CN116826170A - Nonaqueous electrolyte and lithium ion battery - Google Patents
Nonaqueous electrolyte and lithium ion battery Download PDFInfo
- Publication number
- CN116826170A CN116826170A CN202310767864.5A CN202310767864A CN116826170A CN 116826170 A CN116826170 A CN 116826170A CN 202310767864 A CN202310767864 A CN 202310767864A CN 116826170 A CN116826170 A CN 116826170A
- Authority
- CN
- China
- Prior art keywords
- structural formula
- compound
- battery
- electrolyte
- compound shown
- 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.)
- Pending
Links
- 239000011255 nonaqueous electrolyte Substances 0.000 title claims abstract description 53
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 38
- 150000001875 compounds Chemical class 0.000 claims abstract description 154
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 40
- 239000000654 additive Substances 0.000 claims abstract description 39
- 230000000996 additive effect Effects 0.000 claims abstract description 31
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 18
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 11
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical group [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 8
- 125000003342 alkenyl group Chemical group 0.000 claims abstract description 6
- XPBBUZJBQWWFFJ-UHFFFAOYSA-N fluorosilane Chemical group [SiH3]F XPBBUZJBQWWFFJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 125000004963 sulfonylalkyl group Chemical group 0.000 claims abstract description 4
- -1 aliphatic carboxylate Chemical class 0.000 claims description 82
- 239000007774 positive electrode material Substances 0.000 claims description 41
- 239000008151 electrolyte solution Substances 0.000 claims description 22
- 239000002904 solvent Substances 0.000 claims description 17
- 229910019142 PO4 Inorganic materials 0.000 claims description 14
- 239000010452 phosphate Substances 0.000 claims description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 13
- 229910052744 lithium Inorganic materials 0.000 claims description 13
- 150000003457 sulfones Chemical class 0.000 claims description 10
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 8
- 150000002170 ethers Chemical class 0.000 claims description 7
- 229910003002 lithium salt Inorganic materials 0.000 claims description 7
- 159000000002 lithium salts Chemical class 0.000 claims description 7
- 150000002825 nitriles Chemical class 0.000 claims description 7
- BTGRAWJCKBQKAO-UHFFFAOYSA-N adiponitrile Chemical compound N#CCCCCC#N BTGRAWJCKBQKAO-UHFFFAOYSA-N 0.000 claims description 6
- 150000005676 cyclic carbonates Chemical class 0.000 claims description 6
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 6
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 6
- 229930195735 unsaturated hydrocarbon Natural products 0.000 claims description 6
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 150000001733 carboxylic acid esters Chemical class 0.000 claims description 4
- ZTOMUSMDRMJOTH-UHFFFAOYSA-N glutaronitrile Chemical compound N#CCCCC#N ZTOMUSMDRMJOTH-UHFFFAOYSA-N 0.000 claims description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims description 3
- VTHRQKSLPFJQHN-UHFFFAOYSA-N 3-[2-(2-cyanoethoxy)ethoxy]propanenitrile Chemical compound N#CCCOCCOCCC#N VTHRQKSLPFJQHN-UHFFFAOYSA-N 0.000 claims description 3
- OQXNUCOGMMHHNA-UHFFFAOYSA-N 4-methyl-1,3,2-dioxathiolane 2,2-dioxide Chemical compound CC1COS(=O)(=O)O1 OQXNUCOGMMHHNA-UHFFFAOYSA-N 0.000 claims description 3
- 229910010238 LiAlCl 4 Inorganic materials 0.000 claims description 3
- 229910015015 LiAsF 6 Inorganic materials 0.000 claims description 3
- 229910013063 LiBF 4 Inorganic materials 0.000 claims description 3
- 229910013188 LiBOB Inorganic materials 0.000 claims description 3
- 229910013684 LiClO 4 Inorganic materials 0.000 claims description 3
- 229910010941 LiFSI Inorganic materials 0.000 claims description 3
- 229910013385 LiN(SO2C2F5)2 Inorganic materials 0.000 claims description 3
- 229910013870 LiPF 6 Inorganic materials 0.000 claims description 3
- 229910012258 LiPO Inorganic materials 0.000 claims description 3
- 229910012513 LiSbF 6 Inorganic materials 0.000 claims description 3
- XNENYPKLNXFICU-UHFFFAOYSA-N P(O)(O)O.C[SiH](C)C.C[SiH](C)C.C[SiH](C)C Chemical compound P(O)(O)O.C[SiH](C)C.C[SiH](C)C.C[SiH](C)C XNENYPKLNXFICU-UHFFFAOYSA-N 0.000 claims description 3
- BEKPOUATRPPTLV-UHFFFAOYSA-N [Li].BCl Chemical compound [Li].BCl BEKPOUATRPPTLV-UHFFFAOYSA-N 0.000 claims description 3
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 3
- VEWLDLAARDMXSB-UHFFFAOYSA-N ethenyl sulfate;hydron Chemical compound OS(=O)(=O)OC=C VEWLDLAARDMXSB-UHFFFAOYSA-N 0.000 claims description 3
- 150000008282 halocarbons Chemical group 0.000 claims description 3
- 125000005843 halogen group Chemical group 0.000 claims description 3
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 3
- 229910003473 lithium bis(trifluoromethanesulfonyl)imide Inorganic materials 0.000 claims description 3
- VDVLPSWVDYJFRW-UHFFFAOYSA-N lithium;bis(fluorosulfonyl)azanide Chemical compound [Li+].FS(=O)(=O)[N-]S(F)(=O)=O VDVLPSWVDYJFRW-UHFFFAOYSA-N 0.000 claims description 3
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 claims description 3
- 239000011356 non-aqueous organic solvent Substances 0.000 claims description 3
- BTNXBLUGMAMSSH-UHFFFAOYSA-N octanedinitrile Chemical compound N#CCCCCCCC#N BTNXBLUGMAMSSH-UHFFFAOYSA-N 0.000 claims description 3
- MHYFEEDKONKGEB-UHFFFAOYSA-N oxathiane 2,2-dioxide Chemical compound O=S1(=O)CCCCO1 MHYFEEDKONKGEB-UHFFFAOYSA-N 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 229930195734 saturated hydrocarbon Natural products 0.000 claims description 3
- IAHFWCOBPZCAEA-UHFFFAOYSA-N succinonitrile Chemical compound N#CCCC#N IAHFWCOBPZCAEA-UHFFFAOYSA-N 0.000 claims description 3
- NEILRVQRJBVMSK-UHFFFAOYSA-N B(O)(O)O.C[SiH](C)C.C[SiH](C)C.C[SiH](C)C Chemical compound B(O)(O)O.C[SiH](C)C.C[SiH](C)C.C[SiH](C)C NEILRVQRJBVMSK-UHFFFAOYSA-N 0.000 claims description 2
- LEGITHRSIRNTQV-UHFFFAOYSA-N carbonic acid;3,3,3-trifluoroprop-1-ene Chemical compound OC(O)=O.FC(F)(F)C=C LEGITHRSIRNTQV-UHFFFAOYSA-N 0.000 claims description 2
- SVTMLGIQJHGGFK-UHFFFAOYSA-N carbonic acid;propa-1,2-diene Chemical compound C=C=C.OC(O)=O SVTMLGIQJHGGFK-UHFFFAOYSA-N 0.000 claims description 2
- CKWYOYSKIHKIBW-UHFFFAOYSA-N ethenyl methyl sulfate Chemical compound COS(=O)(=O)OC=C CKWYOYSKIHKIBW-UHFFFAOYSA-N 0.000 claims description 2
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 description 90
- 239000007789 gas Substances 0.000 description 32
- 230000000052 comparative effect Effects 0.000 description 30
- 238000000354 decomposition reaction Methods 0.000 description 29
- 238000004519 manufacturing process Methods 0.000 description 29
- 150000005678 chain carbonates Chemical class 0.000 description 14
- 239000010410 layer Substances 0.000 description 13
- 238000003860 storage Methods 0.000 description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 230000009471 action Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 230000014759 maintenance of location Effects 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 229920001577 copolymer Polymers 0.000 description 8
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 7
- 239000007773 negative electrode material Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 6
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 239000006258 conductive agent Substances 0.000 description 6
- 239000011883 electrode binding agent Substances 0.000 description 6
- 150000002430 hydrocarbons Chemical group 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 229910052718 tin Inorganic materials 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 241001391944 Commicarpus scandens Species 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 5
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 150000004965 peroxy acids Chemical class 0.000 description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000011267 electrode slurry Substances 0.000 description 4
- 125000001153 fluoro group Chemical group F* 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 description 3
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910013716 LiNi Inorganic materials 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 3
- 238000007600 charging Methods 0.000 description 3
- 238000010277 constant-current charging Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 229910021389 graphene Inorganic materials 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 description 2
- OZJPLYNZGCXSJM-UHFFFAOYSA-N 5-valerolactone Chemical compound O=C1CCCCO1 OZJPLYNZGCXSJM-UHFFFAOYSA-N 0.000 description 2
- 102100028667 C-type lectin domain family 4 member A Human genes 0.000 description 2
- 101000766908 Homo sapiens C-type lectin domain family 4 member A Proteins 0.000 description 2
- 229910000733 Li alloy Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 2
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- NKDDWNXOKDWJAK-UHFFFAOYSA-N dimethoxymethane Chemical compound COCOC NKDDWNXOKDWJAK-UHFFFAOYSA-N 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 2
- VUPKGFBOKBGHFZ-UHFFFAOYSA-N dipropyl carbonate Chemical compound CCCOC(=O)OCCC VUPKGFBOKBGHFZ-UHFFFAOYSA-N 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- KLKFAASOGCDTDT-UHFFFAOYSA-N ethoxymethoxyethane Chemical compound CCOCOCC KLKFAASOGCDTDT-UHFFFAOYSA-N 0.000 description 2
