WO2020246580A1 - アルカリ金属イオン二次電池用電解液、アルカリ金属イオン二次電池及びモジュール - Google Patents
アルカリ金属イオン二次電池用電解液、アルカリ金属イオン二次電池及びモジュール Download PDFInfo
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- WO2020246580A1 WO2020246580A1 PCT/JP2020/022278 JP2020022278W WO2020246580A1 WO 2020246580 A1 WO2020246580 A1 WO 2020246580A1 JP 2020022278 W JP2020022278 W JP 2020022278W WO 2020246580 A1 WO2020246580 A1 WO 2020246580A1
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- WO
- WIPO (PCT)
- Prior art keywords
- group
- carbonate
- anhydride
- alkali metal
- fluorinated
- Prior art date
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- 239000008151 electrolyte solution Substances 0.000 title claims abstract description 144
- 229910001413 alkali metal ion Inorganic materials 0.000 title claims abstract description 52
- -1 transition metal phosphoric acid compound Chemical class 0.000 claims abstract description 219
- 150000001875 compounds Chemical class 0.000 claims abstract description 96
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 46
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 40
- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 25
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 23
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Substances OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 23
- 150000003624 transition metals Chemical class 0.000 claims abstract description 20
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 14
- 239000010439 graphite Substances 0.000 claims abstract description 14
- 239000002210 silicon-based material Substances 0.000 claims abstract description 11
- 239000011366 tin-based material Substances 0.000 claims abstract description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 74
- 229910052751 metal Inorganic materials 0.000 claims description 59
- 239000002184 metal Substances 0.000 claims description 59
- 239000003792 electrolyte Substances 0.000 claims description 39
- 229910052719 titanium Inorganic materials 0.000 claims description 32
- 229910052708 sodium Inorganic materials 0.000 claims description 29
- 229910052802 copper Inorganic materials 0.000 claims description 25
- 229910052700 potassium Inorganic materials 0.000 claims description 25
- 229910052782 aluminium Inorganic materials 0.000 claims description 24
- 229910052742 iron Inorganic materials 0.000 claims description 24
- 229910052804 chromium Inorganic materials 0.000 claims description 22
- 229910052759 nickel Inorganic materials 0.000 claims description 22
- 229910052720 vanadium Inorganic materials 0.000 claims description 21
- 229910052796 boron Inorganic materials 0.000 claims description 20
- 229910052710 silicon Inorganic materials 0.000 claims description 19
- 239000011135 tin Substances 0.000 claims description 18
- 239000002905 metal composite material Substances 0.000 claims description 17
- 229910052718 tin Inorganic materials 0.000 claims description 17
- 229910052725 zinc Inorganic materials 0.000 claims description 16
- 229910052733 gallium Inorganic materials 0.000 claims description 15
- 229910052749 magnesium Inorganic materials 0.000 claims description 14
- 229910052732 germanium Inorganic materials 0.000 claims description 13
- 229910052791 calcium Inorganic materials 0.000 claims description 12
- 229910052738 indium Inorganic materials 0.000 claims description 12
- 229910052712 strontium Inorganic materials 0.000 claims description 12
- 229910052748 manganese Inorganic materials 0.000 claims description 11
- 229910052789 astatine Inorganic materials 0.000 claims description 9
- 239000003513 alkali Substances 0.000 abstract description 2
- 150000004696 coordination complex Chemical class 0.000 abstract 1
- 229910052731 fluorine Inorganic materials 0.000 description 146
- 125000000217 alkyl group Chemical group 0.000 description 144
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 114
- 125000004432 carbon atom Chemical group C* 0.000 description 86
- 150000005676 cyclic carbonates Chemical class 0.000 description 85
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- 239000011737 fluorine Substances 0.000 description 84
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- 230000000694 effects Effects 0.000 description 37
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- 230000007423 decrease Effects 0.000 description 35
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- 125000002947 alkylene group Chemical group 0.000 description 33
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 30
- 239000007773 negative electrode material Substances 0.000 description 30
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 27
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- 229910052739 hydrogen Inorganic materials 0.000 description 17
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 17
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 16
- 229910019142 PO4 Inorganic materials 0.000 description 16
- 239000011651 chromium Substances 0.000 description 16
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- 125000000524 functional group Chemical group 0.000 description 16
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- 125000003342 alkenyl group Chemical group 0.000 description 13
- 230000001965 increasing effect Effects 0.000 description 13
- 238000002360 preparation method Methods 0.000 description 13
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- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 12
- 238000007254 oxidation reaction Methods 0.000 description 12
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- 229910013075 LiBF Inorganic materials 0.000 description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 11
- 239000000654 additive Substances 0.000 description 11
- 238000009835 boiling Methods 0.000 description 11
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 11
- 230000003647 oxidation Effects 0.000 description 11
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 11
- 125000001494 2-propynyl group Chemical group [H]C#CC([H])([H])* 0.000 description 10
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- MZCLOMFORDKGLH-UHFFFAOYSA-N cyclopent-3-ene-1-carbonyl cyclopent-3-ene-1-carboxylate Chemical class C1C=CCC1C(=O)OC(=O)C1CC=CC1 MZCLOMFORDKGLH-UHFFFAOYSA-N 0.000 description 1
- SVPZJHKVRMRREG-UHFFFAOYSA-N cyclopentanecarbonitrile Chemical compound N#CC1CCCC1 SVPZJHKVRMRREG-UHFFFAOYSA-N 0.000 description 1
- CYKMNXREFBTNHG-UHFFFAOYSA-N cyclopentanecarbonyl cyclohexanecarboxylate Chemical group C1CCCC1C(=O)OC(=O)C1CCCCC1 CYKMNXREFBTNHG-UHFFFAOYSA-N 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- ANSXAPJVJOKRDJ-UHFFFAOYSA-N furo[3,4-f][2]benzofuran-1,3,5,7-tetrone Chemical compound C1=C2C(=O)OC(=O)C2=CC2=C1C(=O)OC2=O ANSXAPJVJOKRDJ-UHFFFAOYSA-N 0.000 description 1
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- 238000007429 general method Methods 0.000 description 1
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- 239000010931 gold Substances 0.000 description 1
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- 239000011307 graphite pitch Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- YVXHZKKCZYLQOP-UHFFFAOYSA-N hept-1-yne Chemical compound CCCCCC#C YVXHZKKCZYLQOP-UHFFFAOYSA-N 0.000 description 1
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- 125000000623 heterocyclic group Chemical group 0.000 description 1
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- OUKGMSINNZGXLT-UHFFFAOYSA-N hex-5-ynylbenzene Chemical compound C#CCCCCC1=CC=CC=C1 OUKGMSINNZGXLT-UHFFFAOYSA-N 0.000 description 1
- MUTGBJKUEZFXGO-UHFFFAOYSA-N hexahydrophthalic anhydride Chemical compound C1CCCC2C(=O)OC(=O)C21 MUTGBJKUEZFXGO-UHFFFAOYSA-N 0.000 description 1
- OMMLUKLXGSRPHK-UHFFFAOYSA-N hexamethylethane Natural products CC(C)(C)C(C)(C)C OMMLUKLXGSRPHK-UHFFFAOYSA-N 0.000 description 1
- YAPPHJBROGJEPD-UHFFFAOYSA-N hexane-1,3,5-tricarbonitrile Chemical compound N#CC(C)CC(C#N)CCC#N YAPPHJBROGJEPD-UHFFFAOYSA-N 0.000 description 1
- AILKHAQXUAOOFU-UHFFFAOYSA-N hexanenitrile Chemical compound CCCCCC#N AILKHAQXUAOOFU-UHFFFAOYSA-N 0.000 description 1
- RQSINLZXJXXKOH-UHFFFAOYSA-N hexyl 2,2-dimethylpropanoate Chemical compound CCCCCCOC(=O)C(C)(C)C RQSINLZXJXXKOH-UHFFFAOYSA-N 0.000 description 1
- ANJPRQPHZGHVQB-UHFFFAOYSA-N hexyl isocyanate Chemical compound CCCCCCN=C=O ANJPRQPHZGHVQB-UHFFFAOYSA-N 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
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- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical class [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- QWTDNUCVQCZILF-UHFFFAOYSA-N iso-pentane Natural products CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- JSLCOZYBKYHZNL-UHFFFAOYSA-N isobutyric acid butyl ester Natural products CCCCOC(=O)C(C)C JSLCOZYBKYHZNL-UHFFFAOYSA-N 0.000 description 1
- LRDFRRGEGBBSRN-UHFFFAOYSA-N isobutyronitrile Chemical compound CC(C)C#N LRDFRRGEGBBSRN-UHFFFAOYSA-N 0.000 description 1
- 125000001261 isocyanato group Chemical group *N=C=O 0.000 description 1
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 1
- LAQPNDIUHRHNCV-UHFFFAOYSA-N isophthalonitrile Chemical compound N#CC1=CC=CC(C#N)=C1 LAQPNDIUHRHNCV-UHFFFAOYSA-N 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 229940024423 isopropyl isobutyrate Drugs 0.000 description 1
- QHDRKFYEGYYIIK-UHFFFAOYSA-N isovaleronitrile Chemical compound CC(C)CC#N QHDRKFYEGYYIIK-UHFFFAOYSA-N 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 239000006233 lamp black Substances 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 description 1
- VRQMRGCRRPGZNH-UHFFFAOYSA-M lithium 2,2,2-trifluoroethyl sulfate Chemical compound S(=O)(=O)(OCC(F)(F)F)[O-].[Li+] VRQMRGCRRPGZNH-UHFFFAOYSA-M 0.000 description 1
- HSZCZNFXUDYRKD-UHFFFAOYSA-M lithium iodide Inorganic materials [Li+].[I-] HSZCZNFXUDYRKD-UHFFFAOYSA-M 0.000 description 1
- RSNHXDVSISOZOB-UHFFFAOYSA-N lithium nickel Chemical compound [Li].[Ni] RSNHXDVSISOZOB-UHFFFAOYSA-N 0.000 description 1
- IHLVCKWPAMTVTG-UHFFFAOYSA-N lithium;carbanide Chemical class [Li+].[CH3-] IHLVCKWPAMTVTG-UHFFFAOYSA-N 0.000 description 1
- IGILRSKEFZLPKG-UHFFFAOYSA-M lithium;difluorophosphinate Chemical compound [Li+].[O-]P(F)(F)=O IGILRSKEFZLPKG-UHFFFAOYSA-M 0.000 description 1
- CUONGYYJJVDODC-UHFFFAOYSA-N malononitrile Chemical compound N#CCC#N CUONGYYJJVDODC-UHFFFAOYSA-N 0.000 description 1
- 229910001437 manganese ion Inorganic materials 0.000 description 1
- AMWRITDGCCNYAT-UHFFFAOYSA-L manganese oxide Inorganic materials [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 1
- 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 1
- 239000002609 medium Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- RBQRWNWVPQDTJJ-UHFFFAOYSA-N methacryloyloxyethyl isocyanate Chemical compound CC(=C)C(=O)OCCN=C=O RBQRWNWVPQDTJJ-UHFFFAOYSA-N 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- UZKWTJUDCOPSNM-UHFFFAOYSA-N methoxybenzene Substances CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 1
- GBPVMEKUJUKTBA-UHFFFAOYSA-N methyl 2,2,2-trifluoroethyl carbonate Chemical class COC(=O)OCC(F)(F)F GBPVMEKUJUKTBA-UHFFFAOYSA-N 0.000 description 1
- JMKJCPUVEMZGEC-UHFFFAOYSA-N methyl 2,2,3,3,3-pentafluoropropanoate Chemical compound COC(=O)C(F)(F)C(F)(F)F JMKJCPUVEMZGEC-UHFFFAOYSA-N 0.000 description 1
- CSSYKHYGURSRAZ-UHFFFAOYSA-N methyl 2,2-difluoroacetate Chemical compound COC(=O)C(F)F CSSYKHYGURSRAZ-UHFFFAOYSA-N 0.000 description 1
- CTSAXXHOGZNKJR-UHFFFAOYSA-N methyl 2-diethoxyphosphorylacetate Chemical compound CCOP(=O)(OCC)CC(=O)OC CTSAXXHOGZNKJR-UHFFFAOYSA-N 0.000 description 1
- SIGOIUCRXKUEIG-UHFFFAOYSA-N methyl 2-dimethoxyphosphorylacetate Chemical compound COC(=O)CP(=O)(OC)OC SIGOIUCRXKUEIG-UHFFFAOYSA-N 0.000 description 1
- WQXSWJFFBKZPPJ-UHFFFAOYSA-N methyl 2-methylbut-3-yn-2-yl carbonate Chemical compound COC(=O)OC(C)(C)C#C WQXSWJFFBKZPPJ-UHFFFAOYSA-N 0.000 description 1
- PMGBATZKLCISOD-UHFFFAOYSA-N methyl 3,3,3-trifluoropropanoate Chemical compound COC(=O)CC(F)(F)F PMGBATZKLCISOD-UHFFFAOYSA-N 0.000 description 1
- RVNWLMWNUJPCQD-UHFFFAOYSA-N methyl 4,4,4-trifluorobutanoate Chemical compound COC(=O)CCC(F)(F)F RVNWLMWNUJPCQD-UHFFFAOYSA-N 0.000 description 1
- 229940095102 methyl benzoate Drugs 0.000 description 1
- QPXDTULTYTZDQM-UHFFFAOYSA-N methyl bis(2,2,2-trifluoroethyl) phosphate Chemical compound FC(F)(F)COP(=O)(OC)OCC(F)(F)F QPXDTULTYTZDQM-UHFFFAOYSA-N 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- OIGSXRLVIQGTAV-UHFFFAOYSA-N methyl ethenesulfonate Chemical compound COS(=O)(=O)C=C OIGSXRLVIQGTAV-UHFFFAOYSA-N 0.000 description 1
- MBXNQZHITVCSLJ-UHFFFAOYSA-N methyl fluorosulfonate Chemical compound COS(F)(=O)=O MBXNQZHITVCSLJ-UHFFFAOYSA-N 0.000 description 1
- MBABOKRGFJTBAE-UHFFFAOYSA-N methyl methanesulfonate Chemical compound COS(C)(=O)=O MBABOKRGFJTBAE-UHFFFAOYSA-N 0.000 description 1
- YOVQDZPAVARTTR-UHFFFAOYSA-N methyl n-(oxomethylidene)carbamate Chemical compound COC(=O)N=C=O YOVQDZPAVARTTR-UHFFFAOYSA-N 0.000 description 1
- YSCIQDMNRZWRIT-UHFFFAOYSA-N methyl n-(oxomethylidene)sulfamate Chemical compound COS(=O)(=O)N=C=O YSCIQDMNRZWRIT-UHFFFAOYSA-N 0.000 description 1
- DUGDVPXCHOVCOS-UHFFFAOYSA-N methyl prop-2-ene-1-sulfonate Chemical compound COS(=O)(=O)CC=C DUGDVPXCHOVCOS-UHFFFAOYSA-N 0.000 description 1
- RCIJMMSZBQEWKW-UHFFFAOYSA-N methyl propan-2-yl carbonate Chemical compound COC(=O)OC(C)C RCIJMMSZBQEWKW-UHFFFAOYSA-N 0.000 description 1
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- SWVGZFQJXVPIKM-UHFFFAOYSA-N n,n-bis(methylamino)propan-1-amine Chemical compound CCCN(NC)NC SWVGZFQJXVPIKM-UHFFFAOYSA-N 0.000 description 1
- ALCLRMCZPYNXKM-UHFFFAOYSA-N n,n-diethyl-2,4,4,6,6-pentafluoro-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-trien-2-amine Chemical compound CCN(CC)P1(F)=NP(F)(F)=NP(F)(F)=N1 ALCLRMCZPYNXKM-UHFFFAOYSA-N 0.000 description 1
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 229910000319 transition metal phosphate Inorganic materials 0.000 description 1
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 1
- 150000003628 tricarboxylic acids Chemical class 0.000 description 1
- AJSTXXYNEIHPMD-UHFFFAOYSA-N triethyl borate Chemical compound CCOB(OCC)OCC AJSTXXYNEIHPMD-UHFFFAOYSA-N 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- BDZBKCUKTQZUTL-UHFFFAOYSA-N triethyl phosphite Chemical compound CCOP(OCC)OCC BDZBKCUKTQZUTL-UHFFFAOYSA-N 0.000 description 1
- GGUBFICZYGKNTD-UHFFFAOYSA-N triethyl phosphonoacetate Chemical compound CCOC(=O)CP(=O)(OCC)OCC GGUBFICZYGKNTD-UHFFFAOYSA-N 0.000 description 1
- ZMANZCXQSJIPKH-UHFFFAOYSA-O triethylammonium ion Chemical compound CC[NH+](CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-O 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- 125000001889 triflyl group Chemical group FC(F)(F)S(*)(=O)=O 0.000 description 1
- NDZWKTKXYOWZML-UHFFFAOYSA-N trilithium;difluoro oxalate;borate Chemical compound [Li+].[Li+].[Li+].[O-]B([O-])[O-].FOC(=O)C(=O)OF NDZWKTKXYOWZML-UHFFFAOYSA-N 0.000 description 1
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- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 1
- CYTQBVOFDCPGCX-UHFFFAOYSA-N trimethyl phosphite Chemical compound COP(OC)OC CYTQBVOFDCPGCX-UHFFFAOYSA-N 0.000 description 1
- 229920000685 trimethylsilyl polyphosphate Polymers 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- ZFEAYIKULRXTAR-UHFFFAOYSA-M triphenylsulfanium;chloride Chemical compound [Cl-].C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 ZFEAYIKULRXTAR-UHFFFAOYSA-M 0.000 description 1
- QJMMCGKXBZVAEI-UHFFFAOYSA-N tris(trimethylsilyl) phosphate Chemical compound C[Si](C)(C)OP(=O)(O[Si](C)(C)C)O[Si](C)(C)C QJMMCGKXBZVAEI-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 229910001456 vanadium ion Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- 239000011800 void material Substances 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
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Definitions
- the present disclosure relates to an electrolytic solution for an alkali metal ion secondary battery, an alkali metal ion secondary battery and a module.
- the secondary battery examples include lead batteries, Nikkado batteries, nickel hydrogen batteries, alkali metal ion batteries (for example, lithium ion batteries), and the lithium ion batteries have a high density per unit volume / weight and output. Since it can be increased, its demand has increased rapidly. In these various batteries, the performance of the electrolytic solution has a great influence on the performance of the battery.
- Patent Document 1 is an electrolytic solution for a lithium secondary battery using Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 as a positive electrode active material, and is a lithium salt, an organic solvent, and a specific electrolyte.
- An electrolytic solution for a lithium secondary battery containing an organic fluorinated ether compound is disclosed.
- Patent Document 2 is an electrolytic solution for an alkali metal-sulfur-based secondary battery including a positive electrode containing a carbon composite material containing a carbon material and a positive electrode active material containing sulfur, and is a fluorinated ether having a specific structure. Discloses an electrolytic solution characterized by containing.
- Non-Patent Document 1 discloses that an electrolytic solution containing a specific fluoroalkyl ether is used in a lithium ion battery using LiNi 0.5 Mn 1.5 O 4 for the positive electrode.
- An object of the present disclosure is to provide an electrolytic solution for an alkali metal ion secondary battery, an alkali metal ion secondary battery, and a module including the same, which can improve cycle characteristics and rate characteristics.
- the present disclosure is an electrolytic solution for an alkali metal ion secondary battery including a positive electrode and a negative electrode.
- the positive electrode contains at least one selected from the group consisting of an alkali metal-containing transition metal composite oxide and an alkali metal-containing transition metal phosphoric acid compound.
- the negative electrode contains at least one selected from the group consisting of graphite, silicon-based materials, tin-based materials, and alkali metal-containing metal composite oxide materials.
- the electrolytic solution is a compound represented by the following formula (1) and / or a compound represented by the following formula (2).
- the present invention relates to an electrolytic solution for an alkali metal ion secondary battery, which is characterized by containing.
- the alkali metal-containing transition metal composite oxide is at least one selected from the group consisting of a compound represented by the following formula (3-1) and a compound represented by the following formula (3-4). preferable.
- MaMn 2-b M 1 b O 4 (3-1) (In the formula, M is at least one metal selected from the group consisting of Li, Na and K; 0.9 ⁇ a; 0 ⁇ b ⁇ 1.5; M 1 is Fe, Co, Ni, At least one metal selected from the group consisting of Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca, Sr, B, Ga, In, Si and Ge) MNi h Co i Mn j M 5 k O 2 (3-4) (In the formula, M is at least one metal selected from the group consisting of Li, Na and K, and M 5 is Fe, Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca, At least one selected from the group consisting of Sr, B, Ga, In, Si and Ge is
- the alkali metal-containing transition metal phosphoric acid compound is preferably a compound represented by the following formula (4).
- Me M 4 f (PO 4 ) g (4) (In the formula, M is at least one metal selected from the group consisting of Li, Na and K, and M 4 is selected from the group consisting of V, Ti, Cr, Mn, Fe, Co, Ni and Cu. 0.5 ⁇ e ⁇ 3, 1 ⁇ f ⁇ 2, 1 ⁇ g ⁇ 3)
- the present disclosure is an alkali metal ion secondary battery including a positive electrode, a negative electrode, and an electrolytic solution.
- the positive electrode contains at least one selected from the group consisting of an alkali metal-containing transition metal composite oxide and an alkali metal-containing transition metal phosphoric acid compound.
- the negative electrode contains at least one selected from the group consisting of graphite, silicon-based materials, tin-based materials, and alkali metal-containing metal composite oxide materials.
- the electrolytic solution is a compound represented by the following formula (1) and / or a compound represented by the following formula (2).
- the present invention relates to an alkali metal ion secondary battery characterized by containing.
- the alkali metal-containing transition metal composite oxide is at least one selected from the group consisting of a compound represented by the following formula (3-1) and a compound represented by the following formula (3-4). preferable.
- MaMn 2-b M 1 b O 4 (3-1) (In the formula, M is at least one metal selected from the group consisting of Li, Na and K; 0.9 ⁇ a; 0 ⁇ b ⁇ 1.5; M 1 is Fe, Co, Ni, At least one metal selected from the group consisting of Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca, Sr, B, Ga, In, Si and Ge) MNi h Co i Mn j M 5 k O 2 (3-4) (In the formula, M is at least one metal selected from the group consisting of Li, Na and K, and M 5 is Fe, Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca, At least one selected from the group consisting of Sr, B, Ga, In, Si and Ge is
- M is at least one metal selected from the group consisting of Li, Na and K, and M 4 is selected from the group consisting of V, Ti, Cr, Mn, Fe, Co, Ni and Cu. 0.5 ⁇ e ⁇ 3, 1 ⁇ f ⁇ 2, 1 ⁇ g ⁇ 3)
- the negative electrode preferably contains a silicon-based material.
- the present disclosure is also a module characterized by including the above-mentioned alkali metal ion secondary battery.
- the present disclosure can provide an electrolytic solution capable of improving cycle characteristics and rate characteristics.
- the alkali metal ion secondary battery using the electrolytic solution of the present disclosure has a good battery output.
- the present disclosure relates to an electrolytic solution for use in an alkali metal ion secondary battery.
- carbon materials such as graphite are often used as the negative electrode active material of alkali metal ion secondary batteries, and in recent years, alloys such as Si, SiO, and Sn, which have larger discharge capacities, are used to increase the energy density.
- alloys such as Si, SiO, and Sn, which have larger discharge capacities, are used to increase the energy density.
- Many active materials are also being studied.
- the fluorinated ether has a high oxidation potential and a low viscosity, it is a stable component that is unlikely to be oxidatively decomposed even at a voltage exceeding 4 V. It also exhibits high ionic conductivity even under low temperature conditions. Therefore, by blending the fluorinated ether with the electrolytic solution, the battery capacity of the alkali metal ion secondary battery is less likely to decrease, and the cycle characteristics can be improved.
- metal cations other than lithium ions are likely to be eluted into the non-aqueous electrolytic solution. Then, the metal cation eluted in this way is precipitated as a metal on the electrode or the separator by discharge charging.
- the metal deposited on the electrode causes a problem of increasing the impedance of the electrode.
- the metal precipitated on the separator clogs the microporous and causes a decrease in the rate characteristics of the lithium ion battery.
- the present disclosure has found that by blending a specific fluorinated ether with an electrolytic solution, the above-mentioned problems are improved and the cycle characteristics, rate characteristics, etc. of an alkali metal ion secondary battery are improved.
- the electrolytic solution of the present disclosure is a compound represented by the following formula (1) and / or a compound represented by the following formula (2).
- the fluorinated ether is preferably contained in a solvent in a proportion of 0.1 to 80% by volume. When it is within the above range, it can be used as a good electrolytic solution.
- the lower limit is more preferably 1% by volume and even more preferably 5% by volume.
- the upper limit is more preferably 70% by volume, further preferably 50% by volume.
- the electrolytic solution of the present disclosure preferably further contains a compound represented by the above formula (1) and a solvent other than the compound represented by the above formula (2) (hereinafter, this is referred to as "other solvent”). ..
- the other solvent preferably contains at least one selected from the group consisting of carbonates, carboxylic acid esters and ethers.
- the carbonate may be a cyclic carbonate or a chain carbonate.
- the cyclic carbonate may be a non-fluorinated cyclic carbonate or a fluorinated cyclic carbonate.
- non-fluorinated cyclic carbonate examples include non-fluorinated saturated cyclic carbonates, preferably non-fluorinated saturated alkylene carbonates having an alkylene group having 2 to 6 carbon atoms, and non-fluorine having an alkylene group having 2 to 4 carbon atoms. Saturated alkylene carbonate is more preferred.
- the non-fluorinated saturated cyclic carbonate has a high dielectric constant and a suitable viscosity, and thus ethylene carbonate, propylene carbonate, cis-2,3-pentylene carbonate, and cis-2,3-butylene carbonate.
- 2,3-Pentylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 1,2-butylene carbonate and at least one selected from the group consisting of butylene carbonate are preferable.
- the non-fluorinated saturated cyclic carbonate may be used alone or in combination of two or more in any combination and ratio.
- the content of the non-fluorinated saturated cyclic carbonate is preferably 5 to 90% by volume, more preferably 10 to 60% by volume, based on the solvent. It is preferably 15 to 50% by volume, more preferably.
- the fluorinated cyclic carbonate is a cyclic carbonate having a fluorine atom.
- the solvent containing the fluorinated cyclic carbonate can be suitably used even under a high voltage.
- “high voltage” means a voltage of 4.2V or more. Further, the upper limit of “high voltage” is preferably 4.9V.
- the fluorinated cyclic carbonate may be a fluorinated saturated cyclic carbonate or a fluorinated unsaturated cyclic carbonate.
- the fluorinated saturated cyclic carbonate is a saturated cyclic carbonate having a fluorine atom, and specifically, the following general formula (A):
- X 1 to X 4 are the same or different, and each has an -H, -CH 3 , -C 2 H 5 , -F, a fluorinated alkyl group which may have an ether bond, or an ether bond.
- a represents an even better fluorinated alkoxy group.
- at least one of X 1 ⁇ X 4 are, -F, good fluorinated alkyl group which may have an ether bond, or may have an ether bond It is a good fluorinated alkoxy group.
- the fluorinated alkyl group is -CF 3 , -CF 2 H, -CH 2 F, or the like.
- the oxidation resistance of the electrolytic solution is improved when the electrolytic solution of the present disclosure is applied to a high-voltage lithium ion secondary battery or the like, and stable and excellent charge / discharge characteristics can be obtained.
- the "ether bond” is a bond represented by —O—.
- Dielectric constant, the oxidation resistance is good point, one or two of X 1 ⁇ X 4, -F, good fluorinated alkyl group which may have an ether bond, or may have an ether bond It is preferably a fluorinated alkoxy group.
- X 1 ⁇ X 4 are, -H, -F, a fluorinated alkyl group (a), an ether bond It is preferably a fluorinated alkyl group (b) or a fluorinated alkoxy group (c).
- the fluorinated alkyl group (a) is obtained by substituting at least one hydrogen atom of the alkyl group with a fluorine atom.
- the number of carbon atoms of the fluorinated alkyl group (a) is preferably 1 to 20, more preferably 1 to 17, further preferably 1 to 7, and particularly preferably 1 to 5. If the carbon number is too large, the low temperature characteristics may be deteriorated or the solubility of the electrolyte salt may be lowered. If the carbon number is too small, the solubility of the electrolyte salt may be lowered, the discharge efficiency may be lowered, and further, the solubility of the electrolyte salt may be lowered. Increased viscosity may be seen.
- those having 1 carbon atom include CFH 2- , CF 2 H-, and CF 3- .
- CF 2 H- or CF 3 - is the high-temperature storage characteristics
- CF 3 - are most preferred.
- R 1- R 2- (a-1) those having 2 or more carbon atoms are selected from the following general formula (a-1): R 1- R 2- (a-1) (In the formula, R 1 is an alkyl group having 1 or more carbon atoms which may have a fluorine atom; R 2 is an alkylene group having 1 to 3 carbon atoms which may have a fluorine atom; however, R 1 and fluorinated alkyl group in which at least one of R 2 is represented by it is) has a fluorine atom, preferably exemplified from the viewpoint of satisfactory solubility of the electrolyte salt.
- R 1 and R 2 may further have other atoms other than carbon atom, hydrogen atom and fluorine atom.
- R 1 is an alkyl group having 1 or more carbon atoms which may have a fluorine atom.
- R 1 a linear or branched alkyl group having 1 to 16 carbon atoms is preferable.
- the number of carbon atoms of R 1 is more preferably 1 to 6, and even more preferably 1 to 3.
- R 1 particularly, as a linear or branched alkyl group, CH 3 -, CH 3 CH 2 -, CH 3 CH 2 CH 2 -, CH 3 CH 2 CH 2 CH 2 -, CH 3 CH 2 CH 2 CH 2 -,
- R 1 is a linear alkyl group having a fluorine atom, CF 3- , CF 3 CH 2- , CF 3 CF 2- , CF 3 CH 2 CH 2- , CF 3 CF 2 CH 2- , CF 3 CF 2 CF 2- , CF 3 CH 2 CF 2- , CF 3 CH 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CF 2 CF 2 CH 2- , CF 3 CF 2 CF 2 CH 2- , CF 3 CF 2 CH 2 CF 2- , CF 3 CH 2 CH 2 CF 2- , CF 3 CH 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2-
- R 1 is a branched-chain alkyl group having a fluorine atom
- Etc. are preferably mentioned. However, if it has a branch of CH 3- or CF 3- , the viscosity tends to be high, so the number is more preferably small (1) or zero.
- R 2 is an alkylene group having 1 to 3 carbon atoms which may have a fluorine atom.
- R 2 may be linear or branched. An example of the smallest structural unit constituting such a linear or branched alkylene group is shown below. R 2 is composed of these alone or in combination.
- the unit is composed of a Cl-free structural unit because the dehydrochloric acid reaction by a base does not occur and it is more stable.
- R 2 is linear, it is composed of only the linear minimum structural unit described above, and among them, -CH 2- , -CH 2 CH 2- or -CF 2 --is preferable. -CH 2- or -CH 2 CH 2 --is more preferable from the viewpoint that the solubility of the electrolyte salt can be further improved.
