JP6776682B2 - リチウムイオン二次電池 - Google Patents
リチウムイオン二次電池 Download PDFInfo
- Publication number
- JP6776682B2 JP6776682B2 JP2016142429A JP2016142429A JP6776682B2 JP 6776682 B2 JP6776682 B2 JP 6776682B2 JP 2016142429 A JP2016142429 A JP 2016142429A JP 2016142429 A JP2016142429 A JP 2016142429A JP 6776682 B2 JP6776682 B2 JP 6776682B2
- Authority
- JP
- Japan
- Prior art keywords
- carbonate
- electrolytic solution
- ion secondary
- lithium ion
- secondary battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims description 114
- 229910001416 lithium ion Inorganic materials 0.000 title claims description 114
- 239000008151 electrolyte solution Substances 0.000 claims description 109
- 239000007773 negative electrode material Substances 0.000 claims description 65
- 150000005676 cyclic carbonates Chemical class 0.000 claims description 38
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 34
- 229910052731 fluorine Inorganic materials 0.000 claims description 34
- 239000011737 fluorine Substances 0.000 claims description 34
- 150000005678 chain carbonates Chemical class 0.000 claims description 32
- 229910052710 silicon Inorganic materials 0.000 claims description 23
- 239000003960 organic solvent Substances 0.000 claims description 20
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 15
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 15
- 239000010703 silicon Substances 0.000 claims description 15
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 8
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 55
- 229910052782 aluminium Inorganic materials 0.000 description 27
- 229920000642 polymer Polymers 0.000 description 27
- 239000002253 acid Substances 0.000 description 25
- 239000007774 positive electrode material Substances 0.000 description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 23
- 239000011230 binding agent Substances 0.000 description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 22
- -1 LiClO 4 Chemical class 0.000 description 21
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 21
- 239000011888 foil Substances 0.000 description 21
- 150000001875 compounds Chemical class 0.000 description 20
- 238000011156 evaluation Methods 0.000 description 18
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 17
- 239000012752 auxiliary agent Substances 0.000 description 17
- 239000010410 layer Substances 0.000 description 17
- 239000000203 mixture Substances 0.000 description 17
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 14
- 239000003792 electrolyte Substances 0.000 description 14
- 239000002002 slurry Substances 0.000 description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 13
- 239000000919 ceramic Substances 0.000 description 13
- 230000014759 maintenance of location Effects 0.000 description 13
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- 229910013870 LiPF 6 Inorganic materials 0.000 description 11
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 10
- 229910052744 lithium Inorganic materials 0.000 description 10
- 239000000047 product Substances 0.000 description 10
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- 238000000034 method Methods 0.000 description 9
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- 239000011149 active material Substances 0.000 description 7
- 238000000354 decomposition reaction Methods 0.000 description 7