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- GAEKPEKOJKCEMS-UHFFFAOYSA-N gamma-valerolactone Chemical compound CC1CCC(=O)O1 GAEKPEKOJKCEMS-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000001989 lithium alloy Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- CHCLGECDSSWNCP-UHFFFAOYSA-N methoxymethoxyethane Chemical compound CCOCOC CHCLGECDSSWNCP-UHFFFAOYSA-N 0.000 description 2
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 2
- BHIWKHZACMWKOJ-UHFFFAOYSA-N methyl isobutyrate Chemical compound COC(=O)C(C)C BHIWKHZACMWKOJ-UHFFFAOYSA-N 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000002153 silicon-carbon composite material Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- YTZKOQUCBOVLHL-UHFFFAOYSA-N tert-butylbenzene Chemical compound CC(C)(C)C1=CC=CC=C1 YTZKOQUCBOVLHL-UHFFFAOYSA-N 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- 239000011135 tin Substances 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- LUVQJDCOCWBMEN-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropan-2-yl bis(prop-2-ynyl) phosphate Chemical compound P(=O)(OCC#C)(OCC#C)OC(C(F)(F)F)C(F)(F)F LUVQJDCOCWBMEN-UHFFFAOYSA-N 0.000 description 1
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
- OQMIRQSWHKCKNJ-UHFFFAOYSA-N 1,1-difluoroethene;1,1,2,3,3,3-hexafluoroprop-1-ene Chemical group FC(F)=C.FC(F)=C(F)C(F)(F)F OQMIRQSWHKCKNJ-UHFFFAOYSA-N 0.000 description 1
- OSUGFVIHMXAUEN-UHFFFAOYSA-N 1,1-difluoroethene;1,1,2-trichloroethene Chemical group FC(F)=C.ClC=C(Cl)Cl OSUGFVIHMXAUEN-UHFFFAOYSA-N 0.000 description 1
- XLOFNXVVMRAGLZ-UHFFFAOYSA-N 1,1-difluoroethene;1,1,2-trifluoroethene Chemical group FC(F)=C.FC=C(F)F XLOFNXVVMRAGLZ-UHFFFAOYSA-N 0.000 description 1
- CIKVTYVSUSJJAA-UHFFFAOYSA-N 1,1-difluoroethene;fluoroethene Chemical group FC=C.FC(F)=C CIKVTYVSUSJJAA-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- GDXHBFHOEYVPED-UHFFFAOYSA-N 1-(2-butoxyethoxy)butane Chemical compound CCCCOCCOCCCC GDXHBFHOEYVPED-UHFFFAOYSA-N 0.000 description 1
- HQSLKNLISLWZQH-UHFFFAOYSA-N 1-(2-propoxyethoxy)propane Chemical compound CCCOCCOCCC HQSLKNLISLWZQH-UHFFFAOYSA-N 0.000 description 1
- HFZLSTDPRQSZCQ-UHFFFAOYSA-N 1-pyrrolidin-3-ylpyrrolidine Chemical compound C1CCCN1C1CNCC1 HFZLSTDPRQSZCQ-UHFFFAOYSA-N 0.000 description 1
- 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 1
- UHOPWFKONJYLCF-UHFFFAOYSA-N 2-(2-sulfanylethyl)isoindole-1,3-dione Chemical compound C1=CC=C2C(=O)N(CCS)C(=O)C2=C1 UHOPWFKONJYLCF-UHFFFAOYSA-N 0.000 description 1
- OSSBKXMASZTOSG-UHFFFAOYSA-N 2-(trifluoromethyl)oxolane Chemical compound FC(F)(F)C1CCCO1 OSSBKXMASZTOSG-UHFFFAOYSA-N 0.000 description 1
- QHTJSSMHBLGUHV-UHFFFAOYSA-N 2-methylbutan-2-ylbenzene Chemical compound CCC(C)(C)C1=CC=CC=C1 QHTJSSMHBLGUHV-UHFFFAOYSA-N 0.000 description 1
- JWUJQDFVADABEY-UHFFFAOYSA-N 2-methyltetrahydrofuran Chemical compound CC1CCCO1 JWUJQDFVADABEY-UHFFFAOYSA-N 0.000 description 1
- JHUUPUMBZGWODW-UHFFFAOYSA-N 3,6-dihydro-1,2-dioxine Chemical compound C1OOCC=C1 JHUUPUMBZGWODW-UHFFFAOYSA-N 0.000 description 1
- XKTYXVDYIKIYJP-UHFFFAOYSA-N 3h-dioxole Chemical compound C1OOC=C1 XKTYXVDYIKIYJP-UHFFFAOYSA-N 0.000 description 1
- DSMUTQTWFHVVGQ-UHFFFAOYSA-N 4,5-difluoro-1,3-dioxolan-2-one Chemical compound FC1OC(=O)OC1F DSMUTQTWFHVVGQ-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000006245 Carbon black Super-P Substances 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910000846 In alloy Inorganic materials 0.000 description 1
- JGFBQFKZKSSODQ-UHFFFAOYSA-N Isothiocyanatocyclopropane Chemical compound S=C=NC1CC1 JGFBQFKZKSSODQ-UHFFFAOYSA-N 0.000 description 1
- 229910000799 K alloy Inorganic materials 0.000 description 1
- 229910013733 LiCo Inorganic materials 0.000 description 1
- 229910002991 LiNi0.5Co0.2Mn0.3O2 Inorganic materials 0.000 description 1
- 229910013872 LiPF Inorganic materials 0.000 description 1
- 101150058243 Lipf gene Proteins 0.000 description 1
- RJUFJBKOKNCXHH-UHFFFAOYSA-N Methyl propionate Chemical compound CCC(=O)OC RJUFJBKOKNCXHH-UHFFFAOYSA-N 0.000 description 1
- 229910000528 Na alloy Inorganic materials 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 1
- ZVLDJSZFKQJMKD-UHFFFAOYSA-N [Li].[Si] Chemical compound [Li].[Si] ZVLDJSZFKQJMKD-UHFFFAOYSA-N 0.000 description 1
- QWJYDTCSUDMGSU-UHFFFAOYSA-N [Sn].[C] Chemical compound [Sn].[C] QWJYDTCSUDMGSU-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- HPZCUDJYOUMWRW-UHFFFAOYSA-N bis(prop-2-ynyl) trifluoromethyl phosphate Chemical compound P(=O)(OCC#C)(OCC#C)OC(F)(F)F HPZCUDJYOUMWRW-UHFFFAOYSA-N 0.000 description 1
- PWLNAUNEAKQYLH-UHFFFAOYSA-N butyric acid octyl ester Natural products CCCCCCCCOC(=O)CCC PWLNAUNEAKQYLH-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003660 carbonate based solvent Substances 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 229940125904 compound 1 Drugs 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 150000003983 crown ethers Chemical class 0.000 description 1
- 150000004292 cyclic ethers Chemical class 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- RBBXSUBZFUWCAV-UHFFFAOYSA-N ethenyl hydrogen sulfite Chemical compound OS(=O)OC=C RBBXSUBZFUWCAV-UHFFFAOYSA-N 0.000 description 1
- 125000002573 ethenylidene group Chemical group [*]=C=C([H])[H] 0.000 description 1
- HHEIMYAXCOIQCJ-UHFFFAOYSA-N ethyl 2,2-dimethylpropanoate Chemical compound CCOC(=O)C(C)(C)C HHEIMYAXCOIQCJ-UHFFFAOYSA-N 0.000 description 1
- GUICUMLKEBGGLD-UHFFFAOYSA-N ethyl bis(prop-2-ynyl) phosphate Chemical compound C#CCOP(=O)(OCC)OCC#C GUICUMLKEBGGLD-UHFFFAOYSA-N 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- DWYMPOCYEZONEA-UHFFFAOYSA-L fluoridophosphate Chemical compound [O-]P([O-])(F)=O DWYMPOCYEZONEA-UHFFFAOYSA-L 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 1
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 1
- LHJOPRPDWDXEIY-UHFFFAOYSA-N indium lithium Chemical compound [Li].[In] LHJOPRPDWDXEIY-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009830 intercalation Methods 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
- WDAXFOBOLVPGLV-UHFFFAOYSA-N isobutyric acid ethyl ester Natural products CCOC(=O)C(C)C WDAXFOBOLVPGLV-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- OBTSLRFPKIKXSZ-UHFFFAOYSA-N lithium potassium Chemical compound [Li].[K] OBTSLRFPKIKXSZ-UHFFFAOYSA-N 0.000 description 1
- VVNXEADCOVSAER-UHFFFAOYSA-N lithium sodium Chemical compound [Li].[Na] VVNXEADCOVSAER-UHFFFAOYSA-N 0.000 description 1
- UIDWHMKSOZZDAV-UHFFFAOYSA-N lithium tin Chemical compound [Li].[Sn] UIDWHMKSOZZDAV-UHFFFAOYSA-N 0.000 description 1
- CUONGYYJJVDODC-UHFFFAOYSA-N malononitrile Chemical compound N#CCC#N CUONGYYJJVDODC-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- HSAPVOPSUVJVGL-UHFFFAOYSA-N methyl bis(prop-2-ynyl) phosphate Chemical compound C#CCOP(=O)(OC)OCC#C HSAPVOPSUVJVGL-UHFFFAOYSA-N 0.000 description 1
- 229940017219 methyl propionate Drugs 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 description 1
- UUIQMZJEGPQKFD-UHFFFAOYSA-N n-butyric acid methyl ester Natural products CCCC(=O)OC UUIQMZJEGPQKFD-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- RKEWSXXUOLRFBX-UHFFFAOYSA-N pimavanserin Chemical compound C1=CC(OCC(C)C)=CC=C1CNC(=O)N(C1CCN(C)CC1)CC1=CC=C(F)C=C1 RKEWSXXUOLRFBX-UHFFFAOYSA-N 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229940090181 propyl acetate Drugs 0.000 description 1
- AIKFSRURHOARNU-UHFFFAOYSA-N propyl bis(prop-2-ynyl) phosphate Chemical compound CCCOP(=O)(OCC#C)OCC#C AIKFSRURHOARNU-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 238000007614 solvation Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002345 surface coating layer Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920006259 thermoplastic polyimide Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- QHGNHLZPVBIIPX-UHFFFAOYSA-N tin(ii) oxide Chemical compound [Sn]=O QHGNHLZPVBIIPX-UHFFFAOYSA-N 0.000 description 1
- XHGIFBQQEGRTPB-UHFFFAOYSA-N tris(prop-2-enyl) phosphate Chemical compound C=CCOP(=O)(OCC=C)OCC=C XHGIFBQQEGRTPB-UHFFFAOYSA-N 0.000 description 1
- 238000009461 vacuum packaging Methods 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
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)
Abstract
In order to solve the problems of high internal resistance and influence on the quick charge performance of the conventional lithium ion battery, the application provides a nonaqueous electrolyte and a lithium ion battery, wherein the nonaqueous electrolyte comprises an additive, and the additive comprises a compound shown in a structural formula 1 and a structural formula 2:wherein R is 1 、R 2 Each independently selected from the group consisting of an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an ether bond-containing alkyl group having 1 to 5 carbon atoms, and an ether bond-containing sulfonylalkyl group having 1 to 5 carbon atoms; r is R 3 、R 4 、R 5 Each independently selected from a silane group having 1 to 5 carbon atoms, a silane group having 2 to 7 carbon atoms, and a fluorosilane group having 1 to 5 carbon atoms. The non-aqueous electrolyte provided by the application has the advantages of reducing the internal resistance of the battery and improving the quick charge performance of the battery.
