CN115911563A - Electrolyte capable of improving storage performance of battery and battery comprising electrolyte - Google Patents
Electrolyte capable of improving storage performance of battery and battery comprising electrolyte Download PDFInfo
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- CN115911563A CN115911563A CN202310015990.5A CN202310015990A CN115911563A CN 115911563 A CN115911563 A CN 115911563A CN 202310015990 A CN202310015990 A CN 202310015990A CN 115911563 A CN115911563 A CN 115911563A
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 54
- 238000003860 storage Methods 0.000 title abstract description 30
- -1 fluoro-thiophene sulfonamide compound Chemical class 0.000 claims abstract description 32
- 239000000126 substance Substances 0.000 claims abstract description 13
- 229940124530 sulfonamide Drugs 0.000 claims abstract description 12
- 125000005587 carbonate group Chemical group 0.000 claims abstract description 3
- 125000001153 fluoro group Chemical group F* 0.000 claims description 40
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 28
- 229910001416 lithium ion Inorganic materials 0.000 claims description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 21
- 239000011737 fluorine Chemical group 0.000 claims description 20
- 229910052731 fluorine Inorganic materials 0.000 claims description 20
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 19
- 229910052744 lithium Inorganic materials 0.000 claims description 19
- 239000001257 hydrogen Substances 0.000 claims description 18
- 229910052739 hydrogen Inorganic materials 0.000 claims description 18
- 150000001875 compounds Chemical class 0.000 claims description 17
- 239000007773 negative electrode material Substances 0.000 claims description 16
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 13
- 125000000217 alkyl group Chemical group 0.000 claims description 12
- 150000002431 hydrogen Chemical group 0.000 claims description 12
- 239000007774 positive electrode material Substances 0.000 claims description 12
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 claims description 8
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical group C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 claims description 6
- 125000005108 alkenylthio group Chemical group 0.000 claims description 6
- 125000003545 alkoxy group Chemical group 0.000 claims description 6
- 125000003342 alkenyl group Chemical group 0.000 claims description 5
- 125000003302 alkenyloxy group Chemical group 0.000 claims description 5
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 125000000565 sulfonamide group Chemical group 0.000 claims description 5
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 125000004414 alkyl thio group Chemical group 0.000 claims description 4
- DKPFZGUDAPQIHT-UHFFFAOYSA-N butyl acetate Chemical compound CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 150000001733 carboxylic acid esters Chemical class 0.000 claims description 4
- OBNCKNCVKJNDBV-UHFFFAOYSA-N ethyl butyrate Chemical compound CCCC(=O)OCC OBNCKNCVKJNDBV-UHFFFAOYSA-N 0.000 claims description 4
- 239000013538 functional additive Substances 0.000 claims description 4
- MLFHJEHSLIIPHL-UHFFFAOYSA-N isoamyl acetate Chemical compound CC(C)CCOC(C)=O MLFHJEHSLIIPHL-UHFFFAOYSA-N 0.000 claims description 4
- 229910001947 lithium oxide Inorganic materials 0.000 claims description 4
- 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 4
- IGILRSKEFZLPKG-UHFFFAOYSA-M lithium;difluorophosphinate Chemical compound [Li+].[O-]P(F)(F)=O IGILRSKEFZLPKG-UHFFFAOYSA-M 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- PGMYKACGEOXYJE-UHFFFAOYSA-N pentyl acetate Chemical compound CCCCCOC(C)=O PGMYKACGEOXYJE-UHFFFAOYSA-N 0.000 claims description 4
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 229910052723 transition metal Inorganic materials 0.000 claims description 4
- 229910013872 LiPF Inorganic materials 0.000 claims description 3
- 101150058243 Lipf gene Proteins 0.000 claims description 3
- 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 claims description 2
- JGFBQFKZKSSODQ-UHFFFAOYSA-N Isothiocyanatocyclopropane Chemical compound S=C=NC1CC1 JGFBQFKZKSSODQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910018040 Li 1+x Ni Inorganic materials 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 2
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 claims description 2
- 229910021383 artificial graphite Inorganic materials 0.000 claims description 2
- PWLNAUNEAKQYLH-UHFFFAOYSA-N butyric acid octyl ester Natural products CCCCCCCCOC(=O)CCC PWLNAUNEAKQYLH-UHFFFAOYSA-N 0.000 claims description 2
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 2
- 229910021385 hard carbon Inorganic materials 0.000 claims description 2
- GJRQTCIYDGXPES-UHFFFAOYSA-N iso-butyl acetate Natural products CC(C)COC(C)=O GJRQTCIYDGXPES-UHFFFAOYSA-N 0.000 claims description 2
- 229940117955 isoamyl acetate Drugs 0.000 claims description 2
- FGKJLKRYENPLQH-UHFFFAOYSA-M isocaproate Chemical compound CC(C)CCC([O-])=O FGKJLKRYENPLQH-UHFFFAOYSA-M 0.000 claims description 2
- OQAGVSWESNCJJT-UHFFFAOYSA-N isovaleric acid methyl ester Natural products COC(=O)CC(C)C OQAGVSWESNCJJT-UHFFFAOYSA-N 0.000 claims description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 2
- 229910003002 lithium salt Inorganic materials 0.000 claims description 2
- 159000000002 lithium salts Chemical class 0.000 claims description 2