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- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000002800 charge carrier Substances 0.000 description 6
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- 150000004676 glycans Chemical class 0.000 description 5
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- 239000011701 zinc Substances 0.000 description 5
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 4
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- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 4
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- 125000000217 alkyl group Chemical group 0.000 description 4
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- 229920001577 copolymer Polymers 0.000 description 4
- 229910052733 gallium Inorganic materials 0.000 description 4
- GAEKPEKOJKCEMS-UHFFFAOYSA-N gamma-valerolactone Chemical compound CC1CCC(=O)O1 GAEKPEKOJKCEMS-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 description 4
- HHVIBTZHLRERCL-UHFFFAOYSA-N sulfonyldimethane Chemical compound CS(C)(=O)=O HHVIBTZHLRERCL-UHFFFAOYSA-N 0.000 description 4
- 229910052718 tin Inorganic materials 0.000 description 4
- 239000011135 tin Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
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- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
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- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 3
- 229910013275 LiMPO Inorganic materials 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
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- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
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- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
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- 229910008590 Li2O—B2O3—P2O5 Inorganic materials 0.000 description 1
- 229910008627 Li2O—B2O3—ZnO Inorganic materials 0.000 description 1
- 229910013684 LiClO 4 Inorganic materials 0.000 description 1
- 229910011281 LiCoPO 4 Inorganic materials 0.000 description 1
- 229910010849 LiI—Li3N—LiOH Inorganic materials 0.000 description 1
- 229910002099 LiNi0.5Mn1.5O4 Inorganic materials 0.000 description 1
- 229910012465 LiTi Inorganic materials 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
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- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
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- ZCQWOFVYLHDMMC-UHFFFAOYSA-N Oxazole Chemical compound C1=COC=N1 ZCQWOFVYLHDMMC-UHFFFAOYSA-N 0.000 description 1
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- 239000004952 Polyamide Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
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- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 1
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- GTDPSWPPOUPBNX-UHFFFAOYSA-N ac1mqpva Chemical compound CC12C(=O)OC(=O)C1(C)C1(C)C2(C)C(=O)OC1=O GTDPSWPPOUPBNX-UHFFFAOYSA-N 0.000 description 1
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- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000008272 agar Substances 0.000 description 1
- 125000005370 alkoxysilyl group Chemical group 0.000 description 1
- 125000005263 alkylenediamine group Chemical group 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- UIERETOOQGIECD-ARJAWSKDSA-N angelic acid Chemical compound C\C=C(\C)C(O)=O UIERETOOQGIECD-ARJAWSKDSA-N 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 description 1