- R 2 When R 2 has a branched chain shape, it contains at least one of the above-mentioned minimum branched chain-shaped structural units, and the general formula-(CX a X b )-(X a is H, F). , CH 3 or CF 3 ; X b is CH 3 or CF 3. However, when X b is CF 3 , X a is H or CH 3 ). In particular, these can further improve the solubility of the electrolyte salt.
- Preferred alkyl fluorinated groups (a) include, for example, CF 3 CF 2- , HCF 2 CF 2- , H 2 CFCF 2- , CH 3 CF 2- , CF 3 CHF-, CH 3 CF 2- , CF 3 CF. 2 CF 2- , HCF 2 CF 2 CF 2- , H 2 CFCF 2 CF 2- , CH 3 CF 2 CF 2- ,
- the fluorinated alkyl group (b) having an ether bond is one in which at least one hydrogen atom of the alkyl group having an ether bond is replaced with a fluorine atom.
- the fluorinated alkyl group (b) having an ether bond preferably has 2 to 17 carbon atoms. If the number of carbon atoms is too large, the viscosity of the fluorinated saturated cyclic carbonate becomes high, and the number of fluorine-containing groups increases, so that the solubility of the electrolyte salt decreases due to the decrease in the dielectric constant and the compatibility with other solvents. May be seen to decrease. From this viewpoint, the number of carbon atoms of the fluorinated alkyl group (b) having an ether bond is more preferably 2 to 10, and even more preferably 2 to 7.
- the alkylene group constituting the ether portion of the fluorinated alkyl group (b) having an ether bond may be a linear or branched alkylene group.
- An example of the smallest structural unit constituting such a linear or branched alkylene group is shown below.
- the alkylene group may be composed of these minimum structural units alone, and may be linear (i) or branched chain (ii) or linear (i) and branched chain (ii). It may be composed of combinations. Preferred specific examples will be described later.
- the unit is composed of a Cl-free structural unit because the dehydrochloric acid reaction by a base does not occur and it is more stable.
- R 3- OR 4 ) n1- (b-1)
- R 3 may have a fluorine atom, preferably an alkyl group having 1 to 6 carbon atoms
- R 4 may have a fluorine atom, preferably an alkylene having 1 to 4 carbon atoms.
- n1 is an integer of 1 to 3; provided that at least one of R 3 and R 4 include those represented by and has a fluorine atom).
- R 3 and R 4 include the following, and these can be appropriately combined to form a fluorinated alkyl group (b) having an ether bond represented by the above general formula (b-1). , Not limited to these.
- R 3 has a general formula: X c 3 C- (R 5 ) n 2- (three X c are the same or different, and all are H or F; R 5 is a fluorine atom having 1 to 5 carbon atoms. It may have an alkylene group; n2 is preferably an alkyl group represented by 0 or 1).
- examples of R 3 include CH 3- , CF 3- , HCF 2-, and H 2 CF-.
- n2 is 1, assuming that R 3 is linear, CF 3 CH 2- , CF 3 CF 2- , CF 3 CH 2 CH 2- , CF 3 CF 2- CH 2- , CF 3 CF 2 CF 2- , CF 3 CH 2 CF 2- , CF 3 CH 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CF 2 CF 2 CH 2- , CF 3 CF 2 CF 2 CH 2- , CF 3 CF 2 CH 2 CF 2- , CF 3 CH 2 CH 2 CF 2- , CF 3 CH 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2 CH 2- , CF 3 CF 2 CF 2 CH 2 CH 2- , CF 3 CF 2 CF 2 CH 2- , CF 3 CF 2
- n2 is 1, and as R 3 is branched, the
- n1 is an integer of 1 to 3, preferably 1 or 2.
- R 4 may be the same or different.
- R 4 As a preferable specific example of R 4 , the following linear or branched chain can be exemplified.
- the fluorinated alkoxy group (c) is obtained by substituting at least one hydrogen atom of the alkoxy group with a fluorine atom.
- the fluorinated alkoxy group (c) preferably has 1 to 17 carbon atoms. More preferably, it has 1 to 6 carbon atoms.
- the fluorinated alkoxy group (c) has a general formula: X d 3 C- (R 6 ) n3- O- (three X d are the same or different, and H or F; R 6 is preferably carbon number. 1 - alkylene group which may have a fluorine atom 5; n3 is 0 or 1; with the proviso that one of the three X d is a fluorinated alkoxy group represented by contains fluorine atom) are particularly preferred.
- fluorinated alkoxy group (c) a fluorinated alkoxy group terminal oxygen atom is bonded to an alkyl group exemplified as R 1 in formula (a-1) can be mentioned.
- the fluorine content of the fluorinated alkyl group (a), the fluorinated alkyl group (b) having an ether bond, and the fluorinated alkoxy group (c) in the fluorinated saturated cyclic carbonate is preferably 10% by mass or more. If the fluorine content is too low, the effect of lowering the viscosity at low temperature and the effect of raising the flash point may not be sufficiently obtained. From this viewpoint, the fluorine content is more preferably 12% by mass or more, further preferably 15% by mass or more. The upper limit is usually 76% by mass.
- the fluorine content of the fluorinated alkyl group (a), the fluorinated alkyl group (b) having an ether bond, and the fluorinated alkoxy group (c) is ⁇ (the number of fluorine atoms) based on the structural formula of each group. It is a value calculated by ⁇ 19) / formula amount of each group ⁇ ⁇ 100 (%).
- the fluorine content of the entire fluorinated saturated cyclic carbonate is preferably 10% by mass or more, more preferably 15% by mass or more.
- the upper limit is usually 76% by mass.
- the fluorine content of the fluorinated saturated cyclic carbonate is determined by ⁇ (number of fluorine atoms ⁇ 19) / molecular weight of the fluorinated saturated cyclic carbonate ⁇ ⁇ 100 (%) based on the structural formula of the fluorinated saturated cyclic carbonate. It is a calculated value.
- fluorinated saturated cyclic carbonate examples include the following.
- At least one X 1 ⁇ X 4 is a -F fluorinated saturated cyclic carbonate
- Etc. can also be used.
- the fluorinated saturated cyclic carbonate is preferably any of the following compounds.
- fluorinated saturated cyclic carbonate examples include trans-4,5-difluoro-1,3-dioxolane-2-one, 5- (1,1-difluoroethyl) -4,4-difluoro-1, 3-Dioxolane-2-one, 4-methylene-1,3-dioxolane-2-one, 4-methyl-5-trifluoromethyl-1,3-dioxolane-2-one, 4-ethyl-5-fluoro- 1,3-Dioxolane-2-one, 4-ethyl-5,5-difluoro-1,3-dioxolane-2-one, 4-ethyl-4,5-difluoro-1,3-dioxolane-2-one, 4-Ethyl-4,5,5-trifluoro-1,3-dioxolane-2-one, 4,4-difluoro-5-methyl-1,3-dioxolane-2-one, 4-fluoro-5-methyl
- fluoroethylene carbonate fluoroethylene carbonate, difluoroethylene carbonate, trifluoromethylethylene carbonate (3,3,3-trifluoropropylene carbonate), 2,2,3,3,3-pentafluoro Propylethylene carbonate is more preferred.
- the fluorinated unsaturated cyclic carbonate is a cyclic carbonate having an unsaturated bond and a fluorine atom, and a fluorinated ethylene carbonate derivative substituted with an aromatic ring or a substituent having a carbon-carbon double bond is preferable.
- the above-mentioned fluorinated cyclic carbonate may be used alone or in combination of two or more in any combination and ratio.
- the content of the fluorinated cyclic carbonate is preferably 5 to 90% by volume, more preferably 10 to 60% by volume, and 15 to 15 to 60% by volume with respect to the solvent. It is more preferably 45% by volume.
- the chain carbonate may be a non-fluorinated chain carbonate or a fluorinated chain carbonate.
- non-fluorinated chain carbonate examples include CH 3 OCOOCH 3 (dimethyl carbonate: DMC), CH 3 CH 2 OCOOCH 2 CH 3 (diethyl carbonate: DEC), and CH 3 CH 2 OCOOCH 3 (ethyl methyl carbonate: EMC).
- non-fluorinated chain carbonate one type may be used alone, or two or more types may be used in combination in any combination and ratio.
- the content of the non-fluorinated chain carbonate is preferably 10 to 90% by volume, more preferably 20 to 85% by volume with respect to the solvent. It is preferably 30 to 80% by volume, more preferably 30 to 80% by volume.
- the fluorinated chain carbonate is a chain carbonate having a fluorine atom.
- the solvent containing the fluorinated chain carbonate can be suitably used even under a high voltage.
- the fluorinated chain carbonate has the general formula (B): Rf 2 OCOOR 7 (B) (In the formula, Rf 2 is a fluorinated alkyl group having 1 to 7 carbon atoms, and R 7 is an alkyl group which may contain a fluorine atom having 1 to 7 carbon atoms.) Can be mentioned.
- Rf 2 is a fluorinated alkyl group having 1 to 7 carbon atoms
- R 7 is an alkyl group which may contain a fluorine atom having 1 to 7 carbon atoms.
- the above-mentioned fluorinated alkyl group is obtained by substituting at least one hydrogen atom of the alkyl group with a fluorine atom.
- R 7 is an alkyl group containing a fluorine atom, it becomes a fluorinated alkyl group.
- Rf 2 and R 7 preferably have 1 to 7 carbon atoms, and more preferably 1 to 2 carbon atoms in that they have low viscosity.
- the carbon number is too large, the low temperature characteristics may be deteriorated or the solubility of the electrolyte salt may be lowered. If the carbon number is too small, the solubility of the electrolyte salt may be lowered, the discharge efficiency may be lowered, and further, the solubility of the electrolyte salt may be lowered. Increased viscosity may be seen.
- fluorinated alkyl group having 1 carbon atom examples include CFH 2- , CF 2 H-, CF 3- and the like.
- CFH 2- or CF 3 - is preferable in terms of high-temperature storage characteristics.
- Examples of the fluorinated alkyl group having 2 or more carbon atoms include the following general formula (d-1): R 1- R 2- (d-1) (In the formula, R 1 is an alkyl group having 1 or more carbon atoms which may have a fluorine atom; R 2 is an alkylene group having 1 to 3 carbon atoms which may have a fluorine atom; however, R 1 and fluorinated alkyl group in which at least one of R 2 is represented by it is) has a fluorine atom, preferably exemplified from the viewpoint of satisfactory solubility of the electrolyte salt.
- R 1 and R 2 may further have other atoms other than carbon atom, hydrogen atom and fluorine atom.
- R 1 is an alkyl group having 1 or more carbon atoms which may have a fluorine atom.
- R 1 a linear or branched alkyl group having 1 to 6 carbon atoms is preferable.
- the number of carbon atoms of R 1 is more preferably 1 to 3.
- R 1 particularly, as a linear or branched alkyl group, CH 3 -, CF 3 - , CH 3 CH 2 -, CH 3 CH 2 CH 2 -, CH 3 CH 2 CH 2 CH 2- ,
- R 1 is a linear alkyl group having a fluorine atom, CF 3- , CF 3 CH 2- , CF 3 CF 2- , CF 3 CH 2 CH 2- , CF 3 CF 2 CH 2- , CF 3 CF 2 CF 2- , CF 3 CH 2 CF 2- , CF 3 CH 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CH 2 CF 2 CH 2- , CF 3 CF 2 CF 2 CH 2- , CF 3 CF 2 CF 2 CH 2- , CF 3 CF 2 CH 2 CF 2- , CF 3 CH 2 CH 2 CF 2- , CF 3 CH 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2 CH 2- , CF 3 CH 2 CF 2 CH 2-
- R 1 is a branched-chain alkyl group having a fluorine atom
- Etc. are preferably mentioned. However, if it has a branch of CH 3- or CF 3- , the viscosity tends to be high, so the number is more preferably small (1) or zero.
- R 2 is an alkylene group having 1 to 3 carbon atoms which may have a fluorine atom.
- R 2 may be linear or branched. An example of the smallest structural unit constituting such a linear or branched alkylene group is shown below. R 2 is composed of these alone or in combination.
- the unit is composed of a Cl-free structural unit because the dehydrochloric acid reaction by a base does not occur and it is more stable.
- R 2 is linear, it is composed of only the linear minimum structural unit described above, and among them, -CH 2- , -CH 2 CH 2- or -CF 2 --is preferable. -CH 2- or -CH 2 CH 2 --is more preferable from the viewpoint that the solubility of the electrolyte salt can be further improved.
- R 2 When R 2 has a branched chain shape, it contains at least one of the above-mentioned minimum branched chain-shaped structural units, and the general formula-(CX a X b )-(X a is H, F). , CH 3 or CF 3 ; X b is CH 3 or CF 3. However, when X b is CF 3 , X a is H or CH 3 ). In particular, these can further improve the solubility of the electrolyte salt.
- alkyl fluorinated groups include, for example, CF 3 CF 2- , HCF 2 CF 2- , H 2 CFCF 2- , CH 3 CF 2- , CF 3 CH 2- , CF 3 CF 2 CF. 2- , HCF 2 CF 2 CF 2- , H 2 CFCF 2 CF 2- , CH 3 CF 2 CF 2- ,
- fluorinated alkyl groups of Rf 2 and R 7 CF 3- , CF 3 CF 2- , (CF 3 ) 2 CH-, CF 3 CH 2- , C 2 F 5 CH 2- , CF 3 CF 2 CH 2- , HCF 2 CF 2 CH 2- , CF 3 CFHCF 2 CH 2- , CFH 2- , CF 2 H- are preferable, and they have high flame retardancy and good rate characteristics and oxidation resistance. , CF 3 CH 2- , CF 3 CF 2 CH 2- , HCF 2 CF 2- CH 2- , CFH 2- , CF 2 H- are more preferable.
- R 7 is an alkyl group containing no fluorine atom, it is an alkyl group having 1 to 7 carbon atoms.
- R 7 preferably has 1 to 4 carbon atoms, and more preferably 1 to 3 carbon atoms in that it has a low viscosity.
- alkyl group containing no above fluorine atom for example, CH 3 -, CH 3 CH 2 -, (CH 3) 2 CH-, C 3 H 7 - , and the like.
- CH 3- and CH 3 CH 2- are preferable because of their low viscosity and good rate characteristics.
- the fluorinated chain carbonate preferably has a fluorine content of 15 to 70% by mass.
- the fluorine content is more preferably 20% by mass or more, further preferably 30% by mass or more, particularly preferably 35% by mass or more, further preferably 60% by mass or less, still more preferably 50% by mass or less.
- the fluorine content is based on the structural formula of the fluorinated chain carbonate. ⁇ (Number of fluorine atoms x 19) / Molecular weight of fluorinated chain carbonate ⁇ x 100 (%) It is a value calculated by.
- the fluorinated chain carbonate is preferably one of the following compounds in terms of low viscosity.
- the above-mentioned fluorinated chain carbonate may be used alone or in combination of two or more in any combination and ratio.
- the content of the fluorinated chain carbonate is preferably 10 to 90% by volume, more preferably 20 to 85% by volume with respect to the solvent. It is more preferably 30 to 80% by volume.
- the carboxylic acid ester may be a cyclic carboxylic acid ester or a chain carboxylic acid ester.
- the cyclic carboxylic acid ester may be a non-fluorinated cyclic carboxylic acid ester or a fluorinated cyclic carboxylic acid ester.
- non-fluorinated cyclic carboxylic acid ester examples include non-fluorinated saturated cyclic carboxylic acid esters, and non-fluorinated saturated cyclic carboxylic acid esters having an alkylene group having 2 to 4 carbon atoms are preferable.
- non-fluorinated saturated cyclic carboxylic acid ester having an alkylene group having 2 to 4 carbon atoms include ⁇ -propiolactone, ⁇ -butyrolactone, ⁇ -caprolactone, ⁇ -valerolactone, and ⁇ -methyl- ⁇ -.
- Butyrolactone can be mentioned. Of these, ⁇ -butyrolactone and ⁇ -valerolactone are particularly preferable from the viewpoint of improving the degree of lithium ion dissociation and improving the load characteristics.
- non-fluorinated saturated cyclic carboxylic acid ester one type may be used alone, or two or more types may be used in combination in any combination and ratio.
- the content of the non-fluorinated saturated cyclic carboxylic acid ester is preferably 0 to 90% by volume, preferably 0.001 to 90% by volume, based on the solvent. It is more preferably%, further preferably 1 to 60% by volume, and particularly preferably 5 to 40% by volume.
- the chain carboxylic acid ester may be a non-fluorinated chain carboxylic acid ester or a fluorinated chain carboxylic acid ester.
- the solvent contains the chain carboxylic acid ester, an increase in resistance of the electrolytic solution after storage at a high temperature can be further suppressed.
- non-fluorinated chain carboxylic acid ester examples include methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, tert-butyl propionate, and tert.
- butyl acetate, methyl propionate, ethyl propionate, propyl propionate, and butyl propionate are preferable, and ethyl propionate and propyl propionate are particularly preferable.
- non-fluorinated chain carboxylic acid ester one type may be used alone, or two or more types may be used in combination in any combination and ratio.
- the content of the non-fluorinated chain carboxylic acid ester is preferably 0 to 90% by volume, preferably 0.001 to 90% by volume, based on the solvent. It is more preferably%, further preferably 1 to 60% by volume, and particularly preferably 5 to 50% by volume.
- the fluorinated chain carboxylic acid ester is a chain carboxylic acid ester having a fluorine atom.
- the solvent containing the fluorinated chain carboxylic acid ester can be suitably used even under a high voltage.
- the fluorinated chain carboxylic acid ester has the following general formula: R 31 COOR 32 (In the formula, R 31 and R 32 are alkyl groups which may contain fluorine atoms having 1 to 4 carbon atoms independently of each other, and at least one of R 31 and R 32 contains a fluorine atom.)
- R 31 and R 32 are alkyl groups which may contain fluorine atoms having 1 to 4 carbon atoms independently of each other, and at least one of R 31 and R 32 contains a fluorine atom.
- the fluorinated chain carboxylic acid ester shown is preferable from the viewpoint of good compatibility with other solvents and oxidation resistance.
- R 31 and R 32 include a methyl group (-CH 3 ), an ethyl group (-CH 2 CH 3 ), a propyl group (-CH 2 CH 2 CH 3 ), and an isopropyl group (-CH (CH 3 ) 2 ).
- Non-fluorinated alkyl groups such as normal butyl groups (-CH 2 CH 2 CH 2 CH 3 ), tertiary butyl groups (-C (CH 3 ) 3 ); -CF 3 , -CF 2 H, -CFH 2 , -CF 2 CF 3 , -CF 2 CF 2 H, -CF 2 CFH 2 , -CH 2 CF 3 , -CH 2 CF 2 H, -CH 2 CFH 2 , -CF 2 CF 2 CF 3 , -CF 2 CF 2 CF 2 H, -CF 2 CF 2 CFH 2 , -CH 2 CF 2 CF 3 , -CH 2 CF 2 CF 2 H, -CH 2 CF 2 CFH 2 , -CH 2 CH 2 CF 3 , -CH 2 CH 2 CF 2 H, -CH 2 CH 2 CFH 2 , -CF (CF 3 ) 2 , -CF (CF 2 H) 2 ,
- methyl group, ethyl group, -CF 3 , -CF 2 H, -CF 2 CF 3 , -CH 2 CF 3 , -CH 2 CF 3 , -CH 2 CF 2 H, -CH 2 CFH 2 , -CH 2 CH 2 CF 3 , -CH 2 CF 2 CF 3 , -CH 2 CF 2 CF 2 H, and -CH 2 CF 2 CFH 2 are particularly preferable because they have good compatibility with other solvents, viscosity, and oxidation resistance.
- the above-mentioned fluorinated chain carboxylic acid ester may be used alone or in combination of two or more in any combination and ratio.
- the content of the fluorinated chain carboxylic acid ester is preferably 10 to 90% by volume and 20 to 85% by volume with respect to the solvent. Is more preferable, and 30 to 80% by volume is further preferable.
- the solvent may further contain an ether compound that does not fall under any of the general formulas (1) and (2).
- an ether compound a chain ether having 2 to 10 carbon atoms and a cyclic ether having 3 to 6 carbon atoms are preferable.
- the chain ether having 2 to 10 carbon atoms include dimethyl ether, diethyl ether, di-n-butyl ether, dimethoxymethane, methoxyethoxymethane, diethoxymethane, dimethoxyethane, methoxyethoxyethane, diethoxyethane, and ethylene glycol di-n.
- Examples thereof include -propyl ether, ethylene glycol di-n-butyl ether, diethylene glycol, diethylene glycol dimethyl ether, pentaethylene glycol, triethylene glycol dimethyl ether, triethylene glycol, tetraethylene glycol, tetraethylene glycol dimethyl ether and diisopropyl ether.
- the ether compound may contain other fluorinated ethers other than the compounds represented by the above formulas (1) and (2).
- the fluorinated ether has the following general formula (I): Rf 3- O-Rf 4 (I) (In the formula, Rf 3 and Rf 4 are the same or different, and are an alkyl group having 1 to 10 carbon atoms or a fluorinated alkyl group having 1 to 10 carbon atoms. However, at least one of Rf 3 and Rf 4 is fluorine. It is an alkyl group.) Fluorinated ether (I) represented by. By containing the fluorinated ether (I), the flame retardancy of the electrolytic solution is improved, and the stability and safety at high temperature and high voltage are improved.
- Rf 3 and Rf 4 may be a fluorinated alkyl group having 1 to 10 carbon atoms, but the electrolytic solution is flame-retardant, stable at high temperature and high voltage, and safe. From the viewpoint of further improving the properties, it is preferable that both Rf 3 and Rf 4 are fluorinated alkyl groups having 1 to 10 carbon atoms. In this case, Rf 3 and Rf 4 may be the same or different from each other. Among them, Rf 3 and Rf 4 are the same or different, Rf 3 is a fluorinated alkyl group having 3 to 6 carbon atoms, and Rf 4 is a fluorinated alkyl group having 2 to 6 carbon atoms. More preferred.
- the fluorinated ether (I) preferably has a fluorine content of 40 to 75% by mass.
- the fluorine content is in this range, the balance between nonflammability and compatibility becomes particularly excellent. It is also preferable from the viewpoint of good oxidation resistance and safety.
- the lower limit of the fluorine content is more preferably 45% by mass, further preferably 50% by mass, and particularly preferably 55% by mass.
- the upper limit is more preferably 70% by mass, further preferably 66% by mass.
- the fluorine content of the fluorinated ether (I) is ⁇ (number of fluorine atoms ⁇ 19) / molecular weight of the fluorinated ether (I) ⁇ ⁇ 100 (%) based on the structural formula of the fluorinated ether (I). ) Is the value calculated by.
- the Rf 3 for example, CF 3 CF 2 CH 2 - , CF 3 CFHCF 2 -, HCF 2 CF 2 CF 2 -, HCF 2 CF 2 CH 2 -, CF 3 CF 2 CH 2 CH 2 -, CF 3 CFHCF 2 CH 2- , HCF 2 CF 2 CF 2 CF 2- , HCF 2 CF 2 CH 2- , HCF 2 CF (CF 3 ) CH 2- and the like can be mentioned.
- the Rf 4 is, for example, -CH 2 CF 2 CF 3 , -CF 2 CFHCF 3 , -CF 2 CF 2 CF 2 H, -CH 2 CF 2 CF 2 H, -CH 2 CH 2 CF 2 CF 3 , -CH 2 CF 2 CFHCF 3 , -CF 2 CF 2 CF 2 CF 2 H, -CH 2 CF 2 CF 2 H, -CH 2 CH 2 CF 2 CF 2 H, -CH 2 CF (CF 3 ) Examples thereof include CF 2 H, -CF 2 CF 2 H, -CH 2 CF 2 H, and -CF 2 CH 3 .
- fluorinated ether (I) examples include, for example, HCF 2 CF 2 CH 2 OCF 2 CF 2 H, CF 3 CF 2 CH 2 OCF 2 CF 2 H, HCF 2 CF 2 CH 2 OCF 2 CFHCF 3 , CF.
- fluorinated ether (I) having a high boiling point.
- the boiling point of the fluorinated ether (I) is preferably 67 to 120 ° C. It is more preferably 80 ° C. or higher, and even more preferably 90 ° C. or higher.
- fluorinated ether (I) examples include CF 3 CH 2 OCF 2 CFHCF 3 , CF 3 CF 2 CH 2 OCF 2 CFHCF 3 , HCF 2 CF 2 CH 2 OCF 2 CFHCF 3 , HCF 2 CF 2 CH. 2 OCH 2 CF 2 CF 2 H, CF 3 CFHCF 2 CH 2 OCF 2 CFHCF 3 , HCF 2 CF 2 CH 2 OCF 2 CF 2 H, CF 3 CF 2 CH 2 OCF 2 CF 2 H, etc.
- the above can be mentioned.
- HCF 2 CF 2 CH 2 OCF 2 CFHCF 3 (boiling point 106 ° C) and CF 3 CF 2 CH are advantageous in that they have a high boiling point, compatibility with other solvents, and solubility of electrolyte salts.
- HCF 2 OCF 2 CFHCF 3 (boiling point 82 ° C), HCF 2 CF 2 CH 2 OCF 2 CF 2 H (boiling point 92 ° C) and CF 3 CF 2 CH 2 OCF 2 CF 2 H (boiling point 68 ° C) at least it is at least one that is preferably selected from the group consisting of HCF 2 CF 2 CH 2 OCF 2 CFHCF 3 ( boiling point 106 ° C.) and HCF 2 CF 2 CH 2 OCF 2 CF 2 H ( boiling point 92 ° C.) It is more preferable that it is one kind.
- Cyclic ethers having 3 to 6 carbon atoms include 1,2-dioxane, 1,3-dioxane, 2-methyl-1,3-dioxane, 4-methyl-1,3-dioxane, 1,4-dioxane, and meta.
- Formaldehyde, 2-methyl-1,3-dioxolane, 1,3-dioxolane, 4-methyl-1,3-dioxolane, 2- (trifluoroethyl) dioxolane 2,2, -bis (trifluoromethyl) -1 examples thereof include 3-dioxolane and the like, and fluorinated compounds thereof.
- dimethoxymethane, diethoxymethane, ethoxymethoxymethane, ethylene glycol-n-propyl ether, ethylene glycol di-n-butyl ether, diethylene glycol dimethyl ether, and crown ether have high solvation ability to lithium ions and have a high degree of ion dissociation.
- Dimethoxymethane, diethoxymethane, and ethoxymethoxymethane are preferable in terms of improvement, and particularly preferably because they have low viscosity and give high ionic conductivity.
- the other solvent preferably contains at least one selected from the group consisting of the cyclic carbonate, the chain carbonate and the chain carboxylic acid ester, and the cyclic carbonate, the chain carbonate and the chain carboxylic acid ester. It is more preferable to include at least one selected from the group consisting of carboxylic acid esters.
- the cyclic carbonate is preferably a saturated cyclic carbonate.
- the other solvent contains the cyclic carbonate and at least one selected from the group consisting of the chain carbonate and the chain carboxylic acid ester
- the cyclic carbonate, the chain carbonate and the chain carboxylic acid A total of at least one selected from the group consisting of acid esters is preferably contained in an amount of 10 to 100% by volume, preferably 30 to 100% by volume, based on the other solvents other than the compounds (1) and (2). Is more preferable, and it is further preferable to contain 50 to 100% by volume.
- the other solvent contains the cyclic carbonate and at least one selected from the group consisting of the chain carbonate and the chain carboxylic acid ester, the cyclic carbonate, the chain carbonate and the chain carboxylic acid
- the volume ratio with at least one selected from the group consisting of acid esters is preferably 5/95 to 95/5, more preferably 10/90 or more, further preferably 15/85 or more, and 20/80 or more. It is particularly preferable, 90/10 or less is more preferable, 60/40 or less is further preferable, and 50/50 or less is particularly preferable.
- the other solvent preferably also contains at least one selected from the group consisting of the fluorinated saturated cyclic carbonate, the fluorinated chain carbonate and the fluorinated chain carboxylic acid ester, and is preferably fluorinated saturated. It is more preferable to contain a cyclic carbonate and at least one selected from the group consisting of the fluorinated chain carbonate and the fluorinated chain carboxylic acid ester.
- the electrolytic solution containing the solvent having the above composition can be suitably used not only for an electrochemical device used at a relatively low voltage but also for an electrochemical device used at a relatively high voltage of 4.3 V or more.
- the non-fluorinated chain carbonate is used.
- a total of 5 to 100% by volume, preferably 20 to 100% of the saturated cyclic carbonate and at least one selected from the group consisting of the non-fluorinated chain carbonate and the non-fluorinated chain carboxylic acid ester are contained. It is more preferably contained in% by volume, and even more preferably 30 to 100% by volume.
- the electrolytic solution contains the non-fluorinated saturated cyclic carbonate and at least one selected from the group consisting of the non-fluorinated chain carbonate and the non-fluorinated chain carboxylic acid ester
- the non-fluorinated saturated The volume ratio of the cyclic carbonate to at least one selected from the group consisting of the non-fluorinated chain carbonate and the non-fluorinated chain carboxylic acid ester is preferably 5/95 to 95/5, preferably 10 /. 90 or more is more preferable, 15/85 or more is further preferable, 20/80 or more is particularly preferable, 90/10 or less is more preferable, 60/40 or less is further preferable, and 50/50 or less is particularly preferable.
- the other solvent preferably also contains at least one selected from the group consisting of the fluorinated saturated cyclic carbonate, the fluorinated chain carbonate and the fluorinated chain carboxylic acid ester, and is preferably fluorinated saturated. It is more preferable to contain a cyclic carbonate and at least one selected from the group consisting of the fluorinated chain carbonate and the fluorinated chain carboxylic acid ester.
- the electrolytic solution containing the solvent having the above composition can be suitably used not only for an electrochemical device used at a relatively low voltage but also for an electrochemical device used at a relatively high voltage.
- the other solvent contains the fluorinated saturated cyclic carbonate and at least one selected from the group consisting of the fluorinated chain carbonate and the fluorinated chain carboxylic acid ester, the fluorinated saturated cyclic carbonate and the above.
- At least one selected from the group consisting of the above-mentioned fluorinated chain carbonate and the above-mentioned fluorinated chain carboxylic acid ester in total, 5 to 100 with respect to other solvents except compounds (1) and (2). It is preferably contained in% by volume, more preferably 10 to 100% by volume, and even more preferably 30 to 100% by volume.
- the other solvent contains the fluorinated saturated cyclic carbonate and at least one selected from the group consisting of the fluorinated chain carbonate and the fluorinated chain carboxylic acid ester, the fluorinated saturated cyclic carbonate and the above.
- the volume ratio with at least one selected from the group consisting of the fluorinated chain carbonate and the fluorinated chain carboxylic acid ester is preferably 5/95 to 95/5, more preferably 10/90 or more. , 15/85 or more is more preferable, 20/80 or more is particularly preferable, 90/10 or less is more preferable, 60/40 or less is further preferable, and 50/50 or less is particularly preferable.
- the solvent contains the compound represented by the above formula (1) and / or the fluorinated ether represented by the following formula (2) and at least one of the above ether compounds
- the total amount is 10 to 100% by volume. It is preferably contained, more preferably 30 to 100% by volume, still more preferably 50 to 100% by volume.
- an ionic liquid can also be used as the above-mentioned other solvent.