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 claims description 2
- ACFSQHQYDZIPRL-UHFFFAOYSA-N lithium;bis(1,1,2,2,2-pentafluoroethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)C(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)C(F)(F)F ACFSQHQYDZIPRL-UHFFFAOYSA-N 0.000 claims description 2
- QVXQYMZVJNYDNG-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)methylsulfonyl-trifluoromethane Chemical compound [Li+].FC(F)(F)S(=O)(=O)[C-](S(=O)(=O)C(F)(F)F)S(=O)(=O)C(F)(F)F QVXQYMZVJNYDNG-UHFFFAOYSA-N 0.000 claims description 2
- 239000002931 mesocarbon microbead Substances 0.000 claims description 2
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 claims description 2
- UUIQMZJEGPQKFD-UHFFFAOYSA-N n-butyric acid methyl ester Natural products CCCC(=O)OC UUIQMZJEGPQKFD-UHFFFAOYSA-N 0.000 claims description 2
- 229910021382 natural graphite Inorganic materials 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 229940090181 propyl acetate Drugs 0.000 claims description 2
- 229910021384 soft carbon Inorganic materials 0.000 claims description 2
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims 1
- LMBFAGIMSUYTBN-MPZNNTNKSA-N teixobactin Chemical compound C([C@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H](CCC(N)=O)C(=O)N[C@H]([C@@H](C)CC)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H]1C(N[C@@H](C)C(=O)N[C@@H](C[C@@H]2NC(=N)NC2)C(=O)N[C@H](C(=O)O[C@H]1C)[C@@H](C)CC)=O)NC)C1=CC=CC=C1 LMBFAGIMSUYTBN-MPZNNTNKSA-N 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 7
- 239000001569 carbon dioxide Substances 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 230000004888 barrier function Effects 0.000 abstract description 4
- KTFDYVNEGTXQCV-UHFFFAOYSA-N 2-Thiophenesulfonamide Chemical group NS(=O)(=O)C1=CC=CS1 KTFDYVNEGTXQCV-UHFFFAOYSA-N 0.000 abstract description 2
- 125000004432 carbon atom Chemical group C* 0.000 abstract description 2
- 230000003993 interaction Effects 0.000 abstract description 2
- 229910002804 graphite Inorganic materials 0.000 description 11
- 239000010439 graphite Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000001556 precipitation Methods 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 7
- 239000006258 conductive agent Substances 0.000 description 7
- 239000010405 anode material Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000007795 chemical reaction product Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 3
- 229910013870 LiPF 6 Inorganic materials 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000002041 carbon nanotube Substances 0.000 description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 description 3
- 229940126214 compound 3 Drugs 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 229910012820 LiCoO Inorganic materials 0.000 description 2
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 2
- 239000006183 anode active material Substances 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical group 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229940125782 compound 2 Drugs 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000002109 single walled nanotube Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 125000004455 (C1-C3) alkylthio group Chemical group 0.000 description 1
- 125000006700 (C1-C6) alkylthio group Chemical group 0.000 description 1
- 125000000882 C2-C6 alkenyl group Chemical group 0.000 description 1
- 125000003320 C2-C6 alkenyloxy group Chemical group 0.000 description 1
- 229910010710 LiFePO Inorganic materials 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229940125904 compound 1 Drugs 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- YNQRWVCLAIUHHI-UHFFFAOYSA-L dilithium;oxalate Chemical compound [Li+].[Li+].[O-]C(=O)C([O-])=O YNQRWVCLAIUHHI-UHFFFAOYSA-L 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- XKPJKVVZOOEMPK-UHFFFAOYSA-M lithium;formate Chemical compound [Li+].[O-]C=O XKPJKVVZOOEMPK-UHFFFAOYSA-M 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 229910001428 transition metal ion Inorganic materials 0.000 description 1
- 238000009461 vacuum packaging Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides an electrolyte capable of improving the storage performance of a battery and a battery comprising the electrolyte. The electrolyte comprises a fluoro-thiophene sulfonamide compound, when the battery is charged and discharged, the electrolyte is oxidized when the anode is at a high potential, the fluoro-thiophene sulfonamide compound contains C-F bonds, and C atoms lose electrons to form C due to easy breakage of the C-F bonds + Since the energy barrier is lowered, the fluorothiophene sulfonamide compound can preferentially electrochemically react with EC on the positive electrode, thereby forming an interface CEI film on the positive electrode. The interface CEI film can simultaneously contain carbonate groups and thiophene sulfonamide groups, the energy barrier is increased, electrons are difficult to lose, the structure of the interface CEI film is stable, the molecular weight is high, the surface of the anode is more compact, the generation of carbon dioxide is inhibited, the interaction between the anode and the cathode is reduced, and the chemical self-discharge of the battery in the storage process is improvedA phenomenon.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to electrolyte capable of improving storage performance of a battery and the battery comprising the electrolyte.