Description
Technical Field
The application belongs to the technical field of energy storage batteries, and particularly relates to a nonaqueous electrolyte and a lithium ion battery.
Background
Lithium ion batteries are widely used in life production due to their excellent performance, and as electric automobiles are popularized and market share increases year by year, lithium ion secondary batteries and the like with high energy density have become important development points in recent years, and meanwhile, have higher requirements on high-temperature performance and cycle performance of the batteries.
Because of the requirements of the use occasions, other electrochemical performances such as high-temperature performance, quick charge performance, low-temperature performance and the like have certain requirements except for ensuring certain cycle life. In the current lithium ion battery electrolyte formula, in order to meet the cycle performance requirement of the battery and improve various performances of the lithium ion battery, many researches improve interface compatibility of the electrode and the electrolyte by adding additives with different functions (such as a negative electrode film forming additive, a positive electrode protecting additive and the like) into the electrolyte, so as to improve various performances of the battery. For example, the cycle characteristics of the battery are improved by adding conventional film-forming additives such as vinylene carbonate, vinyl acetate, vinyl sulfite, thiophene, etc. to the electrolyte. The film forming additive can generate decomposition reaction on the surface of the negative electrode in preference to solvent molecules, and can form a passivation film on the surface of the negative electrode to prevent electrolyte from further decomposing on the surface of the electrode, thereby improving the cycle performance of the battery. The conventional film forming additive mainly acts on the surface of the negative electrode, and after film forming, the internal resistance of the battery can be increased, and the quick charge performance of the battery is affected. In addition, the performance of the battery under the high temperature condition mainly depends on the stability of the positive electrode interface, and the conventional film forming additive does not have the effect of stabilizing the positive electrode, so that an electrolyte solution scheme capable of improving the cycle performance of the battery without increasing the internal resistance of the battery and having good high-temperature storage performance is needed, so that the battery has good cycle performance, and meanwhile, the internal resistance of the battery is reduced, and the high-temperature storage performance of the battery is improved.
Disclosure of Invention
Aiming at the problems of high internal resistance and influence on the quick charge performance of the conventional lithium ion battery, the invention provides a non-aqueous electrolyte and a lithium ion battery.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in one aspect, the present invention provides a nonaqueous electrolyte comprising an additive comprising a compound represented by structural formula 1 and structural formula 2:
wherein R is 1 、R 2 Each independently selected from 1-5 carbonsAn alkyl group having an atomic number, an alkenyl group having 2 to 7 carbon atoms, an alkyl group having 1 to 5 carbon atoms and a sulfonylalkyl group having 1 to 5 carbon atoms and having an ether bond;
R 3 、R 4 、R 5 each independently selected from a silane group having 1 to 5 carbon atoms, a silane group having 2 to 7 carbon atoms, and a fluorosilane group having 1 to 5 carbon atoms.
Preferably, the mass content of the compound represented by the structural formula 1 is in the range of 0.1% to 1% based on 100% by mass of the nonaqueous electrolytic solution.
Preferably, the mass content of the compound represented by the structural formula 2 is in the range of 0.1% to 1% based on 100% by mass of the nonaqueous electrolytic solution.
Preferably, the compound shown in the structural formula 1 is at least one of the following compounds:
The compound shown in the structural formula 2 is selected from the following compounds:
preferably, the nonaqueous electrolytic solution further comprises a lithium salt including LiBF 4 、LiPF 6 、LiAsF 6 、LiClO 4 、LiBOB、LiDFOB、LiFSI、LiTFSI、LiCH 3 SO 3 、LiPO 2 F 2 、LiSbF 6 、LiCF 3 SO 3 、LiC(SO 2 CF 3 ) 3 、LiN(SO 2 C 2 F 5 ) 2 、LiCl、LiBr、LiI、LiB 10 Cl 10 、LiAlCl 4 At least one of lithium chloroborane, lithium difluorodioxalate phosphate, lithium lower aliphatic carboxylate having 4 or less carbon atoms, lithium tetraphenylborate, and lithium iminoborate;
the molar concentration of the lithium salt is 0.5mol/L to 1.5mol/L.
Preferably, the nonaqueous electrolyte further comprises a nonaqueous organic solvent including at least one of cyclic carbonates, linear carbonates, carboxylic acid esters, sulfones, ethers, and nitriles;
the mass content of the solvent is 5-80% based on 100% of the total mass of the nonaqueous electrolyte.
Preferably, the nonaqueous electrolyte further comprises an auxiliary additive, wherein the auxiliary additive comprises at least one of a cyclic sulfate compound, a sultone compound, a cyclic carbonate compound, a phosphate compound, a borate compound and a nitrile compound;
the mass content of the auxiliary additive is 0.01-10% based on 100% of the total mass of the nonaqueous electrolyte.
Preferably, the cyclic sulfate compound is selected from the group consisting of vinyl sulfate, propylene sulfate, vinyl methyl sulfate, At least one of (a) and (b);
the sultone compound is at least one selected from 1, 3-propane sultone, 1, 4-butane sultone, 1, 3-propylene sultone and methyl disulfonic acid methylene ester;
the cyclic carbonate compound is selected from ethylene carbonate, methylene ethylene carbonate, fluoroethylene carbonate, trifluoromethyl ethylene carbonate, bis-fluoroethylene carbonate or structure
At least one of the compounds represented by formula 3:
in the structural formula 3, R 21 、R 22 、R 23 、R 24 、R 25 、R 26 Each independently selected from one of a hydrogen atom, a halogen atom, a C1-C5 group;
the phosphate compound is at least one selected from tri (trimethylsilane) phosphite ester or a compound shown in a structural formula 4:
in the structural formula 4, R 31 、R 32 、R 33 Each independently selected from the group consisting of C1-C5 saturated hydrocarbon groups, C1-C5 unsaturated hydrocarbon groups, C1-C5 halogenated hydrocarbon groups, and R 31 、R 32 、R 33 At least one of them is an unsaturated hydrocarbon group;
the borate compound is at least one selected from tri (triethylsilane) borate and tri (trimethylsilane) borate;
the nitrile compound is at least one selected from succinonitrile, glutaronitrile, ethylene glycol bis (propionitrile) ether, hexanedinitrile, adiponitrile, pimelic nitrile, suberonitrile, nonyldinitrile and decyldinitrile.
Preferably, the lithium ion battery satisfies the following relationship:
0.2-8 [ (a+b) ×c ]/10-6-9;
wherein a is the mass content of the compound shown in the structural formula 1 in the nonaqueous electrolyte, and the unit is;
b is the mass content of the compound shown in the structural formula 2 in the nonaqueous electrolyte, and the unit is;
c is the pH value of the positive electrode active material.
Preferably, the lithium ion battery satisfies the following relationship: and [ (a+b) ×c ]/10 is less than or equal to 0.5 and less than or equal to 2.
Preferably, the pH c of the positive electrode active material is 7 to 8.
According to the non-aqueous electrolyte provided by the application, the compound shown in the structural formula 1 and the structural formula 2 are added into the non-aqueous electrolyte, the compound shown in the structural formula 1 can complex a small amount of free oxygen in the electrolyte, film formation is carried out at a negative electrode interface, electrolyte decomposition is reduced, electrolyte action at a high temperature is stabilized, high-temperature performance of a battery is improved, high-temperature gas production of the electrolyte is inhibited, but the compound shown in the structural formula 1 can cause increase of internal resistance of the battery when being decomposed at a positive electrode, the compound shown in the structural formula 2 is added to cooperate with the compound shown in the structural formula 1, a silicon-oxygen bond in the compound shown in the structural formula 2 in the electrolyte is unstable, the compound is easy to break under the positive electrode oxidation action of the battery, and a complex is formed by combining with the compound shown in the structural formula 1, so that the decomposition of the compound shown in the structural formula 1 at the positive electrode interface is reduced, the internal resistance of the battery is further reduced, and the quick charge performance of the battery is improved. The non-aqueous electrolyte provided by the application is applied to a battery, and has the advantages of improving the high-temperature storage performance of the battery, reducing the internal resistance of the battery, inhibiting the high-temperature gas production of the battery and realizing the quick charge performance of the battery on the premise of ensuring that the cycle performance of the battery is not reduced.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a non-aqueous electrolyte, which comprises an additive, wherein the additive comprises a compound shown in a structural formula 1 and a structural formula 2:
wherein R is 1 、R 2 Each independently selected from the group consisting of an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an ether bond-containing alkyl group having 1 to 5 carbon atoms, and a sulfonylalkyl group having 1 to 5 carbon atoms;
R 3 、R 4 、R 5 each independently selected from a silane group having 1 to 5 carbon atoms, a silane group having 2 to 7 carbon atoms, and a fluorosilane group having 1 to 5 carbon atoms.