- An "ionic liquid” is a liquid composed of ions in which an organic cation and an anion are combined.
- organic cation examples include, but are not limited to, imidazolium ions such as dialkyl imidazolium cations and trialkyl imidazolium cations; tetraalkylammonium ions; alkylpyridinium ions; dialkylpyrridinium ions; ..
- the anions that serve as counters for these organic cations are not particularly limited, but are, for example, PF 6 anions, PF 3 (C 2 F 5 ) 3 anions, PF 3 (CF 3 ) 3 anions, BF 4 anions, and BF 2 ( CF 3 ) 2 anion, BF 3 (CF 3 ) anion, bisoxalate borate anion, P (C 2 O 4 ) F 2 anion, Tf (trifluoromethanesulfonyl) anion, Nf (nonafluorobutanesulfonyl) anion, bis ( Fluorosulfonyl) imide anion, bis (trifluoromethanesulfonyl) imide anion, bis (pentafluoroethanesulfonyl) imide anion, dicyanoamine anion, and halide anion can be used.
- the solvent is preferably a non-aqueous solvent
- the electrolytic solution of the present disclosure is preferably a non-aqueous electrolytic solution.
- the content of the solvent is preferably 70 to 99.999% by mass, more preferably 80% by mass or more, and more preferably 92% by mass or less in the electrolytic solution.
- the electrolytic solution of the present disclosure may further contain the compound (5) represented by the general formula (5).
- a a + is a metal ion, a hydrogen ion or an onium ion.
- A is an integer of 1 to 3
- b is an integer of 1 to 3
- p is b / a
- n203 is an integer of 1 to 4
- n201 is 0 to.
- n202 is 0 or 1
- Z 201 is a transition metal, and an element of Group III, Group IV or Group V of the periodic table.
- X 201 is O, S, an alkylene group having 1 to 10 carbon atoms, a halogenated alkylene group having 1 to 10 carbon atoms, an arylene group having 6 to 20 carbon atoms, or a halogenated arylene group having 6 to 20 carbon atoms (alkylene group). , a halogenated alkylene group, an arylene group, and halogenated arylene group substituent in its structure, n203 amino X 201 when the may have a hetero atom, and n202 is at 1 n203 is 2-4 Each may be combined).
- L 201 is a halogen atom, a cyano group, an alkyl group having 1 to 10 carbon atoms, an alkyl halide group having 1 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, and an aryl halide group having 6 to 20 carbon atoms ( alkylene group, a halogenated alkylene group, an arylene group, and halogenated arylene group substituent in its structure, may have a hetero atom, and when n201 is 2 to 8, respectively n201 amino L 201 May be combined to form a ring) or -Z 203 Y 203 .
- Y 201 , Y 202 and Z 203 are independently O, S, NY 204 , hydrocarbon groups or fluorinated hydrocarbon groups, respectively.
- Y 203 and Y 204 are independently H, F, an alkyl group having 1 to 10 carbon atoms, an alkyl halide group having 1 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, or a halogen having 6 to 20 carbon atoms.
- Aryl halide groups (alkyl groups, alkyl halide groups, aryl groups and aryl halide groups may have substituents and heteroatoms in their structures, and when a plurality of Y 203 or Y 204 are present, respectively. May combine to form a ring).
- a a + is preferably lithium ion, sodium ion, magnesium ion, tetraalkylammonium ion, or hydrogen ion, and lithium ion is particularly preferable.
- the valence a of the cation of A a + is an integer of 1 to 3. If it is larger than 3, the crystal lattice energy becomes large, which causes a problem that it becomes difficult to dissolve in the solvent. Therefore, 1 is more preferable when solubility is required.
- the valence b of the anion is also an integer of 1 to 3, and 1 is particularly preferable.
- the constant p representing the ratio of cation and anion is inevitably determined by the ratio b / a of the valences of both.
- the ligand portion of the general formula (5) will be described.
- the organic or inorganic moiety bound to Z 201 in the general formula (5) is referred to as a ligand.
- Z 201 is preferably Al, B, V, Ti, Si, Zr, Ge, Sn, Cu, Y, Zn, Ga, Nb, Ta, Bi, P, As, Sc, Hf or Sb, and Al. , B or P is more preferable.
- X 201 represents O, S, an alkylene group having 1 to 10 carbon atoms, a halogenated alkylene group having 1 to 10 carbon atoms, an arylene group having 6 to 20 carbon atoms, or a halogenated arylene group having 6 to 20 carbon atoms.
- alkylene groups and arylene groups may have substituents and heteroatoms in their structures.
- a halogen atom instead of hydrogen on the alkylene group and the arylene group, a halogen atom, a chain or cyclic alkyl group, an aryl group, an alkenyl group, an alkoxy group, an aryloxy group, a sulfonyl group, an amino group, a cyano group, and a carbonyl group. It may have a group, an acyl group, an amide group, or a hydroxyl group as a substituent, or it may have a structure in which nitrogen, sulfur, or oxygen is introduced instead of carbon on alkylene and arylene. Also when n202 is at 1 n203 is 2 to 4, n203 amino X 201 may be bonded respectively. Such examples include ligands such as ethylenediaminetetraacetic acid.
- L 201 is a halogen atom, a cyano group, an alkyl group having 1 to 10 carbon atoms, an alkyl halide group having 1 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aryl halide group having 6 to 20 carbon atoms, or the like.
- -Z 203 Y 203 Z 203 and Y 203 will be described later.
- the alkyl group and aryl group may also have a substituent and a hetero atom in their structure, and when n 201 is 2 to 8, n 201 L 201 are bonded to each other. May form a ring.
- a fluorine atom or a cyano group is preferable. This is because, in the case of a fluorine atom, the solubility and dissociation degree of the salt of the anionic compound are improved, and the ionic conductivity is improved accordingly. In addition, the oxidation resistance is improved, which can suppress the occurrence of side reactions.
- Y 201 , Y 202 and Z 203 independently represent O, S, NY 204 , hydrocarbon groups or fluorinated hydrocarbon groups.
- Y 201 and Y 202 are preferably O, S or NY 204 , and more preferably O. Since the compound (5) has a bond with Z 201 by Y 201 and Y 202 in the same ligand, these ligands form a chelate structure with Z 201 . Due to the effect of this chelate, the heat resistance, chemical stability, and hydrolysis resistance of this compound are improved.
- n202 in this ligand is 0 or 1, but in particular, when it is 0, the chelating ring becomes a five-membered ring, so that the chelating effect is most strongly exerted and the stability is increased, which is preferable.
- the fluorinated hydrocarbon group is a group in which at least one hydrogen atom of the hydrocarbon group is replaced with a fluorine atom.
- Y 203 and Y 204 are independent of each other and have H, F, an alkyl group having 1 to 10 carbon atoms, an alkyl halide group having 1 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms. It is an aryl halide group, and these alkyl groups and aryl groups may have a substituent or a heteroatom in the structure, and when a plurality of Y 203 or Y 204 are present, each of them is bonded. May form a ring.
- n203 related to the number of ligands described above is an integer of 1 to 4, preferably 1 or 2, and more preferably 2.
- the constant n201 related to the number of ligands described above is an integer of 0 to 8, preferably an integer of 0 to 4, and more preferably 0, 2 or 4. Further, it is preferable that n201 is 2 when n203 is 1, and n201 is 0 when n203 is 2.
- the alkyl group, the alkyl halide group, the aryl group, and the aryl halide group include those having other functional groups such as a branch, a hydroxyl group, and an ether bond.
- a a + , a, b, p, n201, Z 201 and L 201 are as described above.
- Examples of the compound (5) include lithium oxalatoborate salts, which have the following formula:
- Lithium bis (oxalate) borate represented by, the following formula:
- LIDFOB Lithium difluorooxalatoborate
- the compound (5) also includes the following formula:
- LIDFOP Lithium difluorooxalatphosphanite
- LITFOP Lithium tetrafluorooxaratphosphanite
- lithium bis (oxalate) difluorophosphanite represented by.
- dicarboxylic acid complex salt in which the complex central element is boron include lithium bis (malonato) borate, lithium difluoro (malonato) borate, lithium bis (methylmalonato) borate, lithium difluoro (methylmalonato) borate, and lithium bis (. Examples thereof include dimethylmalonato) borate and lithium difluoro (dimethylmalonato) borate.
- dicarboxylic acid complex salt in which the central element of the complex is phosphorus include lithium tris (oxalat) phosphate, lithium tris (malonato) phosphate, lithium difluorobis (malonato) phosphate, lithium tetrafluoro (malonato) phosphate, and lithium tris (lithium tris (malonato) phosphate.
- Methylmalonato) phosphate lithium difluorobis (methylmalonato) phosphate, lithium tetrafluoro (methylmalonato) phosphate, lithiumtris (dimethylmalonato) phosphate, lithium difluorobis (dimethylmalonato) phosphate, lithium tetrafluoro (dimethylmalonato) phosphate, etc. Can be mentioned.
- dicarboxylic acid complex salt in which the complex center element is aluminum examples include LiAl (C 2 O 4 ) 2 , LiAl F 2 (C 2 O 4 ) and the like.
- lithium bis (oxalat) borate lithium difluoro (oxalat) borate, lithium tris (oxalate) phosphate, lithium difluorobis (oxalat) phosphate, and lithium tetrafluoro (oxalat) phosphate are easily available and have a stable film-like structure. It is more preferably used because it can contribute to the formation of an object.
- lithium bis (oxalate) borate is particularly preferable.
- the content of the compound (5) is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, and 10% by mass, based on the above solvent, because even more excellent cycle characteristics can be obtained. % Or less is preferable, and 3% by mass or less is more preferable.
- the electrolytic solution of the present disclosure preferably further contains an electrolyte salt (excluding compounds (1) and (5)).
- the electrolyte salt include alkali metal salts, ammonium salts, metal salts other than alkali metal salts (for example, light metal salts other than alkali metal salts), liquid salts (ionic liquids), and inorganic polymer types. Any salt that can be used in the electrolytic solution, such as a salt or an organic polymer type salt, can be used.
- Examples of the electrolyte salt of the electrolytic solution for the alkali metal ion secondary battery include the following compounds. MPF 6 , MBF 4 , MClO 4 , MAsF 6 , MB (C 6 H 5 ) 4 , MCH 3 SO 3 , MCF 3 SO 3 , MAlCl 4 , M 2 SiF 6 , MCl, MBr.
- M is at least one metal selected from the group consisting of Li, Na and K, preferably one metal selected from the group consisting of Li, Na and K, more preferably. Is Li or Na, more preferably Li.
- At least one selected from MPF 6 , MBF 4 , MCLO 4 and MAsF 6 is preferable, and MPF 6 is more preferable.
- Lithium salt is preferable as the electrolyte salt of the electrolytic solution for the alkali metal ion secondary battery.
- Any of the above lithium salts can be used, and specific examples thereof include the following.
- Inorganic lithium salt such as LiPO 2 F 2 ; Lithium tungstates such as LiWOF 5 ; HCO 2 Li, CH 3 CO 2 Li, CH 2 FCO 2 Li, CHF 2 CO 2 Li, CF 3 CO 2 Li, CF 3 CH 2 CO 2 Li, CF 3 CF 2 CO 2 Li, CF 3 CF 2 CF 2 Lithium carboxylic acid salts such as CO 2 Li, CF 3 CF 2 CF 2 CO 2 Li; FSO 3 Li, CH 3 SO 3 Li, CH 2 FSO
- LiPF 6 LiN (FSO 2 ) 2 and LiBF 4.
- Lithium salt is most preferable.
- electrolyte salts may be used alone or in combination of two or more.
- a preferable example when two or more kinds are used in combination is a combination of LiPF 6 and LiBF 4 , or a combination of LiPF 6 and LiPO 2 F 2 , C 2 H 5 OSO 3 Li or FSO 3 Li, which have high temperature storage characteristics. It has the effect of improving load characteristics and cycle characteristics.
- the blending amount of LiBF 4 , LiPO 2 F 2 , C 2 H 5 OSO 3 Li or FSO 3 Li with respect to 100% by mass of the entire electrolytic solution is not limited and is arbitrary as long as the effects of the present disclosure are not significantly impaired.
- 0.01% by mass or more preferably 0.1% by mass or more, and usually 30% by mass or less, preferably 20% by mass or less, more preferably 10% by mass, based on the electrolytic solution of the present disclosure.
- % Or less more preferably 5% by mass or less.
- Organolithium salts include CF 3 SO 3 Li, LiN (FSO 2 ) 2 , LiN (FSO 2 ) (CF 3 SO 2 ), LiN (CF 3 SO 2 ) 2 , LiN (C 2 F 5 SO 2 ) 2 , Lithium cyclic 1,2-perfluoroethanedisulfonylimide, Lithium cyclic 1,3-perfluoropropanedisulfonylimide, LiC (FSO 2 ) 3 , LiC (CF 3 SO 2 ) 3 , LiC (C 2 F 5 SO) 2 ) 3 , LiBF 3 CF 3 , LiBF 3 C 2 F 5 , LiPF 3 (CF 3 ) 3 , LiPF 3 (C 2 F 5 ) 3, etc.
- the ratio of the organolithium salt to 100% by mass of the entire electrolytic solution is preferably 0.1% by mass or more, particularly preferably 0.5% by mass or more, and preferably 30% by mass or less, particularly. It is preferably 20% by mass or less.
- the concentration of these electrolyte salts in the electrolyte is not particularly limited as long as the effects of the present disclosure are not impaired.
- the total molar concentration of lithium in the electrolytic solution is preferably 0.3 mol / L or more, more preferably 0.4 mol / L, from the viewpoint of keeping the electric conductivity of the electrolytic solution in a good range and ensuring good battery performance. As mentioned above, it is more preferably 0.5 mol / L or more, preferably 3 mol / L or less, more preferably 2.5 mol / L or less, still more preferably 2.0 mol / L or less.
- the electrical conductivity of the electrolyte may be insufficient, while if the concentration is too high, the electrical conductivity may decrease due to the increase in viscosity, resulting in poor battery performance. May be done.
- the electrolytic solution of the present disclosure has a general formula (6):
- X 21 is a group containing at least H or C
- n 21 is an integer of 1 to 3
- Y 21 and Z 21 are the same or different
- n 22 is a group containing at least H, C, O or F
- n 22 is 0.
- 1, Y 21 and Z 21 may be bonded to each other to form a ring
- the compound (6) further contained.
- n21 is 2 or 3
- two or three X 21 may be different even in the same.
- the plurality of Y 21 and Z 21 may be the same or different.
- the group is preferred.
- Y 21 includes H-, F-, CH 3- , CH 3 CH 2- , CH 3 CH 2 CH 2- , CF 3- , CF 3 CF 2- , CH 2 FCH 2- and CF 3 CF 2 CF. At least one selected from the group consisting of 2- is preferable.
- Z 21 H-, F-, CH 3- , CH 3 CH 2- , CH 3 CH 2 CH 2- , CF 3- , CF 3 CF 2- , CH 2 FCH 2- and CF 3 CF 2 CF At least one selected from the group consisting of 2- is preferable.
- Y 21 and Z 21 can be bonded to each other to form a carbocycle or heterocycle which may contain an unsaturated bond and may have aromaticity.
- the number of carbon atoms in the ring is preferably 3 to 20.
- the "related material” refers to an acid anhydride obtained by replacing a part of the structure of the exemplified acid anhydride with another structure within a range not contrary to the purpose of the present disclosure.
- a dimer, a trimeric and a tetramer composed of a plurality of acid anhydrides, or an isostructural heterogeneous substance having the same number of carbon atoms but having a branched chain the substituent is an acid. Examples thereof include those having different sites that bind to the anhydride.
- acid anhydride forming a 5-membered ring structure examples include succinic anhydride, methylsuccinic anhydride (4-methylsuccinic anhydride), and dimethylsuccinic anhydride (4,4-dimethylsuccinic anhydride).
- acid anhydride forming a 6-membered ring structure examples include cyclohexanedicarboxylic acid anhydride (cyclohexane-1,2-dicarboxylic acid anhydride, etc.), 4-cyclohexene-1,2-dicarboxylic acid anhydride, and the like.
- Examples thereof include glutacon anhydride, glutaconic anhydride, 2-phenylglutaric anhydride and the like, and their analogs.
- acid anhydrides forming a cyclic structure include 5-norbornene-2,3-dicarboxylic acid anhydride, cyclopentanetetracarboxylic dianhydride, pyromellitic acid anhydride, and diglycolic acid anhydride. Etc., and their analogs and the like.
- the acid anhydride having a cyclic structure and substituted with a halogen atom include monofluorosuccinic anhydride (4-fluorosuccinic anhydride, etc.), 4,4-difluorosuccinic anhydride, 4 , 5-Difluorosuccinate anhydride, 4,4,5-trifluorosuccinate anhydride, trifluoromethylsuccinic anhydride, tetrafluorosuccinate anhydride (4,5,5-tetrafluorosuccinate anhydride) ), 4-Fluoromaleic anhydride, 4,5-difluoromaleic anhydride, trifluoromethylmaleic anhydride, 5-fluoroitaconic acid anhydride, 5,5-difluoroitaconic acid anhydride, etc., and them.
- Anhydrides and the like can be mentioned.
- Examples of the compound (6) include glutacon anhydride, citraconic anhydride, glutaconic anhydride, itaconic anhydride, diglycolic acid anhydride, cyclohexanedicarboxylic acid anhydride, cyclopentanetetracarboxylic dianhydride, and 4-cyclohexene.
- X 41 and X 42 are the same or different, and are preferably at least one selected from the group consisting of compound (8) represented by at least H, C, O or F). ..
- X 31 to X 34 at least one selected from the group consisting of an alkyl group, a fluorinated alkyl group, an alkenyl group and a fluorinated alkenyl group is preferable.
- the carbon number of X 31 to X 34 is preferably 1 to 10, and more preferably 1 to 3.
- X 31 to X 34 are the same or different, H-, F-, CH 3- , CH 3 CH 2- , CH 3 CH 2 CH 2- , CF 3- , CF 3 CF 2- , CH 2 FCH. 2 - and CF 3 CF 2 CF 2 - at least one member selected from the group consisting of is more preferable.
- X 41 and X 42 at least one selected from the group consisting of an alkyl group, a fluorinated alkyl group, an alkenyl group and a fluorinated alkenyl group is preferable.
- the carbon number of X 41 and X 42 is preferably 1 to 10, and more preferably 1 to 3.
- X 41 and X 42 are the same or different, H-, F-, CH 3- , CH 3 CH 2- , CH 3 CH 2 CH 2- , CF 3- , CF 3 CF 2- , CH 2 FCH. 2 - and CF 3 CF 2 CF 2 - at least one member selected from the group consisting of is more preferable.
- the compound (7) is preferably any of the following compounds.
- the compound (8) is preferably any of the following compounds.
- the capacity retention rate is less likely to decrease and the amount of gas generated is less likely to increase. Therefore, 0.0001 to 15% by mass of the compound (with respect to the electrolytic solution). It is preferable to include 6).
- the content of the compound (6) is more preferably 0.01 to 10% by mass, further preferably 0.1 to 3% by mass, and particularly preferably 0.1 to 1.0% by mass.
- the capacity retention rate is less likely to decrease and the amount of gas generated is less likely to increase even when stored at a high temperature.
- 0.08 to 2.50% by mass of the compound (7) and 0.02 to 1.50% by mass of the compound (8) are preferably contained with respect to the above electrolytic solution, and 0.80 to 2.50. It is more preferable to contain the mass% of the compound (7) and the 0.08 to 1.50 mass% of the compound (8).
- the electrolytic solution of the present disclosure may contain at least one selected from the group consisting of nitrile compounds represented by the following general formulas (9a), (9b) and (9c).
- Ra and R b are independent hydrogen atoms, cyano groups (CN), halogen atoms, alkyl groups, or groups in which at least a part of the hydrogen atoms of the alkyl group are replaced with halogen atoms.
- N represents an integer from 1 to 10.
- R c is a hydrogen atom, a halogen atom, an alkyl group, a group in which at least a part of the hydrogen atom of the alkyl group is replaced with a halogen atom, or NC-R c1- X c1- (R c1 is an alkylene group. , X c1 is .R d and R e represents a group represented by an oxygen atom or a sulfur atom.) are each independently a hydrogen atom, a halogen atom, an alkyl group, or at least a portion of the alkyl group Represents a group in which the hydrogen atom of is replaced with a halogen atom.
- M represents an integer of 1 to 10.
- R f , R g , R h and R i are each independently at least one of a group containing a cyano group (CN), a hydrogen atom (H), a halogen atom, an alkyl group, or an alkyl group.
- the part hydrogen atoms represents a group obtained by substituting a halogen atom.
- at least one of R f, R g, R h and R i is a group containing a cyano group .l represents an integer of 1 to 3 .
- Ra and R b independently use a hydrogen atom, a cyano group (CN), a halogen atom, an alkyl group, or at least a part of the hydrogen atom of the alkyl group as a halogen atom. It is a substituted group.
- the halogen atom include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom. Of these, a fluorine atom is preferable.
- the alkyl group preferably has 1 to 5 carbon atoms.
- alkyl group examples include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group and the like.
- group in which at least a part of the hydrogen atom of the alkyl group is replaced with a halogen atom examples include a group in which at least a part of the hydrogen atom of the above-mentioned alkyl group is replaced with the above-mentioned halogen atom.
- Ra and R b are an alkyl group or a group in which at least a part of hydrogen atoms of the alkyl group are substituted with halogen atoms
- Ra and R b are bonded to each other to form a ring structure (for example, cyclohexane ring). ) May be formed.
- R a and R b are preferably hydrogen atoms or alkyl groups.
- n is an integer of 1 to 10.
- n pieces of R a may be the same for all, it may be at least partially different.
- R b is preferably an integer of 1 to 7, and more preferably an integer of 2 to 5.
- dinitrile and tricarbonitrile are preferable.
- dinitrile include malononitrile, succinonitrile, glutaronitrile, adipoinitrile, pimeronitrile, suberonitrile, azeranitrile, sebaconitrile, undecandinitrile, dodecandinitrile, methylmalononitrile, ethylmalononitrile, isopropylmalononitrile, tert-butyl Marononitrile, methylsuccinonitrile, 2,2-dimethylsuccinonitrile, 2,3-dimethylsuccinonitrile, 2,3,3-trimethylsuccinonitrile, 2,2,3,3-tetramethylsuccinonitrile , 2,3-diethyl-2,3-dimethylsuccinonitrile, 2,2-diethyl-3,3-dimethylsuccinonitrile, bicyclohexyl-1,
- succinonitrile particularly preferred are succinonitrile, glutaronitrile, and adiponitrile.
- the tricarbonitrile include pentantricarbonitrile, propantricarbonitrile, 1,3,5-hexanetricarbonitrile, 1,3,6-hexanetricarbonitrile, heptanetricarbonitrile, 1, Examples thereof include 2,3-propanetricarbonitrile, 1,3,5-pentanetricarbonitrile, cyclohexanetricarbonitrile, triscyanoethylamine, triscyanoethoxypropane, tricyanoethylene, tris (2-cyanoethyl) amine and the like.
- Preferred are 1,3,6-hexanetricarbonitrile, cyclohexanetricarbonitrile, and most preferred are cyclohexanetricarbonitrile.
- R c is a hydrogen atom, a halogen atom, an alkyl group, a group in which at least a part of hydrogen atoms of the alkyl group is replaced with a halogen atom, or NC-R c1- X c1- (R).
- c1 is an alkylene group
- X c1 is an oxygen atom or a sulfur atom
- R d and Re are independently hydrogen atoms, halogen atoms, alkyl groups, or alkyl groups. It is a group in which at least a part of hydrogen atoms are replaced with halogen atoms.
- halogen atom examples include those exemplified by the above general formula (9a).
- the NC-R c1 -X c1 - in R c1 is an alkylene group.
- the alkylene group an alkylene group having 1 to 3 carbon atoms is preferable.
- R c , R d and Re are independently hydrogen atoms, halogen atoms, alkyl groups, or groups in which at least a part of the hydrogen atoms of the alkyl groups are substituted with halogen atoms.
- At least one of R c , R d and Re is preferably a halogen atom or a group in which at least a part of the hydrogen atom of the alkyl group is replaced with a halogen atom, and at least a fluorine atom or an alkyl group. It is more preferable that the group is a group in which some hydrogen atoms are replaced with fluorine atoms.
- R d and Re are an alkyl group or a group in which at least a part of the hydrogen atom of the alkyl group is replaced with a halogen atom, R d and Re are bonded to each other to form a ring structure (for example, cyclohexane ring). ) May be formed.
- m is an integer of 1 to 10.
- all m R ds may be the same, or at least a part thereof may be different. The same applies to the R e.
- an integer of 2 to 7 is preferable, and an integer of 2 to 5 is more preferable.
- nitrile compound represented by the general formula (9b) examples include acetonitrile, propionitrile, butyronitrile, isobutyronitrile, valeronitrile, isovaleronitrile, lauronitrile, 3-methoxypropionitrile, and 2-methylbutyro.
- R f , R g , R h and R i are independently at least a group containing a cyano group (CN), a hydrogen atom, a halogen atom, an alkyl group, or an alkyl group. It is a group in which some hydrogen atoms are replaced with halogen atoms. Examples of the halogen atom, the alkyl group, and the group in which at least a part of the hydrogen atom of the alkyl group is replaced with the halogen atom include those exemplified by the above general formula (9a).
- Examples of the group containing a cyano group include a cyano group and a group in which at least a part of hydrogen atoms of an alkyl group is replaced with a cyano group.
- Examples of the alkyl group in this case include those exemplified for the above general formula (9a).
- R f, R g, at least one of R h and R i is a group containing a cyano group.
- at least two of R f , R g , R h and R i are groups containing a cyano group, and more preferably R h and R i are groups containing a cyano group. ..
- R f and R g are preferably hydrogen atoms.
- l is an integer of 1 to 3.
- all l R fs may be the same, or at least a part thereof may be different.
- l is preferably an integer of 1 to 2.
- nitrile compound represented by the general formula (9c) examples include 3-hexendinitrile, mucononitrile, maleonitrile, fumaronitrile, acrylonitrile, methacrylonitrile, crotononitrile, 3-methylcrotononitrile, and 2-methyl-2-.
- Butenenitrile, 2-pentenenitrile, 2-methyl-2-pentenenitrile, 3-methyl-2-pentenenitrile, 2-hexenenitrile and the like are exemplified, and 3-hexenedinitrile and mucononitrile are preferable, and 3-hexenedinitrile is particularly preferable.
- Nitrile is preferred.
- the content of the nitrile compound is preferably 0.2 to 7% by mass with respect to the electrolytic solution. As a result, the high-voltage storage characteristics and safety of the electrochemical device can be further improved.
- the lower limit of the total content of the nitrile compounds is more preferably 0.3% by mass, further preferably 0.5% by mass.
- the upper limit is more preferably 5% by mass, further preferably 2% by mass, and particularly preferably 0.5% by mass.
- the electrolytic solution of the present disclosure may contain a compound having an isocyanato group (hereinafter, may be abbreviated as "isocyanate”).
- isocyanate is not particularly limited, and any isocyanate can be used. Examples of isocyanates include monoisocyanates, diisocyanates, triisocyanates and the like.
- monoisocyanates include isocyanatomethane, isocyanatoetane, 1-isocyanatopropane, 1-isocyanatobutane, 1-isocyanatopentane, 1-isocyanatohexane, 1-isocyanatoheptane, 1-isocyanate.
- diisocyanates include 1,4-diisocyanatobutane, 1,5-diisocyanatopentane, 1,6-diisocyanatohexane, 1,7-diisocyanatoheptane, and 1,8-diisocyanate.
- 1,6-diisocyanatohexane, 1,3-bis (isocyanatomethyl) cyclohexane, 1,3,5-tris (6-isocyanatohexa-1-yl) -1,3,5-triazine- 2,4,6 (1H, 3H, 5H) -trione, 2,4,4-trimethylhexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate are industrially readily available. Therefore, it is preferable in that the production cost of the electrolytic solution can be kept low, and it can contribute to the formation of a stable film-like structure from a technical point of view, and is more preferably used.
- the content of isocyanate is not particularly limited and is arbitrary as long as the effects of the present disclosure are not significantly impaired, but is preferably 0.001% by mass or more and 1.0% by mass or less with respect to the electrolytic solution.
- the content of isocyanate is more preferably 0.01% by mass or more, further preferably 0.1% by mass or more, particularly preferably 0.2% by mass or more, still more preferably 0.8% by mass or less, still more preferable. Is 0.7% by mass or less, particularly preferably 0.6% by mass or less.
- the electrolytic solution of the present disclosure may contain a cyclic sulfonic acid ester.
- the cyclic sulfonic acid ester is not particularly limited, and any cyclic sulfonic acid ester can be used.
- Examples of the cyclic sulfonic acid ester include saturated cyclic sulfonic acid ester, unsaturated cyclic sulfonic acid ester, saturated cyclic disulfonic acid ester, unsaturated cyclic disulfonic acid ester and the like.
- saturated cyclic sulfonic acid ester examples include 1,3-propanesulton, 1-fluoro-1,3-propanesulton, 2-fluoro-1,3-propanesulton, 3-fluoro-1,3-propanesulton.
- unsaturated cyclic sulfonic acid ester examples include 1-propen-1,3-sulton, 2-propen-1,3-sulton, 1-fluoro-1-propen-1,3-sulton, 2-fluoro-.
- 1,3-propane sultone, 1-fluoro-1,3-propane sultone, 2-fluoro-1,3-propane sultone, 3-fluoro-1,3-propane sultone, 1-propene-1,3- Sultone is more preferably used because it is easily available and can contribute to the formation of a stable film-like structure.
- the content of the cyclic sulfonic acid ester is not particularly limited and is arbitrary as long as the effects of the present disclosure are not significantly impaired, but is preferably 0.001% by mass or more and 3.0% by mass or less with respect to the electrolytic solution. is there.
- the content of the cyclic sulfonic acid ester is more preferably 0.01% by mass or more, further preferably 0.1% by mass or more, particularly preferably 0.2% by mass or more, and even more preferably 2.5% by mass or less. It is more preferably 2.0% by mass or less, and particularly preferably 1.8% by mass or less.
- the electrolytic solution of the present disclosure may further contain polyethylene oxide having a weight average molecular weight of 2000 to 4000 and having -OH, -OCOOH, or -COOH at the end.
- polyethylene oxide having a weight average molecular weight of 2000 to 4000 and having -OH, -OCOOH, or -COOH at the end.
- the stability of the electrode interface can be improved and the characteristics of the electrochemical device can be improved.
- the polyethylene oxide include polyethylene oxide monool, polyethylene oxide carboxylic acid, polyethylene oxide diol, polyethylene oxide dicarboxylic acid, polyethylene oxide triol, and polyethylene oxide tricarboxylic acid. These may be used alone or in combination of two or more. Among them, a mixture of polyethylene oxide monool and polyethylene oxide diol and a mixture of polyethylene carboxylic acid and polyethylene dicarboxylic acid are preferable in that the characteristics of the electrochemical device are improved.
- the weight average molecular weight of the polyethylene oxide is too small, it may be easily oxidatively decomposed.
- the weight average molecular weight is more preferably 3000 to 4000.
- the weight average molecular weight can be measured by polystyrene conversion by gel permeation chromatography (GPC) method.