Background
The storage performance of the battery is that after the battery is charged to a certain State of Charge (State of Charge) and stored for a certain Time (Time) at a certain Temperature (Temperature), the internal resistance, the discharge capacity, the rate capability, the cycle performance and the like of the battery are changed. For the storage performance degradation mechanism of the lithium ion battery, according to experimental research performed by scholars at home and abroad, the storage performance degradation is generally considered to be mainly manifested as over-large self-discharge, wherein chemical self-discharge is particularly serious. The phenomenon that the amount of stored electricity is spontaneously consumed when the battery is in an open state is referred to as self-discharge of the battery. Chemical self-discharge is a phenomenon of voltage drop and capacity decay caused by spontaneous chemical reaction inside a battery; when chemical self-discharge occurs, no current is formed between the positive electrode and the negative electrode, but a series of complex chemical reactions occur between the positive electrode and the negative electrode of the battery and the electrolyte, so that the positive electrode is consumed and the battery capacity is reduced.
The storage performance of a lithium ion battery is an important performance index because in practical application of the lithium ion battery, the lithium ion battery cannot be in a working state all the time, on one hand, the battery is bound to pass through a long period from the finished product shipment to the client, and on the other hand, the lithium ion battery is expressed in special application occasions, such as medical equipment, military equipment, standby batteries, mobile power supplies and other application fields. Problems caused by excessive self-discharge, such as the car cannot be started after being stopped for too long; or the voltage of the battery before warehousing is normal, and low voltage or even zero voltage is found when the battery is delivered; even in summer, the vehicle-mounted GPS is placed on the vehicle, and the electricity consumption or the use time is obviously insufficient after a period of time. In the storage process of the lithium ion battery, particularly in a high-temperature environment, the battery system is in a thermodynamically unstable state under a full charge state, and a process of changing to an equilibrium state can be continuously generated, so that the anode material is in a delithiation state, the valence state of transition metal ions is increased, the oxidizability is enhanced, and the electrolyte is more easily oxidized. The negative electrode graphite is in a lithium intercalation state, has poor stability and is easy to react with electrolyte, and when the change is accumulated to a certain degree, the change of the voltage and the internal resistance of the lithium ion battery can be caused, and the multiplying power performance and the safety characteristic of the battery can be influenced. Therefore, the storage performance-self-discharge degree of the lithium ion battery under certain environment is very important, and even becomes one of the key factors restricting the use of the battery.
Most of the conventional electrolytes are ethylene carbonate-based electrolytes, and during storage, the electrolyte is oxidized at the positive electrode side, and the product is gas (a large amount of CO) 2 ) And oxidized substance and e - . Gas products (large amounts of CO) due to electric field and diffusion 2 ) Reduced by the electrolyte reaching the negative electrode, thickening the SEI film of the negative electrode, resulting in partial blockage of the path for lithium ions to intercalate into graphite, wherein CO 2 With intercalated Li + The following reaction takes place to make CO 2 Almost completely consumed by lithiated graphite; meanwhile, lithium oxalate and lithium formate generated on the negative electrode side can diffuse back to the positive electrode and are oxidized into CO again 2 ，Li + Reinserting into the positive electrode causes chemical self-discharge (reversible loss), so that the oxidation of the electrolyte on the positive electrode side to produce CO is suppressed 2 The chemical self-discharge path is cut off from the source, and the chemical self-discharge of high-temperature storage can be effectively reduced.
Disclosure of Invention
In order to solve the problems that chemical self-discharge of the battery is increased and the rate capability and the safety performance of the battery are reduced due to the fact that a large amount of carbon dioxide is generated by oxidation of the electrolyte in the storage process of the battery, the electrolyte comprises a fluorothiophene sulfonamide compound, and the fluorothiophene sulfonamide compound is used to effectively improve the oxidation resistance of the electrolyte in a voltage system, avoid the oxidation of the fluorothiophene sulfonamide compound to generate the carbon dioxide, remarkably reduce the chemical self-discharge of the battery and improve the rate capability and the safety performance of the battery.