- 150000004056 anthraquinones Chemical class 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 150000004984 aromatic diamines Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 229910052789 astatine Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- HFACYLZERDEVSX-UHFFFAOYSA-N benzidine Chemical compound C1=CC(N)=CC=C1C1=CC=C(N)C=C1 HFACYLZERDEVSX-UHFFFAOYSA-N 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- WLLOZRDOFANZMZ-UHFFFAOYSA-N bis(2,2,2-trifluoroethyl) carbonate Chemical compound FC(F)(F)COC(=O)OCC(F)(F)F WLLOZRDOFANZMZ-UHFFFAOYSA-N 0.000 description 1
- GUQJDWWGHRDAQN-UHFFFAOYSA-N bis(difluoromethyl) carbonate Chemical compound FC(F)OC(=O)OC(F)F GUQJDWWGHRDAQN-UHFFFAOYSA-N 0.000 description 1
- IQFAIEKYIVKGST-UHFFFAOYSA-N bis(fluoromethyl) carbonate Chemical compound FCOC(=O)OCF IQFAIEKYIVKGST-UHFFFAOYSA-N 0.000 description 1
- LVYPNDZTRXRBNM-UHFFFAOYSA-N bis(trifluoromethyl) carbonate Chemical compound FC(F)(F)OC(=O)OC(F)(F)F LVYPNDZTRXRBNM-UHFFFAOYSA-N 0.000 description 1
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- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
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- 239000006227 byproduct Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
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- XKQTZYDZYSXGBD-UHFFFAOYSA-N chloro(isocyanato)methane Chemical compound ClCN=C=O XKQTZYDZYSXGBD-UHFFFAOYSA-N 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
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- 239000012528 membrane Substances 0.000 description 1
- HNEGQIOMVPPMNR-NSCUHMNNSA-N mesaconic acid Chemical compound OC(=O)C(/C)=C/C(O)=O HNEGQIOMVPPMNR-NSCUHMNNSA-N 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
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- 150000002739 metals Chemical class 0.000 description 1
- GZJQAHYLPINVDV-UHFFFAOYSA-N methyl 1,1,2,2,2-pentafluoroethyl carbonate Chemical compound COC(=O)OC(F)(F)C(F)(F)F GZJQAHYLPINVDV-UHFFFAOYSA-N 0.000 description 1
- HAMGRBXTJNITHG-UHFFFAOYSA-N methyl isocyanate Chemical compound CN=C=O HAMGRBXTJNITHG-UHFFFAOYSA-N 0.000 description 1
- MBABOKRGFJTBAE-UHFFFAOYSA-N methyl methanesulfonate Chemical compound COS(C)(=O)=O MBABOKRGFJTBAE-UHFFFAOYSA-N 0.000 description 1
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- HNEGQIOMVPPMNR-UHFFFAOYSA-N methylfumaric acid Natural products OC(=O)C(C)=CC(O)=O HNEGQIOMVPPMNR-UHFFFAOYSA-N 0.000 description 1
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- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 description 1
- KYTZHLUVELPASH-UHFFFAOYSA-N naphthalene-1,2-dicarboxylic acid Chemical compound C1=CC=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 KYTZHLUVELPASH-UHFFFAOYSA-N 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
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- MHYFEEDKONKGEB-UHFFFAOYSA-N oxathiane 2,2-dioxide Chemical compound O=S1(=O)CCCCO1 MHYFEEDKONKGEB-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000001814 pectin Substances 0.000 description 1
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- 235000010987 pectin Nutrition 0.000 description 1
- 229960000292 pectin Drugs 0.000 description 1
- YIYBQIKDCADOSF-UHFFFAOYSA-N pent-2-enoic acid Chemical compound CCC=CC(O)=O YIYBQIKDCADOSF-UHFFFAOYSA-N 0.000 description 1