It is understood that alkyl groups having 1 to 5 carbon atoms, such as straight chain alkyl groups having 1 to 5 carbon atoms, such as methyl, ethyl, etc., may be used, and alkyl groups having 1 to 5 carbon atoms, such as isobutyl, etc., which contain a branched chain may be used. Similarly, alkenyl groups of 2 to 7 carbon atoms may be branched or straight chain alkenyl groups.
The compound shown in the structural formula 1 is added into the electrolyte, so that a small amount of free oxygen in the electrolyte can be complexed, film formation is carried out on a negative electrode, the decomposition of the electrolyte is reduced, the electrolyte action at a high temperature is stabilized, the high-temperature storage performance of the battery is improved, and the high-temperature gas production of the electrolyte is inhibited, but the compound shown in the structural formula 1 is also subjected to ring opening decomposition on a positive electrode to form a B-O chain compound which covers the surface of the positive electrode, and the generated product can increase the internal resistance of an interface film of the positive electrode, so that the internal resistance of the battery is increased, the initial internal resistance of the battery is increased, and the quick-charge performance of the battery is not facilitated. Through a great deal of researches, the inventor discovers that the compound shown in the structural formula 2 is added into the nonaqueous electrolyte, the compound shown in the structural formula 2 is cooperated with the compound shown in the structural formula 1, the silicon-oxygen bond in the compound shown in the structural formula 2 in the electrolyte is unstable and is easy to break under the oxidation action of the positive electrode of the battery, and the compound is combined with the compound shown in the structural formula 1 to form a stable complex, so that the decomposition of the compound shown in the structural formula 1 at the positive electrode interface is reduced, the internal resistance of the battery is further reduced, and the quick charge performance of the battery is improved. The non-aqueous electrolyte provided by the application is applied to a battery, can improve the high-temperature storage performance of the battery, reduce the internal resistance of the battery, does not reduce the cycle performance of the battery, inhibits the high-temperature gas production of the battery, and realizes the quick charge performance of the battery.
In some embodiments, the mass content of the compound of formula 1 ranges from 0.1% to 5% based on 100% total mass of the electrolyte. The mass content of the compound shown in the structural formula 2 in the nonaqueous electrolyte is in the range of 0.1-5%.
Specifically, the mass content of the compound shown in the structural formula 1 in the nonaqueous electrolyte is in the range of 0.1% -5%, a small amount of free oxygen in the electrolyte can be complexed, the film is formed on a negative electrode, the decomposition of the electrolyte is reduced, the electrolyte action at high temperature is stabilized, the high-temperature performance of the battery is improved, and the high-temperature gas production of the electrolyte is inhibited. If the mass content a of the compound shown in the structural formula 1 in the nonaqueous electrolyte is less than 0.1%, the additive is added too little to play a role in the electrolyte, and the effect of improving the battery performance cannot be achieved; if the mass content a of the compound represented by structural formula 1 in the nonaqueous electrolytic solution is more than 5%, the interfacial film formed at the negative electrode interface increases in thickness, and at the same time, the decomposition at the positive electrode increases, which may cause an excessively large increase in the internal resistance of the battery, deteriorating the battery performance. The mass content a of the compound represented by the structural formula 1 in the nonaqueous electrolytic solution may be 0.1%,0.3%, 0.5%, 0.7%, 0.9%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0% or the like, as long as the value of a is within a range of 0.1% to 5%.
The compound shown in the structural formula 2 added into the electrolyte can play a synergistic effect with the compound shown in the structural formula 1, inhibit the decomposition of the compound shown in the structural formula 1 at the positive electrode interface, further reduce the internal resistance of the battery, eliminate the influence of the increase of the internal resistance of the electrolyte caused by the use of the compound shown in the structural formula 1, and improve the quick charge performance of the battery. If the mass content b of the compound shown in the structural formula 2 in the nonaqueous electrolyte is less than 0.1%, the additive is added too little to play a role in the electrolyte, and the effect of improving the battery performance cannot be achieved; if the mass content b of the compound shown in the structural formula 2 in the nonaqueous electrolyte is more than 5%, the chromaticity and acidity of the electrolyte are enhanced, the acidic increase causes dissolution of the anode-cathode interface film, the structural stability of the film is destroyed, and a series of problems such as continuous decomposition of the electrolyte are caused. The mass content b of the compound represented by the structural formula 2 in the nonaqueous electrolytic solution may be 0.1%,0.3%, 0.5%, 0.7%, 0.9%, 1.0%, 1.5%, 2.0%, 3.0%, 4.0%, 5.0% or the like, as long as the value of b is within a range of 0.1% to 5%.
In some preferred embodiments, the mass content of the compound of formula 1 ranges from 0.1% to 1% based on 100% total mass of the electrolyte.
The mass content a of the compound shown in the structural formula 1 added into the electrolyte is in the range of 0.1-1%, so that the electrolyte cost is reduced, meanwhile, a small amount of free oxygen in the electrolyte can be better complexed, the electrolyte decomposition is reduced, the electrolyte effect at high temperature is stabilized, the high-temperature performance of the battery is improved, the high-temperature gas production of the electrolyte is inhibited, and meanwhile, the compound is cooperated with the compound shown in the structural formula 2, the internal resistance of the battery is reduced, and the performance of the battery is improved.
In some preferred embodiments, the mass content of the compound of formula 2 ranges from 0.1% to 1% based on 100% total mass of the electrolyte.
The mass content b of the compound shown in the structural formula 2 added into the electrolyte is in the range of 0.1% -1%, so that the electrolyte can better cooperate with the compound shown in the structural formula 1, the internal resistance of the battery is reduced, and the performance of the battery is improved.
In some embodiments, the compound of formula 1 is selected from at least one of the following compounds:
the compound shown in the structural formula 2 is selected from the following compounds:
the above is a part of the compounds claimed in the present invention, but is not limited thereto, and should not be construed as limiting the present invention.
In some embodiments, the nonaqueous electrolyte further comprises a lithium salt comprising LiBF 4 、LiPF 6 、LiAsF 6 、LiClO 4 、LiBOB、LiDFOB、LiFSI、LiTFSI、LiCH 3 SO 3 、LiPO 2 F 2 、LiSbF 6 、LiCF 3 SO 3 、LiC(SO 2 CF 3 ) 3 、LiN(SO 2 C 2 F 5 ) 2 、LiCl、LiBr、LiI、LiB 10 Cl 10 、LiAlCl 4 At least one of lithium chloroborane, lithium difluorodioxalate phosphate, lithium lower aliphatic carboxylate having 4 or less carbon atoms, lithium tetraphenylborate, and lithium iminoborate;
the molar concentration of the lithium salt is 0.5mol/L to 1.5mol/L.
In some embodiments, the nonaqueous electrolyte includes a nonaqueous organic solvent including at least one of cyclic carbonates, linear carbonates, carboxylic acid esters, sulfones, ethers, and nitriles.
In some embodiments, the ether solvent includes cyclic or chain ethers, preferably chain ethers of 3 to 10 carbon atoms and cyclic ethers of 3 to 6 carbon atoms, which may be specifically but not limited to 1, 3-Dioxolane (DOL), 1, 4-Dioxane (DX), crown ethers, tetrahydrofuran (THF), 2-methyltetrahydrofuran (2-CH) 3 -THF), 2-trifluoromethyl tetrahydrofuran (2-CF) 3 -THF) at least one of; the chain ether may specifically be, but is not limited to, at least one of dimethoxymethane, diethoxymethane, ethoxymethoxymethane, ethylene glycol di-n-propyl ether, ethylene glycol di-n-butyl ether, diethylene glycol dimethyl ether, 1, 3-dioxolane, and 1, 2-tetrafluoroethyl-2, 3-tetrafluoropropyl ether. Since the chain ether has high solvation ability with lithium ions and can improve ion dissociation properties, dimethoxymethane, diethoxymethane and ethoxymethoxymethane, which have low viscosity and can impart high ion conductivity, are particularly preferable. The ether compound may be used alone, or two or more of them may be used in any combination and ratio. The amount of the ether compound to be added is not particularly limited, and is arbitrary within a range that does not significantly impair the effect of the lithium ion battery of the present invention, and is usually 1% or more, preferably 2% or more, more preferably 3% or more, and is usually 30% or less, preferably 25% or less, more preferably 20% or less, based on 100% by volume of the nonaqueous solvent. When two or more ether compounds are used in combination, the total amount of the ether compounds may be set to satisfy the above range. When the amount of the ether compound is within the above preferred range, the effect of improving the ionic conductivity due to the increase in the dissociation degree of lithium ions and the decrease in the viscosity of the chain ether can be easily ensured. In addition, when the negative electrode active material is a carbon material, co-intercalation of the chain ether and lithium ions can be suppressed, and thus the input/output characteristics and the charge/discharge rate characteristics can be brought into appropriate ranges.
In some embodiments, the nitrile solvent may be, but is not limited to, at least one of acetonitrile, glutaronitrile, malononitrile.