The purpose of the invention is realized by the following technical scheme:
an electrolyte comprises an organic solvent, an electrolyte salt and a functional additive, wherein the functional additive is selected from a fluoro thiophene sulfonamide compound.
According to an embodiment of the invention, said fluorothiophenesulfonamide compound is a compound containing at least one thiophene group
And sulfonamide group (-SO) 2 -NH 2 ) The thiophene group of (a), said thiophene group being directly attached to a sulfonamide group.
According to an embodiment of the present invention, the fluorothiophene sulfonamide compound is at least one selected from the group consisting of a compound represented by formula I, a compound represented by formula II, and a compound represented by formula III:
wherein R is 1 、R 2 、R 3 、R 4 、R 5 、R 6 、R 7 The same or different, independently from each other, are selected from the group consisting of hydrogen, fluorine substituted or unsubstituted alkyl, fluorine substituted or unsubstituted alkenyl, fluorine substituted or unsubstituted alkoxy, fluorine substituted or unsubstituted alkenyloxy, fluorine substituted or unsubstituted alkylthio, fluorine substituted or unsubstituted alkenylthio, -NR 8 R 9 ；R 8 、R 9 Identical or different, independently of one another, from hydrogen, fluorine-substituted or unsubstituted alkyl, and at least one radical is not hydrogen.
According to an embodiment of the invention, R 1 、R 2 、R 3 、R 4 、R 5 、R 6 、R 7 Identical or different, independently of one another, from hydrogen, fluorine substituted or unsubstituted C 1-12 Alkyl, fluoro substituted or unsubstituted C 2-12 Alkenyl, fluoro substituted or unsubstituted C 1-12 Alkoxy, fluoro substituted or unsubstituted C 2-12 Alkenyloxy, fluoro substituted or unsubstituted C 1-12 Alkylthio, fluoro substituted or unsubstituted C 2-12 Alkenylthio, -NR 8 R 9 ；R 8 、R 9 Identical or different, independently of one another, from hydrogen, fluorine substituted or unsubstituted C 1-12 An alkyl group, and at least one group is not hydrogen.
According to an embodiment of the present invention, R 1 、R 2 、R 3 、R 4 、R 5 、R 6 、R 7 Identical or different, independently of one another, from hydrogen, fluorine substituted or unsubstituted C 1-6 Alkyl, fluoro substituted or unsubstituted C 2-6 Alkenyl, fluoro substituted or unsubstituted C 1-6 Alkoxy, fluoro substituted or unsubstituted C 2-6 Alkenyloxy, fluoro substituted or unsubstituted C 1-6 Alkylthio, fluoro substituted or unsubstituted C 2-6 Alkenylthio, -NR 8 R 9 ；R 8 、R 9 Identical or different, independently of one another, from hydrogen, fluorine substituted or unsubstituted C 1-6 An alkyl group, and at least one group is not hydrogen.
According to an embodiment of the invention, R 1 、R 2 、R 3 、R 4 、R 5 、R 6 、R 7 Identical or different, independently of one another, from hydrogen, fluorine substituted or unsubstituted C 1-3 Alkyl, fluoro substituted or unsubstituted C 2-3 Alkenyl, fluoro substituted or unsubstituted C 1-3 Alkoxy, fluoro substituted or unsubstituted C 2-3 Alkenyloxy, fluoro substituted or unsubstituted C 1-3 Alkylthio, fluoro substituted or unsubstituted C 2-3 Alkenylthio, -NR 8 R 9 ；R 8 、R 9 Identical or different, independently of one another, from hydrogen, fluorine substituted or unsubstituted C 1-3 An alkyl group, and at least one group is not hydrogen.
According to an embodiment of the present invention, the fluorothiophene sulfonamide compound is at least one compound selected from the group consisting of compounds 1 to 4:
according to an embodiment of the present invention, the weight of the fluoro thiophene sulfonamide compound is 0.1wt% to 10wt% of the total weight of the electrolyte, for example, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1wt%, 1.2wt%, 1.4wt%, 1.5wt%, 1.6wt%, 1.8wt%, 2wt%, 2.5wt%, 2.6wt%, 2.8wt%, 3wt%, 3.4wt%, 3.7wt%, 3.9wt%, 4wt%, 4.5wt%, 5wt%, 5.5wt%, 6wt%, 6.5wt%, 7wt%, 8wt%, 9wt%, or 10wt%.
According to an embodiment of the present invention, the fluorothiophene sulfonamide compound is prepared by a method known in the art, or is obtained after being purchased commercially.