- KHUXNRRPPZOJPT-UHFFFAOYSA-N phenoxy radical Chemical group O=C1C=C[CH]C=C1 KHUXNRRPPZOJPT-UHFFFAOYSA-N 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
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- 229920002800 poly crotonic acid Polymers 0.000 description 1
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- 229920002647 polyamide Polymers 0.000 description 1
- 229920000767 polyaniline Polymers 0.000 description 1
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- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
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- 229920002557 polyglycidol polymer Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
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- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
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- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- WYVAMUWZEOHJOQ-UHFFFAOYSA-N propionic anhydride Chemical compound CCC(=O)OC(=O)CC WYVAMUWZEOHJOQ-UHFFFAOYSA-N 0.000 description 1
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- 229940090181 propyl acetate Drugs 0.000 description 1
- AOHJOMMDDJHIJH-UHFFFAOYSA-N propylenediamine Chemical compound CC(N)CN AOHJOMMDDJHIJH-UHFFFAOYSA-N 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- 125000001424 substituent group Chemical group 0.000 description 1
- 229940014800 succinic anhydride Drugs 0.000 description 1
- MBDNRNMVTZADMQ-UHFFFAOYSA-N sulfolene Chemical compound O=S1(=O)CC=CC1 MBDNRNMVTZADMQ-UHFFFAOYSA-N 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- YBDQLHBVNXARAU-ZCFIWIBFSA-N tetrahydro-2-methyl-2H-pyran Natural products C[C@@H]1CCCCO1 YBDQLHBVNXARAU-ZCFIWIBFSA-N 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- TXXHDPDFNKHHGW-ZPUQHVIOSA-N trans,trans-muconic acid Chemical compound OC(=O)\C=C\C=C\C(O)=O TXXHDPDFNKHHGW-ZPUQHVIOSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
- 229930195735 unsaturated hydrocarbon Chemical class 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
- 229910009161 xLi2S-(1-x)P2S5 Inorganic materials 0.000 description 1
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Description
Si含有負極活物質と、
(FSO2)2NLi、下記一般式(A)で表される鎖状カーボネート、及び、フッ素含有環状カーボネートを含み、かつ、前記(FSO2)2NLiに対する前記鎖状カーボネートのモル比が2〜6の範囲内である電解液と、
を具備することを特徴とする。
R1OCOOR2 一般式(A)
(R1、R2は、それぞれ独立に、鎖状アルキルであるCnHaFbClcBrdIe、又は、環状アルキルを化学構造に含むCmHfFgClhBriIjのいずれかから選択される。nは1以上の整数、mは3以上の整数、a、b、c、d、e、f、g、h、i、jはそれぞれ独立に0以上の整数であり、2n+1=a+b+c+d+e、2m−1=f+g+h+i+jを満たす。)
Si含有負極活物質と、
(FSO2)2NLi、下記一般式(A)で表される鎖状カーボネート、及び、フッ素含有環状カーボネートを含み、かつ、前記(FSO2)2NLiに対する前記鎖状カーボネートのモル比が2〜6の範囲内である電解液(以下、本発明の電解液ということがある。)と、
を具備することを特徴とする。
R1OCOOR2 一般式(A)
(R1、R2は、それぞれ独立に、鎖状アルキルであるCnHaFbClcBrdIe、又は、環状アルキルを化学構造に含むCmHfFgClhBriIjのいずれかから選択される。nは1以上の整数、mは3以上の整数、a、b、c、d、e、f、g、h、i、jはそれぞれ独立に0以上の整数であり、2n+1=a+b+c+d+e、2m−1=f+g+h+i+jを満たす。)
3CaSi2+6HCl → Si6H6+3CaCl2
Si6H6 → 6Si+3H2↑
(R3、R4は、それぞれ独立に、鎖状アルキルであるCnHaFb、又は、環状アルキルを化学構造に含むCmHfFgのいずれかから選択される。nは1以上の整数、mは3以上の整数、a、b、f、gはそれぞれ独立に0以上の整数であり、2n+1=a+b、2m−1=f+gを満たす。)
さらに、本発明の電解液は、(FSO2)2NLiを比較的高濃度で含むため、豊富にリチウムイオンを含有する。そうすると、本発明の電解液は、充放電時にリチウムイオンを電極へ直ちに供給可能であるといえる。
加えて、負極活物質の表面に形成されるフッ素含有環状カーボネートの分解物に由来する被膜には、フッ化リチウムや炭酸リチウムが存在することが想定される。すなわち、負極付近には多くのリチウムイオンが存在する状態にある。
後述する評価例1、評価例2、評価例4において、本発明のリチウムイオン二次電池が出力特性に優れること、及び、本発明のリチウムイオン二次電池の直流抵抗が低いことが実証された。これらの評価結果は、上述した本発明の電解液や上記被膜の特性が反映された結果であると考えられる。
正極及び負極に必要に応じてセパレータを挟装させ電極体とする。電極体は、正極、セパレータ及び負極を重ねた積層型、又は、正極、セパレータ及び負極を捲いた捲回型のいずれの型にしても良い。正極の集電体及び負極の集電体から外部に通ずる正極端子及び負極端子までの間を、集電用リード等を用いて接続した後に、電極体に本発明の電解液を加えてリチウムイオン二次電池とするとよい。また、本発明のリチウムイオン二次電池は、電極に含まれる活物質の種類に適した電圧範囲で充放電を実行されればよい。
鎖状カーボネートであるジメチルカーボネート及びエチルメチルカーボネートを9:1のモル比で混合した混合溶媒に、(FSO2)2NLiを加えて溶解させ、さらにフッ素含有環状カーボネートであるフルオロエチレンカーボネートを加えて、フルオロエチレンカーボネートを10質量%で含む実施例1の電解液を製造した。実施例1の電解液においては、(FSO2)2NLiに対する鎖状カーボネートのモル比は4である。
フルオロエチレンカーボネートを20質量%で含むようにフルオロエチレンカーボネートの添加量を増加した以外は、実施例1と同様の方法で、実施例2の電解液を製造した。実施例2の電解液においても、(FSO2)2NLiに対する鎖状カーボネートのモル比は4である。
以下、実施例2の電解液を用いた以外は、実施例1と同様の方法で、実施例2のリチウムイオン二次電池を製造した。
フルオロエチレンカーボネートを30質量%で含むようにフルオロエチレンカーボネートの添加量を増加した以外は、実施例1と同様の方法で、実施例3の電解液を製造した。実施例3の電解液においても、(FSO2)2NLiに対する鎖状カーボネートのモル比は4である。
以下、実施例3の電解液を用いた以外は、実施例1と同様の方法で、実施例3のリチウムイオン二次電池を製造した。
フルオロエチレンカーボネートを添加しなかったこと以外は、実施例1と同様の方法で、比較例1の電解液を製造した。比較例1の電解液においても、(FSO2)2NLiに対する鎖状カーボネートのモル比は4である。比較例1の電解液は、(FSO2)2NLiの濃度が2.8mol/Lである。
以下、比較例1の電解液を用いた以外は、実施例1と同様の方法で、比較例1のリチウムイオン二次電池を製造した。
フッ素含有環状カーボネートであるフルオロエチレンカーボネート、環状カーボネートであるエチレンカーボネート、鎖状カーボネートであるエチルメチルカーボネート及びジメチルカーボネートを、15:15:30:40の体積比で混合した混合溶媒に、LiPF6を加えて溶解させて、比較例2の電解液を製造した。比較例2の電解液においては、LiPF6の濃度が1mol/Lである。また、比較例2の電解液はフルオロエチレンカーボネートを19質量%で含む。
以下、比較例2の電解液を用いた以外は、実施例1と同様の方法で、比較例2のリチウムイオン二次電池を製造した。
電圧3.05Vに調整した実施例1〜実施例3、比較例1〜比較例2の各リチウムイオン二次電池につき、−20℃での条件下、電圧2.8Vまで一定出力にて放電させた場合の放電時間を測定した。当該測定は、出力を変えた複数の条件下で行った。得られた結果から、各リチウムイオン二次電池につき、3.05Vから2.8Vまでの放電時間が3分間となる一定出力(W)を算出し、比較例1を100として規格化した。結果を図1に示す。
電圧3.05Vに調整した実施例1〜実施例3、比較例1〜比較例2の各リチウムイオン二次電池につき、0℃での条件下、電圧2.8Vまで一定出力にて放電させた場合の放電時間を測定した。当該測定は、出力を変えた複数の条件下で行った。得られた結果から、各リチウムイオン二次電池につき、放電時間が10秒間となる一定出力(W)を算出し、比較例1を100として規格化した。結果を図2に示す。
実施例1〜実施例3、比較例1〜比較例2の各リチウムイオン二次電池につき、温度25℃、1Cレートの定電流にて、4.24Vまで充電し2.8Vまで放電を行う4.24V−2.8Vの充放電サイクルを繰り返し行った。所定サイクル後のリチウムイオン二次電池の容量維持率(%)を以下の式で求めた。200サイクル時及び500サイクル時の容量維持率(%)を表1に示す。
容量維持率(%)=(B/A)×100
A:最初の充放電サイクルにおける放電容量
B:所定サイクル時の放電容量
LiFSA:(FSO2)2NLi
FEC:フルオロエチレンカーボネート
鎖状カーボネートであるジメチルカーボネート及びエチルメチルカーボネートを9:1のモル比で混合した混合溶媒に、(FSO2)2NLiを加えて溶解させ、さらにフッ素含有環状カーボネートであるフルオロエチレンカーボネートを加えて、フルオロエチレンカーボネートを3質量%で含む実施例4の電解液を製造した。実施例4の電解液においては、(FSO2)2NLiに対する鎖状カーボネートのモル比が4である。
フルオロエチレンカーボネートを添加しなかったこと以外は、実施例4と同様の方法で、比較例3の電解液を製造した。比較例3の電解液においても、(FSO2)2NLiに対する鎖状カーボネートのモル比は4である。比較例3の電解液は、(FSO2)2NLiの濃度が2.4mol/Lである。
以下、比較例3の電解液を用いた以外は、実施例4と同様の方法で、比較例3のリチウムイオン二次電池を製造した。
フッ素含有環状カーボネートであるフルオロエチレンカーボネート、環状カーボネートであるエチレンカーボネート、鎖状カーボネートであるエチルメチルカーボネート及びジメチルカーボネートを、15:15:30:40の体積比で混合した混合溶媒に、LiPF6を加えて溶解させて、比較例4の電解液を製造した。比較例4の電解液においては、LiPF6の濃度が1mol/Lである。また、比較例4の電解液はフルオロエチレンカーボネートを19質量%で含む。
比較例4の電解液を用いた以外は、実施例4と同様の方法で、比較例4のリチウムイオン二次電池を製造した。
環状カーボネートであるエチレンカーボネート、鎖状カーボネートであるエチルメチルカーボネート及びジメチルカーボネートを、30:30:40の体積比で混合した混合溶媒に、LiPF6を加えて溶解させて、比較例5の電解液を製造した。比較例5の電解液においては、LiPF6の濃度が1mol/Lである。
比較例5の電解液を用いた以外は、実施例4と同様の方法で、比較例5のリチウムイオン二次電池を製造した。
電圧3.05Vに調整した実施例4、比較例3〜比較例5の各リチウムイオン二次電池につき、25℃、1Cレートの定電流にて、10秒間放電させた。放電前後の電圧変化量及び電流値から、オームの法則により、放電時の直流抵抗を算出した。結果を表2に示す。
実施例4、比較例3〜比較例5の各リチウムイオン二次電池につき、温度25℃の条件下、0.3Cレートの定電流にて、4.1Vまで充電した後に2.5Vまで放電して、放電容量を測定した。これらの放電容量を初期容量とした。
容量維持率(%)=(サイクル後容量/初期容量)×100
評価例5の試験後における、実施例4及び比較例3の両リチウムイオン二次電池における負極活物質を、以下のとおり分析した。
Claims (3)
- Si含有負極活物質と、
(FSO2)2NLi、
ジメチルカーボネート、ジエチルカーボネート及びエチルメチルカーボネートから選択される鎖状カーボネート、
及び、フッ素含有環状カーボネートを含み、かつ、前記(FSO2)2NLiに対する前記鎖状カーボネートのモル比が2〜6の範囲内である電解液と、
を具備し、
前記電解液は、前記電解液に含まれるフッ素含有環状カーボネート以外の全有機溶媒に対し、前記鎖状カーボネートを80体積%以上、80質量%以上又は80モル%以上で含み、
かつ、ジメチルカーボネート及びジエチルカーボネートをモル比80:20〜95:5の範囲内で含むか、又は、ジメチルカーボネート及びエチルメチルカーボネートをモル比80:20〜95:5の範囲内で含むことを特徴とするリチウムイオン二次電池。 - 電解液全体に対して前記フッ素含有環状カーボネートを0超〜40質量%で含む請求項1に記載のリチウムイオン二次電池。
- 前記Si含有負極活物質が、複数枚の板状シリコン体が厚さ方向に積層されてなる構造を有する請求項1または請求項2に記載のリチウムイオン二次電池。
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