- the content of the polyethylene oxide is preferably 1 ⁇ 10 -6 to 1 ⁇ 10 ⁇ 2 mol / kg in the electrolytic solution. If the content of the polyethylene oxide is too high, the characteristics of the electrochemical device may be impaired.
- the content of the polyethylene oxide is more preferably 5 ⁇ 10-6 mol / kg or more.
- the electrolytic solution of the present disclosure may further contain a fluorinated saturated cyclic carbonate, an unsaturated cyclic carbonate, an overcharge inhibitor, other known auxiliary agents, and the like as additives. As a result, deterioration of the characteristics of the electrochemical device can be suppressed.
- fluorinated saturated cyclic carbonate examples include the compound represented by the above-mentioned general formula (A). Among them, fluoroethylene carbonate, difluoroethylene carbonate, monofluoromethylethylene carbonate, trifluoromethylethylene carbonate, 2,2,3,3,3-pentafluoropropylethylene carbonate (4- (2,2,3,3) 3-Pentafluoro-propyl)-[1,3] dioxolane-2-one) is preferred.
- fluorinated saturated cyclic carbonate one type may be used alone, or two or more types may be used in combination in any combination and ratio.
- the content of the fluorinated saturated cyclic carbonate is preferably 0.001 to 10% by mass, more preferably 0.01 to 5% by mass, and 0.1 to 3% with respect to the electrolytic solution. It is more preferably by mass%.
- Unsaturated cyclic carbonates include vinylene carbonates, ethylene carbonates substituted with a substituent having an aromatic ring or a carbon-carbon double bond or a carbon-carbon triple bond, phenyl carbonates, vinyl carbonates, allyl carbonates, and the like. Examples thereof include catechol carbonates.
- vinylene carbonates include vinylene carbonate, methyl vinylene carbonate, 4,5-dimethylvinylene carbonate, phenylvinylene carbonate, 4,5-diphenylvinylene carbonate, vinyl vinylene carbonate, 4,5-divinyl vinylene carbonate, allyl vinylene carbonate, 4 , 5-Diallyl vinylene carbonate, 4-fluorovinylene carbonate, 4-fluoro-5-methylvinylene carbonate, 4-fluoro-5-phenylvinylene carbonate, 4-fluoro-5-vinylvinylene carbonate, 4-allyl-5-fluoro Examples thereof include vinylene carbonate, ethynylethylene carbonate, propargylethylene carbonate, methylvinylene carbonate, dimethylvinylene carbonate and the like.
- ethylene carbonates substituted with a substituent having an aromatic ring or a carbon-carbon double bond or a carbon-carbon triple bond include vinyl ethylene carbonate, 4,5-divinylethylene carbonate, and 4-methyl-5.
- unsaturated cyclic carbonates include vinylene carbonate, methylvinylene carbonate, 4,5-dimethylvinylene carbonate, vinyl vinylene carbonate, 4,5-vinylvinylene carbonate, allylvinylene carbonate, 4,5-diallylvinylene carbonate, and vinyl.
- the molecular weight of the unsaturated cyclic carbonate is not particularly limited and is arbitrary as long as the effects of the present disclosure are not significantly impaired.
- the molecular weight is preferably 50 or more and 250 or less. Within this range, the solubility of the unsaturated cyclic carbonate in the electrolytic solution can be easily ensured, and the effects of the present disclosure can be sufficiently exhibited.
- the molecular weight of the unsaturated cyclic carbonate is more preferably 80 or more, and more preferably 150 or less.
- the method for producing the unsaturated cyclic carbonate is not particularly limited, and a known method can be arbitrarily selected for production.
- unsaturated cyclic carbonate one type may be used alone, or two or more types may be used in any combination and ratio.
- the content of the unsaturated cyclic carbonate is not particularly limited and is arbitrary as long as the effects of the present disclosure are not significantly impaired.
- the content of the unsaturated cyclic carbonate is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, and further preferably 0.1% by mass or more in 100% by mass of the electrolytic solution.
- the content is preferably 5% by mass or less, more preferably 4% by mass or less, and further preferably 3% by mass or less.
- the electrochemical device using the electrolytic solution is likely to exhibit a sufficient effect of improving the cycle characteristics, the high temperature storage characteristics are lowered, the amount of gas generated is increased, and the discharge capacity retention rate is lowered. It is easy to avoid such a situation.
- a fluorinated unsaturated cyclic carbonate in addition to the non-fluorinated unsaturated cyclic carbonate as described above, a fluorinated unsaturated cyclic carbonate can also be preferably used.
- the fluorinated unsaturated cyclic carbonate is a cyclic carbonate having an unsaturated bond and a fluorine atom.
- the number of fluorine atoms contained in the fluorinated unsaturated cyclic carbonate is not particularly limited as long as it is 1 or more. Among them, the number of fluorine atoms is usually 6 or less, preferably 4 or less, and one or two are most preferable.
- fluorinated unsaturated cyclic carbonate examples include a fluorinated vinylene carbonate derivative, a fluorinated ethylene carbonate derivative substituted with an aromatic ring or a substituent having a carbon-carbon double bond, and the like.
- fluorinated vinylene carbonate derivative examples include 4-fluorovinylene carbonate, 4-fluoro-5-methylvinylene carbonate, 4-fluoro-5-phenylvinylene carbonate, 4-allyl-5-fluorovinylene carbonate, and 4-fluoro-5-.
- fluorinated vinylene carbonate derivative examples include 4-fluorovinylene carbonate, 4-fluoro-5-methylvinylene carbonate, 4-fluoro-5-phenylvinylene carbonate, 4-allyl-5-fluorovinylene carbonate, and 4-fluoro-5-.
- fluorinated ethylene carbonate derivative substituted with an aromatic ring or a substituent having a carbon-carbon double bond examples include 4-fluoro-4-vinylethylene carbonate, 4-fluoro-4-allylethylene carbonate, and 4-fluoro-5.
- -Vinyl ethylene carbonate 4-fluoro-5-allylethylene carbonate, 4,4-difluoro-4-vinylethylene carbonate, 4,4-difluoro-4-allylethylene carbonate, 4,5-difluoro-4-vinylethylene carbonate , 4,5-Difluoro-4-allylethylene carbonate, 4-fluoro-4,5-divinylethylene carbonate, 4-fluoro-4,5-diallylethylene carbonate, 4,5-difluoro-4,5-divinylethylene carbonate , 4,5-Difluoro-4,5-diallylethylene carbonate, 4-fluoro-4-phenylethylene carbonate, 4-fluoro-5-phenylethylene carbonate, 4,5-difluoro-5-phenylethylene carbonate, 4,5 -Difluoro-4-phenylethylene carbonate and the like can be mentioned.
- fluorinated unsaturated cyclic carbonate 4-fluorovinylene carbonate, 4-fluoro-5-methylvinylene carbonate, 4-fluoro-5-vinylvinylene carbonate, 4-allyl-5-fluorovinylene carbonate, 4- Fluoro-4-vinylethylene carbonate, 4-fluoro-4-allylethylene carbonate, 4-fluoro-5-vinylethylene carbonate, 4-fluoro-5-allylethylene carbonate, 4,4-difluoro-4-vinylethylene carbonate, 4,4-Difluoro-4-allylethylene carbonate, 4,5-difluoro-4-vinylethylene carbonate, 4,5-difluoro-4-allylethylene carbonate, 4-fluoro-4,5-divinylethylene carbonate, 4- Fluoro-4,5-diallylethylene carbonate, 4,5-difluoro-4,5-divinylethylene carbonate, 4,5-difluoro-4,5-diallylethylene carbonate form a fluoro-4,5-
- the molecular weight of the fluorinated unsaturated cyclic carbonate is not particularly limited and is arbitrary as long as the effects of the present disclosure are not significantly impaired.
- the molecular weight is preferably 50 or more and 500 or less. Within this range, it is easy to secure the solubility of the fluorinated unsaturated cyclic carbonate in the electrolytic solution.
- the method for producing the fluorinated unsaturated cyclic carbonate is not particularly limited, and a known method can be arbitrarily selected for production.
- the molecular weight is more preferably 100 or more, and more preferably 200 or less.
- the fluorinated unsaturated cyclic carbonate one type may be used alone, or two or more types may be used in combination in any combination and ratio.
- the content of the fluorinated unsaturated cyclic carbonate is not particularly limited and is arbitrary as long as the effects of the present disclosure are not significantly impaired.
- the content of the fluorinated unsaturated cyclic carbonate is usually 0.001% by mass or more, more preferably 0.01% by mass or more, still more preferably 0.1% by mass or more in 100% by mass of the electrolytic solution. Further, it is preferably 5% by mass or less, more preferably 4% by mass or less, and further preferably 3% by mass or less.
- the electrochemical device using the electrolytic solution is likely to exhibit a sufficient effect of improving the cycle characteristics, the high temperature storage characteristics are lowered, the amount of gas generated is increased, and the discharge capacity retention rate is lowered. It is easy to avoid such a situation.
- the electrolytic solution of the present disclosure may contain a compound having a triple bond.
- the type of the compound is not particularly limited as long as it is a compound having one or more triple bonds in the molecule.
- Specific examples of the compound having a triple bond include the following compounds. 1-Pentyne, 2-Pentyne, 1-Hexyne, 2-Hexyne, 3-Hexyne, 1-Heptyne, 2-Heptyne, 3-Heptyne, 1-Octyne, 2-Octyne, 3-Octyne, 4-Octyne, 1- Nonin, 2-nonin, 3-nonin, 4-nonin, 1-dodecine, 2-dodecine, 3-dodecine, 4-dodecine, 5-dodecin, phenylacetylene, 1-phenyl-1-propine, 1-phenyl-2 -Propin, 1-phenyl-1-butyne, 4-phenyl-1-butyne, 4-phen
- Phosphoric acid (methyl) (2-propenyl) (2-propynyl), phosphoric acid (ethyl) (2-propenyl) (2-propynyl), phosphoric acid (2-butenyl) (methyl) (2-propynyl), phosphoric acid (2-Butenyl) (ethyl) (2-propynyl), phosphoric acid (1,1-dimethyl-2-propynyl) (methyl) (2-propenyl), phosphoric acid (1,1-dimethyl-2-propynyl) ( Ethyl) (2-propenyl), phosphoric acid (2-butenyl) (1,1-dimethyl-2-propynyl) (methyl), and phosphoric acid (2-butenyl) (ethyl) (1,1-dimethyl-2- Phosphate esters such as propynyl);
- a compound having an alkynyloxy group is preferable because it forms a negative electrode film more stably in the electrolytic solution.
- 2- Compounds such as propynyl and di-2-propynyl oxalate are particularly preferable from the viewpoint of improving storage characteristics.
- the compound having a triple bond one type may be used alone, or two or more types may be used in combination in any combination and ratio.
- the amount of the compound having a triple bond to the entire electrolytic solution of the present disclosure is not limited and is arbitrary as long as the effect of the present disclosure is not significantly impaired, but is usually 0.01% by mass or more with respect to the electrolytic solution of the present disclosure. It is preferably contained in a concentration of 0.05% by mass or more, more preferably 0.1% by mass or more, and usually 5% by mass or less, preferably 3% by mass or less, more preferably 1% by mass or less. When the above range is satisfied, the effects such as output characteristics, load characteristics, cycle characteristics, and high temperature storage characteristics are further improved.
- an overcharge inhibitor can be used in order to effectively suppress the explosion and ignition of the battery when the electrochemical device using the electrolytic solution is in a state of overcharging or the like. ..
- overcharge inhibitor examples include unsubstituted or alkyl-substituted terphenyl derivatives such as biphenyl, o-terphenyl, m-terphenyl, and p-terphenyl, and unsubstituted or alkyl-substituted terphenyl derivatives.
- Partial hydride Partial hydride, cyclohexylbenzene, t-butylbenzene, t-amylbenzene, diphenyl ether, dibenzofuran, diphenylcyclohexane, 1,1,3-trimethyl-3-phenylindane, cyclopentylbenzene, cyclohexylbenzene, cumene, 1,3- Aromatic compounds such as diisopropylbenzene, 1,4-diisopropylbenzene, t-butylbenzene, t-amylbenzene, t-hexylbenzene, anisole; 2-fluorobiphenyl, 4-fluorobiphenyl, o-cyclohexylfluorobenzene, p- Partial fluorides of the above aromatic compounds such as cyclohexylfluorobenzene, o-cyclohexylfluorobenzene, p-cyclohe
- Examples thereof include a biphenyl derivative which is unsubstituted or substituted with an alkyl group.
- aromatic compounds such as biphenyl, alkylbiphenyl, terphenyl, partially hydride of terphenyl, cyclohexylbenzene, t-butylbenzene, t-amylbenzene, diphenyl ether and dibenzofuran, diphenylcyclohexane, 1,1,3-trimethyl.
- Overcharge prevention characteristics and high temperature storage characteristics are to be used in combination with at least one selected from oxygen-free aromatic compounds such as t-amylbenzene and at least one selected from oxygen-containing aromatic compounds such as diphenyl ether and dibenzofuran. It is preferable from the viewpoint of the balance of.
- a carboxylic acid anhydride (excluding compound (6)) may be used as the electrolytic solution used in the present disclosure.
- the compound represented by the following general formula (10) is preferable.
- the method for producing the carboxylic acid anhydride is not particularly limited, and a known method can be arbitrarily selected for production.
- R 61 and R 62 each independently represent a hydrocarbon group having 1 or more and 15 or less carbon atoms, which may have a substituent.
- R 61 and R 62 are not particularly limited as long as they are monovalent hydrocarbon groups.
- it may be an aliphatic hydrocarbon group or an aromatic hydrocarbon group, or may be a bond of an aliphatic hydrocarbon group and an aromatic hydrocarbon group.
- the aliphatic hydrocarbon group may be a saturated hydrocarbon group or may contain an unsaturated bond (carbon-carbon double bond or carbon-carbon triple bond).
- the aliphatic hydrocarbon group may be chain-like or cyclic, and in the case of chain-like, it may be linear or branched-chain. Further, it may be a combination of a chain and a ring.
- R 61 and R 62 may be the same as each other or may be different from each other.
- the type of the substituent is not particularly limited as long as it is not contrary to the gist of the present disclosure, and examples thereof include a fluorine atom, a chlorine atom and a bromine atom. , Halogen atom such as iodine atom, preferably fluorine atom.
- examples of the substituent other than the logene atom include a substituent having a functional group such as an ester group, a cyano group, a carbonyl group and an ether group, and a cyano group and a carbonyl group are preferable.
- the hydrocarbon groups of R 61 and R 62 may have only one of these substituents, or may have two or more of them. When having two or more substituents, the substituents may be the same or different from each other.
- the number of carbon atoms of each of the hydrocarbon groups of R 61 and R 62 is usually 1 or more, and is usually 15 or less, preferably 12 or less, more preferably 10 or less, and further preferably 9 or less.
- the number of carbon atoms of the divalent hydrocarbon group is usually 1 or more, and usually 15 or less, preferably 15 or less. It is 13 or less, more preferably 10 or less, still more preferably 8 or less.
- the hydrocarbon groups of R 61 and R 62 have a substituent containing a carbon atom, it is preferable that the total number of carbon atoms of R 61 and R 62 including the substituent satisfies the above range.
- the "related material” refers to an acid anhydride obtained by replacing a part of the structure of the exemplified acid anhydride with another structure within a range not contrary to the purpose of the present disclosure.
- a dimer, a trimeric and a tetramer composed of a plurality of acid anhydrides, or an isostructural heterogeneous substance having the same number of carbon atoms but having a branched chain the substituent is an acid. Examples thereof include those having different sites that bind to the anhydride.
- acid anhydrides in which R 61 and R 62 are chain alkyl groups include acetic anhydride, propionic anhydride, butanoic anhydride, 2-methylpropionic anhydride, and 2,2-dimethylpropionic anhydride.
- R 61 and R 62 are cyclic alkyl groups
- Specific examples of the acid anhydride in which R 61 and R 62 are cyclic alkyl groups include cyclopropanecarboxylic acid anhydride, cyclopentane carboxylic acid anhydride, cyclohexanecarboxylic acid anhydride and the like, and analogs thereof. ..
- acid anhydrides in which R 61 and R 62 are alkenyl groups include acrylic anhydride, 2-methylacrylic anhydride, 3-methylacrylic anhydride, 2,3-dimethylacrylic anhydride, and the like. 3,3-Dimethylacrylic anhydride, 2,3,3-trimethylacrylic anhydride, 2-phenylacrylic anhydride, 3-phenylacrylic anhydride, 2,3-diphenylacrylic anhydride, 3, 3-Diphenylacrylic anhydride, 3-butenoic anhydride, 2-methyl-3-butenoic anhydride, 2,2-dimethyl-3-butenoic anhydride, 3-methyl-3-tenic anhydride, 2-Methyl-3-methyl-3-butenoic anhydride, 2,2-dimethyl-3-methyl-3-butenoic anhydride, 3-pentenoic anhydride, 4-pentenoic anhydride, 2-cyclopentencarboxylic acid Examples thereof include acid anhydrides, 3-cyclopentenecarboxylic acid
- acid anhydrides in which R 61 and R 62 are alkynyl groups include propic acid anhydride, 3-phenylpropic acid anhydride, 2-butynic anhydride, 2-pentinic anhydride, and 3-butynic acid.
- acid anhydrides in which R 61 and R 62 are alkynyl groups include propic acid anhydride, 3-phenylpropic acid anhydride, 2-butynic anhydride, 2-pentinic anhydride, and 3-butynic acid.
- examples thereof include anhydrides, 3-pentyne anhydrides, 4-pentyne anhydrides and the like, and their analogs.
- acid anhydrides in which R 61 and R 62 are aryl groups include benzoic acid anhydride, 4-methylbenzoic acid anhydride, 4-ethylbenzoic acid anhydride, 4-tert-butyl benzoic acid anhydride, and the like.
- examples thereof include 2-methylbenzoic acid anhydride, 2,4,6-trimethylbenzoic acid anhydride, 1-naphthalenecarboxylic acid anhydride, 2-naphthalenecarboxylic acid anhydride and the like, and their analogs.
- an example of an acid anhydride in which R 61 and R 62 are substituted with a halogen atom an example of an acid anhydride in which R 61 and R 62 are mainly substituted with a fluorine atom is given below, and some or all of these fluorine atoms are used.
- An acid anhydride obtained by substituting a chlorine atom, a bromine atom, or an iodine atom is also included in the exemplary compound.
- Examples of acid anhydrides in which R 61 and R 62 are chain alkyl groups substituted with halogen atoms include fluoroacetic anhydride, difluoroacetic anhydride, trifluoroacetic anhydride, 2-fluoropropionic anhydride, and the like.
- Examples of acid anhydrides in which R 61 and R 62 are cyclic alkyl groups substituted with halogen atoms include 2-fluorocyclopentanecarboxylic acid anhydride, 3-fluorocyclopentanecarboxylic acid anhydride, and 4-fluorocyclopentane. Examples thereof include carboxylic acid anhydrides and the like, and their analogs.
- Examples of acid anhydrides in which R 61 and R 62 are alkenyl groups substituted with halogen atoms include 2-fluoroacrylic acid anhydride, 3-fluoroacrylic acid anhydride, 2,3-difluoroacrylic acid anhydride, and so on.
- Examples of acid anhydrides in which R 61 and R 62 are alkynyl groups substituted with halogen atoms include 3-fluoro-2-propic acid anhydride and 3- (4-fluorophenyl) -2-propic acid anhydride. , 3- (2,3,4,5,6-pentafluorophenyl) -2-propynic anhydride, 4-fluoro-2-butynic anhydride, 4,4-difluoro-2-butynic anhydride, Examples thereof include 4,4,4-trifluoro-2-butanoic anhydride and the like, and their analogs.
- R 61 and R 62 are aryl groups substituted with halogen atoms
- 4-fluorobenzoic acid anhydride 2,3,4,5,6-pentafluorobenzoic acid anhydride, 4 -Trifluoromethylbenzoic anhydride and the like, and their analogs and the like can be mentioned.
- Examples of acid anhydrides in which R 61 and R 62 have substituents having functional groups such as esters, nitriles, ketones, and ethers include methoxyhydrides, ethoxygeic anhydrides, and methyloxalate anhydrides.
- Examples of combinations of chain alkyl groups include propionic acetate anhydride, butanoic anhydride, butane propionic anhydride, 2-methylpropionic anhydride, and the like.
- Examples of the combination of the chain alkyl group and the cyclic alkyl group include cyclopentanoic acid anhydride, cyclohexaneic acid acetate anhydride, propionic anhydride, and the like.
- Examples of the combination of the chain alkyl group and the alkenyl group include acrylic anhydride, 3-methylacrylic acetate, 3-butenoic acid anhydride, propionic anhydride and the like.
- Examples of combinations of chain alkyl groups and alkynyl groups include propic acid anhydride, 2-butyrate acetate anhydride, 3-butyrate acetate anhydride, 3-phenylpropic acid anhydride propionate propionic anhydride. , Etc. can be mentioned.
- Examples of the combination of the chain alkyl group and the aryl group include benzoic acid anhydride, 4-methylbenzoic acid anhydride, 1-naphthalenecarboxylic acid anhydride, propionic anhydride and the like.
- Examples of combinations of a chain alkyl group and a hydrocarbon group having a functional group include fluoroacetic acid anhydride, trifluoroacetic acid anhydride, 4-fluorobenzoic acid anhydride, fluoropropionic acid anhydride, and alkyl acetate.
- Examples thereof include oxalic acid anhydride, 2-cyanoacetic acid anhydride, 2-oxopropionic acid acetate, methoxymethoxyacetic acid anhydride, and propionic acid methoxyacetate anhydride.
- Examples of combinations of cyclic alkyl groups include cyclopentanoic acid cyclohexaneic anhydride and the like.
- Examples of combinations of cyclic alkyl groups and alkenyl groups include cyclopentanoic anhydride, 3-methylacrylate cyclopentanoic anhydride, 3-butenoic cyclopentanoic anhydride, cyclohexaneic anhydride, etc. Can be mentioned.
- Examples of the combination of the cyclic alkyl group and the alkynyl group include cyclopentanoic anhydride, 2-butynate cyclopentanoic anhydride, cyclohexaneic anhydride, and the like.
- Examples of the combination of the cyclic alkyl group and the aryl group include cyclopentanoic anhydride of benzoate, cyclopentanoic anhydride of 4-methylbenzoate, cyclohexaneic anhydride of benzoate, and the like.
- Examples of combinations of cyclic alkyl groups and hydrocarbon groups having functional groups include cyclopentanoic anhydride, cyclopentanoic acid trifluoroacetic anhydride, cyclopentanoic 2-cyanoacetic anhydride, and methoxyacetic anhydride.
- Anhydride, cyclohexanoic acid fluoroacetic anhydride, and the like can be mentioned.
- Examples of combinations of alkenyl groups include 2-methylacrylic acid anhydride, 3-methylacrylic acid anhydride, 3-butenoic acid anhydride, and 3-methylacrylic acid anhydride, 2-methylacrylate. Things, etc. can be mentioned.
- Examples of the combination of the alkenyl group and the alkynyl group include acrylic acid propicic anhydride, acrylate 2-butynic anhydride, 2-methylacrylic acid propicic anhydride, and the like.
- Examples of the combination of the alkenyl group and the aryl group include acrylic acid benzoic acid anhydride, acrylic acid 4-methylbenzoic acid anhydride, 2-methylacrylic acid benzoic acid anhydride, and the like.
- Examples of combinations of an alkenyl group and a hydrocarbon group having a functional group include fluoroacetic anhydride, trifluoroacetic anhydride, 2-cyanoacetate anhydride, methoxyacetic anhydride, 2-. Examples thereof include methyl acrylate fluoroacetate anhydride.
- Examples of combinations of alkynyl groups include propanoic acid 2-butynic anhydride, propic acid 3-butynic anhydride, 2-butynic acid 3-butynic anhydride, and the like.
- Examples of the combination of the alkynyl group and the aryl group include benzoic acid propicic anhydride, 4-methylbenzoic acid propicic anhydride, benzoic acid 2-butynic anhydride, and the like.
- Examples of combinations of an alkynyl group and a hydrocarbon group having a functional group include fluoroacetic anhydride, trifluoroacetic anhydride, 2-cyanoacetic anhydride, 2-cyanoacetic anhydride, methoxyacetic anhydride, 2-. Fluoroacetic anhydride, butynate, and the like can be mentioned.
- Examples of combinations of aryl groups include 4-methylbenzoic acid anhydride, 1-naphthalenecarboxylic acid anhydride, 4-methylbenzoic acid 1-naphthalenecarboxylic acid anhydride, and the like.
- Examples of combinations of aryl and functional hydrocarbon groups include fluoroacetate anhydride, trifluoroacetic acid benzoate, 2-cyanoacetate benzoate, methoxyacetate benzoate, 4- Fluoroacetic anhydride of methylbenzoate, etc. may be mentioned.
- hydrocarbon groups having functional groups examples include fluoroacetic acid trifluoroacetic acid anhydride, fluoroacetic acid 2-cyanoacetate anhydride, fluoroacetic acid methoxyacetic acid anhydride, trifluoroacetic acid 2-cyanoacetate anhydride, and the like. Can be mentioned.
- acrylic acids such as acetic anhydride, propionic anhydride, 2-methylpropionic anhydride, cyclopentanecarboxylic acid anhydride, and cyclohexanecarboxylic acid anhydride are preferable.
- These compounds can improve the charge / discharge rate characteristics, input / output characteristics, and impedance characteristics, especially after the durability test, by appropriately forming a bond with the lithium oxalate salt to form a film having excellent durability. It is preferable from the viewpoint of being able to do it.
- the molecular weight of the carboxylic acid anhydride is not limited and is arbitrary as long as the effects of the present disclosure are not significantly impaired, but is usually 90 or more, preferably 95 or more, while usually 300 or less, preferably 200 or less. is there.
- the molecular weight of the carboxylic acid anhydride is within the above range, an increase in the viscosity of the electrolytic solution can be suppressed, and the film density is optimized, so that the durability can be appropriately improved.
- the method for producing the carboxylic acid anhydride is not particularly limited, and a known method can be arbitrarily selected for production.
- the carboxylic acid anhydride described above may contain any one of them alone in the non-aqueous electrolyte solution of the present disclosure, or may contain two or more of them in any combination and ratio.
- the content of the carboxylic acid anhydride in the electrolytic solution of the present disclosure is not particularly limited and is arbitrary as long as the effect of the present disclosure is not significantly impaired, but is usually 0.01 mass by mass with respect to the electrolytic solution of the present disclosure. % Or more, preferably 0.1% by mass or more, and usually 5% by mass or less, preferably 3% by mass or less.
- the content of the carboxylic acid anhydride is within the above range, the effect of improving the cycle characteristics is likely to be exhibited, and since the reactivity is preferable, the battery characteristics are likely to be improved.
- auxiliaries can be used in the electrolytic solution of the present disclosure.
- Other auxiliaries include pentane, heptane, octane, nonane, decane, cycloheptane, benzene, furan, naphthalene, 2-phenylbicyclohexyl, cyclohexane, 2,4,8,10-tetraoxaspiro [5.5].
- Hydrocarbon compounds such as undecane, 3,9-divinyl-2,4,8,10-tetraoxaspiro [5.5] undecane; Fluorobenzene, difluorobenzene, hexafluorobenzene, benzotrifluoride, monofluorobenzene, 1-fluoro-2-cyclohexylbenzene, 1-fluoro-4-tert-butylbenzene, 1-fluoro-3-cyclohexylbenzene, 1-fluoro Fluoro-containing aromatic compounds such as -2-cyclohexylbenzene and fluorinated biphenyl; Carbonate compounds such as erythritan carbonate, spiro-bis-dimethylene carbonate, methoxyethyl-methyl carbonate; Ether compounds such as dioxolane, dioxane, 2,5,8,11-tetraoxadodecane, 2,5,8,11,14-pentaoxapentadecane,
- auxiliary agent a phosphorus-containing compound is preferable, and tris (trimethylsilyl) phosphate and phosphite (tristrimethylsilyl) are preferable.
- the amount of the other auxiliary agent to be blended is not particularly limited and is arbitrary as long as the effects of the present disclosure are not significantly impaired.
- the other auxiliary agent is preferably 0.01% by mass or more and 5% by mass or less in 100% by mass of the electrolytic solution. Within this range, the effects of other auxiliaries are likely to be sufficiently exhibited, and it is easy to avoid situations such as deterioration of battery characteristics such as high load discharge characteristics.
- the blending amount of the other auxiliary agent is more preferably 0.1% by mass or more, further preferably 0.2% by mass or more, still more preferably 3% by mass or less, still more preferably 1% by mass or less. ..
- the electrolytic solution of the present disclosure contains cyclic and chain carboxylic acid esters, ether compounds, nitrogen-containing compounds, boron-containing compounds, organic silicon-containing compounds, nonflammable (flame-retardant) agents, and surfactants as long as the effects of the present disclosure are not impaired.
- An activator, a high dielectricing additive, a cycle property and rate property improving agent, a sulfone compound and the like may be further contained as an additive.
- Examples of the cyclic carboxylic acid ester include those having a total carbon atom number of 3 to 12 in the structural formula. Specific examples thereof include gamma-butyrolactone, gamma-valerolactone, gamma caprolactone, epsilon caprolactone, 3-methyl- ⁇ -butyrolactone and the like. Of these, gamma-butyrolactone is particularly preferable from the viewpoint of improving the characteristics of the electrochemical device due to the improvement in the degree of lithium ion dissociation.
- the blending amount of the cyclic carboxylic acid ester as an additive is usually 0.1% by mass or more, more preferably 1% by mass or more, based on 100% by mass of the solvent. Within this range, the electrical conductivity of the electrolytic solution can be improved, and the large current discharge characteristics of the electrochemical device can be easily improved.
- the blending amount of the cyclic carboxylic acid ester is preferably 10% by mass or less, more preferably 5% by mass or less.
- cyclic carboxylic acid ester a fluorinated cyclic carboxylic acid ester (fluorinated lactone) can also be preferably used.
- fluorine-containing lactone for example, the following formula (C):
- X 15 to X 20 are the same or different, all of which are -H, -F, -Cl, -CH 3 or fluorinated alkyl groups; where at least one of X 15 to X 20 is fluorinated alkyl. Is the basis) Fluorine-containing lactones indicated by.
- Examples of the fluorinated alkyl group in X 15 to X 20 include -CFH 2 , -CF 2 H, -CF 3 , -CH 2 CF 3 , -CF 2 CF 3 , -CH 2 CF 2 CF 3 , and -CF. (CF 3 ) 2 and the like are mentioned, and -CH 2 CF 3 and -CH 2 CF 2 CF 3 are preferable from the viewpoint of high oxidation resistance and safety improving effect.
- X 15 to X 20 is a fluorinated alkyl group
- the -H, -F, -Cl, -CH 3 or fluorinated alkyl group is replaced with only one of X 15 to X 20. It may be replaced with a plurality of places. It is preferably 1 to 3 places, more preferably 1 to 2 places from the viewpoint of good solubility of the electrolyte salt.
- X 17 and / or X 18 is, in particular X 17 or X 18 is a fluorinated alkyl group, inter alia -CH 2 CF 3 , -CH 2 CF 2 CF 3 is preferable.