According to an embodiment of the present invention, the electrolyte salt is selected from electrolyte lithium salts selected from lithium hexafluorophosphate (LiPF) 6 ) Lithium difluorophosphate (LiPO) 2 F 2 ) One or more of lithium difluorooxalato borate (LiDFOB), lithium difluorosulfonimide (LiTFSI), lithium bistrifluoromethylsulfonimide, lithium difluorobis-oxalato phosphate, lithium tetrafluoroborate, lithium bisoxalato borate, lithium hexafluoroantimonate, lithium hexafluoroarsenate, lithium bis (trifluoromethylsulfonyl) imide, lithium bis (pentafluoroethylsulfonyl) imide, lithium tris (trifluoromethylsulfonyl) methide, or lithium bis (trifluoromethylsulfonyl) imide.
According to an embodiment of the present invention, the weight of the electrolyte salt is 10wt% to 15wt%, for example, 10wt%, 11wt%, 12wt%, 13wt%, 14wt% or 15wt% of the total weight of the electrolyte.
According to an embodiment of the invention, the organic solvent is selected from carbonates and/or carboxylic esters, the carbonates being selected from at least one of the following fluorinated or unsubstituted solvents: ethylene Carbonate (EC), propylene Carbonate (PC), dimethyl carbonate, diethyl carbonate (DEC), ethyl methyl carbonate; the carboxylic acid ester is at least one of the following fluorinated or unsubstituted solvents: propyl acetate, n-butyl acetate, isobutyl acetate, n-pentyl acetate, isoamyl acetate, propyl Propionate (PP), ethyl Propionate (EP), methyl butyrate, ethyl n-butyrate.
According to an embodiment of the invention, the electrolyte is used in a lithium ion battery.
The invention also provides a battery, which comprises the electrolyte.
According to an embodiment of the present invention, the lithium ion battery further includes a positive electrode sheet containing a positive electrode active material, a negative electrode sheet containing a negative electrode active material, and a separator.
According to an embodiment of the present invention, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on one or both surfaces of the positive electrode current collector, and the positive electrode active material layer includes a positive electrode active material, a conductive agent, and a binder.
According to an embodiment of the present invention, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer coated on one or both surfaces of the negative electrode current collector, the negative electrode active material layer including a negative electrode active material, a conductive agent, and a binder.
According to the embodiment of the invention, the positive electrode active material layer comprises the following components in percentage by mass: 80-99.8 wt% of positive active material, 0.1-10 wt% of conductive agent and 0.1-10 wt% of binder.
Preferably, the positive electrode active material layer comprises the following components in percentage by mass: 90-99.6 wt% of positive active material, 0.2-5 wt% of conductive agent and 0.2-5 wt% of binder.
According to the embodiment of the invention, the anode active material layer comprises the following components in percentage by mass: 80-99.8 wt% of negative active material, 0.1-10 wt% of conductive agent and 0.1-10 wt% of binder.
Preferably, the negative electrode active material layer comprises the following components in percentage by mass: 90-99.6 wt% of negative active material, 0.2-5 wt% of conductive agent and 0.2-5 wt% of binder.
According to an embodiment of the present invention, the conductive agent is at least one selected from the group consisting of conductive carbon black, acetylene black, ketjen black, conductive graphite, conductive carbon fiber, carbon nanotube, metal powder, and carbon fiber.
According to an embodiment of the present invention, the binder is selected from at least one of sodium carboxymethylcellulose, styrene-butadiene latex, polytetrafluoroethylene, polyethylene oxide.
According to an embodiment of the present invention, the anode active material includes a carbon-based anode material and/or a silicon-based anode material.
According to an embodiment of the present invention, the carbon-based negative electrode material is selected from at least one of artificial graphite, natural graphite, mesocarbon microbeads, hard carbon and soft carbon.
According to an embodiment of the present invention, the silicon-based anode material is selected from at least one of silicon-oxygen anode material or silicon-carbon anode material, such as Si, siC, siOx (0-x-2).
According to an embodiment of the present invention, the positive electrode active material is selected from at least one of transition metal lithium oxide, lithium iron phosphate, and lithium manganate; the chemical formula of the transition metal lithium oxide is Li 1+x Ni y Co z M (1 -y-z)O 2 Wherein x is more than or equal to-0.1 and less than or equal to 1; y is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, and y + z is more than or equal to 0 and less than or equal to 1; wherein M is at least one of Mg, zn, ga, ba, al, fe, cr, sn, V, mn, sc, ti, nb, mo and Zr.