In some embodiments, the carbonate-based solvent includes a cyclic carbonate or a chain carbonate, which may be specifically but not limited to at least one of vinylene carbonate, ethylene Carbonate (EC), propylene Carbonate (PC), gamma-butyrolactone (GBL), butylene Carbonate (BC), butylene carbonate; the chain carbonate may be, but not limited to, at least one of dimethyl carbonate (DMC), ethylmethyl carbonate (EMC), diethyl carbonate (DEC), dipropyl carbonate (DPC). The content of the cyclic carbonate is not particularly limited, and is arbitrary within a range that does not significantly impair the effect of the lithium ion battery of the present invention, but in the case of using one of them alone, the lower limit of the content is usually 3% by volume or more, preferably 5% by volume or more, relative to the total amount of the solvent of the nonaqueous electrolytic solution. By setting the range, it is possible to avoid a decrease in conductivity due to a decrease in dielectric constant of the nonaqueous electrolyte solution, and it is easy to achieve a good range of high-current discharge characteristics, stability with respect to the negative electrode, and cycle characteristics of the nonaqueous electrolyte battery. The upper limit is usually 90% by volume or less, preferably 85% by volume or less, and more preferably 80% by volume or less. By setting the range, the oxidation/reduction resistance of the nonaqueous electrolytic solution can be improved, thereby contributing to improvement of stability at high-temperature storage. The content of the chain carbonate is not particularly limited, but is usually 15% by volume or more, preferably 20% by volume or more, and more preferably 25% by volume or more, based on the total amount of the solvent of the nonaqueous electrolytic solution. In addition, the volume ratio is usually 90% or less, preferably 85% or less, and more preferably 80% or less. By setting the content of the chain carbonate in the above range, the viscosity of the nonaqueous electrolytic solution can be easily set to an appropriate range, and the decrease in the ionic conductivity can be suppressed, thereby contributing to the improvement in the output characteristics of the nonaqueous electrolyte battery. When two or more kinds of chain carbonates are used in combination, the total amount of the chain carbonates may be set to satisfy the above range.
In some embodiments, it may also be preferable to use a chain carbonate having a fluorine atom (hereinafter simply referred to as "fluorinated chain carbonate"). The number of fluorine atoms in the fluorinated chain carbonate is not particularly limited as long as it is 1 or more, but is usually 6 or less, preferably 4 or less. In the case where the fluorinated chain carbonate has a plurality of fluorine atoms, these fluorine atoms may be bonded to the same carbon or may be bonded to different carbons. Examples of the fluorinated chain carbonate include fluorinated dimethyl carbonate derivatives, fluorinated ethyl methyl carbonate derivatives, and fluorinated diethyl carbonate derivatives.
The carboxylic acid ester solvent includes a cyclic carboxylic acid ester and/or a chain carbonate. Examples of the cyclic carboxylic acid ester include: at least one of gamma-butyrolactone, gamma-valerolactone and delta-valerolactone. Examples of the chain carbonate include, for example: at least one of methyl formate, methyl Acetate (MA), ethyl Acetate (EA), propyl acetate (EP), butyl acetate, propyl Propionate (PP), butyl propionate, methyl propionate, ethyl propionate, methyl butyrate, methyl isobutyrate, methyl trimethylacetate, and ethyl trimethylacetate.
In some embodiments, the sulfone-based solvent includes cyclic sulfones and chain sulfones, preferably compounds having generally 3 to 6 carbon atoms, preferably 3 to 5 carbon atoms in the case of cyclic sulfones, and generally 2 to 6 carbon atoms, preferably 2 to 5 carbon atoms in the case of chain sulfones. The amount of the sulfone-based solvent to be added is not particularly limited, and is arbitrary within a range that does not significantly impair the effect of the lithium ion battery of the present invention, and is usually 0.3% or more by volume, preferably 0.5% or more by volume, more preferably 1% or more by volume, and is usually 40% or less by volume, preferably 35% or less by volume, more preferably 30% or less by volume, based on the total amount of the solvent of the nonaqueous electrolyte. When two or more sulfone solvents are used in combination, the total amount of sulfone solvents may be set to satisfy the above range. When the amount of the sulfone-based solvent added is within the above range, a nonaqueous electrolytic solution excellent in high-temperature storage stability tends to be obtained.
In a preferred embodiment, the solvent is a mixture of cyclic carbonates and chain carbonates.
The mass content of the solvent is 5-80% based on 100% of the total mass of the nonaqueous electrolyte.
In some embodiments, the nonaqueous electrolytic solution further includes an additive including at least one of a cyclic sulfate compound, a sultone compound, a cyclic carbonate compound, a phosphate compound, a borate compound, and a nitrile compound;
the addition amount of the auxiliary additive is 0.01% -10% based on 100% of the total mass of the nonaqueous electrolyte.
In some embodiments, the cyclic sulfate compound includes vinyl sulfate, propylene sulfate, vinyl methyl sulfate,At least one of (a) and (b);
the sultone compound is at least one selected from 1, 3-propane sultone, 1, 4-butane sultone, 1, 3-propylene sultone and methyl disulfonic acid methylene ester;
the cyclic carbonate compound is at least one selected from Vinylene Carbonate (VC), ethylene carbonate, fluoroethylene carbonate or a compound shown in a structural formula 3:
in the structural formula 3, R 21 、R 22 、R 23 、R 24 、R 25 、R 26 Each independently selected from one of a hydrogen atom, a halogen atom, a C1-C5 group;
the phosphate compound is selected from at least one of tris (trimethylsilane) phosphite or a compound shown in a structural formula 4:
In the structural formula 4, R 31 、R 32 、R 33 Each independently selected from the group consisting of C1-C5 saturated hydrocarbon groups, C1-C5 unsaturated hydrocarbon groups, C1-C5 halogenated hydrocarbon groups, and R 31 、R 32 、R 33 At least one of them is an unsaturated hydrocarbon group;
the borate compound is selected from tri (triethylsilane) borate;
in a preferred embodiment, the unsaturated phosphate compound may be at least one of tripropylethyl phosphate, dipropargyl methyl phosphate, dipropargyl ethyl phosphate, dipropargyl propyl phosphate, dipropargyl trifluoromethyl phosphate, dipropargyl-2, 2-trifluoroethyl phosphate, dipropargyl-3, 3-trifluoropropyl phosphate, dipropargyl hexafluoroisopropyl phosphate, triallyl phosphate, diallyl methyl phosphate, diallyl ethyl phosphate, diallyl propyl phosphate, diallyl trifluoromethyl phosphate, diallyl-2, 2-trifluoroethyl phosphate, diallyl-3, 3-trifluoropropyl phosphate, diallyl hexafluoroisopropyl phosphate;
the nitrile compound is at least one selected from succinonitrile, glutaronitrile, ethylene glycol bis (propionitrile) ether, hexanedinitrile, adiponitrile, pimelic nitrile, suberonitrile, nonyldinitrile and decyldinitrile.
In other embodiments, the additive may further comprise other additives that improve battery performance: for example, additives that enhance the safety performance of the battery, specifically flame retardant additives such as fluorophosphate and cyclophosphazene, or overcharge-preventing additives such as t-amyl benzene and t-butyl benzene.
In general, the amount of any one of the optional substances in the additive to be added to the nonaqueous electrolytic solution is 10% or less, preferably 0.1 to 5%, and more preferably 0.1 to 2%, unless otherwise specified. Specifically, the addition amount of any optional substance in the additive may be 0.05%, 0.08%, 0.1%, 0.5%, 0.8%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 7.8%, 8.5%, 9%, 9.5%, 10%.
In some embodiments, when the additive is selected from fluoroethylene carbonate, the fluoroethylene carbonate is added in an amount of 0.05% to 10% based on 100% of the total mass of the nonaqueous electrolytic solution.
In another aspect, the present application provides a lithium ion battery, including the above-mentioned nonaqueous electrolyte and a positive electrode, the positive electrode including a positive electrode active material, the lithium ion battery satisfying the following relation:
0.2-8 [ (a+b) ×c ]/10-5, and 0.1-5, 6-9;
wherein a is the mass content of the compound shown in the structural formula 1 in the nonaqueous electrolyte, and the unit is;
b is the mass content of the compound shown in the structural formula 2 in the nonaqueous electrolyte, and the unit is;
c is the pH value of the positive electrode active material.
When the electrolyte is used for preparing a lithium ion battery, the positive electrode active material peracid or peracid can cause decomposition of the compound shown in the structural formula 1, the electrolyte is decomposed, the high-temperature performance of the battery is reduced, the peracid or peracid can also cause decomposition of the compound shown in the structural formula 2, the compound shown in the structural formula 2 cannot cooperate with the compound shown in the structural formula 1 to reduce the decomposition of the compound shown in the structural formula 1 at the positive electrode interface, the internal resistance of the battery is increased, and the quick charge performance is reduced. Through a great deal of researches, the inventor finds that a certain relationship exists between the pH value of the positive electrode active material and the decomposition of the compound shown in the compound 1 and the compound shown in the structural formula 2, when the mass content a of the compound shown in the structural formula 1, the mass content b of the compound shown in the structural formula 2 and the pH value c of the positive electrode active material meet the relationship of 0.2-5 [ (a+b). C ]/10-9, the pH value a is more than or equal to 0.1-5, the pH value b is more than or equal to 0.1-5, the pH value c of the positive electrode active material is cooperatively defined, the decomposition of the compound shown in the structural formula 1 and the compound shown in the structural formula 2 in the electrolyte caused by the acidity or the alkalinity of the positive electrode active material is avoided, the functional exertion of the compound shown in the structural formula 1 and the compound shown in the structural formula 2 is not influenced, the compound shown in the structural formula 1 can complex a small amount of free oxygen in electrolyte, forms a film at a negative electrode interface, reduces the decomposition of the electrolyte, stabilizes the electrolyte action at high temperature, improves the high-temperature performance of the battery, inhibits the high-temperature gas production of the electrolyte, meanwhile, the silicon oxygen bond in the compound shown in the structural formula 2 in the electrolyte is unstable and is easy to break under the oxidation action of the positive electrode of the battery, the compound shown in the structural formula 2 cooperates with the compound shown in the structural formula 1 to form a complex, the complex is combined with the compound shown in the structural formula 1, the decomposition of the compound shown in the structural formula 1 at the positive electrode interface is reduced, the influence of the increase of the internal resistance of the electrolyte caused by using the compound shown in the structural formula 1 can be eliminated, the internal resistance of the battery is further reduced, and the quick charge performance of the battery is improved. The lithium ion battery provided by the application has the advantages of reducing the internal resistance of the battery, improving the high-temperature storage performance of the battery, inhibiting the high-temperature gas production of the battery and realizing the quick charge performance of the battery on the premise of ensuring that the cycle performance of the battery is not reduced.