- X 15 to X 20 other than the fluorinated alkyl group are -H, -F, -Cl or CH 3 , and -H is particularly preferable from the viewpoint of good solubility of the electrolyte salt.
- a or B is CX 226 X 227 (X 226 and X 227 are the same or different, and they all have -H, -F, -Cl, -CF 3 , -CH 3 or a hydrogen atom.
- the fluorine-containing lactone represented by the formula (D) includes the following formula (E):
- Examples of the chain carboxylic acid ester include those having a total carbon number of 3 to 7 in the structural formula. Specifically, methyl acetate, ethyl acetate, -n-propyl acetate, isopropyl acetate, -n-butyl acetate, isobutyl acetate, -t-butyl acetate, methyl propionate, ethyl propionate, -n-propyl propionate, Isobutyl propionate, -n-butyl propionate, methylbutyrate, isobutyl propionate, -t-butyl propionate, methyl butyrate, ethyl butyrate, -n-propyl butyrate, isopropyl butyrate, methyl isobutyrate, ethyl isobutyrate, iso Examples thereof include -n-propyl butyrate and isopropyl isobutyrate.
- methyl acetate, ethyl acetate, -n-propyl acetate, -n-butyl acetate, methyl propionate, ethyl propionate, -n-propyl propionate, isopropyl propionate, methyl butyrate, ethyl butyrate and the like are ions due to a decrease in viscosity. It is preferable from the viewpoint of improving conductivity.
- nitrogen-containing compound examples include nitriles, fluorine-containing nitriles, carboxylic acid amides, fluorine-containing carboxylic acid amides, sulfonic acid amides, and fluorine-containing sulfonic acid amides, acetamides, and formamides.
- 1-methyl-2-pyrrolidinone, 1-methyl-2-piperidone, 3-methyl-2-oxadiridinone, 1,3-dimethyl-2-imidazolidinone, N-methylsuccinimide and the like can also be used.
- the nitrile compounds represented by the general formulas (1a), (1b) and (1c) are not included in the nitrogen-containing compounds.
- boron-containing compound examples include borate esters such as trimethylborate and triethylborate, borate ether, and alkyl borate.
- organosilicon-containing compound examples include (CH 3 ) 4 -Si, (CH 3 ) 3 -Si-Si (CH 3 ) 3 , and silicon oil.
- non-flammable (flame retardant) agent examples include phosphoric acid esters and phosphazene compounds.
- phosphoric acid ester examples include a fluorine-containing alkyl phosphoric acid ester, a non-fluorine-based alkyl phosphoric acid ester, and an aryl phosphoric acid ester.
- a fluorine-containing alkyl phosphate is preferable because it can exert a non-combustible effect even in a small amount.
- the phosphazene-based compounds include, for example, methoxypentafluorocyclotriphosphazene, phenoxypentafluorocyclotriphosphazene, dimethylaminopentafluorocyclotriphosphazene, diethylaminopentafluorocyclotriphosphazene, ethoxypentafluorocyclotriphosphazene, ethoxyheptafluorocyclotetraphosphazene and the like. Can be mentioned.
- fluorine-containing alkyl phosphoric acid ester examples include the fluorine-containing dialkyl phosphoric acid ester described in JP-A-11-233141 and the cyclic alkyl phosphate ester described in JP-A-11-283669. , Or a fluorine-containing trialkyl phosphate ester and the like.
- the surfactant may be any of a cationic surfactant, an anionic surfactant, a nonionic surfactant, and an amphoteric surfactant, but the fluorine atom is good in cycle characteristics and rate characteristics. It is preferable that it contains.
- Examples of the surfactant containing such a fluorine atom include the following formula (30): Rf 5 COO - M + (30) (Wherein, Rf 5 is a fluorine-containing alkyl group which may contain an ether bond having 3 to 10 carbon atoms; M + is Li +, Na +, K + or NHR '3 + (R' are the same or different , Both are H or alkyl groups with 1 to 3 carbon atoms) Fluorine-containing carboxylate represented by and the following formula (40): Rf 6 SO 3 - M + (40) (Wherein, Rf 6 is a fluorine-containing alkyl group which may contain an ether bond having 3 to 10 carbon atoms; M + is Li +, Na +, K + or NHR '3 + (R' are the same or different , Both are H or alkyl groups with 1 to 3 carbon atoms) A fluorine-containing sulfonate represented by is preferable.
- the content of the surfactant is preferably 0.01 to 2% by mass in the electrolytic solution from the viewpoint that the surface tension of the electrolytic solution can be reduced without deteriorating the charge / discharge cycle characteristics.
- high-dielectric additive examples include sulfolane, methyl sulfolane, ⁇ -butyrolactone, ⁇ -valerolactone and the like.
- cycle property and rate property improving agent examples include methyl acetate, ethyl acetate, tetrahydrofuran, 1,4-dioxane and the like.
- electrolytic solution of the present disclosure may be further combined with a polymer material to form a gel-like (plasticized) gel electrolytic solution.
- polymer materials include conventionally known polyethylene oxides and polypropylene oxides and modified products thereof (Japanese Patent Laid-Open Nos. 8-222270 and 2002-100405); polyacrylate-based polymers, polyacrylonitrile, and polyvinylidene fluoride. , Fluororesin such as vinylidene fluoride-hexafluoropropylene copolymer (Japanese Patent Laid-Open No. 4-506726, Japanese Patent Application Laid-Open No. 8-507407, JP-A-10-294131); These fluororesins and hydrocarbons Examples thereof include a composite with a resin (Japanese Patent Laid-Open No.
- the electrolytic solution of the present disclosure may also contain an ionic conductive compound described in Japanese Patent Application No. 2004-301934.
- This ionic conductive compound has the formula (101): A- (D) -B (101) [In the formula, D is the formula (201): -(D1) n- (FAE) m- (AE) p- (Y) q- (201) (In the formula, D1 is the formula (10a):
- Rf is a fluorine-containing ether group which may have a crosslinkable functional group; groups R 10 couples Rf main chain or a bond
- An ether unit having a fluorine-containing ether group in the side chain indicated by; FAE is the equation (10b):
- Rfa is hydrogen atom, a crosslinkable good fluorinated alkyl group optionally having a functional group; R 11 couples Rfa main chain group or a bond
- Ether unit having an alkyl fluorinated group in the side chain indicated by;
- AE is the formula (10c):
- R 13 has a hydrogen atom, an alkyl group which may have a crosslinkable functional group, an aliphatic cyclic hydrocarbon group which may have a crosslinkable functional group, or a crosslinkable functional group. May be aromatic hydrocarbon group; R 12 is a group or bond that binds the main chain to R 13 ) Ether unit indicated by; Y is the formula (10d-1) to (10d-3):
- a and B are the same or different, an alkyl group which may contain a hydrogen atom, a fluorine atom and / or a crosslinkable functional group, a phenyl group which may contain a fluorine atom and / or a crosslinkable functional group, -COOH.
- R is an alkyl group which may contain a hydrogen atom or a fluorine atom and / or a crosslinkable functional group
- an ester group or a carbonate group (however, when D is an oxygen atom, a -COOH group, -OR, not ester group and carbonate group)]
- D is an oxygen atom, a -COOH group, -OR, not ester group and carbonate group
- It is an amorphous fluorine-containing polyether compound having a fluorine-containing group in the side chain represented by.
- the electrolytic solution of the present disclosure may contain a sulfone compound.
- a sulfone compound a cyclic sulfone having 3 to 6 carbon atoms and a chain sulfone having 2 to 6 carbon atoms are preferable.
- the number of sulfonyl groups in one molecule is preferably 1 or 2.
- cyclic sulfone examples include trimethylene sulfones, tetramethylene sulfones, and hexamethylene sulfones, which are monosulfone compounds; and trimethylene disulfones, tetramethylene disulfones, and hexamethylene disulfones, which are disulfone compounds.
- trimethylene sulfones, tetramethylene disulfones, and hexamethylene disulfones which are disulfone compounds.
- tetramethylene sulfones, tetramethylene disulfones, hexamethylene sulfones and hexamethylene disulfones are more preferable, and tetramethylene sulfones (sulfolanes) are particularly preferable.
- sulfolanes As the sulfolanes, sulfolanes and / or sulfolane derivatives (hereinafter, sulfolanes may be abbreviated as "sulfolanes") are preferable.
- the sulfolane derivative is preferably one in which one or more hydrogen atoms bonded on the carbon atom constituting the sulfolane ring are substituted with a fluorine atom or an alkyl group.
- chain sulfone examples include dimethyl sulfone, ethyl methyl sulfone, diethyl sulfone, n-propyl methyl sulfone, n-propyl ethyl sulfone, di-n-propyl sulfone, isopropyl methyl sulfone, isopropyl ethyl sulfone, diisopropyl sulfone, and n-.
- the content of the sulfone compound is not particularly limited and is arbitrary as long as the effects of the present disclosure are not significantly impaired, but is usually 0.3% by volume or more, preferably 0.5% by volume or more in 100% by volume of the above solvent. , More preferably 1% by volume or more, and usually 40% by volume or less, preferably 35% by volume or less, more preferably 30% by volume or less.
- the content of the sulfone compound is within the above range, the effect of improving durability such as cycle characteristics and storage characteristics can be easily obtained, and the viscosity of the non-aqueous electrolyte solution is set within an appropriate range to reduce the electric conductivity. Can be avoided, and the input / output characteristics and charge / discharge rate characteristics of the non-aqueous electrolyte secondary battery can be set in an appropriate range.
- lithium fluorophosphate salts examples include lithium monofluorophosphate (LiPO 3 F) and lithium difluorophosphate (LiPO 2 F 2 ).
- FSO 3 Li lithium monofluorosulfonate
- CH 3 OSO 3 Li lithium methyl sulfate
- C 2 H 5 OSO 3 Li lithium ethyl sulfate
- 2, 2 , 2-Trifluoroethyl lithium sulfate examples include LiPO 2 F 2 , FSO 3 Li, and C 2 H 5 OSO 3 Li are particularly preferable.
- the content of the compound (11) is preferably 0.001 to 20% by mass, more preferably 0.01 to 15% by mass, and 0.1 to 10% by mass with respect to the electrolytic solution. It is more preferably 0.1 to 7% by mass, and particularly preferably 0.1 to 7% by mass.
- additives may be added to the electrolytic solution of the present disclosure.
- additives include metal oxides, glass and the like.
- the electrolytic solution of the present disclosure preferably has a hydrogen fluoride (HF) content of 5 to 200 ppm.
- HF hydrogen fluoride
- the content of HF is more preferably 10 ppm or more, further preferably 20 ppm or more.
- the content of HF is also more preferably 100 ppm or less, further preferably 80 ppm or less, and particularly preferably 50 ppm or less.
- the content of HF can be measured by the neutralization titration method.
- the electrolytic solution of the present disclosure may be prepared by an arbitrary method using the above-mentioned components.
- the electrolytic solution of the present disclosure is an electrolytic solution having stability that can withstand discharge and charging at a high voltage and has a characteristic of suppressing precipitation of metal cations, and is suitably applied to an alkali metal ion secondary battery. Can be done.
- An alkali metal ion secondary battery including a positive electrode, a negative electrode, and the electrolytic solution of the present disclosure is also one of the present disclosures.
- a module including the alkali metal ion secondary battery is also one of the present disclosure.
- the positive electrode is composed of a positive electrode active material layer containing a positive electrode active material and a current collector.
- the positive electrode active material is not particularly limited as long as it can electrochemically occlude and release alkali metal ions, but for example, a substance containing an alkali metal and at least one transition metal is preferable. Specific examples include an alkali metal-containing transition metal composite oxide and an alkali metal-containing transition metal phosphoric acid compound. Among them, as the positive electrode active material, an alkali metal-containing transition metal composite oxide that produces a high voltage is particularly preferable. Examples of the alkali metal ion include lithium ion, sodium ion, potassium ion and the like. In a preferred embodiment, the alkali metal ion can be a lithium ion. That is, in this embodiment, the alkali metal ion secondary battery is a lithium ion secondary battery.
- alkali metal-containing transition metal composite oxide examples include, for example. Equation (3-1): MaMn 2-b M 1 b O 4 (In the formula, M is at least one metal selected from the group consisting of Li, Na and K; 0.9 ⁇ a; 0 ⁇ b ⁇ 1.5; M 1 is Fe, Co, Ni, Lithium-manganese spinel represented by (at least one metal selected from the group consisting of Cu, Zn, Al, Sn, Cr, V, Ti, Mg, Ca, Sr, B, Ga, In, Si and Ge).
- MNi 1-c M 2 c O 2 (In the formula, M is at least one metal selected from the group consisting of Li, Na and K; 0 ⁇ c ⁇ 0.5; M 2 is Fe, Co, Mn, Cu, Zn, Al, A lithium-nickel composite oxide represented by (at least one metal selected from the group consisting of Sn, Cr, V, Ti, Mg, Ca, Sr, B, Ga, In, Si and Ge), or Equation (3-3): MCo 1-d M 3 d O 2 (In the formula, M is at least one metal selected from the group consisting of Li, Na and K; 0 ⁇ d ⁇ 0.5; M 3 is Fe, Ni, Mn, Cu, Zn, Al, At least one metal selected from the group consisting of Sn, Cr, V, Ti, Mg, Ca, Sr, B, Ga, In, Si and Ge) Examples thereof include the lithium-cobalt composite oxide represented by. In the above, M is preferably one kind of metal selected from the group consisting of Li,
- MCoO 2 , MMnO 2 , MNiO 2 , MMn 2 O 4 , MNi 0.8 Co 0.15 Al 0.05 O from the viewpoint of providing an alkali metal ion secondary battery having high energy density and high output.
- 2 or MNi 1/3 Co 1/3 Mn 1/3 O 2 or the like is preferable, and a compound represented by the following formula (3-4) is preferable.
- Examples of the alkali metal-containing transition metal phosphoric acid compound include the following formula (4).
- Me M 4 f (PO 4 ) g (In the formula, M is at least one metal selected from the group consisting of Li, Na and K, and M 4 is selected from the group consisting of V, Ti, Cr, Mn, Fe, Co, Ni and Cu. Examples of the compound represented by 0.5 ⁇ e ⁇ 3, 1 ⁇ f ⁇ 2, 1 ⁇ g ⁇ 3).
- M is preferably one kind of metal selected from the group consisting of Li, Na and K, more preferably Li or Na, and even more preferably Li.
- transition metal of the lithium-containing transition metal phosphoric acid compound V, Ti, Cr, Mn, Fe, Co, Ni, Cu and the like are preferable, and specific examples thereof include, for example, LiFePO 4 , Li 3 Fe 2 (PO 4 ). 3. Iron phosphates such as LiFeP 2 O 7 , cobalt phosphates such as LiCoPO 4 , and some of the transition metal atoms that are the main constituents of these lithium transition metal phosphate compounds are Al, Ti, V, Cr, Mn. , Fe, Co, Li, Ni, Cu, Zn, Mg, Ga, Zr, Nb, Si and the like substituted with other elements. As the lithium-containing transition metal phosphoric acid compound, those having an olivine type structure are preferable.
- positive electrode active materials include MFePO 4 , MNi 0.8 Co 0.2 O 2 , M 1.2 Fe 0.4 Mn 0.4 O 2 , MNi 0.5 Mn 1.5 O 4 , and MV 3. Examples thereof include O 6 and M 2 MnO 3 .
- the positive electrode active material such as MNi 0.5 Mn 1.5 O 4 is crystallized when the alkali metal ion secondary battery is operated at a voltage exceeding 4.4 V or a voltage of 4.6 V or more. It is preferable in that the structure does not collapse.
- an electrochemical device such as an alkali metal ion secondary battery using a positive electrode material containing the positive electrode active material exemplified above is unlikely to decrease in residual capacity and change in resistance increase rate even when stored at a high temperature.
- M 2 MnO 3 and MM 6 O 2 are at least one metal selected from the group consisting of Li, Na and K, and M 6 is Co, Ni. , Mn, Fe, and other transition metals) and solid solution materials.
- the solid solution material is, for example, an alkali metal manganese oxide represented by the general formula Mx [Mn (1-y) M 7 y] Oz.
- M in the formula is at least one metal selected from the group consisting of Li, Na and K
- M 7 is composed of at least one metal element other than M and Mn, for example, Co, Ni. , Fe, Ti, Mo, W, Cr, Zr and Sn contains one or more elements selected from the group.
- the values of x, y, and z in the equation are in the range of 1 ⁇ x ⁇ 2, 0 ⁇ y ⁇ 1, 1.5 ⁇ z ⁇ 3.
- a manganese-containing solid solution material in which LiNiO 2 or LiCoO 2 is solid-dissolved based on Li 2 MnO 3 such as Li 1.2 Mn 0.5 Co 0.14 Ni 0.14 O 2 has a high energy density. It is preferable because it can provide an alkali metal ion secondary battery.
- lithium phosphate in the positive electrode active material because the continuous charging characteristics are improved.
- the use of lithium phosphate is not limited, but it is preferable to use a mixture of the above-mentioned positive electrode active material and lithium phosphate.
- the lower limit of the amount of lithium phosphate used is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, still more preferably 0.5% by mass, based on the total of the positive electrode active material and lithium phosphate. % Or more, and the upper limit is preferably 10% by mass or less, more preferably 8% by mass or less, and further preferably 5% by mass or less.
- a substance having a composition different from that of the positive electrode active material may be used on the surface thereof.
- Surface adhering substances include aluminum oxide, silicon oxide, titanium oxide, zirconium oxide, magnesium oxide, calcium oxide, boron oxide, antimony oxide, bismuth oxide and other oxides, lithium sulfate, sodium sulfate, potassium sulfate, magnesium sulfate, calcium sulfate. , Sulfates such as aluminum sulfate, carbonates such as lithium carbonate, calcium carbonate, magnesium carbonate, carbon and the like.
- These surface-adhering substances are, for example, dissolved or suspended in a solvent and impregnated with the positive electrode active material and dried, or after the surface-adhering substance precursor is dissolved or suspended in a solvent and impregnated with the positive electrode active material. It can be attached to the surface of the positive electrode active material by a method of reacting by heating or the like, a method of adding to the positive electrode active material precursor and firing at the same time, or the like. In addition, when carbon is attached, a method of mechanically attaching carbonaceous material later in the form of activated carbon or the like can also be used.
- the amount of the surface adhering substance is preferably 0.1 ppm or more, more preferably 1 ppm or more, further preferably 10 ppm or more, and the upper limit is preferably 20% or less, more preferably 20% or less, in terms of mass with respect to the positive electrode active material. Is used at 10% or less, more preferably 5% or less.
- the surface adhering substance can suppress the oxidation reaction of the electrolytic solution on the surface of the positive electrode active material and improve the battery life, but if the adhering amount is too small, the effect is not sufficiently exhibited and is often present. If it is too much, the resistance may increase because it inhibits the entry and exit of alkali metal ions.
- Examples of the shape of the particles of the positive electrode active material include lumps, polyhedrons, spheres, elliptical spheres, plates, needles, and columns as conventionally used. Further, the primary particles may be aggregated to form secondary particles.
- the tap density of the positive electrode active material is preferably 0.5 g / cm 3 or more, more preferably 0.8 g / cm 3 or more, and further preferably 1.0 g / cm 3 or more.
- the tap density of the positive electrode active material is less than the above lower limit, the amount of dispersion medium required for forming the positive electrode active material layer increases, and the required amount of the conductive material and the binder increases, so that the positive electrode to the positive electrode active material layer is formed.
- the filling rate of the active material is restricted, and the battery capacity may be restricted.
- the composite oxide powder having a high tap density a high density positive electrode active material layer can be formed. Generally, the larger the tap density is, the more preferable it is, and there is no particular upper limit.
- the upper limit is preferably 4.0 g / cm 3 or less, more preferably 3.7 g / cm 3 or less, and further preferably 3.5 g / cm 3 or less.
- the tap density is the powder packing density (tap density) g / cm 3 when 5 to 10 g of positive electrode active material powder is placed in a 10 ml glass graduated cylinder and tapped 200 times with a stroke of about 20 mm. Ask as.
- the median diameter d50 of the particles of the positive electrode active material is preferably 0.3 ⁇ m or more, more preferably 0.5 ⁇ m or more, still more preferably. Is 0.8 ⁇ m or more, most preferably 1.0 ⁇ m or more, and preferably 30 ⁇ m or less, more preferably 27 ⁇ m or less, still more preferably 25 ⁇ m or less, and most preferably 22 ⁇ m or less. If it falls below the above lower limit, a high tap density product may not be obtained, and if it exceeds the upper limit, it takes time to diffuse lithium in the particles, which causes deterioration of battery performance or preparation of a positive electrode of the battery, that is, an active material.
- the median diameter d50 is measured by a known laser diffraction / scattering particle size distribution measuring device.
- LA-920 manufactured by HORIBA is used as the particle size distribution meter
- a 0.1 mass% sodium hexametaphosphate aqueous solution is used as the dispersion medium used in the measurement, and the measured refractive index is set to 1.24 after ultrasonic dispersion for 5 minutes. Is measured.
- the average primary particle diameter of the positive electrode active material is preferably 0.05 ⁇ m or more, more preferably 0.1 ⁇ m or more, still more preferably 0. It is 2 ⁇ m or more, and the upper limit is preferably 5 ⁇ m or less, more preferably 4 ⁇ m or less, still more preferably 3 ⁇ m or less, and most preferably 2 ⁇ m or less. If it exceeds the above upper limit, it is difficult to form spherical secondary particles, which adversely affects the powder filling property and greatly reduces the specific surface area, so that there is a high possibility that the battery performance such as output characteristics will deteriorate. is there. On the contrary, if it falls below the above lower limit, problems such as inferior reversibility of charge / discharge may occur because the crystal is usually underdeveloped.
- the primary particle size is measured by observation using a scanning electron microscope (SEM). Specifically, in a photograph at a magnification of 10000, the longest value of the intercept by the left and right boundary lines of the primary particles with respect to the horizontal straight line is obtained for any 50 primary particles, and the average value is taken. Be done.
- SEM scanning electron microscope
- BET specific surface area of the positive electrode active material is preferably 0.1 m 2 / g or more, more preferably 0.2 m 2 / g or more, further preferably 0.3 m 2 / g or more, and the upper limit is preferably 50 m 2 / It is g or less, more preferably 40 m 2 / g or less, still more preferably 30 m 2 / g or less. If the BET specific surface area is smaller than this range, the battery performance tends to deteriorate, and if it is large, the tap density does not easily increase, and a problem may easily occur in the coatability at the time of forming the positive electrode active material layer.
- the BET specific surface area is large after pre-drying the sample at 150 ° C. for 30 minutes under nitrogen flow using a surface area meter (for example, a fully automatic surface area measuring device manufactured by Okura Riken Co., Ltd.). It is defined by the value measured by the nitrogen adsorption BET 1-point method by the gas flow method using a nitrogen helium mixed gas accurately adjusted so that the value of the relative pressure of nitrogen with respect to the atmospheric pressure is 0.3.
- the particles of the positive electrode active material are secondary particles.
- the particles of the positive electrode active material preferably contain 0.5 to 7.0% by volume of fine particles having an average particle size of secondary particles of 40 ⁇ m or less and an average primary particle size of 1 ⁇ m or less.
- a general method is used as a method for producing an inorganic compound.
- various methods can be considered for producing a spherical or elliptical spherical active material.
- the raw material of the transition metal is dissolved or pulverized and dispersed in a solvent such as water, and the pH is adjusted while stirring.
- a method of obtaining an active material by preparing and recovering a spherical precursor, drying the precursor as necessary, adding a Li source such as LiOH, Li 2 CO 3 , or LiNO 3 and firing at a high temperature can be mentioned. ..
- the positive electrode active material may be used alone, or two or more kinds having different compositions may be used in any combination or ratio.
- a preferable combination is a combination of LiCoO 2 and LiMn 2 O 4 such as LiNi 0.33 Co 0.33 Mn 0.33 O 2 or a portion of this Mn replaced with another transition metal or the like.
- a combination with LiCoO 2 or a part of this Co substituted with another transition metal or the like can be mentioned.
- the content of the positive electrode active material is preferably 50 to 99.5% by mass, more preferably 80 to 99% by mass of the positive electrode mixture in terms of high battery capacity.
- the content of the positive electrode active material in the positive electrode active material layer is preferably 80% by mass or more, more preferably 82% by mass or more, and particularly preferably 84% by mass or more.
- the upper limit is preferably 99% by mass or less, more preferably 98% by mass or less. If the content of the positive electrode active material in the positive electrode active material layer is low, the electric capacity may be insufficient. On the contrary, if the content is too high, the strength of the positive electrode may be insufficient.
- the positive electrode mixture preferably further contains a binder, a thickener, and a conductive material.
- a binder any material can be used as long as it is a material that is safe for the solvent and electrolytic solution used in electrode production, and for example, polyethylene, polypropylene, polyethylene terephthalate, polymethyl methacrylate, and fragrance.
- Resin-based polymer such as group polyamide, chitosan, alginic acid, polyacrylic acid, polyimide, cellulose, nitrocellulose; SBR (styrene-butadiene rubber), isoprene rubber, butadiene rubber, fluororubber, NBR (acrylonitrile-butadiene rubber), ethylene -Rubber polymer such as propylene rubber; styrene-butadiene-styrene block copolymer or hydrogen additive thereof; EPDM (ethylene-propylene-diene ternary copolymer), styrene-ethylene-butadiene-styrene copolymer, Thermoplastic elastomeric polymers such as styrene / isoprene / styrene block copolymer or hydrogenated products thereof; syndiotactic-1,2-polybutadiene, polyvinyl acetate, ethylene / vinyl acetate cop
- the content of the binder is usually 0.1% by mass or more, preferably 1% by mass or more, more preferably 1.5% by mass or more, as the proportion of the binder in the positive electrode active material layer, and also. It is usually 80% by mass or less, preferably 60% by mass or less, more preferably 40% by mass or less, and most preferably 10% by mass or less. If the proportion of the binder is too low, the positive electrode active material cannot be sufficiently retained, the mechanical strength of the positive electrode is insufficient, and the battery performance such as cycle characteristics may be deteriorated. On the other hand, if it is too high, it may lead to a decrease in battery capacity and conductivity.
- thickener examples include carboxymethyl cellulose, methyl cellulose, hydroxymethyl cellulose, ethyl cellulose, polyvinyl alcohol, oxidized starch, phosphorylated starch, casein, polyvinylpyrrolidone, and salts thereof.
- One type may be used alone, or two or more types may be used in any combination and ratio.
- the ratio of the thickener to the active material is usually 0.1% by mass or more, preferably 0.2% by mass or more, more preferably 0.3% by mass or more, and usually 5% by mass or less, preferably 3%. It is in the range of mass% or less, more preferably 2 mass% or less. Below this range, the coatability may be significantly reduced. If it exceeds, the ratio of the active material in the positive electrode active material layer decreases, which may cause a problem that the capacity of the battery decreases and a problem that the resistance between the positive electrode active materials increases.
- a known conductive material can be arbitrarily used. Specific examples include metal materials such as copper and nickel, graphite such as natural graphite and artificial graphite, carbon black such as acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black, and needle coke. , Carbon nanotubes, fullerene, carbon materials such as amorphous carbon such as VGCF, and the like. It should be noted that one of these may be used alone, or two or more thereof may be used in any combination and ratio.
- the conductive material is usually 0.01% by mass or more, preferably 0.1% by mass or more, more preferably 1% by mass or more, and usually 50% by mass or less, preferably 30% by mass in the positive electrode active material layer. It is used so as to contain% or less, more preferably 15% by mass or less. If the content is lower than this range, the conductivity may be insufficient. On the contrary, if the content is higher than this range, the battery capacity may decrease.
- the solvent for forming the slurry is particularly selected as long as it is a solvent capable of dissolving or dispersing the positive electrode active material, the conductive material, the binder, and the thickener used as required.
- aqueous solvent include water, a mixed medium of alcohol and water, and the like.
- organic solvent include aliphatic hydrocarbons such as hexane; aromatic hydrocarbons such as benzene, toluene, xylene and methylnaphthalene; heterocyclic compounds such as quinoline and pyridine; and ketones such as acetone, methyl ethyl ketone and cyclohexanone.
- esters such as methyl acetate and methyl acrylate
- amines such as diethylenetriamine, N, N-dimethylaminopropylamine
- ethers such as diethyl ether, propylene oxide and tetrahydrofuran (THF); N-methylpyrrolidone (NMP) , Dimethylformamides, dimethylacetamides and the like
- aprotonic polar solvents such as hexamethylphosphalamides and dimethylsulfoxides and the like.
- Examples of the material of the current collector for the positive electrode include metals such as aluminum, titanium, tantalum, stainless steel and nickel, or metal materials such as alloys thereof; carbon materials such as carbon cloth and carbon paper. Of these, metal materials, especially aluminum or alloys thereof, are preferable.
- Examples of the shape of the current collector include metal foil, metal cylinder, metal coil, metal plate, metal thin film, expanded metal, punch metal, foamed metal, etc. in the case of metal material, and carbon plate, carbon in the case of carbon material.
- Examples include thin films and carbon casts. Of these, a metal thin film is preferable.
- the thin film may be formed in a mesh shape as appropriate.
- the thickness of the thin film is arbitrary, but is usually 1 ⁇ m or more, preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, and usually 1 mm or less, preferably 100 ⁇ m or less, more preferably 50 ⁇ m or less. If the thin film is thinner than this range, the strength required as a current collector may be insufficient. On the contrary, if the thin film is thicker than this range, the handleability may be impaired.
- the surface of the current collector is coated with a conductive auxiliary agent from the viewpoint of reducing the electrical contact resistance between the current collector and the positive electrode active material layer.
- a conductive auxiliary agent include carbon and precious metals such as gold, platinum, and silver.
- the ratio of the thickness of the current collector to the positive electrode active material layer is not particularly limited, but the value of (thickness of the positive electrode active material layer on one side immediately before the electrolytic solution injection) / (thickness of the current collector) is 20. It is preferably less than or equal to, more preferably 15 or less, most preferably 10 or less, and preferably 0.5 or more, more preferably 0.8 or more, and most preferably 1 or more. If it exceeds this range, the current collector may generate heat due to Joule heat during high current density charging / discharging. Below this range, the volume ratio of the current collector to the positive electrode active material may increase and the capacity of the battery may decrease.
- the positive electrode may be produced by a conventional method.
- the above-mentioned binder, thickener, conductive material, solvent, etc. are added to the above-mentioned positive electrode active material to form a slurry-like positive electrode mixture, which is applied to a current collector, dried, and then pressed to obtain a high density.
- the high density can be achieved by a hand press, a roller press, or the like.
- Density of the positive electrode active material layer is preferably 1.5 g / cm 3 or more, more preferably 2 g / cm 3 or more, still more preferably 2.2 g / cm 3 or more, preferably 5 g / cm 3 or less, The range is more preferably 4.5 g / cm 3 or less, still more preferably 4 g / cm 3 or less. If it exceeds this range, the permeability of the electrolytic solution to the vicinity of the current collector / active material interface decreases, and the charge / discharge characteristics particularly at a high current density may decrease, so that high output may not be obtained. If it falls below this level, the conductivity between the active materials decreases, the battery resistance increases, and high output may not be obtained.
- the area of the positive electrode active material layer is preferably larger than the outer surface area of the battery outer case from the viewpoint of enhancing the stability at high output and high temperature.
- the total area of the electrode areas of the positive electrode with respect to the surface area of the exterior of the secondary battery is preferably 15 times or more in terms of area ratio, and more preferably 40 times or more.
- the outer surface area of the battery outer case is the total area calculated from the vertical, horizontal, and thickness dimensions of the case part filled with power generation elements excluding the protruding part of the terminal in the case of a bottomed square shape.
- the geometric surface area approximates the case portion filled with the power generation element excluding the protruding portion of the terminal as a cylinder.
- the total electrode area of the positive electrode is the geometric surface area of the positive electrode mixture layer facing the mixture layer containing the negative electrode active material, and in a structure in which the positive electrode mixture layer is formed on both sides via a current collector foil. , Refers to the sum of the areas calculated separately for each surface.
- the thickness of the positive electrode plate is not particularly limited, but from the viewpoint of high capacity and high output, the thickness of the mixture layer obtained by subtracting the metal leaf thickness of the core material is preferable as the lower limit with respect to one side of the current collector. Is 10 ⁇ m or more, more preferably 20 ⁇ m or more, and preferably 500 ⁇ m or less, more preferably 450 ⁇ m or less.
- a substance having a composition different from that attached to the surface of the positive electrode plate may be used.
- Surface adhering substances include aluminum oxide, silicon oxide, titanium oxide, zirconium oxide, magnesium oxide, calcium oxide, boron oxide, antimony oxide, bismuth oxide and other oxides, lithium sulfate, sodium sulfate, potassium sulfate, magnesium sulfate, calcium sulfate. , Sulfates such as aluminum sulfate, carbonates such as lithium carbonate, calcium carbonate, magnesium carbonate, carbon and the like.
- the negative electrode is composed of a negative electrode active material layer containing a negative electrode active material and a current collector.
- the negative electrode contains graphite, a silicon-based material, a tin-based material, or an alkali metal-containing metal composite oxide material.
- the negative electrode active material a carbonaceous material capable of occluding and releasing an organic thermal decomposition product under various thermal decomposition conditions and an alkali metal such as artificial graphite and natural graphite; tin oxide, silicon oxide and the like. It is either a silicon-based material or a tin-based material that can occlude and release an alkali metal; Two or more kinds of these negative electrode active materials may be mixed and used.
- artificial graphite or purified natural graphite produced by high-temperature treatment of easy-to-graphite pitch obtained from various raw materials, or the surface of these graphites with pitch or other organic substances.
- Those obtained by carbonizing after treatment are preferable, and natural graphite, artificial graphite, artificial carbonaceous material, and carbonaceous material obtained by heat-treating artificial graphite material at least once in the range of 400 to 3200 ° C., negative electrode active material layer.
- a carbonaceous material consisting of at least two or more types of graphite having different crystalline properties and / or having an interface in which the different crystalline carbonaceous materials are in contact, the negative electrode active material layer has at least two or more different orientations.
- a material selected from a carbonaceous material having an interface in contact with the graphite is more preferable because it has a good balance between initial irreversible capacitance and high current density charge / discharge characteristics. Further, one of these carbon materials may be used alone, or two or more of these carbon materials may be used in any combination and ratio.
- coal-based coke As the carbonaceous material obtained by heat-treating the above-mentioned artificial carbonaceous substance and artificial graphite substance at least once in the range of 400 to 3200 ° C., coal-based coke, petroleum-based coke, coal-based pitch, petroleum-based pitch, and these pitches are oxidized.
- Treated, needle coke, pitch coke and partially graphitized carbon agents, furnace black, acetylene black, thermal decomposition products of organic substances such as pitch carbon fibers, carbonizable organic substances and their carbonized products, or carbonizable Examples thereof include solutions in which various organic substances are dissolved in low molecular weight organic solvents such as benzene, toluene, xylene, quinoline, and n-hexane, and carbonized products thereof.
- silicon-based materials and tin-based materials Si alone, SiB 4 , SiB 6 , Mg 2 Si, Ni 2 Si, TiSi 2 , MoSi 2 , CoSi 2 , NiSi 2 , CaSi 2 , CrSi 2 , Cu 6 Si, FeSi 2 , MnSi 2 , NbSi 2 , TaSi 2 , VSi 2 , WSi 2 , ZnSi 2 , SiC, Si 3 N 4 , Si 2 N 2 O, SiO v (0 ⁇ v ⁇ 2), LiSiO or tin alone , SnSiO 3 , LiSnO, Mg 2 Sn, SnO w (0 ⁇ w ⁇ 2).
- the second constituent element is, for example, at least one selected from the group consisting of cobalt, iron, magnesium, titanium, vanadium, chromium, manganese, nickel, copper, zinc, gallium and zirconium.
- the third constituent element is, for example, at least one selected from the group consisting of boron, carbon, aluminum and phosphorus.
- the metal material silicon or tin alone (may contain a trace amount of impurities), SiO v (0 ⁇ v ⁇ 2), SnO w (0). ⁇ w ⁇ 2), Si—Co—C composite material, Si—Ni—C composite material, Sn—Co—C composite material, Sn—Ni—C composite material are preferable.
- the alkali metal-containing metal composite oxide material used as the negative electrode active material is not particularly limited as long as it can store and release the alkali metal, but is a material containing titanium and alkali metal from the viewpoint of high current density charge / discharge characteristics.
- an alkali metal-containing composite metal oxide material containing titanium is preferable, and a composite oxide of an alkali metal and titanium (hereinafter, abbreviated as "alkali metal titanium composite oxide”) is preferable. That is, it is particularly preferable to use an alkali metal titanium composite oxide having a spinel structure in a negative electrode active material for an electrolytic solution battery because the output resistance is greatly reduced.
- M is at least one metal selected from the group consisting of Li, Na and K; M 8 is Na, K, Co, Al, Fe, Ti, Mg, Cr, Ga, Cu. , Zn and Nb represents at least one element selected from the group. ] It is preferably a compound represented by.
- M is preferably one kind of metal selected from the group consisting of Li, Na and K, more preferably Li or Na, and even more preferably Li.
- the compound is particularly preferable because it has a good balance of battery performance.
- compositions of the above compounds are M 4/3 Ti 5/3 O 4 in (i), M 1 Ti 2 O 4 in (ii), and M 4/5 Ti 11/5 O 4 in (iii). ..
- M 4/3 Ti 4/3 Al 1/3 O 4 is preferable.
- the negative electrode mixture preferably further contains a binder, a thickener, and a conductive material.
- the binder examples include the same binders that can be used for the positive electrode described above.
- the ratio of the binder to the negative electrode active material is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, particularly preferably 0.6% by mass or more, and preferably 20% by mass or less, 15% by mass. It is more preferably mass% or less, further preferably 10 mass% or less, and particularly preferably 8 mass% or less. If the ratio of the binder to the negative electrode active material exceeds the above range, the ratio of the binder whose amount does not contribute to the battery capacity increases, which may lead to a decrease in the battery capacity. Further, if it falls below the above range, the strength of the negative electrode may decrease.
- the ratio of the binder to the negative electrode active material is usually 0.1% by mass or more, preferably 0.5% by mass or more. , 0.6% by mass or more is more preferable, and usually 5% by mass or less, 3% by mass or less is preferable, and 2% by mass or less is further preferable.
- the ratio to the negative electrode active material is usually 1% by mass or more, preferably 2% by mass or more, and further 3% by mass or more. It is preferable, and usually it is 15% by mass or less, preferably 10% by mass or less, and further preferably 8% by mass or less.
- the thickener examples include the same thickeners that can be used for the positive electrode described above.
- the ratio of the thickener to the negative electrode active material is usually 0.1% by mass or more, preferably 0.5% by mass or more, further preferably 0.6% by mass or more, and usually 5% by mass or less. It is preferably 3% by mass or less, and more preferably 2% by mass or less. If the ratio of the thickener to the negative electrode active material is less than the above range, the coatability may be significantly lowered. On the other hand, if it exceeds the above range, the ratio of the negative electrode active material to the negative electrode active material layer decreases, which may cause a problem of a decrease in battery capacity and an increase in resistance between the negative electrode active materials.
- Examples of the conductive material of the negative electrode include metal materials such as copper and nickel; carbon materials such as graphite and carbon black.
- the solvent for forming the slurry is particularly selected as long as it is a solvent capable of dissolving or dispersing the negative electrode active material, the binder, and the thickener and the conductive material used as needed.
- aqueous solvent include water and alcohol
- organic solvent include N-methylpyrrolidone (NMP), dimethylformamide, dimethylacetamide, methylethylketone, cyclohexanone, methyl acetate, methyl acrylate, diethyltriamine, N, N-.
- Examples thereof include dimethylaminopropylamine, tetrahydrofuran (THF), toluene, acetone, diethyl ether, dimethylacetamide, hexamethylphosphalamide, dimethyl sulfoxide, benzene, xylene, quinoline, pyridine, methylnaphthalene and hexane.
- THF tetrahydrofuran
- toluene acetone
- diethyl ether dimethylacetamide
- hexamethylphosphalamide dimethyl sulfoxide
- benzene xylene
- quinoline pyridine
- methylnaphthalene and hexane examples thereof include dimethylaminopropylamine, tetrahydrofuran (THF), toluene, acetone, diethyl ether, dimethylacetamide, hexamethylphosphalamide, dimethyl sulfoxide, benzene
- Examples of the material of the current collector for the negative electrode include copper, nickel, stainless steel and the like. Of these, copper foil is preferable from the viewpoint of easy processing into a thin film and cost.
- the thickness of the current collector is usually 1 ⁇ m or more, preferably 5 ⁇ m or more, and usually 100 ⁇ m or less, preferably 50 ⁇ m or less. If the thickness of the negative electrode current collector is too thick, the capacity of the entire battery may be reduced too much, and conversely, if it is too thin, handling may be difficult.
- the negative electrode may be manufactured by a conventional method. For example, there is a method in which the above-mentioned binder, thickener, conductive material, solvent and the like are added to the above-mentioned negative electrode material to form a slurry, which is applied to a current collector, dried and then pressed to increase the density. .. Further, when an alloy material is used, a method of forming a thin film layer (negative electrode active material layer) containing the above-mentioned negative electrode active material by a method such as a vapor deposition method, a sputtering method, or a plating method is also used.
- the electrode structure when the negative electrode active material is converted into an electrode is not particularly limited, but the density of the negative electrode active material existing on the current collector is preferably 1 g ⁇ cm -3 or more, and 1.2 g ⁇ cm -3 or more. Is more preferable, 1.3 g ⁇ cm -3 or more is particularly preferable, 2.2 g ⁇ cm -3 or less is preferable, 2.1 g ⁇ cm -3 or less is more preferable, and 2.0 g ⁇ cm -3 or less is more preferable. More preferably, 1.9 g ⁇ cm -3 or less is particularly preferable.
- the density of the negative electrode active material existing on the current collector exceeds the above range, the negative electrode active material particles are destroyed, the initial irreversible capacity increases, and the electrolytic solution near the current collector / negative electrode active material interface High current density charge / discharge characteristics may deteriorate due to a decrease in permeability.
- the conductivity between the negative electrode active materials may decrease, the battery resistance may increase, and the capacity per unit volume may decrease.
- the thickness of the negative electrode plate is designed according to the positive electrode plate to be used and is not particularly limited, but the thickness of the mixture layer after subtracting the metal leaf thickness of the core material is usually 15 ⁇ m or more, preferably 20 ⁇ m or more. , More preferably 30 ⁇ m or more, and usually 300 ⁇ m or less, preferably 280 ⁇ m or less, more preferably 250 ⁇ m or less.
- a substance having a composition different from that attached to the surface of the negative electrode plate may be used.
- Surface adhering substances include aluminum oxide, silicon oxide, titanium oxide, zirconium oxide, magnesium oxide, calcium oxide, boron oxide, antimony oxide, bismuth oxide and other oxides, lithium sulfate, sodium sulfate, potassium sulfate, magnesium sulfate, calcium sulfate. , Sulfates such as aluminum sulfate, carbonates such as lithium carbonate, calcium carbonate, magnesium carbonate and the like.
- the alkali metal ion secondary battery of the present disclosure preferably further includes a separator.
- the material and shape of the separator are not particularly limited as long as they are stable in the electrolytic solution and have excellent liquid retention properties, and known ones can be used. Among them, resins, glass fibers, inorganic substances, etc., which are made of a material stable to the electrolytic solution of the present disclosure, are used, and a porous sheet or a non-woven fabric-like material having excellent liquid retention property is used. preferable.
- the material of the resin and the glass fiber separator for example, polyolefins such as polyethylene and polypropylene, aromatic polyamides, polytetrafluoroethylene, polyether sulfone, glass filters and the like can be used. These materials, such as polypropylene / polyethylene two-layer film and polypropylene / polyethylene / polypropylene three-layer film, may be used alone or in any combination and ratio of two or more.
- the separator is preferably a porous sheet or a non-woven fabric made of a polyolefin such as polyethylene or polypropylene because it has good permeability of the electrolytic solution and a good shutdown effect.
- the thickness of the separator is arbitrary, but is usually 1 ⁇ m or more, preferably 5 ⁇ m or more, more preferably 8 ⁇ m or more, and usually 50 ⁇ m or less, preferably 40 ⁇ m or less, further preferably 30 ⁇ m or less. If the separator is too thin than the above range, the insulating property and mechanical strength may decrease. Further, if it is too thick than the above range, not only the battery performance such as rate characteristics may be deteriorated, but also the energy density of the electrolytic solution battery as a whole may be lowered.
- the porosity of the separator is arbitrary, but is usually 20% or more, preferably 35% or more, still more preferably 45% or more. Further, it is usually 90% or less, preferably 85% or less, and further preferably 75% or less. If the porosity is too small than the above range, the film resistance tends to increase and the rate characteristics tend to deteriorate. On the other hand, if it is larger than the above range, the mechanical strength of the separator tends to decrease and the insulating property tends to decrease.
- the average pore size of the separator is also arbitrary, but is usually 0.5 ⁇ m or less, preferably 0.2 ⁇ m or less, and usually 0.05 ⁇ m or more. If the average pore diameter exceeds the above range, a short circuit is likely to occur. Further, if it falls below the above range, the film resistance may increase and the rate characteristics may deteriorate.
- oxides such as alumina and silicon dioxide
- nitrides such as aluminum nitride and silicon nitride
- sulfates such as barium sulfate and calcium sulfate are used, and those having a particle shape or a fiber shape are used. Used.
- a thin film such as a non-woven fabric, a woven fabric, or a microporous film is used.
- a thin film shape a thin film having a pore diameter of 0.01 to 1 ⁇ m and a thickness of 5 to 50 ⁇ m is preferably used.
- a separator formed by forming a composite porous layer containing the inorganic particles on the surface layer of the positive electrode and / or the negative electrode using a resin binder can be used.
- alumina particles having a 90% particle size of less than 1 ⁇ m are formed on both sides of the positive electrode by using a fluororesin as a binder to form a porous layer.
- the electrode group has a laminated structure in which the positive electrode plate and the negative electrode plate are formed through the separator, and a structure in which the positive electrode plate and the negative electrode plate are spirally wound through the separator. Either may be used.
- the ratio of the volume of the electrode group to the internal volume of the battery (hereinafter referred to as the electrode group occupancy rate) is usually 40% or more, preferably 50% or more, and usually 90% or less, preferably 80% or less. ..
- the battery capacity becomes small. Further, if it exceeds the above range, the void space is small, and the internal pressure rises due to the expansion of the member due to the high temperature of the battery and the increase of the vapor pressure of the liquid component of the electrolyte, and the charge / discharge repetition performance as a battery. In some cases, various characteristics such as high temperature storage may be deteriorated, and a gas discharge valve that releases internal pressure to the outside may operate.
- the current collecting structure is not particularly limited, but in order to more effectively improve the charge / discharge characteristics of high current density by the electrolytic solution of the present disclosure, it is necessary to use a structure that reduces the resistance of the wiring portion and the joint portion. preferable. When the internal resistance is reduced in this way, the effect of using the electrolytic solution of the present disclosure is particularly well exhibited.
- the electrode group has the above-mentioned laminated structure
- a structure formed by bundling the metal core portions of each electrode layer and welding them to the terminals is preferably used.
- the internal resistance becomes large. Therefore, it is also preferably used to reduce the resistance by providing a plurality of terminals in the electrode.
- the internal resistance can be lowered by providing a plurality of lead structures on the positive electrode and the negative electrode and bundling them in the terminals.
- the material of the outer case is not particularly limited as long as it is a substance stable to the electrolytic solution used. Specifically, a nickel-plated steel plate, stainless steel, aluminum or aluminum alloy, metals such as magnesium alloy, or a laminated film (laminated film) of resin and aluminum foil is used. From the viewpoint of weight reduction, aluminum or aluminum alloy metal or laminated film is preferably used.
- the metals are welded together by laser welding, resistance welding, or ultrasonic welding to form a sealed and sealed structure, or the above metals are used to form a caulking structure via a resin gasket. Things can be mentioned.
- Examples of the outer case using the above-mentioned laminated film include a case in which resin layers are heat-sealed to form a sealed and sealed structure.
- a resin different from the resin used for the laminate film may be interposed between the resin layers.
- the resin layer is heat-sealed via the current collecting terminal to form a closed structure, the metal and the resin are bonded to each other. Therefore, a resin having a polar group or a modification in which a polar group is introduced as an intervening resin is introduced. Resin is preferably used.
- the shape of the alkali metal ion secondary battery of the present disclosure is arbitrary, and examples thereof include a cylindrical type, a square type, a laminated type, a coin type, and a large size.
- the shapes and configurations of the positive electrode, the negative electrode, and the separator can be changed and used according to the shape of each battery.
- a module including the alkali metal ion secondary battery of the present disclosure is also one of the present disclosures.
- a positive electrode was prepared in the same manner as the positive electrode 1 except that the positive electrode active material was changed to LiNi 0.8 Co 0.15 Al 0.05 O 2 .
- a positive electrode was produced in the same manner as the positive electrode 1 except that the positive electrode active material was changed to LiNi 0.5 Mn 1.5 O 4 .
- a positive electrode was prepared in the same manner as the positive electrode 1 except that the positive electrode active material was changed to Li 1.2 Mn 0.5 Co 0.14 Ni 0.14 O 2 .
- Manufacturing of negative electrode 1 98 parts by mass of carbonaceous material (graphite), 1 part by mass of aqueous dispersion of sodium carboxymethyl cellulose (concentration of sodium carboxymethyl cellulose 1% by mass) and aqueous dispersion of styrene-butadiene rubber (styrene-) as a thickener and binder. 1 part by mass (50% by mass of butadiene rubber) was added and mixed with a disperser to form a slurry. The obtained slurry was applied to a copper foil having a thickness of 10 ⁇ m, dried, rolled by a press, and cut into a shape having a diameter of 15 ⁇ to obtain a negative electrode.
- styrene- styrene-butadiene rubber
- Negative electrode 3 In 80 parts by mass of lithium titanate (Li 4/3 Ti 5/3 O 4 ), 15% by mass of acetylene black as a conductive material and 5% by mass of PVdF as a binder were added in an N-methylpyrrolidone solvent. It was mixed and made into a slurry. The obtained slurry was applied to a copper foil having a thickness of 10 ⁇ m, dried, rolled by a press, and cut into a shape having a diameter of 15 ⁇ to obtain a negative electrode.
- Negative electrode 4 75 parts by mass of tin-cobalt alloy powder, 20 parts by mass of graphite as a conductive agent and negative electrode active material, 2.5 parts by mass of styrene-butadiene rubber as a binder, and 2.5 parts by mass of carboxymethyl cellulose as a thickener. was mixed and then dispersed in pure water to form a slurry. The obtained slurry was applied to a copper foil having a thickness of 10 ⁇ m, dried, rolled by a press, and cut into a shape having a diameter of 15 ⁇ to obtain a negative electrode.
- Negative electrode 5 93 parts by mass of carbonaceous material (graphite) and 5 parts by mass of silicon, 1 part by mass of aqueous dispersion of sodium carboxymethyl cellulose (1% by mass of sodium carboxymethyl cellulose concentration) and aqueous solution of styrene-butadiene rubber as a thickener and binder. 1 part by mass of dispersion (concentration of styrene-butadiene rubber 50% by mass) was added, and the mixture was mixed with a disperser to form a slurry. It was applied to a copper foil having a thickness of 10 ⁇ m, dried, rolled by a press, and cut into a shape having a diameter of 15 ⁇ to obtain a negative electrode.
- Example 1 Fluoroethylene carbonate (FEC), dimethyl carbonate (DMC) and fluorine-containing ether (I) are mixed at 20/40/40 (volume%), and LiPF 6 is further added to a concentration of 1.0 mol / liter. To prepare a non-aqueous electrolyte solution.
- FEC Fluoroethylene carbonate
- DMC dimethyl carbonate
- I fluorine-containing ether
- the positive electrode 1 and the negative electrode 1 are opposed to each other via a microporous polyethylene film (separator) having a diameter of 25 ⁇ , and the non-aqueous electrolytic solution obtained above is injected, and the non-aqueous electrolytic solution is used as a separator or the like. After sufficient penetration, it was sealed to prepare a bipolar cell.
- the discharge capacity was measured, and the capacity retention rate (%) was determined based on the following formula.
- 5C discharge capacity) / (initial discharge capacity) x 100 capacity retention rate (%)
- 1C represents a current value for discharging the reference capacity of the battery in 1 hour
- 5C represents a current value five times that value
- 0.1C represents a current value 1/10 of the current value.
- Example 2 The battery characteristics were evaluated in the same manner as in Example 1 except that the fluorine-containing ether of Example 1 was changed from (I) to (II).
- Comparative Example 1 Same as in Example 1 except that FEC and DMC were mixed at 30/70 (% by volume), and LiPF 6 was further added to a concentration of 1.0 mol / liter to prepare a non-aqueous electrolyte solution. The battery characteristics were evaluated.
- Comparative Example 2 The battery characteristics were evaluated in the same manner as in Example 1 except that the fluorine-containing ether of Example 1 was changed from (I) to (III).
- Comparative Example 3 The battery characteristics were evaluated in the same manner as in Example 1 except that the fluorine-containing ether of Example 1 was changed from (I) to (IV). The results are shown in Table 1.
- Example 3 Preparation of electrolyte FEC, DMC, and fluorine-containing ether (I) were mixed at 20/40/40 (volume%), and LiPF 6 was further added to a concentration of 1.0 mol / liter to prepare a non-aqueous electrolyte solution. ..
- the positive electrode 1 and the negative electrode 2 are opposed to each other via a microporous polyethylene film (separator) having a diameter of 25 ⁇ , and the non-aqueous electrolytic solution obtained above is injected, and the non-aqueous electrolytic solution is used as a separator or the like. After sufficient penetration, it was sealed to prepare a bipolar cell.
- 1C represents a current value for discharging the reference capacity of the battery in 1 hour
- 3C represents a current value three times that value
- 0.1C represents a current value 1/10 of the current value.
- Example 4 The battery characteristics were evaluated in the same manner as in Example 3 except that the fluorine-containing ether of Example 3 was changed from (I) to (II).
- Example 5 The battery characteristics were evaluated in the same manner as in Example 3 except that the negative electrode 2 of Example 3 was changed to the negative electrode 4.
- Example 6 The battery characteristics were evaluated in the same manner as in Example 5 except that the fluorine-containing ether of Example 5 was changed from (I) to (II).
- Comparative Example 4 The same as in Example 3 except that FEC and DMC were mixed at 30/70 (% by volume), and LiPF 6 was further added to a concentration of 1.0 mol / liter to prepare a non-aqueous electrolyte solution. The battery characteristics were evaluated.
- Comparative Example 5 The battery characteristics were evaluated in the same manner as in Example 3 except that the fluorine-containing ether of Example 3 was changed from (I) to (III).
- Comparative Example 6 The battery characteristics were evaluated in the same manner as in Example 3 except that the fluorine-containing ether of Example 3 was changed from (I) to (IV). The results are shown in Table 2.
- Example 7 Preparation of electrolyte
- PC Propylene carbonate
- DEC diethyl carbonate
- I fluorine-containing ether
- the positive electrode 1 and the negative electrode 3 are opposed to each other via a microporous polyethylene film (separator) having a diameter of 25 ⁇ , and the non-aqueous electrolytic solution obtained above is injected, and the non-aqueous electrolytic solution is used as a separator or the like. After sufficient penetration, it was sealed to prepare a bipolar cell.
- Example 8 The battery characteristics were evaluated in the same manner as in Example 7 except that the fluorine-containing ether of Example 7 was changed from (I) to (II).
- Comparative Example 7 Same as in Example 7 except that PC and DEC were mixed at 30/70 (% by volume), and LiPF 6 was further added to a concentration of 1.0 mol / liter to prepare a non-aqueous electrolyte solution. The battery characteristics were evaluated.
- Comparative Example 8 The battery characteristics were evaluated in the same manner as in Example 7 except that the fluorine-containing ether of Example 7 was changed from (I) to (III).
- Comparative Example 9 The battery characteristics were evaluated in the same manner as in Example 7 except that the fluorine-containing ether of Example 7 was changed from (I) to (IV). The results are shown in Table 3.
- Example 9 Preparation of electrolyte
- Ethylene carbonate (EC), FEC, DMC, and fluorine-containing ether (I) are mixed at 25/5/65/5 (% by volume), and LiPF 6 is further added to a concentration of 1.2 mol / liter.
- a non-aqueous electrolyte solution was prepared.
- the positive electrode 2 and the negative electrode 5 are opposed to each other via a microporous polyethylene film (separator) having a diameter of 25 ⁇ , and the non-aqueous electrolytic solution obtained above is injected, and the non-aqueous electrolytic solution is used as a separator or the like. After sufficient penetration, it was sealed to prepare a bipolar cell.
- Example 10 EC, FEC, DMC, and fluorine-containing ether (I) are mixed at 25/5/60/10 (% by volume), and LiPF 6 is further added to a concentration of 1.2 mol / liter for non-aqueous electrolysis. Battery characteristics were evaluated in the same manner as in Example 9 except that the liquid was prepared.
- Example 11 EC, FEC, DMC, and fluorine-containing ether (I) are mixed at 25/5/50/20 (volume%), and LiPF 6 is further added to a concentration of 1.2 mol / liter for non-aqueous electrolysis. Battery characteristics were evaluated in the same manner as in Example 9 except that the liquid was prepared.
- Example 12 EC, FEC, DMC, and fluorine-containing ether (I) are mixed at 25/5/40/30 (volume%), and LiPF 6 is further added to a concentration of 1.2 mol / liter for non-aqueous electrolysis. Battery characteristics were evaluated in the same manner as in Example 9 except that the liquid was prepared.
- Example 13 The battery characteristics were evaluated in the same manner as in Example 10 except that the fluorine-containing ether of Example 10 was changed from (I) to (II).
- the battery characteristics were evaluated in the same manner as in 9.
- Comparative Example 11 The battery characteristics were evaluated in the same manner as in Example 11 except that the fluorine-containing ether of Example 11 was changed from (I) to (III).
- Comparative Example 12 The battery characteristics were evaluated in the same manner as in Example 11 except that the fluorine-containing ether of Example 11 was changed from (I) to (IV). The results are shown in Table 4.
- Example 14 (Preparation of electrolyte) FEC, fluorine-containing chain carbonate (I) and fluorine-containing ether (I) are mixed at 30/50/20 (volume%), and LiPF 6 is further added to a concentration of 1.2 mol / liter. A non-aqueous electrolyte was prepared.
- the positive electrode 3 and the negative electrode 5 are opposed to each other via a microporous polyethylene film (separator) having a diameter of 25 ⁇ , and the non-aqueous electrolytic solution obtained above is injected, and the non-aqueous electrolytic solution is used as a separator or the like. After sufficient penetration, it was sealed to prepare a bipolar cell.
- Example 15 The battery characteristics were evaluated in the same manner as in Example 14 except that the fluorine-containing ether of Example 14 was changed from (I) to (II).
- Comparative Example 14 The battery characteristics were evaluated in the same manner as in Example 14 except that the fluorine-containing ether of Example 14 was changed from (I) to (III).
- Comparative Example 15 The battery characteristics were evaluated in the same manner as in Example 14 except that the fluorine-containing ether of Example 14 was changed from (I) to (IV).
- Comparative Example 16 The battery characteristics were evaluated in the same manner as in Example 14 except that the fluorine-containing ether of Example 14 was changed from (I) to (V). The results are shown in Table 5.
- Example 16 (Preparation of electrolyte) PC, fluorine-containing chain carbonate (I) and fluorine-containing ether (I) were mixed at 30/40/30 (volume%), and LiPF 6 was further added to a concentration of 1.2 mol / liter. A non-aqueous electrolyte was prepared.
- the positive electrode 4 and the negative electrode 3 are opposed to each other via a microporous polyethylene film (separator) having a diameter of 25 ⁇ , and the non-aqueous electrolytic solution obtained above is injected, and the non-aqueous electrolytic solution is used as a separator or the like. After sufficient penetration, it was sealed to prepare a bipolar cell.
- Example 17 The battery characteristics are the same as in Example 16 except that the fluorine-containing ether of Example 16 is changed from (I) to (II).
- Comparative Example 17 Except that PC and fluorine-containing chain carbonate (I) were mixed at 30/70 (volume%), and LiPF 6 was further added to a concentration of 1.2 mol / liter to prepare a non-aqueous electrolyte solution. The battery characteristics were evaluated in the same manner as in Example 16.
- Comparative Example 18 The battery characteristics were evaluated in the same manner as in Example 16 except that the fluorine-containing ether of Example 16 was changed from (I) to (III).
- Comparative Example 19 The battery characteristics were evaluated in the same manner as in Example 16 except that the fluorine-containing ether of Example 16 was changed from (I) to (IV).
- Comparative Example 20 The battery characteristics were evaluated in the same manner as in Example 16 except that the fluorine-containing ether of Example 16 was changed from (I) to (V). The results are shown in Table 6.
- Example 18 EC, ethyl methyl carbonate (EMC) and fluorine-containing ether (I) are mixed at 30/65/5 (volume%), and LiPF 6 is further added to a concentration of 1.0 mol / liter to make it non-aqueous. An electrolyte was prepared.
- EMC ethyl methyl carbonate
- I fluorine-containing ether
- the positive electrode 5 and the negative electrode 1 are opposed to each other via a microporous polyethylene film (separator) having a diameter of 25 ⁇ , the non-aqueous electrolytic solution obtained above is injected, and the non-aqueous electrolytic solution is used as a separator or the like. After sufficient penetration, it was sealed to prepare a bipolar cell.
- Example 19 The battery characteristics were evaluated in the same manner as in Example 18 except that the fluorine-containing ether of Example 18 was changed from (I) to (II).
- Comparative Example 21 Same as in Example 18 except that EC and EMC were mixed at 30/70 (% by volume) and LiPF 6 was added to a concentration of 1.0 mol / liter to prepare a non-aqueous electrolyte solution. The battery characteristics were evaluated.
- Comparative Example 22 The battery characteristics were evaluated in the same manner as in Example 18 except that the fluorine-containing ether of Example 18 was changed from (I) to (III).
- Comparative Example 23 The battery characteristics were evaluated in the same manner as in Example 18 except that the fluorine-containing ether of Example 18 was changed from (I) to (IV). The results are shown in Table 8.