The invention has the beneficial effects that:
the invention provides an electrolyte capable of improving the storage performance of a battery and a battery comprising the electrolyte. The electrolyte comprises a fluoro thiophene sulfonamide compound, when the battery is charged and discharged, the electrolyte is oxidized when the anode is at a high potential, the fluoro thiophene sulfonamide compound contains C-F bonds, and C atoms lose electrons to form C due to easy breakage of the C-F bonds + Since the energy barrier is lowered, the fluorothiophene sulfonamide compound can preferentially electrochemically react with EC on the positive electrode to form an interfacial CEI film on the positive electrode. Because the interface CEI film can simultaneously contain carbonate groups and thiophene sulfonamide groups, the energy barrier is raised, and electrons are extremely difficult to lose, the interface CEThe I film has stable structure and high molecular weight, so that the surface of the anode is more compact, and EC and LiPF in the electrolyte can be prevented 6 The components are further subjected to violent oxidative decomposition on the positive electrode side, so that the integrity of the electrode is maintained, and the generation of carbon dioxide is also inhibited, thereby reducing the interaction of the positive electrode and the negative electrode and improving the chemical self-discharge phenomenon of the battery in the storage process. Meanwhile, the problem of lithium precipitation does not occur in the battery after high-temperature storage and high-temperature circulation for 500 weeks, and the safety performance of the battery is greatly improved.
Taking the fluorothiophene sulfonamide compound shown in formula 1 as an example, the oxidation process is as follows:
drawings
Fig. 1 is a graph showing the results of storage property tests of the batteries of example 1 of the present invention and comparative example 1 after 35 days of storage at 60 ℃.
Fig. 2 is a result of a storage performance test of the batteries of example 2 of the present invention and comparative example 2 after 35 days of storage at 60 ℃.
Fig. 3 is a result of a storage performance test of the batteries of example 3 of the present invention and comparative example 3 after 35 days of storage at 60 ℃.
Fig. 4 is an optical view of the negative electrode sheets obtained after the batteries of examples 1 to 3 of the present invention and comparative examples 1 to 3 were stored at 60 c for 35 days, cycled at 45 c for 500 weeks, and disassembled.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the techniques realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
The lithium ion battery is prepared by the following steps:
1) Preparation of positive plate
Positive electrode active material (LiCoO) 2 NCM811 or LiFePO 4 ) Mixing polyvinylidene fluoride (PVDF), SP (super P) and Carbon Nano Tubes (CNT) according to a mass ratio of 96; uniformly coating the positive active slurry on two surfaces of the aluminum foil; and drying the coated aluminum foil, and then rolling and slitting to obtain the required positive plate.
2) Preparation of negative plate
Mixing a negative electrode active substance (graphite), sodium carboxymethylcellulose (CMC-Na), styrene butadiene rubber, conductive carbon black (SP) and single-walled carbon nanotubes (SWCNTs) according to a mass ratio of 94.5; uniformly coating the negative active slurry on two surfaces of a copper foil; and (3) airing the coated copper foil at room temperature, then transferring the copper foil to an oven at 80 ℃ for drying for 10h, and then carrying out cold pressing and slitting to obtain the negative plate.
Stacking the positive plate in the step 1), the negative plate in the step 2) and the diaphragm according to the order of the positive plate, the diaphragm and the negative plate, and then winding to obtain a battery cell; placing the battery cell in an aluminum foil package, injecting the electrolyte in the step 3) into the package, and performing vacuum packaging, standing, formation, shaping, sorting and other processes to obtain the lithium ion battery.
And (4) performance testing:
1) Testing the gas production component and content of the positive plate after being stored for 35 days at 60 DEG C
Charging the battery (charging to 4.48V according to 0.7C, then charging to cutoff current of 0.05C at constant voltage of 4.48V) to full charge, transferring the battery into a glove box, cutting the battery, obtaining a positive plate, resealing the positive plate under vacuum, storing the resealed positive plate at 60 ℃ for 35 days, and testing the gas production component and content of the positive plate at 60 ℃ for 35 days by using a drainage method and a Gas Chromatograph (GC).
2) The residual capacity and recovery capacity of a fully charged battery after 35 days of storage at 60 ℃ were tested
(a) At 25 ℃, the battery was charged to 4.48V at 0.7C, further charged to a cut-off current of 0.05C at a constant voltage of 4.48V, and then discharged to 3.0V with a constant current of 0.5C, at which point the discharge capacity was the initial capacity. (b) Then charging to 4.48V according to 0.7C, further charging to 0.05C of cut-off current at constant voltage of 4.48V, after the battery is fully charged, placing the battery in an environment of 60 ℃ for storage for 35 days, and then discharging to 3.0V by using a constant current of 0.5C, wherein the discharge capacity at this time is the residual capacity. (c) The battery is charged to 4.48V according to 0.7C, then charged to the cut-off current of 0.05C at a constant voltage of 4.48V, and then discharged to 3.0V at a constant current of 0.04C, and the discharge capacity at this time is the recovery capacity. The percentage of the self-discharge capacity is the difference between the initial capacity and the residual capacity.