If the lithium ion battery relation [ (a+b) ×c ]/10 is less than 0.2, the addition amount of the compound shown in the structural formula 1 and/or the compound shown in the structural formula 2 is low, or the pH value of the positive electrode active material is low and the acidity is too high, the decomposition of the compound shown in the structural formula 1 and the compound shown in the structural formula 2 in the electrolyte is caused by the too high acidity of the positive electrode active material, the compound shown in the structural formula 1 and the compound shown in the structural formula 2 are affected to play roles, the battery performance cannot be obviously improved, and the gas production of the battery is increased. If the relation [ (a+b) ×c ]/10 of the lithium ion battery is larger than 8, the cathode active material is too strong in alkalinity, residual alkali on the surface of the cathode material is decomposed, the released oxygen promotes the decomposition acceleration of electrolyte, and particularly under the high temperature condition, the volume expansion of the battery is larger, so that the internal polarization of the battery is increased, the internal resistance of the battery is increased, and the cycle performance of the battery is reduced. Specifically, the value of the relation [ (a+b) ×c ]/10 of the lithium ion battery may be 0.2, 1.0, 1.5, 2.0, 2.4, 2.9, 3.0, 3.3, 3.5, 3.8, 4.0, 4.5, 5.0, 6.0, 7.0, 8.0, etc., as long as the value of the relation is between 0.2 and 8.0.
In some preferred embodiments, the lithium ion battery satisfies the following relationship: and [ (a+b) ×c ]/10 is less than or equal to 0.5 and less than or equal to 2.
The relation value of the lithium ion battery is in the preferred range of 0.5-2, the battery has better high-temperature storage performance and cycle performance, the internal resistance of the battery is lower, and the gas production of the battery is less.
In some embodiments, the pH c of the positive electrode active material is 6-9.
The pH value of the positive electrode active material is less than 6, the high acidity has a dissolution effect on the battery interface film, the pH value of the positive electrode active material is more than 9, the alkalinity is strong, and when the battery is charged to a certain voltage, the electrolyte is decomposed to generate gas. The peracid or the overbase of the positive electrode active material can cause the decomposition of the compound shown in the structural formula 1 or the compound shown in the structural formula 2 or other auxiliary additives, organic solvents, increase the side reaction of the battery and increase the gas production.
In some preferred embodiments, the pH c of the positive electrode active material is 7-8. The pH value c of the positive electrode active material is within the above preferred range, so that the decomposition of the compound shown in the structural formula 1 and the compound shown in the structural formula 2 in the electrolyte caused by the excessive acidity or alkalinity of the positive electrode active material can be effectively avoided, and corrosion of the positive electrode interface film and the like can be prevented.
In some embodiments, the positive electrode includes a positive electrode material layer that is blended from a positive electrode active material, a positive electrode conductive agent, and a positive electrode binder.
In some embodiments, the positive electrode active material includes at least one of lithium cobaltate, lithium manganate, lithium iron phosphate, ternary materials.
Further, the positive electrode active material includes LiNi x Co y Mn z L (1-x-y-z) O 2 、LiCo x＇ L (1-x′) O 2 、LiNi x＇＇ L’ y＇ Mn (2-x＇＇-y＇) O 4 、Li z＇ MPO 4 Wherein L is at least one of Al, sr, mg, ti, ca, zr, zn, si or Fe, 0.ltoreq.x.ltoreq.1, 0.ltoreq.y.ltoreq.1, 0.ltoreq.z.ltoreq.1, 0 < x+y+z.ltoreq.1, 0<x 'is less than or equal to 1, x' is less than or equal to 0.3 and less than or equal to 0.6, y 'is less than or equal to 0.01 and less than or equal to 0.2, and L' is at least one of Co, al, sr, mg, ti, ca, zr, zn, si, fe; z' is more than or equal to 0.5 and less than or equal to 1, M is at least one of Fe, mn and Co.
The positive electrode conductive agent comprises at least one of conductive carbon black, conductive carbon spheres, conductive graphite, SP, conductive carbon fibers, carbon nanotubes, graphene or reduced graphene oxide. Preferred are carbon nanotubes, SP, conductive graphite.
The positive electrode binder includes thermoplastic resins such as polyvinylidene fluoride, a copolymer of vinylidene fluoride, polytetrafluoroethylene, a copolymer of vinylidene fluoride-hexafluoropropylene, a copolymer of tetrafluoroethylene-perfluoroalkyl vinyl ether, a copolymer of ethylene-tetrafluoroethylene, a copolymer of vinylidene fluoride-trifluoroethylene, a copolymer of vinylidene fluoride-trichloroethylene, a copolymer of vinylidene fluoride-fluoroethylene, a copolymer of vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene, thermoplastic polyimide, polyethylene, polypropylene, and the like; an acrylic resin; sodium hydroxymethyl cellulose; polyvinyl butyral; ethylene-vinyl acetate copolymers; polyvinyl alcohol; and at least one of styrene butadiene rubber.
In some embodiments, the positive electrode further comprises a positive electrode current collector, and the positive electrode material layer is formed on a surface of the positive electrode current collector.
The positive current collector is selected from a metal material that can conduct electrons, preferably, the positive current collector includes at least one of Al, ni, tin, copper, stainless steel, and in a more preferred embodiment, the positive current collector is selected from aluminum foil.
In some embodiments, the lithium ion battery further comprises a negative electrode comprising a negative electrode material layer comprising a negative electrode active material selected from at least one of a carbon material, a carbon-silicon composite, a silicon-based negative electrode, a lithium-based negative electrode, a tin-based negative electrode.
In preferred embodiments, the carbon material may include graphite, hard carbon, soft carbon, graphene, mesophase carbon microspheres, and the like.
Wherein the silicon-based negative electrode comprises at least one of a silicon material, a silicon oxide, a silicon-carbon composite material and a silicon alloy material; at least one of the lithium-based negative electrode metallic lithium or lithium alloy. The lithium alloy can be at least one of lithium silicon alloy, lithium sodium alloy, lithium potassium alloy, lithium aluminum alloy, lithium tin alloy and lithium indium alloy. The tin-based negative electrode comprises at least one of tin, tin carbon, tin oxygen and a tin metal compound.
In some embodiments, the negative electrode material layer further comprises a negative electrode binder and a negative electrode conductive agent, and the negative electrode active material, the negative electrode binder and the negative electrode conductive agent are blended to obtain the negative electrode material layer.
The selectable ranges of the negative electrode binder and the negative electrode conductive agent are the same as those of the positive electrode binder and the positive electrode conductive agent, respectively, and are not described in detail herein.
In some embodiments, the negative electrode tab further includes a negative electrode current collector, and the negative electrode material layer is formed on a surface of the negative electrode current collector.
The negative electrode current collector is selected from a metal material capable of conducting electrons, preferably, the negative electrode current collector comprises at least one of Al, ni, tin, copper, stainless steel, and in a more preferred embodiment, the negative electrode current collector is selected from copper foil.
In some embodiments, the separator includes a substrate layer including, but not limited to, single layer PP (polypropylene), single layer PE (polyethylene), double layer PP/PE, double layer PP/PP, and triple layer PP/PE/PP, etc., and a surface coating layer disposed on at least one side surface of the substrate layer.
The invention is further illustrated by the following examples.
Example 1
This example is for explaining a nonaqueous electrolyte and a lithium ion battery disclosed in the present invention.
1) Preparation of positive plate
Mixing ternary positive electrode active material LiNi according to the mass ratio of 93:4:3 0.5 Co 0.2 Mn 0.3 O 2 Dispersing conductive carbon black (Super-P) and a binder polyvinylidene fluoride (PVDF) in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry, uniformly coating the positive electrode slurry on two sides of an aluminum foil, drying, calendaring and vacuum drying, welding an aluminum outgoing line by an ultrasonic welding machine to obtain a positive electrode plate, wherein the thickness of the positive electrode plate is 120-150 mu m, and controlling the pressing of the positive electrode material by the surface density and the rolling thickness of the positive electrode materialSolid density, wherein the positive electrode compacted density is 3.0g/cm 3 -4.4g/cm 3 Between them. Testing of positive electrode active material LiNi 0.5 Co 0.2 Mn 0.3 O 2 The pH value c of (C) was 7.
2) Preparation of negative electrode sheet
Mixing artificial graphite, conductive carbon black, a binder Styrene Butadiene Rubber (SBR) and carboxymethyl cellulose (CMC) according to the mass ratio of 94:1:2.5:2.5, dispersing in deionized water to obtain negative electrode slurry, coating the negative electrode slurry on the surface of a conductive carbon layer, drying, calendaring and vacuum drying, and welding a nickel lead-out wire by an ultrasonic welder to obtain the negative plate.
3) Preparation of nonaqueous electrolyte
Ethylene Carbonate (EC), diethyl carbonate (DEC) and methyl ethyl carbonate (EMC) are mixed according to the mass ratio of EC: DEC: emc=1: 1:1, mixing, adding 1mol/L lithium hexafluorophosphate (LiPF) 6 ) And adding a compound shown in a structural formula 1 with a mass content of a and a compound shown in a structural formula 2 with a mass content of b into the electrolyte. And adding auxiliary additive, which can be at least one of cyclic sulfate compound, sultone compound, cyclic carbonate compound, phosphate compound, borate compound and nitrile compound. The content of the additive is 0.01-10% based on the total mass of the nonaqueous electrolyte. Wherein, the specific values of a and b are shown in table 1.
4) Preparation of lithium ion battery cell
And placing a three-layer isolating film with the thickness of 20 mu m between the positive plate and the negative plate, winding a sandwich structure formed by the positive plate, the negative plate and the diaphragm, flattening the winding body, putting the flattened winding body into a square aluminum metal shell, respectively welding outgoing lines of the positive and negative electrodes on corresponding positions of a cover plate, welding the cover plate and the metal shell into a whole by using a laser welding machine, and baking the whole in vacuum at the temperature of 75 ℃ for more than 48 hours to obtain the battery cell to be injected with the liquid.