- the battery using the electrolytic solution of the present disclosure can be used as various power sources such as a portable power source and an automobile power source.
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Abstract
Description
これらの各種電池においては、電解液の性能が電池の性能において大きな影響を与えるものである。
上記正極は、アルカリ金属含有遷移金属複合酸化物及びアルカリ金属含有遷移金属リン酸化合物からなる群より選択される少なくとも一種を含み、
上記負極は、黒鉛、ケイ素系材料、スズ系材料、及び、アルカリ金属含有金属複合酸化物材料からなる群より選択される少なくとも一種を含み、
上記電解液は、下記式(1)で表される化合物及び/又は下記式(2)で表される化合物
MaMn2-bM1 bO4 (3-1)
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり;0.9≦a;0≦b≦1.5;M1はFe、Co、Ni、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、SiおよびGeよりなる群より選択される少なくとも1種の金属)
MNihCoiMnjM5 kO2 (3-4)
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり、M5はFe、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、Si及びGeからなる群より選択される少なくとも1種を示し、(h+i+j+k)=1.0、0≦h≦1.0、0≦i≦1.0、0≦j≦1.5、0≦k≦0.2である。)
MeM4 f(PO4)g (4)
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり、M4はV、Ti、Cr、Mn、Fe、Co、Ni及びCuからなる群より選択される少なくとも1種を示し、0.5≦e≦3、1≦f≦2、1≦g≦3)
上記正極は、アルカリ金属含有遷移金属複合酸化物及びアルカリ金属含有遷移金属リン酸化合物からなる群より選択される少なくとも一種を含み、
上記負極は、黒鉛、ケイ素系材料、スズ系材料、及び、アルカリ金属含有金属複合酸化物材料からなる群より選択される少なくとも一種を含み、
上記電解液は、下記式(1)で表される化合物及び/又は下記式(2)で表される化合物
MaMn2-bM1 bO4 (3-1)
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり;0.9≦a;0≦b≦1.5;M1はFe、Co、Ni、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、SiおよびGeよりなる群より選択される少なくとも1種の金属)
MNihCoiMnjM5 kO2 (3-4)
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり、M5はFe、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、Si及びGeからなる群より選択される少なくとも1種を示し、(h+i+j+k)=1.0、0≦h≦1.0、0≦i≦1.0、0≦j≦1.5、0≦k≦0.2である。)
上記アルカリ金属含有遷移金属リン酸化合物は、下記式(4)で表される化合物であることが好ましい。
MeM4 f(PO4)g (4)
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり、M4はV、Ti、Cr、Mn、Fe、Co、Ni及びCuからなる群より選択される少なくとも1種を示し、0.5≦e≦3、1≦f≦2、1≦g≦3)
本開示は、上述のアルカリ金属イオン二次電池を備えることを特徴とするモジュールでもある。
本開示は、アルカリ金属イオン二次電池において使用するための電解液に関するものである。
現在、アルカリ金属イオン二次電池の負極活物質として、黒鉛等の炭素材料が多く使用されており、更に高エネルギー密度化のため、近年ではより放電容量の大きいSi、SiO、Sn等の合金系活物質等も数多く検討されている。
本開示の電解液は、下記式(1)で表される化合物及び/又は下記式(2)で表される化合物
なお、本明細書において「高電圧」とは、4.2V以上の電圧をいう。また、「高電圧」の上限は4.9Vが好ましい。
なお、本明細書中で「エーテル結合」は、-O-で表される結合である。
炭素数が大きくなりすぎると低温特性が低下したり、電解質塩の溶解性が低下したりするおそれがあり、炭素数が少な過ぎると、電解質塩の溶解性の低下、放電効率の低下、更には粘性の増大等がみられることがある。
R1-R2- (a-1)
(式中、R1はフッ素原子を有していてもよい炭素数1以上のアルキル基;R2はフッ素原子を有していてもよい炭素数1~3のアルキレン基;ただし、R1及びR2の少なくとも一方はフッ素原子を有している)で示されるフッ素化アルキル基が、電解質塩の溶解性が良好な点から好ましく例示できる。
なお、R1及びR2は、更に、炭素原子、水素原子及びフッ素原子以外の、その他の原子を有していてもよい。
-CH2-、-CHF-、-CF2-、-CHCl-、-CFCl-、-CCl2-
-CH2-、-CHF-、-CF2-、-CHCl-、-CFCl-、-CCl2-
R3-(OR4)n1- (b-1)
(式中、R3はフッ素原子を有していてもよい、好ましくは炭素数1~6のアルキル基;R4はフッ素原子を有していてもよい、好ましくは炭素数1~4のアルキレン基;n1は1~3の整数;ただし、R3及びR4の少なくとも1つはフッ素原子を有している)で示されるものが挙げられる。
フッ素化アルキル基(a)、エーテル結合を有するフッ素化アルキル基(b)、及び、フッ素化アルコキシ基(c)のフッ素含有率は、各基の構造式に基づいて、{(フッ素原子の個数×19)/各基の式量}×100(%)により算出した値である。
なお、上記フッ素化飽和環状カーボネートのフッ素含有率は、フッ素化飽和環状カーボネートの構造式に基づいて、{(フッ素原子の個数×19)/フッ素化飽和環状カーボネートの分子量}×100(%)により算出した値である。
Rf2OCOOR7 (B)
(式中、Rf2は、炭素数1~7のフッ素化アルキル基であり、R7は、炭素数1~7のフッ素原子を含んでいてもよいアルキル基である。)で示される化合物を挙げることができる。
上記フッ素化アルキル基は、アルキル基が有する水素原子の少なくとも1つをフッ素原子で置換したものである。R7がフッ素原子を含むアルキル基である場合、フッ素化アルキル基となる。
Rf2及びR7は、低粘性である点で、炭素数が1~7であることが好ましく、1~2であることがより好ましい。
炭素数が大きくなりすぎると低温特性が低下したり、電解質塩の溶解性が低下したりするおそれがあり、炭素数が少な過ぎると、電解質塩の溶解性の低下、放電効率の低下、更には粘性の増大等がみられることがある。
R1-R2- (d-1)
(式中、R1はフッ素原子を有していてもよい炭素数1以上のアルキル基;R2はフッ素原子を有していてもよい炭素数1~3のアルキレン基;ただし、R1及びR2の少なくとも一方はフッ素原子を有している)で示されるフッ素化アルキル基が、電解質塩の溶解性が良好な点から好ましく例示できる。
なお、R1及びR2は、更に、炭素原子、水素原子及びフッ素原子以外の、その他の原子を有していてもよい。
-CH2-、-CHF-、-CF2-、-CHCl-、-CFCl-、-CCl2-
なお、本開示においてフッ素含有率は、上記フッ素化鎖状カーボネートの構造式に基づいて、
{(フッ素原子の個数×19)/フッ素化鎖状カーボネートの分子量}×100(%)
により算出した値である。
R31COOR32
(式中、R31及びR32は、互いに独立に、炭素数1~4のフッ素原子を含んでいてもよいアルキル基であり、R31及びR32の少なくとも一方はフッ素原子を含む。)で示されるフッ素化鎖状カルボン酸エステルが、他溶媒との相溶性や耐酸化性が良好な点から好ましい。
なかでもCF3CH2C(=O)OCH3、HCF2C(=O)OCH3、HCF2C(=O)OC2H5、CF3C(=O)OCH2C2F5、CF3C(=O)OCH2CF2CF2H、CF3C(=O)OCH2CF3、CF3C(=O)OCH(CF3)2、ペンタフルオロ酪酸エチル、ペンタフルオロプロピオン酸メチル、ペンタフルオロプロピオン酸エチル、ヘプタフルオロイソ酪酸メチル、トリフルオロ酪酸イソプロピル、トリフルオロ酢酸エチル、トリフルオロ酢酸tert-ブチル、トリフルオロ酢酸n-ブチル、テトラフルオロ-2-(メトキシ)プロピオン酸メチル、酢酸2,2-ジフルオロエチル、酢酸2,2,3,3-テトラフルオロプロピル、CH3C(=O)OCH2CF3、酢酸1H,1H-ヘプタフルオロブチル、4,4,4-トリフルオロ酪酸メチル、4,4,4-トリフルオロ酪酸エチル、3,3,3-トリフルオロプロピオン酸エチル、3,3,3-トリフルオロプロピオン酸3,3,3-トリフルオロプロピル、3-(トリフルオロメチル)酪酸エチル、2,3,3,3-テトラフルオロプロピオン酸メチル、2,2-ジフルオロ酢酸ブチル、2,2,3,3-テトラフルオロプロピオン酸メチル、2-(トリフルオロメチル)-3,3,3-トリフルオロプロピオン酸メチル、ヘプタフルオロ酪酸メチルが、他溶媒との相溶性及びレート特性が良好な点から好ましく、CF3CH2C(=O)OCH3、HCF2C(=O)OCH3、HCF2C(=O)OC2H5、CH3C(=O)OCH2CF3がより好ましく、HCF2C(=O)OCH3、HCF2C(=O)OC2H5、CH3C(=O)OCH2CF3が特に好ましい。
上記エーテル化合物としては、炭素数2~10の鎖状エーテル、及び炭素数3~6の環状エーテルが好ましい。
炭素数2~10の鎖状エーテルとしては、ジメチルエーテル、ジエチルエーテル、ジ-n-ブチルエーテル、ジメトキシメタン、メトキシエトキシメタン、ジエトキシメタン、ジメトキシエタン、メトキシエトキシエタン、ジエトキシエタン、エチレングリコールジ-n-プロピルエーテル、エチレングリコールジ-n-ブチルエーテル、ジエチレングリコール、ジエチレングリコールジメチルエーテル、ペンタエチレングリコール、トリエチレングリコールジメチルエーテル、トリエチレングリコール、テトラエチレングリコール、テトラエチレングリコールジメチルエーテル、ジイソプロピルエーテル等が挙げられる。
上記フッ素化エーテルとしては、下記一般式(I):
Rf3-O-Rf4 (I)
(式中、Rf3及びRf4は同じか又は異なり、炭素数1~10のアルキル基又は炭素数1~10のフッ素化アルキル基である。ただし、Rf3及びRf4の少なくとも一方は、フッ素化アルキル基である。)
で表されるフッ素化エーテル(I)が挙げられる。フッ素化エーテル(I)を含有させることにより、電解液の難燃性が向上するとともに、高温高電圧での安定性、安全性が向上する。
なかでも、Rf3及びRf4が、同じか又は異なり、Rf3が炭素数3~6のフッ素化アルキル基であり、かつ、Rf4が炭素数2~6のフッ素化アルキル基であることがより好ましい。
上記フッ素含有率の下限は、45質量%がより好ましく、50質量%が更に好ましく、55質量%が特に好ましい。上限は70質量%がより好ましく、66質量%が更に好ましい。
なお、フッ素化エーテル(I)のフッ素含有率は、フッ素化エーテル(I)の構造式に基づいて、{(フッ素原子の個数×19)/フッ素化エーテル(I)の分子量}×100(%)により算出した値である。
なかでも、高沸点、他の溶媒との相溶性や電解質塩の溶解性が良好な点で有利なことから、HCF2CF2CH2OCF2CFHCF3(沸点106℃)、CF3CF2CH2OCF2CFHCF3(沸点82℃)、HCF2CF2CH2OCF2CF2H(沸点92℃)及びCF3CF2CH2OCF2CF2H(沸点68℃)からなる群より選択される少なくとも1種であることが好ましく、HCF2CF2CH2OCF2CFHCF3(沸点106℃)及びHCF2CF2CH2OCF2CF2H(沸点92℃)からなる群より選択される少なくとも1種であることがより好ましい。
上記の組成の溶媒を含有する電解液は、電気化学デバイスの高温保存特性やサイクル特性を一層向上させることができる。
上記溶媒の含有量は、電解液中70~99.999質量%であることが好ましく、80質量%以上がより好ましく、92質量%以下がより好ましい。
(式中、Aa+は金属イオン、水素イオン又はオニウムイオン。aは1~3の整数、bは1~3の整数、pはb/a、n203は1~4の整数、n201は0~8の整数、n202は0又は1、Z201は遷移金属、周期律表のIII族、IV族又はV族の元素。
X201は、O、S、炭素数1~10のアルキレン基、炭素数1~10のハロゲン化アルキレン基、炭素数6~20のアリーレン基又は炭素数6~20のハロゲン化アリーレン基(アルキレン基、ハロゲン化アルキレン基、アリーレン基、及び、ハロゲン化アリーレン基はその構造中に置換基、ヘテロ原子を持っていてもよく、またn202が1でn203が2~4のときにはn203個のX201はそれぞれが結合していてもよい)。
L201は、ハロゲン原子、シアノ基、炭素数1~10のアルキル基、炭素数1~10のハロゲン化アルキル基、炭素数6~20のアリール基、炭素数6~20のハロゲン化アリール基(アルキレン基、ハロゲン化アルキレン基、アリーレン基、及び、ハロゲン化アリーレン基はその構造中に置換基、ヘテロ原子を持っていてもよく、またn201が2~8のときにはn201個のL201はそれぞれが結合して環を形成してもよい)又は-Z203Y203。
Y201、Y202及びZ203は、それぞれ独立でO、S、NY204、炭化水素基又はフッ素化炭化水素基。Y203及びY204は、それぞれ独立でH、F、炭素数1~10のアルキル基、炭素数1~10のハロゲン化アルキル基、炭素数6~20のアリール基又は炭素数6~20のハロゲン化アリール基(アルキル基、ハロゲン化アルキル基、アリール基及びハロゲン化アリール基はその構造中に置換基、ヘテロ原子を持っていてもよく、Y203又はY204が複数個存在する場合にはそれぞれが結合して環を形成してもよい)。
なお、本明細書において、フッ素化炭化水素基は、炭化水素基の水素原子の少なくとも1つがフッ素原子に置換された基である。
化合物(5)としては、リチウムビス(オキサラト)ボレートが特に好ましい。
上記リチウム塩として任意のものを用いることができ、具体的には以下のものが挙げられる。例えば、LiPF6、LiBF4、LiClO4、LiAlF4、LiSbF6、LiTaF6、LiWF7、LiAsF6,LiAlCl4,LiI、LiBr、LiCl、LiB10Cl10、Li2SiF6、Li2PFO3、LiPO2F2等の無機リチウム塩;
LiWOF5等のタングステン酸リチウム類;
HCO2Li、CH3CO2Li、CH2FCO2Li、CHF2CO2Li、CF3CO2Li、CF3CH2CO2Li、CF3CF2CO2Li、CF3CF2CF2CO2Li、CF3CF2CF2CF2CO2Li等のカルボン酸リチウム塩類;
FSO3Li、CH3SO3Li、CH2FSO3Li、CHF2SO3Li、CF3SO3Li、CF3CF2SO3Li、CF3CF2CF2SO3Li、CF3CF2CF2CF2SO3Li、リチウムメチルサルフェート、リチウムエチルサルフェート(C2H5OSO3Li)、リチウム2,2,2-トリフルオロエチルサルフェート等のS=O基を有するリチウム塩類;
LiN(FCO)2、LiN(FCO)(FSO2)、LiN(FSO2)2、LiN(FSO2)(CF3SO2)、LiN(CF3SO2)2、LiN(C2F5SO2)2、リチウムビスパーフルオロエタンスルホニルイミド、リチウム環状1,2-パーフルオロエタンジスルホニルイミド、リチウム環状1,3-パーフルオロプロパンジスルホニルイミド、リチウム環状1,2-エタンジスルホニルイミド、リチウム環状1,3-プロパンジスルホニルイミド、リチウム環状1,4-パーフルオロブタンジスルホニルイミド、LiN(CF3SO2)(FSO2)、LiN(CF3SO2)(C3F7SO2)、LiN(CF3SO2)(C4F9SO2)、LiN(POF2)2等のリチウムイミド塩類;
LiC(FSO2)3、LiC(CF3SO2)3、LiC(C2F5SO2)3等のリチウムメチド塩類;
その他、式:LiPFa(CnF2n+1)6-a(式中、aは0~5の整数であり、nは1~6の整数である)で表される塩(例えばLiPF3(C2F5)3、LiPF3(CF3)3、LiPF3(iso-C3F7)3、LiPF5(iso-C3F7)、LiPF4(CF3)2、LiPF4(C2F5)2)、LiPF4(CF3SO2)2、LiPF4(C2F5SO2)2、LiBF3CF3、LiBF3C2F5、LiBF3C3F7、LiBF2(CF3)2、LiBF2(C2F5)2、LiBF2(CF3SO2)2、LiBF2(C2F5SO2)2等の含フッ素有機リチウム塩類、LiSCN、LiB(CN)4、LiB(C6H5)4、Li2(C2O4)、LiP(C2O4)3、Li2B12FbH12-b(bは0~3の整数)等が挙げられる。
Y21及びZ21が複数存在する場合、複数存在するY21及びZ21は同じであっても異なっていてもよい。
Z21としては、H-、F-、CH3-、CH3CH2-、CH3CH2CH2-、CF3-、CF3CF2-、CH2FCH2-及びCF3CF2CF2-からなる群より選択される少なくとも1種が好ましい。
これにより、電気化学デバイスの高温保存特性を向上させることができる。上記ニトリル化合物を単独で用いてもよく、2種以上を任意の組み合わせ及び比率で併用してもよい。
ハロゲン原子としては、例えば、フッ素原子、塩素原子、臭素原子、ヨウ素原子が挙げられる。中でもフッ素原子が好ましい。
アルキル基としては、炭素数1~5のものが好ましい。アルキル基の具体例としては、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、tert-ブチル基等が挙げられる。
アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基としては、上述したアルキル基の少なくとも一部の水素原子を上述したハロゲン原子で置換した基が挙げられる。
Ra及びRbがアルキル基、又は、アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基である場合は、RaとRbとが互いに結合して環構造(例えば、シクロヘキサン環)を形成していてもよい。
Ra及びRbは、水素原子又はアルキル基であることが好ましい。
ジニトリルの具体例としては、マロノニトリル、スクシノニトリル、グルタロニトリル、アジポニトリル、ピメロニトリル、スベロニトリル、アゼラニトリル、セバコニトリル、ウンデカンジニトリル、ドデカンジニトリル、メチルマロノニトリル、エチルマロノニトリル、イソプロピルマロノニトリル、tert-ブチルマロノニトリル、メチルスクシノニトリル、2,2-ジメチルスクシノニトリル、2,3-ジメチルスクシノニトリル、2,3,3-トリメチルスクシノニトリル、2,2,3,3-テトラメチルスクシノニトリル、2,3-ジエチル-2,3-ジメチルスクシノニトリル、2,2-ジエチル-3,3-ジメチルスクシノニトリル、ビシクロヘキシル-1,1-ジカルボニトリル、ビシクロヘキシル-2,2-ジカルボニトリル、ビシクロヘキシル-3,3-ジカルボニトリル、2,5-ジメチル-2,5-ヘキサンジカルボニトリル、2,3-ジイソブチル-2,3-ジメチルスクシノニトリル、2,2-ジイソブチル-3,3-ジメチルスクシノニトリル、2-メチルグルタロニトリル、2,3-ジメチルグルタロニトリル、2,4-ジメチルグルタロニトリル、2,2,3,3-テトラメチルグルタロニトリル、2,2,4,4-テトラメチルグルタロニトリル、2,2,3,4-テトラメチルグルタロニトリル、2,3,3,4-テトラメチルグルタロニトリル、1,4-ジシアノペンタン、2,6-ジシアノヘプタン、2,7-ジシアノオクタン、2,8-ジシアノノナン、1,6-ジシアノデカン、1,2-ジジアノベンゼン、1,3-ジシアノベンゼン、1,4-ジシアノベンゼン、3,3’-(エチレンジオキシ)ジプロピオニトリル、3,3’-(エチレンジチオ)ジプロピオニトリル、3,9-ビス(2-シアノエチル)-2,4,8,10-テトラオキサスピロ[5,5]ウンデカン、ブタンニトリル、フタロニトリル等を例示できる。これらのうち、特に好ましいのはスクシノニトリル、グルタロニトリル、アジポニトリルである。
また、トリカルボニトリルの具体例としては、ペンタントリカルボニトリル、プロパントリカルボニトリル、1,3,5-ヘキサントリカルボニトリル、1,3,6-ヘキサントリカルボニトリル、ヘプタントリカルボニトリル、1,2,3-プロパントリカルボニトリル、1,3,5-ペンタントリカルボニトリル、シクロヘキサントリカルボニトリル、トリスシアノエチルアミン、トリスシアノエトキシプロパン、トリシアノエチレン、トリス(2-シアノエチル)アミン等が挙げられ特に好ましいものは、1,3,6-ヘキサントリカルボニトリル、シクロヘキサントリカルボニトリルであり、最も好ましいものはシクロヘキサントリカルボニトリルである。
ハロゲン原子、アルキル基、及び、アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基については、上記一般式(9a)について例示したものが挙げられる。
上記NC-Rc1-Xc1-におけるRc1はアルキレン基である。アルキレン基としては、炭素数1~3のアルキレン基が好ましい。
Rc、Rd及びReは、それぞれ独立して、水素原子、ハロゲン原子、アルキル基、又は、アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基であることが好ましい。
Rc、Rd及びReの少なくとも1つは、ハロゲン原子、又は、アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基であることが好ましく、フッ素原子、又は、アルキル基の少なくとも一部の水素原子をフッ素原子で置換した基であることがより好ましい。
Rd及びReがアルキル基、又は、アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基である場合は、RdとReとが互いに結合して環構造(例えば、シクロヘキサン環)を形成していてもよい。
ハロゲン原子、アルキル基、及び、アルキル基の少なくとも一部の水素原子をハロゲン原子で置換した基については、上記一般式(9a)について例示したものが挙げられる。
シアノ基を含む基としては、シアノ基のほか、アルキル基の少なくとも一部の水素原子をシアノ基で置換した基が挙げられる。この場合のアルキル基としては、上記一般式(9a)について例示したものが挙げられる。
Rf、Rg、Rh及びRiのうち少なくとも1つはシアノ基を含む基である。好ましくは、Rf、Rg、Rh及びRiのうち少なくとも2つがシアノ基を含む基であることであり、より好ましくは、Rh及びRiがシアノ基を含む基であることである。Rh及びRiがシアノ基を含む基である場合、Rf及びRgは、水素原子であることが好ましい。
このような化合物を含有することにより、電極界面の安定性が向上し、電気化学デバイスの特性を向上させることができる。
上記ポリエチレンオキシドとしては、例えば、ポリエチレンオキシドモノオール、ポリエチレンオキシドカルボン酸、ポリエチレンオキシドジオール、ポリエチレンオキシドジカルボン酸、ポリエチレンオキシドトリオール、ポリエチレンオキシドトリカルボン酸等が挙げられる。これらは単独で使用してもよいし、2種以上を併用してもよい。
なかでも、電気化学デバイスの特性がより良好となる点で、ポリエチレンオキシドモノオールとポリエチレンオキシドジオールの混合物、及び、ポリエチレンカルボン酸とポリエチレンジカルボン酸の混合物であることが好ましい。
上記重量平均分子量は、ゲルパーミエーションクロマトグラフィー(GPC)法によるポリスチレン換算により測定することができる。
上記ポリエチレンオキシドの含有量は、5×10-6mol/kg以上であることがより好ましい。
フッ素化不飽和環状カーボネートは、不飽和結合とフッ素原子とを有する環状カーボネートである。フッ素化不飽和環状カーボネートが有するフッ素原子の数は1以上があれば、特に制限されない。中でもフッ素原子が通常6以下、好ましくは4以下であり、1個又は2個のものが最も好ましい。
三重結合を有する化合物の具体例としては、例えば、以下の化合物が挙げられる。
1-ペンチン、2-ペンチン、1-ヘキシン、2-ヘキシン、3-ヘキシン、1-ヘプチン、2-ヘプチン、3-ヘプチン、1-オクチン、2-オクチン、3-オクチン、4-オクチン、1-ノニン、2-ノニン、3-ノニン、4-ノニン、1-ドデシン、2-ドデシン、3-ドデシン、4-ドデシン、5-ドデシン、フェニルアセチレン、1-フェニル-1-プロピン、1-フェニル-2-プロピン、1-フェニル-1-ブチン、4-フェニル-1-ブチン、4-フェニル-1-ブチン、1-フェニル-1-ペンチン、5-フェニル-1-ペンチン、1-フェニル-1-ヘキシン、6-フェニル-1-ヘキシン、ジフェニルアセチレン、4-エチニルトルエン、ジシクロヘキシルアセチレン等の炭化水素化合物;
フルオロベンゼン、ジフルオロベンゼン、ヘキサフルオロベンゼン、ベンゾトリフルオライド、モノフルオロベンゼン、1-フルオロ-2-シクロヘキシルベンゼン、1-フルオロ-4-tert-ブチルベンゼン、1-フルオロ-3-シクロヘキシルベンゼン、1-フルオロ-2-シクロヘキシルベンゼン、フッ素化ビフェニル等の含フッ素芳香族化合物;
エリスリタンカーボネート、スピロ-ビス-ジメチレンカーボネート、メトキシエチル-メチルカーボネート等のカーボネート化合物;
ジオキソラン、ジオキサン、2,5,8,11-テトラオキサドデカン、2,5,8,11,14-ペンタオキサペンタデカン、エトキシメトキシエタン、トリメトキシメタン、グライム、エチルモノグライム等のエーテル系化合物;
ジメチルケトン、ジエチルケトン、3-ペンタノン等のケトン系化合物;
2-アリル無水コハク酸等の酸無水物;
シュウ酸ジメチル、シュウ酸ジエチル、シュウ酸エチルメチル、シュウ酸ジ(2-プロピニル)、シュウ酸メチル2-プロピニル、コハク酸ジメチル、グルタル酸ジ(2-プロピニル)、ギ酸メチル、ギ酸エチル、ギ酸2-プロピニル、2-ブチン-1,4-ジイルジホルメート、メタクリル酸2-プロピニル、マロン酸ジメチル等のエステル化合物;
アセトアミド、N-メチルホルムアミド、N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド等のアミド系化合物;
硫酸エチレン、硫酸ビニレン、亜硫酸エチレン、フルオロスルホン酸メチル、フルオロスルホン酸エチル、メタンスルホン酸メチル、メタンスルホン酸エチル、ブスルファン、スルホレン、ジフェニルスルホン、N,N-ジメチルメタンスルホンアミド、N,N-ジエチルメタンスルホンアミド、ビニルスルホン酸メチル、ビニルスルホン酸エチル、ビニルスルホン酸アリル、ビニルスルホン酸プロパルギル、アリルスルホン酸メチル、アリルスルホン酸エチル、アリルスルホン酸アリル、アリルスルホン酸プロパルギル、1,2-ビス(ビニルスルホニロキシ)エタン、無水プロパンジスルホン酸、無水スルホ酪酸、無水スルホ安息香酸、無水スルホプロピオン酸、無水エタンジスルホン酸、メチレンメタンジスルホネート、メタンスルホン酸2-プロピニル、ペンテンサルファイト、ペンタフルオロフェニルメタンスルホネート、プロピレンサルフェート、プロピレンサルファイト、プロパンサルトン、ブチレンサルファイト、ブタン-2,3-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、ビニルスルホン酸2-プロピニル、ビス(2-ビニルスルホニルエチル)エーテル、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、2-(メタンスルホニルオキシ)プロピオン酸2-プロピニル、5,5-ジメチル-1,2-オキサチオラン-4-オン2,2-ジオキシド、3-スルホ-プロピオン酸無水物トリメチレンメタンジスルホネート2-メチルテトラヒドロフラン、トリメチレンメタンジスルホネート、テトラメチレンスルホキシド、ジメチレンメタンジスルホネート、ジフルオロエチルメチルスルホン、ジビニルスルホン、1,2-ビス(ビニルスルホニル)エタン、エチレンビススルホン酸メチル、エチレンビススルホン酸エチル、エチレンサルフェート、チオフェン1-オキシド等の含硫黄化合物;
1-メチル-2-ピロリジノン、1-メチル-2-ピペリドン、3-メチル-2-オキサゾリジノン、1,3-ジメチル-2-イミダゾリジノン及びN-メチルスクシンイミド、ニトロメタン、ニトロエタン、エチレンジアミン等の含窒素化合物;
亜リン酸トリメチル、亜リン酸トリエチル、亜リン酸トリフェニル、リン酸トリメチル、リン酸トリエチル、リン酸トリフェニル、メチルホスホン酸ジメチル、エチルホスホン酸ジエチル、ビニルホスホン酸ジメチル、ビニルホスホン酸ジエチル、ジエチルホスホノ酢酸エチル、ジメチルホスフィン酸メチル、ジエチルホスフィン酸エチル、トリメチルホスフィンオキシド、トリエチルホスフィンオキシド、リン酸ビス(2,2-ジフルオロエチル)2,2,2-トリフルオロエチル、リン酸ビス(2,2,3,3-テトラフルオロプロピル)2,2,2-トリフルオロエチル、リン酸ビス(2,2,2-トリフルオロエチル)メチル、リン酸ビス(2,2,2-トリフルオロエチル)エチル、リン酸ビス(2,2,2-トリフルオロエチル)2,2-ジフルオロエチルリン酸ビス(2,2,2-トリフルオロエチル)2,2,3,3-テトラフルオロプロピル、リン酸トリブチル、リン酸トリス(2,2,2-トリフルオロエチル)、リン酸トリス(1,1,1,3,3,3-ヘキサフルオロプロパン-2-イル)、リン酸トリオクチル、リン酸2-フェニルフェニルジメチル、リン酸2-フェニルフェニルジエチル、リン酸(2,2,2-トリフルオロエチル)(2,2,3,3-テトラフルオロプロピル)メチル、メチル2-(ジメトキシホスホリル)アセテート、メチル2-(ジメチルホスホリル)アセテート、メチル2-(ジエトキシホスホリル)アセテート、メチル2-(ジエチルホスホリル)アセテート、メチレンビスホスホン酸メチル、メチレンビスホスホン酸エチル、エチレンビスホスホン酸メチル、エチレンビスホスホン酸エチル、ブチレンビスホスホン酸メチル、ブチレンビスホスホン酸エチル、酢酸2-プロピニル2-(ジメトキシホスホリル)、酢酸2-プロピニル2-(ジメチルホスホリル)、酢酸2-プロピニル2-(ジエトキシホスホリル)、酢酸2-プロピニル2-(ジエチルホスホリル)、リン酸トリス(トリメチルシリル)、リン酸トリス(トリエチルシリル)、リン酸トリス(トリメトキシシリル)、亜リン酸トリス(トリメチルシリル)、亜リン酸トリス(トリエチルシリル)、亜リン酸トリス(トリメトキシシリル)、ポリリン酸トリメチルシリル等の含燐化合物;
ホウ酸トリス(トリメチルシリル)、ホウ酸トリス(トリメトキシシリル)等の含ホウ素化合物;
ジメトキシアルミノキシトリメトキシシラン、ジエトキシアルミノキシトリエトキシシラン、ジプロポキシアルミノキシトリエトキシシラン、ジブトキシアルミノキシトリメトキシシラン、ジブトキシアルミノキシトリエトキシシラン、チタンテトラキス(トリメチルシロキシド)、チタンテトラキス(トリエチルシロキシド)、テトラメチルシラン等のシラン化合物;
等が挙げられる。これらは1種を単独で用いても、2種以上を併用してもよい。これらの助剤を添加することにより、高温保存後の容量維持特性やサイクル特性を向上させることができる。
上記その他の助剤としては、なかでも、含燐化合物が好ましく、リン酸トリス(トリメチルシリル)、亜リン酸(トリストリメチルシリル)が好ましい。
で示される含フッ素ラクトンが挙げられる。
で示される含フッ素ラクトン等も挙げられる。
で示される5員環構造が、合成が容易である点、化学的安定性が良好な点から好ましく挙げられ、更には、AとBの組合せにより、下記式(F):
で示される含フッ素ラクトンと、下記式(G):
で示される含フッ素ラクトンがある。
Rf5COO-M+ (30)
(式中、Rf5は炭素数3~10のエーテル結合を含んでいてもよい含フッ素アルキル基;M+はLi+、Na+、K+又はNHR’3 +(R’は同じか又は異なり、いずれもH又は炭素数が1~3のアルキル基)である)
で表される含フッ素カルボン酸塩や、下記式(40):
Rf6SO3 -M+ (40)
(式中、Rf6は炭素数3~10のエーテル結合を含んでいてもよい含フッ素アルキル基;M+はLi+、Na+、K+又はNHR’3 +(R’は同じか又は異なり、いずれもH又は炭素数が1~3のアルキル基)である)
で表される含フッ素スルホン酸塩等が好ましい。
A-(D)-B (101)
[式中、Dは式(201):
-(D1)n-(FAE)m-(AE)p-(Y)q- (201)
(式中、D1は、式(10a):
で示される側鎖に含フッ素エーテル基を有するエーテル単位;
FAEは、式(10b):
で示される側鎖にフッ素化アルキル基を有するエーテル単位;
AEは、式(10c):
で示されるエーテル単位;
Yは、式(10d-1)~(10d-3):
nは0~200の整数;mは0~200の整数;pは0~10000の整数;qは1~100の整数;ただしn+mは0ではなく、D1、FAE、AE及びYの結合順序は特定されない);
A及びBは同じか又は異なり、水素原子、フッ素原子及び/又は架橋性官能基を含んでいてもよいアルキル基、フッ素原子及び/又は架橋性官能基を含んでいてもよいフェニル基、-COOH基、-OR(Rは水素原子又はフッ素原子及び/又は架橋性官能基を含んでいてもよいアルキル基)、エステル基又はカーボネート基(ただし、Dの末端が酸素原子の場合は-COOH基、-OR、エステル基及びカーボネート基ではない)]
で表される側鎖に含フッ素基を有する非晶性含フッ素ポリエーテル化合物である。
なお、添加剤として化合物(11)を使用する場合、上述した電解質塩としては、化合物(11)以外の化合物を使用することが好ましい。
上記S=O基を有するリチウム塩類としては、モノフルオロスルホン酸リチウム(FSO3Li)、メチル硫酸リチウム(CH3OSO3Li)、エチル硫酸リチウム(C2H5OSO3Li)、2,2,2-トリフルオロエチル硫酸リチウム等が挙げられる。
化合物(11)としては、中でも、LiPO2F2、FSO3Li、C2H5OSO3Liが好ましい。
HFの含有量は、10ppm以上がより好ましく、20ppm以上が更に好ましい。HFの含有量はまた、100ppm以下がより好ましく、80ppm以下が更に好ましく、50ppm以下が特に好ましい。
HFの含有量は、中和滴定法により測定することができる。
正極と負極と、本開示の電解液とを備えたアルカリ金属イオン二次電池も本開示の一つである。
さらに、上記アルカリ金属イオン二次電池を備えるモジュールも本開示の一つである。
正極は、正極活物質を含む正極活物質層と、集電体とから構成される。
式(3-1):MaMn2-bM1 bO4
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり;0.9≦a;0≦b≦1.5;M1はFe、Co、Ni、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、SiおよびGeよりなる群より選択される少なくとも1種の金属)で表されるリチウム・マンガンスピネル複合酸化物、
式(3-2):MNi1-cM2 cO2
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり;0≦c≦0.5;M2はFe、Co、Mn、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、SiおよびGeよりなる群より選択される少なくとも1種の金属)で表されるリチウム・ニッケル複合酸化物、または、
式(3-3):MCo1-dM3 dO2
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり;0≦d≦0.5;M3はFe、Ni、Mn、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、SiおよびGeよりなる群より選択される少なくとも1種の金属)
で表されるリチウム・コバルト複合酸化物が挙げられる。上記において、Mは、好ましくは、Li、Na及びKからなる群より選択される1種の金属であり、より好ましくはLiまたはNaであり、さらに好ましくはLiである。
MNihCoiMnjM5 kO2 (3-4)
(式中、Mは、M5はFe、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、Si及びGeからなる群より選択される少なくとも1種を示し、(h+i+j+k)=1.0、0≦h≦1.0、0≦i≦1.0、0≦j≦1.5、0≦k≦0.2である。)
MeM4 f(PO4)g
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり、M4はV、Ti、Cr、Mn、Fe、Co、Ni及びCuからなる群より選択される少なくとも1種を示し、0.5≦e≦3、1≦f≦2、1≦g≦3)で表される化合物が挙げられる。上記において、Mは、好ましくは、Li、Na及びKからなる群より選択される1種の金属であり、より好ましくはLiまたはNaであり、さらに好ましくはLiである。
上記リチウム含有遷移金属リン酸化合物としては、オリビン型構造を有するものが好ましい。
なお、本開示では、タップ密度は、正極活物質粉体5~10gを10mlのガラス製メスシリンダーに入れ、ストローク約20mmで200回タップした時の粉体充填密度(タップ密度)g/cm3として求める。
上記正極活物質の粒子は、二次粒子の平均粒子径が40μm以下で、かつ、平均一次粒子径が1μm以下の微粒子を、0.5~7.0体積%含むものであることが好ましい。平均一次粒子径が1μm以下の微粒子を含有させることにより、電解液との接触面積が大きくなり、電極と電解液との間でのアルカリ金属イオンの拡散をより速くすることができ、その結果、電池の出力性能を向上させることができる。
上記結着剤としては、電極製造時に使用する溶媒や電解液に対して安全な材料であれば、任意のものを使用することができ、例えば、ポリエチレン、ポリプロピレン、ポリエチレンテレフタレート、ポリメチルメタクリレート、芳香族ポリアミド、キトサン、アルギン酸、ポリアクリル酸、ポリイミド、セルロース、ニトロセルロース等の樹脂系高分子;SBR(スチレン・ブタジエンゴム)、イソプレンゴム、ブタジエンゴム、フッ素ゴム、NBR(アクリロニトリル・ブタジエンゴム)、エチレン・プロピレンゴム等のゴム状高分子;スチレン・ブタジエン・スチレンブロック共重合体又はその水素添加物;EPDM(エチレン・プロピレン・ジエン三元共重合体)、スチレン・エチレン・ブタジエン・スチレン共重合体、スチレン・イソプレン・スチレンブロック共重合体又はその水素添加物等の熱可塑性エラストマー状高分子;シンジオタクチック-1,2-ポリブタジエン、ポリ酢酸ビニル、エチレン・酢酸ビニル共重合体、プロピレン・α-オレフィン共重合体等の軟質樹脂状高分子;ポリフッ化ビニリデン、ポリテトラフルオロエチレン、フッ化ビニリデン共重合体、テトラフルオロエチレン・エチレン共重合体等のフッ素系高分子;アルカリ金属イオン(特にリチウムイオン)のイオン伝導性を有する高分子組成物等が挙げられる。これらは、1種を単独で用いても、2種以上を任意の組み合わせ及び比率で併用してもよい。
負極は、負極活物質を含む負極活物質層と、集電体とから構成される。
また、Si又はSnを第一の構成元素とし、それに加えて第2、第3の構成元素を含む複合材料が挙げられる。第2の構成元素は、例えば、コバルト、鉄、マグネシウム、チタン、バナジウム、クロム、マンガン、ニッケル、銅、亜鉛、ガリウム及びジルコニウムからなる群より選択される少なくとも1種である。第3の構成元素は、例えば、ホウ素、炭素、アルミニウム及びリンからなる群より選択される少なくとも1種である。
特に、高い電池容量及び優れた電池特性が得られることから、上記金属材料として、ケイ素又はスズの単体(微量の不純物を含んでよい)、SiOv(0<v≦2)、SnOw(0≦w≦2)、Si-Co-C複合材料、Si-Ni-C複合材料、Sn-Co-C複合材料、Sn-Ni-C複合材料が好ましい。
MpTiqM8rO4
[式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり;M8は、Na、K、Co、Al、Fe、Ti、Mg、Cr、Ga、Cu、ZnおよびNbからなる群より選ばれる少なくとも1種の元素を表す。]
で表される化合物であることが好ましい。
(i)1.2≦p≦1.4、1.5≦q≦1.7、r=0
(ii)0.9≦p≦1.1、1.9≦q≦2.1、r=0
(iii)0.7≦p≦0.9、2.1≦q≦2.3、r=0
である化合物が、電池性能のバランスが良好なため特に好ましい。
水系溶媒としては、水、アルコール等が挙げられ、有機系溶媒としてはN-メチルピロリドン(NMP)、ジメチルホルムアミド、ジメチルアセトアミド、メチルエチルケトン、シクロヘキサノン、酢酸メチル、アクリル酸メチル、ジエチルトリアミン、N,N-ジメチルアミノプロピルアミン、テトラヒドロフラン(THF)、トルエン、アセトン、ジエチルエーテル、ジメチルアセトアミド、ヘキサメチルホスファルアミド、ジメチルスルホキシド、ベンゼン、キシレン、キノリン、ピリジン、メチルナフタレン、ヘキサン等が挙げられる。
本開示のアルカリ金属イオン二次電池は、更に、セパレータを備えることが好ましい。
上記セパレータの材質や形状は、電解液に安定であり、かつ、保液性に優れていれば特に限定されず、公知のものを使用することができる。なかでも、本開示の電解液に対し安定な材料で形成された、樹脂、ガラス繊維、無機物等が用いられ、保液性に優れた多孔性シート又は不織布状の形態の物等を用いるのが好ましい。
電極群は、上記の正極板と負極板とを上記のセパレータを介してなる積層構造のもの、及び上記の正極板と負極板とを上記のセパレータを介して渦巻き状に捲回した構造のもののいずれでもよい。電極群の体積が電池内容積に占める割合(以下、電極群占有率と称する)は、通常40%以上であり、50%以上が好ましく、また、通常90%以下であり、80%以下が好ましい。
以下の実施例においては特に言及しない場合は、「部」「%」はそれぞれ「重量部」「重量%」を表す。
正極活物質としてのLi(Ni1/3Mn1/3Co1/3)O290質量%と、導電材としてのアセチレンブラック5質量%と、結着剤としてのポリフッ化ビニリデン(PVdF)5質量%とを、N-メチルピロリドン溶媒中で混合して、スラリー化した。得られたスラリーを、予め導電助剤を塗布した厚さ15μmのアルミ箔の片面に塗布して、乾燥し、プレス機にてロールプレスしたものを直径13φの形状に切り出して正極とした。
正極活物質をLiNi0.8Co0.15Al0.05O2に変更した以外は正極1と同様にして正極を作製した。
正極活物質をLiNi0.5Mn1.5O4に変更した以外は正極1と同様にして正極を作製した。
正極活物質をLi1.2Mn0.5Co0.14Ni0.14O2に変更した以外は正極1と同様にして正極を作製した。
正極活物質としてのLiFePO483.5質量%と、導電材としてのアセチレンブラック10質量%と、結着剤としてのポリフッ化ビニリデン(PVdF)6.5質量%とを、N-メチルピロリドン溶媒中で混合して、スラリー化した。得られたスラリーを、予め導電助剤を塗布した厚さ15μmのアルミ箔の片面に塗布して、乾燥し、プレス機にてロールプレスしたものを直径13φの形状に切り出して正極とした。
炭素質材料(グラファイト)98質量部に、増粘剤及びバインダーとして、カルボキシメチルセルロースナトリウムの水性ディスパージョン(カルボキシメチルセルロースナトリウムの濃度1質量%)1質量部及びスチレン-ブタジエンゴムの水性ディスパージョン(スチレン-ブタジエンゴムの濃度50質量%)1質量部を加え、ディスパーザーで混合してスラリー化した。得られたスラリーを厚さ10μmの銅箔に塗布して乾燥し、プレス機で圧延したものを直径15φの形状に切り出して負極とした。
ケイ素(単体)80質量部に、導電材としてのアセチレンブラック15質量%と、結着剤としてのPVdF5質量%とを、N-メチルピロリドン溶媒中で混合して、スラリー化した。得られたスラリーを厚さ10μmの銅箔に塗布して乾燥し、プレス機で圧延したものを直径15φの形状に切り出して負極とした。
チタン酸リチウム(Li4/3Ti5/3O4)80質量部に、導電材としてのアセチレンブラック15質量%と、結着剤としてのPVdF 5質量%とを、N-メチルピロリドン溶媒中で混合して、スラリー化した。得られたスラリーを厚さ10μmの銅箔に塗布して乾燥し、プレス機で圧延したものを直径15φの形状に切り出して負極とした。
スズ・コバルト合金粉末75質量部と、導電剤兼負極活物質として黒鉛20質量部と、結着剤としてスチレン-ブタジエンゴム2.5質量部と、増粘剤としてカルボキシメチルセルロース2.5質量部とを混合したのち、純水に分散させてスラリー化した。得られたスラリーを厚さ10μmの銅箔に塗布して乾燥し、プレス機で圧延したものを直径15φの形状に切り出して負極とした。
炭素質材料(グラファイト)93質量部とケイ素5質量部に、増粘剤及びバインダーとして、カルボキシメチルセルロースナトリウムの水性ディスパージョン(カルボキシメチルセルロースナトリウムの濃度1質量%)1質量部及びスチレン-ブタジエンゴムの水性ディスパージョン(スチレン-ブタジエンゴムの濃度50質量%)1質量部を加え、ディスパーザーで混合してスラリー化した。厚さ10μmの銅箔に塗布して乾燥し、プレス機で圧延したものを直径15φの形状に切り出して負極とした。
(電解液の調製)
フルオロエチレンカーボネート(FEC)とジメチルカーボネート(DMC)と含フッ素エーテル(I)を20/40/40(体積%)で混合し、さらにLiPF6を1.0モル/リットルの濃度となるように添加して非水電解液を調製した。
上記の正極1を直径25φの微孔性ポリエチレンフィルム(セパレータ)を介して正極1と負極1を対向させ、上記で得られた非水電解液を注入し、上記非水電解液がセパレータ等に充分に浸透した後、密閉し、二極式セルを作製した。
[レート特性試験]
上記で製造した二極式セルを、25℃において、0.1Cに相当する定電流で4.5Vまで充電した後、0.1Cの定電流で3.0Vまで放電した。再度、0.1Cの定電流で4.5Vまで充電後、4.5Vの定電圧で電流値が0.05Cになるまで充電を実施し、0.1Cの定電流で3.0Vまで放電し、初期放電容量を求めた。その後、0.1Cの定電流で4.5Vまで充電後、4.5Vの定電圧で電流値が0.05Cになるまで充電を実施し、5Cの定電流で3.0Vまで放電し、5C放電容量を測定し、下記式に基づき、容量維持率(%)を求めた。
(5C放電容量)/(初期放電容量)×100=容量維持率(%)
ここで、1Cとは電池の基準容量を1時間で放電する電流値を表し、5Cとはその5倍の電流値を、0.1Cとはその1/10の電流値を表す。
実施例1の含フッ素エーテルを(I)から(II)に変更した以外は、実施例1と同様に電池特性の評価をおこなった。
FECとDMCを30/70(体積%)で混合し、さらにLiPF6を1.0モル/リットルの濃度となるように添加して非水電解液を調製した以外は、実施例1と同様に電池特性の評価をおこなった。
実施例1の含フッ素エーテルを(I)から(III)に変更した以外は、実施例1と同様に電池特性の評価をおこなった。
実施例1の含フッ素エーテルを(I)から(IV)に変更した以外は、実施例1と同様に電池特性の評価をおこなった。
結果を表1に示す。
(電解液の調製)
FECとDMCと含フッ素エーテル(I)を20/40/40(体積%)で混合し、さらにLiPF6を1.0モル/リットルの濃度となるように添加して非水電解液を調製した。
上記の正極1を直径25φの微孔性ポリエチレンフィルム(セパレータ)を介して正極1と負極2を対向させ、上記で得られた非水電解液を注入し、上記非水電解液がセパレータ等に充分に浸透した後、密閉し、二極式セルを作製した。
[レート特性試験]
上記で製造した二極式セルを、25℃において、0.1Cに相当する定電流で4.3Vまで充電した後、0.1Cの定電流で3.0Vまで放電した。再度、0.1Cの定電流で4.3Vまで充電後、4.3Vの定電圧で電流値が0.05Cになるまで充電を実施し、0.1Cの定電流で3.0Vまで放電し、初期放電容量を求めた。その後、0.1Cの定電流で4.3Vまで充電後、4.3Vの定電圧で電流値が0.05Cになるまで充電を実施し、3Cの定電流で3.0Vまで放電し、3C放電容量を測定し、下記式に基づき、容量維持率(%)を求めた。
(3C放電容量)/(初期放電容量)×100=容量維持率(%)
ここで、1Cとは電池の基準容量を1時間で放電する電流値を表し、3Cとはその3倍の電流値を、0.1Cとはその1/10の電流値を表す。
実施例3の含フッ素エーテルを(I)から(II)に変更した以外は、実施例3と同様に電池特性の評価をおこなった。
実施例3の負極2を負極4に変更した以外は実施例3と同様に電池特性の評価をおこなった。
実施例5の含フッ素エーテルを(I)から(II)に変更した以外は、実施例5と同様に電池特性の評価をおこなった。
FECとDMCを30/70(体積%)で混合し、さらにLiPF6を1.0モル/リットルの濃度となるように添加して非水電解液を調製した以外は、実施例3と同様に電池特性の評価をおこなった。
実施例3の含フッ素エーテルを(I)から(III)に変更した以外は、実施例3と同様に電池特性の評価をおこなった。
実施例3の含フッ素エーテルを(I)から(IV)に変更した以外は、実施例3と同様に電池特性の評価をおこなった。
結果を表2に示す。
(電解液の調製)
プロピレンカーボネート(PC)とジエチルカーボネート(DEC)と含フッ素エーテル(I)を30/65/5(体積%)で混合し、さらにLiPF6を1.0モル/リットルの濃度となるように添加して非水電解液を調製した。
上記の正極1を直径25φの微孔性ポリエチレンフィルム(セパレータ)を介して正極1と負極3を対向させ、上記で得られた非水電解液を注入し、上記非水電解液がセパレータ等に充分に浸透した後、密閉し、二極式セルを作製した。
[レート特性試験]
上記で製造した二極式セルを、25℃において、0.1Cに相当する定電流で2.8Vまで充電した後、0.1Cの定電流で1.2Vまで放電した。再度、0.1Cの定電流で2.8Vまで充電後、2.8Vの定電圧で電流値が0.05Cになるまで充電を実施し、0.1Cの定電流で1.2Vまで放電し、初期放電容量を求めた。その後、0.1Cの定電流で2.8Vまで充電後、2.8Vの定電圧で電流値が0.05Cになるまで充電を実施し、3Cの定電流で1.2Vまで放電し、3C放電容量を測定し、下記式に基づき、容量維持率(%)を求めた。
(3C放電容量)/(初期放電容量)×100=容量維持率(%)
実施例7の含フッ素エーテルを(I)から(II)に変更した以外は、実施例7と同様に電池特性の評価をおこなった。
PCとDECを30/70(体積%)で混合し、さらにLiPF6を1.0モル/リットルの濃度となるように添加して非水電解液を調製した以外は、実施例7と同様に電池特性の評価をおこなった。
実施例7の含フッ素エーテルを(I)から(III)に変更した以外は実施例7と同様に電池特性の評価をおこなった。
実施例7の含フッ素エーテルを(I)から(IV)に変更した以外は実施例7と同様に電池特性の評価をおこなった。
結果を表3に示す。
(電解液の調製)
エチレンカーボネート(EC)とFECとDMCと含フッ素エーテル(I)を25/5/65/5(体積%)で混合し、さらにLiPF6を1.2モル/リットルの濃度となるように添加して非水電解液を調製した。
上記の正極2を直径25φの微孔性ポリエチレンフィルム(セパレータ)を介して正極2と負極5を対向させ、上記で得られた非水電解液を注入し、上記非水電解液がセパレータ等に充分に浸透した後、密閉し、二極式セルを作製した。
[レート特性試験]
上記で製造した二極式セルを、25℃において、0.1Cに相当する定電流で4.2Vまで充電した後、0.1Cの定電流で3.0Vまで放電した。再度、0.1Cの定電流で4.2Vまで充電後、4.2Vの定電圧で電流値が0.05Cになるまで充電を実施し、0.1Cの定電流で3.0Vまで放電し、初期放電容量を求めた。その後、0.1Cの定電流で4.2Vまで充電後、4.2Vの定電圧で電流値が0.05Cになるまで充電を実施し、5Cの定電流で3.0Vまで放電し、5C放電容量を測定し、下記式に基づき、容量維持率(%)を求めた。
(5C放電容量)/(初期放電容量)×100=容量維持率(%)
ECとFECとDMCと含フッ素エーテル(I)を25/5/60/10(体積%)で混合し、さらにLiPF6を1.2モル/リットルの濃度となるように添加して非水電解液を調製した以外は、実施例9と同様に電池特性の評価をおこなった。
ECとFECとDMCと含フッ素エーテル(I)を25/5/50/20(体積%)で混合し、さらにLiPF6を1.2モル/リットルの濃度となるように添加して非水電解液を調製した以外は、実施例9と同様に電池特性の評価をおこなった。
ECとFECとDMCと含フッ素エーテル(I)を25/5/40/30(体積%)で混合し、さらにLiPF6を1.2モル/リットルの濃度となるように添加して非水電解液を調製した以外は、実施例9と同様に電池特性の評価をおこなった。
実施例10の含フッ素エーテルを(I)から(II)に変更した以外は、実施例10と同様に電池特性の評価をおこなった。
ECとFECとDMCを25/5/70(体積%)で混合し、さらにLiPF6を1.2モル/リットルの濃度となるように添加して非水電解液を調製した以外は、実施例9と同様に電池特性の評価をおこなった。
実施例11の含フッ素エーテルを(I)から(III)に変更した以外は実施例11と同様に電池特性の評価をおこなった。
実施例11の含フッ素エーテルを(I)から(IV)に変更した以外は実施例11と同様に電池特性の評価をおこなった。
結果を表4に示す。
(電解液の調製)
FECと含フッ素鎖状カーボネート(I)と含フッ素エーテル(I)を30/50/20(体積%)で混合し、さらにLiPF6を1.2モル/リットルの濃度となるように添加して非水電解液を調製した。
上記の正極3を直径25φの微孔性ポリエチレンフィルム(セパレータ)を介して正極3と負極5を対向させ、上記で得られた非水電解液を注入し、上記非水電解液がセパレータ等に充分に浸透した後、密閉し、二極式セルを作製した。
[レート特性試験]
上記で製造した二極式セルを、25℃において、0.1Cに相当する定電流で4.6Vまで充電した後、0.1Cの定電流で3.0Vまで放電した。再度、0.1Cの定電流で4.6Vまで充電後、4.6Vの定電圧で電流値が0.05Cになるまで充電を実施し、0.1Cの定電流で3.0Vまで放電し、初期放電容量を求めた。その後、0.1Cの定電流で4.6Vまで充電後、4.2Vの定電圧で電流値が0.05Cになるまで充電を実施し、5Cの定電流で3.0Vまで放電し、5C放電容量を測定し、下記式に基づき、容量維持率(%)を求めた。
(5C放電容量)/(初期放電容量)×100=容量維持率(%)
実施例14の含フッ素エーテルを(I)から(II)に変更した以外は、実施例14と同様に電池特性の評価をおこなった。
FECと含フッ素鎖状カーボネート(I)を30/70(体積%)で混合し、さらにLiPF6を1.2モル/リットルの濃度となるように添加して非水電解液を調製した以外は、実施例14と同様に電池特性の評価をおこなった。
実施例14の含フッ素エーテルを(I)から(III)に変更した以外は、実施例14と同様に電池特性の評価をおこなった。
実施例14の含フッ素エーテルを(I)から(IV)に変更した以外は、実施例14と同様に電池特性の評価をおこなった。
実施例14の含フッ素エーテルを(I)から(V)に変更した以外は、実施例14と同様に電池特性の評価をおこなった。
結果を表5に示す。
(電解液の調製)
PCと含フッ素鎖状カーボネート(I)と含フッ素エーテル(I)を30/40/30(体積%)で混合し、さらにLiPF6を1.2モル/リットルの濃度となるように添加して非水電解液を調製した。
上記の正極4を直径25φの微孔性ポリエチレンフィルム(セパレータ)を介して正極4と負極3を対向させ、上記で得られた非水電解液を注入し、上記非水電解液がセパレータ等に充分に浸透した後、密閉し、二極式セルを作製した。
[レート特性試験]
上記で製造した二極式セルを、25℃において、0.1Cに相当する定電流で4.55まで充電した後、0.1Cの定電流で2.0Vまで放電した。再度、0.1Cの定電流で4.55Vまで充電後、4.55Vの定電圧で電流値が0.05Cになるまで充電を実施し、0.1Cの定電流で2.0Vまで放電し、初期放電容量を求めた。その後、0.1Cの定電流で4.55Vまで充電後、4.55Vの定電圧で電流値が0.05Cになるまで充電を実施し、5Cの定電流で2.0Vまで放電し、5C放電容量を測定し、下記式に基づき、容量維持率(%)を求めた。
(5C放電容量)/(初期放電容量)×100=容量維持率(%)
実施例16の含フッ素エーテルを(I)から(II)に変更した以外は、実施例16と同様に電池特
PCと含フッ素鎖状カーボネート(I)を30/70(体積%)で混合し、さらにLiPF6を1.2モル/リットルの濃度となるように添加して非水電解液を調製した以外は実施例16と同様に電池特性の評価をおこなった。
実施例16の含フッ素エーテルを(I)から(III)に変更した以外は実施例16と同様に電池特性の評価をおこなった。
実施例16の含フッ素エーテルを(I)から(IV)に変更した以外は実施例16と同様に電池特性の評価をおこなった。
実施例16の含フッ素エーテルを(I)から(V)に変更した以外は実施例16と同様に電池特性の評価をおこなった。
結果を表6に示す。
ECとエチルメチルカーボネート(EMC)と含フッ素エーテル(I)を30/65/5(体積%)で混合し、さらにLiPF6を1.0モル/リットルの濃度となるように添加して非水電解液を調製した。
上記の正極5を直径25φの微孔性ポリエチレンフィルム(セパレータ)を介して正極5と負極1を対向させ、上記で得られた非水電解液を注入し、上記非水電解液がセパレータ等に充分に浸透した後、密閉し、二極式セルを作製した。
[レート特性試験]
上記で製造した二極式セルを、25℃において、0.1Cに相当する定電流で3.8Vまで充電した後、0.1Cの定電流で2.0Vまで放電した。再度、0.1Cの定電流で3.8Vまで充電後、3.8Vの定電圧で電流値が0.05Cになるまで充電を実施し、0.1Cの定電流で2.0Vまで放電し、初期放電容量を求めた。その後、0.1Cの定電流で3.8Vまで充電後、3.8Vの定電圧で電流値が0.05Cになるまで充電を実施し、3Cの定電流で2.0Vまで放電し、3C放電容量を測定し、下記式に基づき、容量維持率(%)を求めた。
(3C放電容量)/(初期放電容量)×100=容量維持率(%)
実施例18の含フッ素エーテルを(I)から(II)に変更した以外は、実施例18と同様に電池特性の評価をおこなった。
ECとEMCを30/70(体積%)で混合し、さらにLiPF6を1.0モル/リットルの濃度となるように添加して非水電解液を調製した以外は、実施例18と同様に電池特性の評価をおこなった。
実施例18の含フッ素エーテルを(I)から(III)に変更した以外は、実施例18と同様に電池特性の評価をおこなった。
実施例18の含フッ素エーテルを(I)から(IV)に変更した以外は、実施例18と同様に電池特性の評価をおこなった。
結果を表8に示す。
Claims (8)
- アルカリ金属含有遷移金属複合酸化物は、下記式(3-1)で表される化合物及び下記式(3-4)で表される化合物からなる群より選択される少なくとも1種である請求項1記載のアルカリ金属イオン二次電池用電解液。
MaMn2-bM1 bO4 (3-1)
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり;0.9≦a;0≦b≦1.5;M1はFe、Co、Ni、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、SiおよびGeよりなる群より選択される少なくとも1種の金属)
MNihCoiMnjM5 kO2 (3-4)
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり、M5はFe、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、Si及びGeからなる群より選択される少なくとも1種を示し、(h+i+j+k)=1.0、0≦h≦1.0、0≦i≦1.0、0≦j≦1.5、0≦k≦0.2である。) - アルカリ金属含有遷移金属リン酸化合物は、下記式(4)で表される化合物である請求項1記載のアルカリ金属イオン二次電池用電解液。
MeM4 f(PO4)g (4)
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり、M4はV、Ti、Cr、Mn、Fe、Co、Ni及びCuからなる群より選択される少なくとも1種を示し、0.5≦e≦3、1≦f≦2、1≦g≦3) - アルカリ金属含有遷移金属複合酸化物は、下記式(3-1)で表される化合物及び下記式(3-4)で表される化合物からなる群より選択される少なくとも1種である請求項4記載のアルカリ金属イオン二次電池。
MaMn2-bM1 bO4 (3-1)
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり;0.9≦a;0≦b≦1.5;M1はFe、Co、Ni、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、SiおよびGeよりなる群より選択される少なくとも1種の金属)
MNihCoiMnjM5 kO2 (3-4)
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり、M5はFe、Cu、Zn、Al、Sn、Cr、V、Ti、Mg、Ca、Sr、B、Ga、In、Si及びGeからなる群より選択される少なくとも1種を示し、(h+i+j+k)=1.0、0≦h≦1.0、0≦i≦1.0、0≦j≦1.5、0≦k≦0.2である。) - アルカリ金属含有遷移金属リン酸化合物は、下記式(4)で表される化合物である請求項4記載のアルカリ金属イオン二次電池。
MeM4 f(PO4)g (4)
(式中、Mは、Li、Na及びKからなる群より選択される少なくとも1種の金属であり、M4はV、Ti、Cr、Mn、Fe、Co、Ni及びCuからなる群より選択される少なくとも1種を示し、0.5≦e≦3、1≦f≦2、1≦g≦3) - 負極は、ケイ素系材料を含む請求項4、5又は6記載のアルカリ金属イオン二次電池。
- 請求項4、5、6又は7記載のアルカリ金属イオン二次電池を備えることを特徴とするモジュール。
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WO2022215515A1 (ja) * | 2021-04-06 | 2022-10-13 | Agc株式会社 | 電極用コーティング液、電極、及び電気化学デバイス |
WO2022215516A1 (ja) * | 2021-04-06 | 2022-10-13 | Agc株式会社 | 電極用コーティング液、電極、及び電気化学デバイス |
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