The method for testing the residual capacity and the recovery capacity of the battery after storage comprises the following steps: the initial capacity of the battery is the discharge capacity of the battery before storage.
3) And (3) standing the battery stored at 60 ℃ for 35 days at 45 ℃ for 2-3 hours, after the temperature of the battery body reaches 45 ℃, charging the battery to 4.48V according to 0.7C, then charging to a cut-off current of 0.05C at a constant voltage of 4.48V, then discharging to 3.0V with a constant current of 0.5C, circulating for 500 weeks according to the charging and discharging system, disassembling the battery, and observing the lithium precipitation condition of the negative plate.
Example 1
In an inert atmosphere, adding 1mol/L LiPF 6 To the DEC/EC/EMC/(diethyl carbonate/ethylene carbonate/ethyl methyl carbonate) (v = 2. Matched with LiCoO 2 And assembling the positive plate/the graphite negative plate and the PE diaphragm into the lithium ion battery.
Comparative example 1
The procedure for the preparation of a lithium ion battery is the same as in example 1, except that compound 1 is not added.
From the results of fig. 1 and 4, it can be seen that the electrolyte solution using the additive of the present invention was used for LiCoO 2 LiCoO can be remarkably inhibited when used in graphite lithium ion battery 2 The generation of carbon dioxide on the positive electrode side electrode reduces the self-discharge of the lithium ion battery and prolongs the service life of the lithium ion batteryThe storage life of the battery is prolonged, local lithium precipitation can be avoided, and the safety performance of the battery is improved.
After the battery of comparative example 1 is stored for a period of time, self-discharge becomes large, chemical reaction in the battery is severe, reaction products are deposited on the surface of an electrode, the rate performance of the battery is affected, the rate performance of the battery is poor, local lithium precipitation is easy to occur, and after the reaction products are accumulated to a certain degree, a diaphragm can be pierced, the internal short circuit of the battery is caused, and the safety performance is affected.
Example 2
In an inert atmosphere, adding 1mol/L LiPF 6 The EC/EMC (ethylene carbonate/ethyl methyl carbonate) (v = 3) electrolyte of (1) was added with compound 2 in an amount of 8% of the total mass of the electrolyte and mixed to prepare an electrolyte. And the lithium ion battery is assembled by matching with a nickel-cobalt-manganese ternary (NCM 811) positive plate/graphite negative plate and a PP/PE/PP diaphragm.
Comparative example 2
The lithium ion battery was prepared as in example 2 except that compound 2 was not added.
From the results of fig. 2 and fig. 4, it can be seen that the electrolyte using the additive of the present invention can significantly suppress the generation of carbon dioxide on the positive electrode side of the nickel-cobalt-manganese ternary (NCM 811) positive plate/graphite negative electrode lithium ion battery, reduce the self-discharge of the lithium ion battery, prolong the storage life of the battery, and simultaneously avoid the occurrence of local lithium precipitation, thereby improving the safety performance of the battery.
The battery of comparative example 2, however, has a large self-discharge after being stored for a certain period of time, and a chemical reaction occurs inside the battery violently, and a reaction product deposits on the surface of an electrode, thereby affecting the rate performance of the battery, causing the rate performance of the battery to be poor, and causing local lithium precipitation.
Example 3
In an inert atmosphere, adding 1mol/L LiPF 6 The EC/EMC (ethylene carbonate/ethyl methyl carbonate) (v = 3) electrolyte of (1) was added with compound 3 and compound 4 (the mass ratio of compound 3 and compound 4 was 3And mixing to obtain the electrolyte. Matched with LiFePO 4 And assembling the positive plate/the graphite negative plate and the PE diaphragm into the lithium ion battery.
Comparative example 3
The lithium ion battery was prepared as in example 1, except that compound 3 and compound 4 were not added.
From the results of fig. 3 and 4, it can be seen that the electrolyte solution using the additive of the present invention was used for LiFePO 4 LiFePO can be remarkably inhibited in the lithium ion battery with the positive plate/the graphite negative plate 4 The generation of carbon dioxide on the positive electrode side electrode reduces the self-discharge of the lithium ion battery, prolongs the storage life of the battery, and simultaneously can avoid local lithium precipitation and improve the safety performance of the battery.
After the battery of the comparative example 3 is stored for a period of time, self-discharge becomes large, chemical reaction in the battery is severe, reaction products are deposited on the surface of an electrode, the rate performance of the battery is affected, the rate performance of the battery is poor, local lithium precipitation is easy to occur, and after the reaction products are accumulated to a certain degree, a diaphragm can be pierced, the internal short circuit of the battery is caused, and the safety performance is affected.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The electrolyte is characterized by comprising an organic solvent, an electrolyte salt and a functional additive, wherein the functional additive is selected from a fluorothiophene sulfonamide compound.
2. The electrolyte according to claim 1, wherein the fluorothiophenesulfonamide compound is a fluorine-substituted compound containing at least one thiophene group and a sulfonamide group, the thiophene group being directly linked to the sulfonamide group.
3. The electrolyte according to claim 1 or 2, wherein the fluorinated thiophene sulfonamide compound is at least one compound selected from the group consisting of a compound of formula I, a compound of formula II, and a compound of formula III:
wherein R is 1 、R 2 、R 3 、R 4 、R 5 、R 6 、R 7 The same or different, independently from each other, are selected from the group consisting of hydrogen, fluorine substituted or unsubstituted alkyl, fluorine substituted or unsubstituted alkenyl, fluorine substituted or unsubstituted alkoxy, fluorine substituted or unsubstituted alkenyloxy, fluorine substituted or unsubstituted alkylthio, fluorine substituted or unsubstituted alkenylthio, -NR 8 R 9 ；R 8 、R 9 Identical or different, independently of one another, from hydrogen, fluorine-substituted or unsubstituted alkyl, and at least one radical is not hydrogen.
4. The electrolyte of claim 3, wherein R is 1 、R 2 、R 3 、R 4 、R 5 、R 6 、R 7 Identical or different, independently of one another, from hydrogen, fluorine substituted or unsubstituted C 1-12 Alkyl, fluoro substituted or unsubstituted C 2-12 Alkenyl, fluoro substituted or unsubstituted C 1-12 Alkoxy, fluoro substituted or unsubstituted C 2-12 Alkenyloxy, fluoro substituted or unsubstituted C 1-12 Alkylthio, fluoro substituted or unsubstituted C 2-12 Alkenylthio, -NR 8 R 9 ；R 8 、R 9 Identical or different, independently of one another, from hydrogen, fluorine substituted or unsubstituted C 1-12 An alkyl group, and at least one group is not hydrogen.
5. The electrolyte according to claim 4, wherein the fluorothiophene sulfonamide compound is at least one compound selected from the group consisting of compounds 1 to 4:
6. the electrolyte according to claim 1, wherein the weight of the fluorothiophene sulfonamide compound is 0.1-10 wt% of the total weight of the electrolyte.
7. The electrolyte of claim 1, wherein the electrolyte salt is selected from electrolyte lithium salts selected from lithium hexafluorophosphate (LiPF) 6 ) Lithium difluorophosphate (LiPO) 2 F 2 ) One or more of lithium difluorooxalato borate (LiDFOB), lithium difluorosulfonimide (LiTFSI), lithium bistrifluoromethylsulfonimide, lithium difluorobis-oxalato phosphate, lithium tetrafluoroborate, lithium bisoxalato borate, lithium hexafluoroantimonate, lithium hexafluoroarsenate, lithium bis (trifluoromethylsulfonyl) imide, lithium bis (pentafluoroethylsulfonyl) imide, lithium tris (trifluoromethylsulfonyl) methide or lithium bis (trifluoromethylsulfonyl) imide;
and/or the organic solvent is selected from carbonate and/or carboxylic ester, and the carbonate is selected from at least one of the following fluorinated or unsubstituted solvents: ethylene Carbonate (EC), propylene Carbonate (PC), dimethyl carbonate, diethyl carbonate (DEC), ethyl methyl carbonate; the carboxylic acid ester is at least one of the following fluorinated or unsubstituted solvents: propyl acetate, n-butyl acetate, isobutyl acetate, n-pentyl acetate, isoamyl acetate, propyl Propionate (PP), ethyl Propionate (EP), methyl butyrate, ethyl n-butyrate.
8. A battery comprising the electrolyte of any one of claims 1-7.
9. The battery according to claim 8, wherein the lithium ion battery further comprises a positive electrode sheet containing a positive electrode active material, a negative electrode sheet containing a negative electrode active material, and a separator.
10. The battery of claim 9, wherein the negative electrode active material comprises a carbon-based negative electrode material and/or a silicon-based negative electrode material; the carbon-based negative electrode material is selected from at least one of artificial graphite, natural graphite, mesocarbon microbeads, hard carbon and soft carbon; the silicon-based negative electrode material is selected from at least one of a silicon-oxygen negative electrode material or a silicon-carbon negative electrode material;
the positive active material is selected from at least one of transition metal lithium oxide, lithium iron phosphate and lithium manganate; the chemical formula of the transition metal lithium oxide is Li 1+x Ni y Co z M (1-y-z) O 2 Wherein x is more than or equal to-0.1 and less than or equal to 1; y is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, and y + z is more than or equal to 0 and less than or equal to 1; wherein M is at least one of Mg, zn, ga, ba, al, fe, cr, sn, V, mn, sc, ti, nb, mo and Zr.
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