子を用いることにより、負極の集電体を除く部分の密度を1.5g/cm3以上の密度に加圧成形したときの負極シートのX線回折測定から得られる黒鉛結晶の(110)面のピーク強度I(110)と(004)面のピーク強度I(004)の比I(110)/I(004)が0.01以上となると一段と広い温度範囲での電気化学特性が向上するので好ましく、0.05以上となることがより好ましく、0.1以上となることが更に好ましい。また、過度に処理し過ぎて結晶性が低下し電池の放電容量が低下する場合があるので、上限は0.5以下が好ましく、0.3以下がより好ましい。
また、高結晶性の炭素材料(コア材)はコア材よりも低結晶性の炭素材料によって被膜されていると、広い温度範囲での電気化学特性が一段と良好となるので好ましい。被覆の炭素材料の結晶性は、TEMにより確認することが出来る。
高結晶性の炭素材料を使用すると、充電時において非水電解液と反応し、界面抵抗の増加によって低温もしくは高温における電気化学特性を低下させる傾向があるが、本発明に係るリチウム二次電池では広い温度範囲での電気化学特性が良好となる。
負極の集電体を除く部分の密度は、通常は1.1g/cm3以上であり、電池の容量をさらに高めるため、好ましくは1.5g/cm3以上であり、特に好ましくは1.7g/cm3以上である。なお、上限としては、2g/cm3以下が好ましい。
電池用セパレータとしては、特に制限はされないが、ポリプロピレン、ポリエチレン等のポリオレフィンの単層または積層の微多孔性フィルム、織布、不織布等を使用できる。
本発明の第2の蓄電デバイスは、電解液と電極界面の電気二重層容量を利用してエネルギーを貯蔵する蓄電デバイスである。本発明の一例は、電気二重層キャパシタである。この蓄電デバイスに用いられる最も典型的な電極活物質は、活性炭である。二重層容量は概ね表面積に比例して増加する。
本発明の第3の蓄電デバイスは、電極のドープ/脱ドープ反応を利用してエネルギーを貯蔵する蓄電デバイスである。この蓄電デバイスに用いられる電極活物質として、酸化ルテニウム、酸化イリジウム、酸化タングステン、酸化モリブデン、酸化銅等の金属酸化物や、ポリアセン、ポリチオフェン誘導体等のπ共役高分子が挙げられる。これらの電極活物質を用いたキャパシタは、電極のドープ/脱ドープ反応にともなうエネルギー貯蔵が可能である。
本発明の第4の蓄電デバイスは、負極であるグラファイト等の炭素材料へのリチウムイオンのインターカレーションを利用してエネルギーを貯蔵する蓄電デバイスである。リチウムイオンキャパシタ(LIC)と呼ばれる。正極は、例えば活性炭電極と電解液との間の電気ニ重層を利用したものや、π共役高分子電極のドープ/脱ドープ反応を利用したもの等が挙げられる。電解液には少なくともLiPF6などのリチウム塩が含まれる。
〔リチウムイオン二次電池の作製〕
LiCoO2;94質量%、アセチレンブラック(導電剤);3質量%を混合し、予めポリフッ化ビニリデン(結着剤);3質量%を1-メチル-2-ピロリドンに溶解させておいた溶液に加えて混合し、正極合剤ペーストを調製した。この正極合剤ペーストをアルミニウム箔(集電体)上の片面に塗布し、乾燥、加圧処理して所定の大きさに打ち抜き、正極シートを作製した。正極の集電体を除く部分の密度は3.6g/cm3であった。また、人造黒鉛(d002=0.335nm、負極活物質)95質量%を、予めポリフッ化ビニリデン(結着剤)5質量%を1-メチル-2-ピロリドンに溶解させておいた溶液に加えて混合し、負極合剤ペーストを調製した。この負極合剤ペーストを銅箔(集電体)上の片面に塗布し、乾燥、加圧処理して所定の大きさに打ち抜き負極シートを作製した。負極の集電体を除く部分の密度は1.5g/cm3であった。また、この電極シートを用いてX線回折測定した結果、黒鉛結晶の(110)面のピーク強度I(110)と(004)面のピーク強度I(004)の比〔I(110)/I(004)〕は0.1であった。そして、正極シート、微多孔性ポリエチレンフィルム製セパレータ、負極シートの順に積層し、表1~3に記載の組成の非水電解液を加えて、2032型コイン電池を作製した。
<初期の放電容量>
上記の方法で作製したコイン電池を用いて、25℃の恒温槽中、1Cの定電流及び定電圧で、終止電圧4.2Vまで3時間充電し、0℃に恒温槽の温度を下げ、1Cの定電流下終止電圧2.75Vまで放電して、初期の0℃の放電容量を求めた。
<高温充電保存試験>
次に、このコイン電池を85℃の恒温槽中、1Cの定電流及び定電圧で終止電圧4.2Vまで3時間充電し、85℃の恒温槽中において、4.2Vに保持した状態で3日間保存を行った。その後、25℃の恒温槽に入れ、一旦1Cの定電流下終止電圧2.75Vまで放電した。
<高温充電保存後の放電容量>
更にその後、初期の放電容量の測定と同様にして、高温充電保存後の0℃の放電容量を求めた。
<高温充電保存後の低温特性>
高温充電保存後の低温特性を下記の0℃放電容量の維持率より求めた。
高温充電保存後の0℃放電容量維持率(%)=(高温充電保存後の0℃の放電容量/初期の0℃の放電容量)×100
電池特性を表1に示す。
実施例3および比較例1で用いた負極活物質に変えて、ケイ素(単体)(負極活物質)を用いて、負極シートを作製した。ケイ素(単体);80質量%、アセチレンブラック(導電剤);15質量%を混合し、予めポリフッ化ビニリデン(結着剤);5質量%を1-メチル-2-ピロリドンに溶解させておいた溶液に加えて混合し、負極合剤ペーストを調製した。この負極合剤ペーストを銅箔(集電体)上に塗布し、乾燥、加圧処理して所定の大きさに打ち抜き、負極シートを作製したこと、非水電解液中のVCの代わりにFECを用いたことの他は、実施例3および比較例1と同様にコイン電池を作製し、電池評価を行った。結果を表2に示す。
実施例3および比較例1で用いた正極活物質に変えて、非晶質炭素で被覆されたLiFePO4(正極活物質)を用いて、正極シートを作製した。非晶質炭素で被覆されたLiFePO4;90質量%、アセチレンブラック(導電剤);5質量%を混合し、予めポリフッ化ビニリデン(結着剤);5質量%を1-メチル-2-ピロリドンに溶解させておいた溶液に加えて混合し、正極合剤ペーストを調製した。この正極合剤ペーストをアルミニウム箔(集電体)上に塗布し、乾燥、加圧処理して所定の大きさに打ち抜き、正極シートを作製したこと、電池評価の際の充電終止電圧を3.6V、放電終止電圧を2.0Vとしたことの他は、実施例3および比較例1と同様にコイン電池を作製し、電池評価を行った。結果を表3に示す。
また、実施例17と比較例5の対比、実施例18と比較例6の対比から、負極にケイ素(単体)Siを用いた場合や、正極にリチウム含有オリビン型リン酸鉄塩(LiFePO4)を用いた場合にも同様な効果がみられる。従って、本発明の効果は、特定の正極や負極に依存した効果でないことは明らかである。
Claims (17)
- 非水溶媒に電解質塩が溶解されている非水電解液において、非水電解液中に下記一般式(I)で表されるエステル構造を有するイソシアネート化合物を1種以上含有することを特徴とする非水電解液。
- 前記一般式(I)で表される化合物の含有量が非水電解液中に0.001~10質量%である請求項1に記載の非水電解液。
- 前記一般式(I)で表される化合物中のRが、少なくとも一つの水素原子がハロゲン原子で置換されていてもよい炭素数1~6のアルキル基、または炭素数2~6のアルケニル基である請求項1または2に記載の非水電解液。
- 前記一般式(I)で表される化合物中のXが、少なくとも一つの水素原子がハロゲン原子で置換されても良い炭素数1~6の直鎖または分枝のアルキレン基である請求項1~3のいずれかに記載の非水電解液。
- 前記一般式(I)で表される化合物中のRが、炭素数2~6のアルケニル基であり、Xが、炭素数1~6の直鎖のアルキレン基である請求項3または4に記載の非水電解液。
- 前記一般式(I)で表される化合物が、2-イソシアナトエチル アクリレート、2-イソシアナトエチル メタクリレート、2-イソシアナトエチル クロトネート、2-(2-イソシアナトエトキシ)エチル アクリレート、2-(2-イソシアナトエトキシ)エチル メタクリレート、2-(2-イソシアナトエトキシ)エチル クロトネート、ビス(2-イソシアナトエチル)カーボネートから選ばれる1種又は2種以上である請求項1に記載の非水電解液。
- 前記非水溶媒が、環状カーボネートと鎖状エステルとを含有する請求項1~6のいずれかに記載の非水電解液。
- 前記環状カーボネートが、ビニレンカーボネート、ビニルエチレンカーボネート、および4-エチニル-1,3-ジオキソラン-2-オンから選ばれる不飽和結合を有する環状カーボネート、4-フルオロ-1,3-ジオキソラン-2-オン及びトランスもしくはシス-4,5-ジフルオロ-1,3-ジオキソラン-2-オンから選ばれるフッ素原子を有する環状カーボネート、エチレンカーボネート、プロピレンカーボネート、1,2-ブチレンカーボネート、並びに2,3-ブチレンカーボネート、のいずれか1種以上である、請求項7に記載の非水電解液。
- 前記環状カーボネートが、炭素-炭素二重結合、または炭素-炭素三重結合である不飽和結合を有する環状カーボネートおよびフッ素原子を有する環状カーボネートそれぞれ1種以上を含有することを特徴とする請求項7に記載の非水電解液。
- 前記鎖状エステルが、メチルエチルカーボネート、メチルプロピルカーボネート、メチルイソプロピルカーボネート、メチルブチルカーボネート、及びエチルプロピルカーボネートから選ばれる非対称鎖状カーボネート、ジメチルカーボネート、ジエチルカーボネート、ジプロピルカーボネート、及びジブチルカーボネートから選ばれる対称鎖状カーボネート、及び鎖状カルボン酸エステルから選ばれる1種又は2種以上である、請求項7に記載の非水電解液。
- 前記非水電解液中に、ニトリル化合物およびスルトン化合物から選択される少なくとも1種をさらに含有することを特徴とする請求項1~10のいずれかに記載の非水電解液。
- 前記電解質塩が、リチウム塩またはオニウム塩である請求項1~11のいずれかに記載の非水電解液。
- 電解質塩が、LiPF6、LiPO2F2、Li2PO3F、LiBF4、LiN(SO2CF3)2、LiN(SO2C2F5)2、LiN(SO2F)2、ジフルオロビス[オキサレート-O,O’]リン酸リチウム、及びテトラフルオロ[オキサレート-O,O’]リン酸リチウムから選ばれる1種又は2種以上を含む、請求項1~12のいずれかに記載の非水電解液。
- 電解質塩の濃度が、非水溶媒に対して、0.3~2.5Mである、請求項1~13のいずれかに記載の非水電解液。
- 正極、負極及び非水溶媒に電解質塩が溶解されている非水電解液を備えた蓄電デバイスにおいて、該非水電解液が請求項1~14のいずれかに記載の非水電解液であることを特徴とする蓄電デバイス。
- 前記正極が、正極活物質として、リチウム複合金属酸化物およびリチウム含有オリビン型リン酸塩から選択される少なくとも1種を含む請求項15に記載の蓄電デバイス。
- 前記負極が、負極活物質として、リチウム金属、リチウム合金、リチウムを吸蔵および放出可能な炭素材料、ならびに、リチウムを吸蔵および放出可能な金属化合物から選択される少なくとも1種を含む請求項15または16に記載の蓄電デバイス。
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WO2014112026A1 (ja) * | 2013-01-15 | 2014-07-24 | パナソニック株式会社 | リチウム二次電池 |
JPWO2014112026A1 (ja) * | 2013-01-15 | 2017-01-19 | パナソニックIpマネジメント株式会社 | リチウム二次電池 |
WO2015030190A1 (ja) * | 2013-08-30 | 2015-03-05 | 宇部興産株式会社 | 蓄電デバイス用非水電解液 |
JP2015049967A (ja) * | 2013-08-30 | 2015-03-16 | 株式会社カネカ | 非水電解質二次電池およびその組電池 |
JPWO2015030190A1 (ja) * | 2013-08-30 | 2017-03-02 | 宇部興産株式会社 | 蓄電デバイス用非水電解液 |
WO2015111612A1 (ja) * | 2014-01-24 | 2015-07-30 | 三洋化成工業株式会社 | 二次電池用添加剤、それを用いた電極及び電解液、リチウムイオン電池並びにリチウムイオンキャパシタ |
JP2019109997A (ja) * | 2017-12-18 | 2019-07-04 | 三菱ケミカル株式会社 | 非水系電解液、及びそれを用いた非水系電解液二次電池 |
WO2022168845A1 (ja) * | 2021-02-08 | 2022-08-11 | 株式会社Gsユアサ | 非水電解質蓄電素子、及び蓄電装置 |
WO2023008569A1 (ja) * | 2021-07-29 | 2023-02-02 | 昭和電工マテリアルズ株式会社 | 電気化学デバイス、電解液、及び電解液に用いられる添加剤 |
WO2023190335A1 (ja) * | 2022-03-30 | 2023-10-05 | 株式会社レゾナック | 電気化学デバイス及び電気化学デバイス用電解液 |
WO2023190363A1 (ja) * | 2022-03-30 | 2023-10-05 | 株式会社レゾナック | 電気化学デバイス及び電気化学デバイス用電解液 |
WO2024043271A1 (ja) * | 2022-08-24 | 2024-02-29 | パナソニックIpマネジメント株式会社 | リチウム一次電池 |
WO2024043272A1 (ja) * | 2022-08-24 | 2024-02-29 | パナソニックIpマネジメント株式会社 | リチウム一次電池 |
CN115842165A (zh) * | 2022-11-18 | 2023-03-24 | 广州天赐高新材料股份有限公司 | 一种电解液添加剂、电解液、锂二次电池 |
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US20140287325A1 (en) | 2014-09-25 |
CN103891033A (zh) | 2014-06-25 |
JPWO2013058224A1 (ja) | 2015-04-02 |
KR20140083031A (ko) | 2014-07-03 |
US9583788B2 (en) | 2017-02-28 |
EP2770571B1 (en) | 2016-11-30 |
IN2014CN03536A (ja) | 2015-09-04 |
JP5979150B2 (ja) | 2016-08-24 |
EP2770571A4 (en) | 2015-09-30 |
CA2852625A1 (en) | 2013-04-25 |
CN103891033B (zh) | 2016-02-10 |
EP2770571A1 (en) | 2014-08-27 |
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