5) Injection and formation of battery cell
And (3) in a glove box with the dew point controlled below-40 ℃, injecting the prepared nonaqueous electrolyte into the battery cell, wherein the amount of the electrolyte is required to ensure that the battery cell is full of gaps, and standing for 72h after vacuum packaging. Then the first charge is conventionally formed by the following steps: and (3) carrying out constant current charging at 0.05C for 180min, carrying out constant current charging at 0.2C to 3.95V, carrying out secondary vacuum sealing, then further carrying out constant current charging at 0.2C to 4.4V to cut off voltage, and carrying out constant current discharging at 0.2C to 3.0V after standing for 24h at normal temperature.
Examples 2 to 19 and comparative examples 1 to 6
Examples 2 to 19 and comparative examples 1 to 6 are for illustrating the electrolytes and batteries disclosed in the present invention, and include most of the procedures in example 1, except that the types and mass contents a of the compounds represented by structural formula 1 added to the electrolytes are different, the types and mass contents b of the compounds represented by structural formula 2 added to the electrolytes are different, and the types and contents of the auxiliary additives are specifically shown in table 1.
TABLE 1 electrolyte parameter tables for examples 1-19 and comparative examples 1-6
/>
Performance testing
The lithium ion batteries prepared in examples 1 to 19 and comparative examples 1 to 6 described above were subjected to the following performance tests.
DCIR performance test at 25 ℃):
the battery is charged to 4.3V with a constant current and a constant voltage of 0.5C at 25 ℃, then charged with a constant voltage of 4.3V, cut off the current of 0.005C, then discharged to 3.0V with a constant current of 0.5C, and pre-circulated for 2 circles. Then, 0.5C constant current constant voltage charge was carried out to 50% charge capacity, and the mixture was left at 25 ℃ for 3 hours, and was charged and discharged at 0.1C, 0.2C, and 0.5C for 10 seconds, respectively, during which the mixture was left at rest for 40 seconds, and DCIR internal resistance at 25 ℃ was calculated.
And (3) performing normal-temperature cycle test at 25 ℃:
charging the battery to 4.3V at constant current and constant voltage of 0.5C and 4.3V at constant voltage at 25 ℃, and stopping current at 0.005C; then discharged to 3.0V with a constant current of 0.5C, pre-cycled for 2 cycles. Then, the mixture was left at 45℃for 3 hours, 1C constant current and constant voltage was charged to 4.3V,1C constant current was discharged, and the discharge capacity at 1 st turn was recorded, after which the mixture was cycled at 1C/1C in a voltage interval of 3-4.4V. The calculation formula is as follows:
Cycle 500 retention rate (%) = (cycle 500 discharge capacity/cycle 1 discharge capacity) ×100%.
High-temperature storage at 60 ℃ for 7 days to generate gas rate: charging the battery at 25deg.C to 4.3V with constant current and constant voltage, charging at constant voltage of 4.3V with cutoff current of 0.005C, and recording initial volume V 1 After storage in an environment of 60 ℃ for 7 days, the volume V of the battery after storage is tested 2 The calculation formula of the gas production rate of the battery after the battery is stored at the high temperature of 60 ℃ for 7 days is as follows:
gas production rate= (V 2 -V 1 )/V 1 。
The test data are specifically shown in Table 2.
TABLE 2 data sheets for the performance of examples 1-19 and comparative examples 1-6
As can be seen from tables 1 and 2, the comparative example 1 has no compound represented by structural formulas 1 and 2, the battery cycle capacity retention rate is low, and the battery gas production rate is high; comparative example 2 and example 2, comparative example 3 and example 11, and the electrolyte in comparative examples 2 and 3 is added with the compound shown in the structural formula 1, but the battery has lower normal temperature cycle performance, higher internal resistance and high-temperature storage gas production rate; comparative example 4 compared with example 4, in comparative example 4, although the content of the compound represented by structural formula 1 was increased, the cycle performance of the battery was low and the gas production rate was high; through the comparison, it is hypothesized that the compound shown in the structural formula 1 is only added into the electrolyte, and the compound shown in the structural formula 1 can complex a small amount of free oxygen in the electrolyte, forms a film at the interface of the negative electrode, reduces the decomposition of the electrolyte, stabilizes the action of the electrolyte at high temperature, improves the high-temperature performance of the battery, and inhibits the high-temperature gas production of the electrolyte, but has larger internal resistance. Comparative example 5 and example 7, comparative example 6 and example 9, the electrolyte in comparative examples 5 to 6 only has the compound represented by structural formula 2, and comparative example 6 improves the mass content of the compound represented by structural formula 2 in the electrolyte, but the cycle performance of the battery is reduced and the gas production is increased; the electrolyte only contains the compound shown in the structural formula 2, so that the cycle performance of the battery cannot be improved, and the gas production rate of the battery can be reduced.
By comparing the comparative examples 1-6 with the examples 2, 11, 7 and 9, the electrolyte contains the compound shown in the structural formula 1 and the compound shown in the structural formula 2, the compound shown in the structural formula 1 can complex a small amount of free oxygen in the electrolyte, forms a film at a negative electrode interface, reduces electrolyte decomposition, stabilizes the electrolyte action at high temperature, improves the high-temperature performance of the battery, inhibits the high-temperature gas production of the electrolyte, but the compound shown in the structural formula 1 can cause the increase of the internal resistance of the battery when being decomposed at the positive electrode, and the compound shown in the structural formula 2 is added to cooperate with the compound shown in the structural formula 1, so that a silicon-oxygen bond in the compound shown in the structural formula 2 is unstable, is easy to break under the oxidation action of the positive electrode of the battery, combines with the compound shown in the structural formula 1 to form a complex, reduces the decomposition of the compound shown in the structural formula 1 at the positive electrode interface, further reduces the internal resistance of the battery, improves the cycle performance of the battery, reduces the gas production of the battery and improves the quick charge performance of the battery.
By comparing examples 1-10 with examples 16-19, the mass content a of the compound shown in the structural formula 1 in the electrolyte is between 0.1% and 5%, the mass content b of the compound shown in the structural formula 2 is between 0.1% and 5%, and the battery has high cycle capacity retention rate, low gas production rate and low internal resistance; the mass content a of the compound shown in the structural formula 1 is between 0.1 and 1 percent, the mass content b of the compound shown in the structural formula 2 is between 0.1 and 1 percent, and the battery cycle performance is good. In comparison with example 11 and example 2, the compound shown in structural formula 1 has the effects of improving the cycle performance of the battery, reducing the internal resistance of the battery and reducing the gas production rate of the battery.
In the embodiment 2 and the embodiment 12-15 contrast, the electrolyte is added with auxiliary additive Vinylene Carbonate (VC), in the VC content between 0.5-2%, the battery circulation capacity retention rate is high, the internal resistance of the battery becomes high, which means that the electrolyte is added with auxiliary additive, which can cooperate with the compound of the structural formula 1 and the structural formula 2 to improve the battery circulation performance, but the battery can increase the internal resistance of the battery; in example 15, the cycle performance of the battery was reduced, the internal resistance was higher, the gas production rate of the battery was reduced, indicating that the content of the auxiliary additive in the electrolyte was higher than 2%, the side reaction of the battery was increased, the cycle performance was reduced, and the internal resistance of the battery became higher.
Examples 20 to 29 and comparative examples 7 to 14
Examples 20-29 and comparative examples 7-14 are provided to illustrate the disclosed lithium ion batteries, including most of the operating steps of example 1, with the following differences: the pH value c of the positive electrode active material is different, the mass content a of the compound shown in the structural formula 1 added into the electrolyte is different, and the mass content b of the compound shown in the structural formula 2 added into the electrolyte is specifically shown in table 3.
Positive electrode active material pH test
The pH test of the positive electrode active material is according to GB/T9724-2007. 10g of the positive electrode active material of each of the examples and the comparative examples was added to 100mL of water at room temperature, stirred for 30min, left to stand for 90min, and filtered. The pH of the filtrates of all examples and all comparative examples were measured with a pH meter, respectively, to obtain the pH values of the respective corresponding positive electrode active materials.
The batteries of examples 20 to 29 and comparative examples 7 to 14 were tested according to the performance test method for batteries described above, and specific test structures are shown in table 4.
Table 3 battery parameter tables of examples 2, 7, 20-29 and comparative examples 7-14
Table 4 battery performance data tables for examples 2, 7, 20-29 and comparative examples 7-14
As is clear from tables 3 and 4, in the electrolyte of example 7 and comparative example 7-8, the mass content a of the compound represented by structural formula 1 in the electrolyte of comparative example 7-8 is not in the range of 0.1% -5%, the battery cycle capacity retention rate is low, the internal resistance is high, the gas yield is high, it is shown that the mass content a of the compound represented by structural formula 1 in the nonaqueous electrolyte is less than 0.1%, the additive addition amount is too small to function in the electrolyte, the mass content a of the compound represented by structural formula 1 in the nonaqueous electrolyte is more than 5%, the interface film thickness formed at the negative electrode interface is increased, and the decomposition at the positive electrode is increased, which results in an excessively large increase in the battery internal resistance, and the battery performance is deteriorated.
In example 7 and comparative examples 9 to 10, the mass content b of the compound shown in the structural formula 2 in the electrolyte of comparative examples 9 to 10 is not in the range of 0.1 to 5%, and the battery satisfies the relation 0.2 ++b) ×c ]/10 +.8, but the battery has low cycle capacity retention rate, high internal resistance and high gas production rate; the mass content b of the compound shown in the structural formula 2 in the nonaqueous electrolyte is less than 0.1%, the additive addition amount is too small to play a role in the electrolyte, and b is more than 5%, so that the chromaticity and acidity of the electrolyte are enhanced, the anode and cathode interface film is dissolved by the acid increase, the structural stability of the film is damaged, and the battery performance is reduced.
Example 2 is compared with comparative examples 11 to 12, the pH c of the positive electrode active material is not in the range of 6 to 9, although the battery satisfies the relation 0.2 [ (a+b) ×c ]/10 is less than or equal to 8, but the battery has low cycle capacity retention rate, high internal resistance and high gas production rate; the pH value of the positive electrode active material is less than 6, the high acidity has a dissolution effect on the battery interface film, the pH value of the positive electrode active material is more than 9, the alkalinity is strong, and when the battery is charged to a certain voltage, the electrolyte is decomposed to generate gas, so that the battery performance is reduced.
Example 20-example 29 in comparison with comparative examples 13-14, the mass content a of the compound represented by structural formula 1 in comparative examples 13-14 was in the range of 0.1% -5%, the mass content b of the compound represented by structural formula 2 was in the range of 0.1% -5%, and the pH value c of the positive electrode active material was in the range of 6-9, but the battery did not satisfy the relation 0.2 ++b) ×c ]/10 +.8, the battery had a low cycle capacity retention, high internal resistance, and high gas production rate; the value of a is 0.1-5, the value of b is 0.1-5, the value of c is 6-9, the battery also satisfies the relation 0.2-0 [ (a+b). Times.c ]/10-8, the three are cooperated, the limit of the pH value c of the positive electrode active material can avoid the decomposition of the compound shown in the structural formula 1 and the compound shown in the structural formula 2 in the electrolyte caused by the acidity or the alkalinity of the positive electrode active material, the functional exertion of the compound shown in the structural formula 1 and the compound shown in the structural formula 2 is not influenced, the compound shown in the structural formula 1 can complex a small amount of free oxygen in the electrolyte, the film is formed on the interface of the negative electrode, the decomposition of the electrolyte is reduced, the electrolyte is stabilized at high temperature, the high-temperature performance of the battery is improved, the high-temperature gas production of the electrolyte is inhibited, meanwhile, the silicon oxygen bond in the compound shown in the structural formula 2 in the electrolyte is unstable and is easy to break under the oxidation action of the positive electrode of the battery, the compound shown in the structural formula 2 is cooperated with the compound shown in the structural formula 1 to form a complex, the decomposition of the compound shown in the structural formula 1 at the positive electrode interface is reduced, the influence of the internal resistance increase brought by the compound shown in the structural formula 1 on the electrolyte can be just eliminated by the compound shown in the structural formula 2, the internal resistance of the battery is further reduced, and the performance of the battery is improved.
Examples 20 to 29 show that the mass content a of the compound shown in the structural formula 1 is in the range of 0.1% -5%, the mass content b of the compound shown in the structural formula 2 is in the range of 0.1% -5%, the pH value c of the positive electrode active material is in the range of 6-9, the relation [ (a+b) xc ]/10 is between 0.5 and 2, and the battery has lower internal resistance and better circulation capacity retention rate.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. A non-aqueous electrolyte, comprising an additive comprising a compound of structural formula 1 and structural formula 2:
wherein R is 1 、R 2 Each independently selected from the group consisting of an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an ether bond-containing alkyl group having 1 to 5 carbon atoms, and a sulfonylalkyl group having 1 to 5 carbon atoms;
R 3 、R 4 、R 5 each independently selected from a silane group having 1 to 5 carbon atoms, a silane group having 2 to 7 carbon atoms, and a fluorosilane group having 1 to 5 carbon atoms.
2. The nonaqueous electrolytic solution according to claim 1, wherein the mass content of the compound represented by structural formula 1 is in the range of 0.1% to 5% based on 100% by mass of the nonaqueous electrolytic solution;
The mass content of the compound shown in the structural formula 2 is 0.1-5% based on 100% of the mass of the nonaqueous electrolyte.
3. The nonaqueous electrolytic solution according to claim 1, wherein the mass content of the compound represented by structural formula 1 is in the range of 0.1% to 1% based on 100% by mass of the nonaqueous electrolytic solution;
the mass content of the compound shown in the structural formula 2 is in the range of 0.1% -1% based on 100% of the mass of the nonaqueous electrolyte.
4. The nonaqueous electrolytic solution according to claim 1, wherein the compound represented by structural formula 1 is selected from at least one of the following compounds:
the compound shown in the structural formula 2 is selected from the following compounds:
5. the nonaqueous electrolyte according to claim 1, further comprising a lithium salt, the lithium salt comprising LiBF 4 、LiPF 6 、LiAsF 6 、LiClO 4 、LiBOB、LiDFOB、LiFSI、LiTFSI、LiCH 3 SO 3 、LiPO 2 F 2 、LiSbF 6 、LiCF 3 SO 3 、LiC(SO 2 CF 3 ) 3 、LiN(SO 2 C 2 F 5 ) 2 、LiCl、LiBr、LiI、LiB 10 Cl 10 、LiAlCl 4 At least one of lithium chloroborane, lithium difluorodioxalate phosphate, lithium lower aliphatic carboxylate having 4 or less carbon atoms, lithium tetraphenylborate, and lithium iminoborate;
the molar concentration of the lithium salt is 0.5mol/L to 1.5mol/L.
6. The nonaqueous electrolytic solution according to claim 1, further comprising a nonaqueous organic solvent including at least one of cyclic carbonates, linear carbonates, carboxylic acid esters, sulfones, ethers, and nitriles;
The mass content of the solvent is 5-80% based on 100% of the total mass of the nonaqueous electrolyte.
7. The nonaqueous electrolytic solution according to claim 1, further comprising an auxiliary additive comprising at least one of a cyclic sulfate compound, a sultone compound, a cyclic carbonate compound, a phosphate compound, a borate compound, and a nitrile compound;
the mass content of the auxiliary additive is 0.01-10% based on 100% of the total mass of the nonaqueous electrolyte.
8.The nonaqueous electrolyte according to claim 7, wherein the cyclic sulfate compound is selected from the group consisting of vinyl sulfate, propylene sulfate, vinyl methyl sulfate, At least one of (a) and (b);
the sultone compound is at least one selected from 1, 3-propane sultone, 1, 4-butane sultone, 1, 3-propylene sultone and methyl disulfonic acid methylene ester;
the cyclic carbonate compound is at least one selected from ethylene carbonate, methylene ethylene carbonate, fluoroethylene carbonate, trifluoromethyl ethylene carbonate, bifluoroethylene carbonate and a compound shown in a structural formula 3:
In the structural formula 3, R 21 、R 22 、R 23 、R 24 、R 25 、R 26 Each independently selected from one of a hydrogen atom, a halogen atom, a C1-C5 group;
the phosphate compound is at least one selected from tri (trimethylsilane) phosphite ester or a compound shown in a structural formula 4:
in the structural formula 4, R 31 、R 32 、R 33 Each independently selected from the group consisting of C1-C5 saturated hydrocarbon groups, C1-C5 unsaturated hydrocarbon groups, C1-C5 halogenated hydrocarbon groups, and R 31 、R 32 、R 33 At least one of them is an unsaturated hydrocarbon group;
the borate compound is at least one selected from tri (triethylsilane) borate and tri (trimethylsilane) borate;
the nitrile compound is at least one selected from succinonitrile, glutaronitrile, ethylene glycol bis (propionitrile) ether, hexanedinitrile, adiponitrile, pimelic nitrile, suberonitrile, nonyldinitrile and decyldinitrile.
9. A lithium ion battery, characterized in that the lithium ion battery comprises a positive electrode and the nonaqueous electrolyte according to any one of claims 1 to 8, the positive electrode comprising a positive electrode active material,
the lithium ion battery satisfies the following relation:
0.2-8 [ (a+b) ×c ]/10-6-9;
wherein a is the mass content of the compound shown in the structural formula 1 in the nonaqueous electrolyte, and the unit is;
b is the mass content of the compound shown in the structural formula 2 in the nonaqueous electrolyte, and the unit is;
c is the pH value of the positive electrode active material.
10. The lithium ion battery of claim 9, wherein the lithium ion battery satisfies the following relationship: (a+b) c ]/10 is less than or equal to 0.5 and less than or equal to 2;
the pH value c of the positive electrode active material is 7-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310767864.5A CN116826170A (en) | 2023-06-27 | 2023-06-27 | Nonaqueous electrolyte and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310767864.5A CN116826170A (en) | 2023-06-27 | 2023-06-27 | Nonaqueous electrolyte and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116826170A true CN116826170A (en) | 2023-09-29 |
Family
ID=88114091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310767864.5A Pending CN116826170A (en) | 2023-06-27 | 2023-06-27 | Nonaqueous electrolyte and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116826170A (en) |
-
2023
- 2023-06-27 CN CN202310767864.5A patent/CN116826170A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114464887B (en) | Secondary battery | |
| CN114497692B (en) | Secondary battery | |
| CN111600074B (en) | High-voltage lithium ion battery electrolyte and high-voltage lithium ion battery | |
| CN115117452B (en) | Lithium ion battery | |
| CN115189029B (en) | Lithium ion battery | |
| WO2023246279A1 (en) | Lithium secondary battery | |
| CN114725512A (en) | Non-aqueous electrolyte and secondary battery | |
| CN117117324A (en) | Lithium ion battery | |
| CN115020813A (en) | Lithium ion battery | |
| CN116435595A (en) | Lithium ion battery | |
| CN114361588B (en) | Lithium ion battery | |
| CN116315090A (en) | Lithium ion battery | |
| WO2023104038A1 (en) | Secondary battery | |
| EP4369455A1 (en) | Non-aqueous electrolyte and battery | |
| CN115911515A (en) | Non-aqueous electrolyte and battery | |
| CN113130999A (en) | Lithium ion battery electrolyte and lithium ion battery | |
| CN116826170A (en) | Nonaqueous electrolyte and lithium ion battery | |
| CN115663286B (en) | Lithium ion battery | |
| CN117175015B (en) | Nonaqueous electrolyte and battery | |
| CN114883519B (en) | Positive plate and lithium ion battery | |
| CN117650276A (en) | Nonaqueous electrolyte and lithium ion battery | |
| CN117477027A (en) | Nonaqueous electrolyte and secondary battery | |
| EP4376150A1 (en) | Non-aqueous electrolyte and lithium-ion battery | |
| CN117790905A (en) | Lithium ion battery | |
| CN116190788A (en) | Nonaqueous electrolyte and lithium ion battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |