CN113402540B - Lithium ion battery electrolyte acid inhibitor, electrolyte and lithium ion battery - Google Patents
Lithium ion battery electrolyte acid inhibitor, electrolyte and lithium ion battery Download PDFInfo
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- CN113402540B CN113402540B CN202110534206.2A CN202110534206A CN113402540B CN 113402540 B CN113402540 B CN 113402540B CN 202110534206 A CN202110534206 A CN 202110534206A CN 113402540 B CN113402540 B CN 113402540B
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- electrolyte
- lithium ion
- ion battery
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- acid inhibitor
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- 239000003792 electrolyte Substances 0.000 title claims abstract description 113
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 88
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 239000003112 inhibitor Substances 0.000 title claims abstract description 72
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title description 3
- 239000002253 acid Substances 0.000 claims abstract description 82
- 150000001875 compounds Chemical class 0.000 claims abstract description 66
- -1 lithium hexafluorophosphate Chemical compound 0.000 claims abstract description 24
- 239000003960 organic solvent Substances 0.000 claims abstract description 16
- 229940126062 Compound A Drugs 0.000 claims abstract description 13
- NLDMNSXOCDLTTB-UHFFFAOYSA-N Heterophylliin A Natural products O1C2COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC2C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)C(O)C1OC(=O)C1=CC(O)=C(O)C(O)=C1 NLDMNSXOCDLTTB-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000007774 positive electrode material Substances 0.000 claims description 11
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 10
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 9
- 239000007773 negative electrode material Substances 0.000 claims description 9
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 7
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 6
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 claims description 6
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 claims description 6
- 150000002148 esters Chemical class 0.000 claims description 4
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 claims description 3
- HNAGHMKIPMKKBB-UHFFFAOYSA-N 1-benzylpyrrolidine-3-carboxamide Chemical compound C1C(C(=O)N)CCN1CC1=CC=CC=C1 HNAGHMKIPMKKBB-UHFFFAOYSA-N 0.000 claims description 3
- HFZLSTDPRQSZCQ-UHFFFAOYSA-N 1-pyrrolidin-3-ylpyrrolidine Chemical compound C1CCCN1C1CNCC1 HFZLSTDPRQSZCQ-UHFFFAOYSA-N 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 3
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 3
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 3
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 3
- OBNCKNCVKJNDBV-UHFFFAOYSA-N butanoic acid ethyl ester Natural products CCCC(=O)OCC OBNCKNCVKJNDBV-UHFFFAOYSA-N 0.000 claims description 3
- 150000007942 carboxylates Chemical class 0.000 claims description 3
- 150000001733 carboxylic acid esters Chemical class 0.000 claims description 3
- WBJINCZRORDGAQ-UHFFFAOYSA-N formic acid ethyl ester Natural products CCOC=O WBJINCZRORDGAQ-UHFFFAOYSA-N 0.000 claims description 3
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 3
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 claims description 3
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 claims description 3
- 229940090181 propyl acetate Drugs 0.000 claims description 3
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 3
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 claims description 3
- PVDYNYCZGYOXAF-UHFFFAOYSA-N 2-fluoroethyl acetate Chemical compound CC(=O)OCCF PVDYNYCZGYOXAF-UHFFFAOYSA-N 0.000 claims description 2
- QDFKMKAEJXRCSK-UHFFFAOYSA-N fluoromethyl formate Chemical compound FCOC=O QDFKMKAEJXRCSK-UHFFFAOYSA-N 0.000 claims description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Natural products CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 68
- 230000002829 reductive effect Effects 0.000 abstract description 11
- 239000002841 Lewis acid Substances 0.000 abstract description 6
- 150000007517 lewis acids Chemical class 0.000 abstract description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical class [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 3
- 229940069428 antacid Drugs 0.000 abstract description 3
- 239000003159 antacid agent Substances 0.000 abstract description 3
- 230000001458 anti-acid effect Effects 0.000 abstract description 3
- 230000000536 complexating effect Effects 0.000 abstract description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 34
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 31
- 230000000694 effects Effects 0.000 description 18
- 101150058243 Lipf gene Proteins 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 12
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 9
- 229910013872 LiPF Inorganic materials 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 229910013870 LiPF 6 Inorganic materials 0.000 description 7
- 230000006872 improvement Effects 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 239000012046 mixed solvent Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 4
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 238000010668 complexation reaction Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 229910003002 lithium salt Inorganic materials 0.000 description 3
- 159000000002 lithium salts Chemical class 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- DCERHCFNWRGHLK-UHFFFAOYSA-N C[Si](C)C Chemical compound C[Si](C)C DCERHCFNWRGHLK-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910007991 Si-N Inorganic materials 0.000 description 2
- 229910006294 Si—N Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 125000004433 nitrogen atom Chemical group N* 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- PNGLEYLFMHGIQO-UHFFFAOYSA-M sodium;3-(n-ethyl-3-methoxyanilino)-2-hydroxypropane-1-sulfonate;dihydrate Chemical compound O.O.[Na+].[O-]S(=O)(=O)CC(O)CN(CC)C1=CC=CC(OC)=C1 PNGLEYLFMHGIQO-UHFFFAOYSA-M 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 description 1
- RZYHXKLKJRGJGP-UHFFFAOYSA-N 2,2,2-trifluoro-n,n-bis(trimethylsilyl)acetamide Chemical compound C[Si](C)(C)N([Si](C)(C)C)C(=O)C(F)(F)F RZYHXKLKJRGJGP-UHFFFAOYSA-N 0.000 description 1
- WNQJNSIPFOYZPG-UHFFFAOYSA-N 2-fluoro-2-methylbutanoic acid Chemical compound CCC(C)(F)C(O)=O WNQJNSIPFOYZPG-UHFFFAOYSA-N 0.000 description 1
- SLLPUEVDRDZQPS-UHFFFAOYSA-N 5-methyl-3-trimethylsilyl-1,3-oxazolidin-2-one Chemical compound CC1CN([Si](C)(C)C)C(=O)O1 SLLPUEVDRDZQPS-UHFFFAOYSA-N 0.000 description 1
- 229910032387 LiCoO2 Inorganic materials 0.000 description 1
- QOSMNYMQXIVWKY-UHFFFAOYSA-N Propyl levulinate Chemical compound CCCOC(=O)CCC(C)=O QOSMNYMQXIVWKY-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 1
- SOXUFMZTHZXOGC-UHFFFAOYSA-N [Li].[Mn].[Co].[Ni] Chemical compound [Li].[Mn].[Co].[Ni] SOXUFMZTHZXOGC-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- FZXXGBGMLALCIH-UHFFFAOYSA-N butyl 2-fluoroacetate Chemical compound CCCCOC(=O)CF FZXXGBGMLALCIH-UHFFFAOYSA-N 0.000 description 1
- CRBXQJHBOIIYLY-UHFFFAOYSA-N butyl 2-fluoropropanoate Chemical compound CCCCOC(=O)C(C)F CRBXQJHBOIIYLY-UHFFFAOYSA-N 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 125000006575 electron-withdrawing group Chemical group 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- VCYZVXRKYPKDQB-UHFFFAOYSA-N ethyl 2-fluoroacetate Chemical compound CCOC(=O)CF VCYZVXRKYPKDQB-UHFFFAOYSA-N 0.000 description 1
- ONLLXDPBECIJCM-UHFFFAOYSA-N ethyl 2-fluorobutanoate Chemical compound CCOC(=O)C(F)CC ONLLXDPBECIJCM-UHFFFAOYSA-N 0.000 description 1
- PWEHMQBAMSTRDF-UHFFFAOYSA-N ethyl carbonofluoridate Chemical compound CCOC(F)=O PWEHMQBAMSTRDF-UHFFFAOYSA-N 0.000 description 1
- 125000004494 ethyl ester group Chemical group 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 230000000670 limiting effect Effects 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
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- YGJMWVCEUNWDOU-UHFFFAOYSA-N methyl carbonofluoridate Chemical compound COC(F)=O YGJMWVCEUNWDOU-UHFFFAOYSA-N 0.000 description 1
- 125000005740 oxycarbonyl group Chemical group [*:1]OC([*:2])=O 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- IRWIXUQVVIFUPL-UHFFFAOYSA-N propyl 2-fluoroacetate Chemical compound CCCOC(=O)CF IRWIXUQVVIFUPL-UHFFFAOYSA-N 0.000 description 1
- LXPTXVYIIYSSHU-UHFFFAOYSA-N propyl 2-fluoropropanoate Chemical compound CCCOC(=O)C(C)F LXPTXVYIIYSSHU-UHFFFAOYSA-N 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- DCKVNWZUADLDEH-UHFFFAOYSA-N sec-butyl acetate Chemical compound CCC(C)OC(C)=O DCKVNWZUADLDEH-UHFFFAOYSA-N 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/10—Compounds having one or more C—Si linkages containing nitrogen having a Si-N linkage
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0002—Aqueous electrolytes
- H01M2300/0005—Acid electrolytes
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Secondary Cells (AREA)
Abstract
The application discloses an acid inhibitor for lithium ion battery electrolyte, the electrolyte and a lithium ion battery, wherein the acid inhibitor comprises at least one of a compound A or a compound B with the structure shown as follows:
the antacid according to the present application is capable of reacting with water, HF, and with a Lewis acid PF 5 And coordination complexing is carried out, so that the water and HF content in the electrolyte can be sufficiently reduced. In addition, the lithium ion battery electrolyte according to the application comprises lithium hexafluorophosphate, an organic solvent and the acid inhibitor, and the content of water and HF in the electrolyte can be effectively reduced after the acid inhibitor is added, sealed and placed compared with the electrolyte without the acid inhibitor.
Description
Technical Field
The application relates to the field of lithium ion batteries, in particular to an acid inhibitor for electrolyte of a lithium ion battery, the electrolyte containing the acid inhibitor and the lithium ion battery.
Background
A lithium ion battery is a kind of secondary battery (rechargeable battery) that mainly relies on lithium ions (Li) + ) And moves between the positive electrode and the negative electrode to operate. During charging of lithium ion batteries, li + The lithium ion is extracted from the positive electrode and is inserted into the negative electrode through the electrolyte, so that the negative electrode is in a lithium-rich state, the conversion of electric energy into chemical energy is realized, and the reverse process is just realized.
The lithium ion battery has the advantages of higher working voltage, high energy density, environmental friendliness and the like, and is widely applied to the fields of 3C consumer batteries, power batteries, energy storage batteries and the like. In the lithium ion battery, the electrolyte is the only material in contact with the anode, the cathode and the diaphragm, and plays an important role in the specific capacity, the working temperature range, the cycle efficiency, the safety performance and the like of the battery.
The electrolyte of commercial lithium ion batteries is generally lithium salt LiPF 6 Dissolving in a mixed solvent of cyclic and linear carbonates to obtain a 1mol/L solution. However, the organic solvent inevitably contains a small amount of moisture, and the electrolyte is extremely sensitive to the presence of moisture, mainly due to LiPF contained therein 6 Is highly sensitive to waterLiPF at very low water levels (< 10 ppm) 6 All react with the catalyst to produce an acidic compound such as Hydrogen Fluoride (HF). HF is very undesirable for Li-ion batteries, has very high corrosion and dissolves Solid Electrolyte Interface (SEI) films, e.g., li in the SEI film 2 CO 3 LiF is generated by reaction, so that the stability and compactness of the SEI film are damaged, and the impedance of an electrode interface is increased. In addition, HF reacts with the positive electrode material of the battery, causing elution of metal ions in the positive electrode material and destruction of the material structure.
In addition, liPF 6 Also can decompose by itself to produce a trace amount of PF 5 . Thermal failure studies showed that at PF 5 The SEI film is decomposed at a moderate temperature range of 60 to 135 ℃, thereby accelerating the thickening of the SEI film and increasing the degree of polarization of the battery. In addition, the decomposition reaction of SEI film also includes acid-catalyzed reaction, for example, strong Lewis acid PF 5 Can catalyze Li 2 CO 3 The lithium alkylcarbonate decomposes to generate a gas or a soluble organic substance, thereby making the SEI film porous.
Thus, it can be seen that PF 5 And HF have great damage to the battery performance, however, no particularly effective means for effectively inhibiting PF in electrolyte exists at present 5 And reducing the HF content.
Disclosure of Invention
Aiming at the defects in the prior art, the application provides an acid inhibitor for lithium ion battery electrolyte, the electrolyte and a lithium ion battery, which can reduce the content of hydrofluoric acid in the electrolyte and inhibit PF in the electrolyte 5 Activity of (2).
In order to achieve the above object, in a first aspect, the present application provides an acid inhibitor for an electrolyte of a lithium ion battery, the acid inhibitor comprising at least one of a compound a or a compound B having a structure shown as follows:
in a second aspect, the present inventionThe application provides a lithium ion battery electrolyte comprising lithium hexafluorophosphate (LiPF) 6 ) An organic solvent and an acid inhibitor according to claim 1.
In combination with the second aspect, in a possible embodiment, the acid inhibitor is present in the electrolyte in an amount of 0.005wt% to 0.05wt%.
In combination with the second aspect, in a possible embodiment, the mass content of the acid inhibitor in the electrolyte is 0.01wt% to 0.03wt%.
In one possible embodiment in combination with the second aspect, the concentration of the lithium hexafluorophosphate in the electrolyte solution is 0.8mol/L to 1.2mol/L.
In one possible embodiment in combination with the second aspect, the organic solvent includes at least one of a carbonate, a carboxylate, and a fluorocarboxylate.
In combination with the second aspect, in one possible embodiment, the carbonate includes at least one of dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, ethyl methyl carbonate, butylene carbonate, or propyl methyl carbonate.
In one possible embodiment in combination with the second aspect, the carboxylic acid ester includes at least one of ethyl formate, ethyl acetate, propyl acetate, butyl acetate, propyl propionate, butyl propionate, ethyl butyrate, methyl formate, or ethyl propionate.
In combination with the second aspect, in one possible embodiment, the fluorocarboxylic acid ester includes at least one of ethylfluorocarboxylate, ethylfluoroacetate, propylfluoroacetate, butylfluoroacetate, ethylfluoropropionate, propyl fluoropropionate, butyl fluoropropionate, ethyl fluorobutyrate, or methyl fluorocarboxylate.
In a third aspect, the present application provides a lithium ion battery comprising:
the positive electrode comprises a positive electrode current collector and a positive electrode active material layer which is arranged on the surface of the positive electrode current collector and contains a positive electrode active material;
the negative electrode comprises a negative electrode current collector and a negative electrode active material layer which is arranged on the surface of the negative electrode current collector and contains a negative electrode active material;
a separator provided between the positive electrode and the negative electrode; and
the electrolyte according to the second aspect above.
The technical scheme that this application provided compares prior art and has following beneficial effect at least:
the acid inhibitor can react with water to reduce the water content in the electrolyte, thereby reducing LiPF 6 The amount of HF formed by reaction with water; moreover, the acid inhibitor can react with HF, so that the amount of the generated HF in the electrolyte is further reduced; in addition, the antacid can be mixed with PF, a Lewis acid 5 Coordination complexation, PF reduction 5 Activity of (2).
Compared with the electrolyte without the acid inhibitor, the lithium ion battery electrolyte containing the acid inhibitor can effectively reduce the content of water and HF in the electrolyte after the acid inhibitor is added, sealed and placed.
According to the lithium ion battery provided by the application, the acid inhibitor is added into the electrolyte, so that the amount of HF generated in the electrolyte can be reduced, the side reaction of the lithium ion battery is reduced, the stability and compactness of an SEI (solid electrolyte interphase) film on the surface of a pole piece are improved, the impedance of an electrode interface is reduced, and the cycling stability of the battery is improved.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art, the present application will be described in further detail with reference to the following examples, but it should be understood that the following examples are only preferred embodiments of the present application, and the scope of the present application is defined by the scope of the claims.
In a first aspect, the present application provides an acid inhibitor for lithium ion battery electrolyte, the acid inhibitor comprising at least one of a compound a or a compound B having a structure shown below:
the inventors found that in the presence of a lithium salt LiPF 6 In the lithium ion battery electrolyte of (1), liPF 6 The reaction process for the reaction with water to form HF is shown below:
LiPF 6 →LiF+PF 5
H 2 O+PF 5 →POF 3 +2HF
as can be seen from the above reaction formula, liPF 6 First decompose itself to produce a trace amount of PF 5 ，PF 5 Belongs to strong Lewis acid, has strong chemical activity and is easy to react with water to generate HF, so the LiPF 6 The reaction with water is mainly its own decomposition product PF 5 React with water to form HF.
Therefore, based on the above situation, the present application controls the PF 5 The effective inhibition of PF in the electrolyte is realized by adding an acid inhibitor (compound A and/or compound B) 5 Activity and reduction of the content of HF.
In the technical scheme of the application, the acid inhibitor comprises at least one of a compound A (bis (trimethylsilyl) trifluoroacetamide) or a compound B (5-methyl-3- (trimethylsilyl) oxazolidin-2-one), which can react with H firstly 2 O reaction, reducing the water content in the electrolyte, thereby reducing LiPF from the source 6 PF as a decomposition product of 5 Amount of HF formed by reaction with water; secondly, compounds A and B both contain Trimethylsilyl (TMS) groups that can react with HF, effectively trapping F of HF - Thereby reducing the amount of HF generated in the electrolyte, and the nitrogen atoms connected with TMS in the compounds A and B are also connected with a strong electron-withdrawing group (trifluoromethyl carbonyl or oxycarbonyl), thereby being more beneficial to the fracture of Si-N bonds, promoting the release of TMS and further increasing the F-pair - The captured force is used for further removing HF; thirdly, the N atoms contained in the compound A and the compound B have lone pair electrons, have strong coordination complexing ability and can be matched with the Lewis acid PF 5 Coordination complexation, PF reduction 5 Reactivity with water and thus also the production of HF can be reduced.
Therefore, the acid inhibitor for the lithium ion battery electrolyte can play a role in three aspects of water removal, acid absorption, activity inhibition and the like, greatly inhibits the generation of HF in the lithium ion battery electrolyte, further reduces the damage to battery components such as SEI films and anode materials, effectively maintains the charge and discharge performance of the lithium ion battery, and prolongs the cycle life of the lithium ion battery.
In a second aspect, the present application provides a lithium ion battery electrolyte comprising lithium hexafluorophosphate (LiPF) 6 ) An organic solvent and the above acid inhibitor.
In the prior art, organic solvents and the like inevitably contain trace moisture and moisture introduced in the preparation process, so that the lithium ion battery electrolyte contains moisture and is mixed with LiPF 6 The reaction produces HF. In order to solve the problem, a specific acid inhibitor is added into the lithium ion battery electrolyte, so that the content of water and HF in the electrolyte can be effectively reduced after the electrolyte is placed in a sealed mode compared with the electrolyte which is not added.
Further, in the lithium ion battery electrolyte according to the application, the mass content of the acid inhibitor in the electrolyte is 0.005wt% -0.05 wt%, namely 50-500 ppm. The mass content of the acid inhibitor may be specifically 0.005wt%, 0.006wt%, 0.008wt%, 0.01wt%, 0.02wt%, 0.03wt%, 0.04wt%, or 0.05wt%, but it is not limited thereto, and may be other values within the above range.
At such a small amount, the acid inhibitor according to the present application can exhibit remarkable water removal, acid absorption, and activity inhibition effects. In consideration of the control of the initial water content of the electrolyte in the actual industry and the improvement degree of the water and acid removing effect, the mass content of the acid inhibitor in the electrolyte can be preferably 0.01wt% to 0.03wt%, namely 100ppm to 300ppm. Specifically, the water content of lithium ion battery electrolyte in actual industry is usually much less than 300ppm, in this case, adding 300ppm of acid inhibitor can fully exert sufficient effect, and when the adding amount of acid inhibitor is between 300-500 ppm, the water and acid removing effect is still further improved, but the improvement is already slowed down.
Further, in the electrolyte for a lithium ion battery according to the present application, the concentration of the lithium hexafluorophosphate in the electrolyte may be 0.8mol/L to 1.2mol/L, specifically, 0.8mol/L, 0.9mol/L, 0.95mol/L, 1.0mol/L, 1.05mol/L, 1.1mol/L, 1.15mol/L, or 1.2mol/L, and the like, and may of course be other values within the above range. When the concentration of the hexafluorophosphoric acid is less than 0.8mol/L, the lithium ion concentration of the electrolyte is low, and the ionic conductivity is too low, resulting in the reduction of the rate capability and cycle performance of the battery. When the concentration of the hexafluorophosphoric acid is more than 1.2mol/L, the lithium salt may be difficult to dissolve, or crystallization may occur during low-temperature storage after dissolution, the viscosity of the electrolyte is too high, the conductivity of lithium ions is reduced, the use window of the electrolyte is narrow, the wettability is poor, and the electrochemical performance of the battery is affected. The concentration of the lithium hexafluorophosphate in the electrolyte is preferably 0.8mol/L to 1.0mol/L.
Further, in the lithium ion battery electrolyte according to the present application, the organic solvent includes at least one of carbonate, carboxylate, and fluorocarboxylate. In the application, the organic solvent may be various organic solvents commonly used in lithium ion battery electrolytes, and those skilled in the art may select the organic solvent according to actual needs. The acid inhibitor according to the present invention can be applied to various organic solvents described above, and the application range is very wide.
The carbonate may include at least one of dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, ethyl methyl carbonate, butylene carbonate, or propyl methyl carbonate.
The carboxylic acid ester may include at least one of ethyl formate, ethyl acetate, propyl acetate, butyl acetate, propyl propionate, butyl propionate, ethyl butyrate, methyl formate, or ethyl propionate.
The fluorocarboxylic acid ester may include at least one of fluoroethyl formate, fluoroethyl acetate, fluoropropyl acetate, fluorobutyl acetate, fluoropropionic acid ethyl ester, fluoropropionic acid propyl ester, fluoropropionic acid butyl ester, fluorobutyric acid ethyl ester, or fluoromethyl formate.
Further, in the lithium ion battery electrolyte according to the present application, the electrolyte further includes an additive including at least one of fluoroethylene carbonate (FEC), 1, 3-Propane Sultone (PS), vinylene Carbonate (VC), or nitrile compounds. Understandably, the additive is added into the electrolyte, so that a stable electrolyte film is formed on the surface of a battery pole piece, and the circulation stability of the lithium ion battery is improved.
The application also provides an electrochemical device, which comprises a positive current collector and a positive active material layer which is arranged on the surface of the positive current collector and contains a positive active material;
the negative electrode comprises a negative electrode current collector and a negative electrode active material layer which is arranged on the surface of the negative electrode current collector and contains a negative electrode active material;
a separator provided between the positive electrode and the negative electrode;
and the electrolyte solution according to the above.
As an optional technical scheme, the positive electrode active material layer comprises a positive electrode active material, a binder and a conductive agent.
As an improvement of the electrochemical device, the positive active material is selected from at least one of lithium cobaltate LiCoO2, lithium nickel manganese cobalt ternary material, lithium iron phosphate, lithium iron manganese phosphate and lithium manganese.
As an improvement of the electrochemical device of the present application, the negative electrode active material layer of the present application includes a negative electrode active material, a binder, and a conductive agent.
As a modification of the electrochemical device of the present application, the negative electrode active material is selected from at least one of lithium metal or lithium metal alloy compound, carbon material, graphite material, silicon material, or silicon oxide material.
The present application also provides an electronic device comprising the electrochemical device described above.
The lithium ion battery electrolyte acid inhibitor according to the application can react with water firstly, so that the water content in the electrolyte is reduced, and LiPF is reduced 6 The amount of HF formed by reaction with water; secondly, the acid inhibitor can react with HF to further reduce the electrolyteThe amount of HF that has been generated; thirdly, the antacid can also react with Lewis acid PF 5 Coordination complexation, PF reduction 5 Activity of (2).
In addition, compared with the electrolyte without the acid inhibitor, the lithium ion battery electrolyte containing the acid inhibitor can effectively reduce the content of water and HF in the electrolyte after being sealed and placed for a period of time, further reduces damage to battery components such as SEI films and cathode materials, effectively maintains the charge and discharge performance of the lithium ion battery, and improves the cycle life of the lithium ion battery.
In addition, each of the compounds used herein is commercially available or ordered, and can be commercially obtained on the market by those skilled in the art as needed.
The technical solution of the present application is exemplarily described below by specific embodiments:
< example >
Comparative example 1
A mixed solvent of Ethylene Carbonate (EC), ethyl Methyl Carbonate (EMC) and dimethyl carbonate (BMC) in a weight ratio of 1. Lithium hexafluorophosphate (LiPF) 6 ) Dissolved in the above system to prepare a solution having a concentration of 1.0mol/L, thereby obtaining a lithium ion battery electrolyte X.
Comparative example 2
To the lithium ion battery electrolyte X of comparative example 1, water was added so that the initial concentration of water was 0.01wt% (100 ppm), thereby obtaining a lithium ion battery electrolyte Y.
Comparative example 3
To the lithium ion battery electrolyte X of comparative example 1, water was added so that the initial concentration of water was 0.03wt% (300 ppm), thereby obtaining a lithium ion battery electrolyte Z.
Examples 1 to 1
Adopting Ethylene Carbonate (EC) and methyl ethyl carbonate (METH) in a weight ratio of 1The mixed solvent of Ester (EMC) and dimethyl carbonate (BMC) is used as the organic solvent of the lithium ion battery electrolyte, and Vinylene Carbonate (VC) and fluoroethylene carbonate (FEC) which are additives accounting for 2.5wt% of the system are added into the mixed solvent. Mixing lithium hexafluorophosphate (LiPF) 6 ) Dissolved in the above system to prepare a solution having a concentration of 1.0mol/L, and the compound A of the present application was added as an acid inhibitor so that the mass content of the compound A was 0.005wt% (50 ppm), thereby obtaining a lithium ion battery electrolyte XA1 according to the present application.
Examples 1 to 2
A lithium ion battery electrolyte XA2 according to the present application was obtained in the same manner as in example 1-1, except that the compound a of the present application was added as an acid inhibitor so that the mass content of the compound a was 0.02wt% (200 ppm).
Examples 1 to 3
A lithium ion battery electrolyte XA3 according to the present application was obtained in the same manner as in example 1-1, except that the compound a of the present application was added as an acid inhibitor so that the mass content of the compound a was 0.03wt% (300 ppm).
Examples 1 to 4
A lithium ion battery electrolyte XA4 according to the present application was obtained in the same manner as in example 1-1, except that the compound a of the present application was added as an acid inhibitor so that the mass content of the compound a was 0.05wt% (500 ppm).
Examples 1 to 5
A lithium ion battery electrolyte YA5 according to the present application was obtained in the same manner as in example 1-1, except that the compound a of the present application was added as an acid inhibitor so that the mass content of the compound a was 0.02wt% (200 ppm), and water was added so that the initial concentration of water was 0.01wt% (100 ppm).
Examples 1 to 6
A lithium ion battery electrolyte YA6 according to the present application was obtained in the same manner as in example 1-1, except that the compound a of the present application was added as an acid inhibitor so that the mass content of the compound a was 0.03wt% (300 ppm), and water was added so that the initial concentration of water was 0.01wt% (100 ppm).
Examples 1 to 7
A lithium ion battery electrolyte YA7 according to the present application was obtained in the same manner as in example 1-1, except that the compound a of the present application was added as an acid inhibitor so that the mass content of the compound a was 0.05wt% (500 ppm), and water was added so that the initial concentration of water was 0.01wt% (100 ppm).
Examples 1 to 8
A lithium ion battery electrolyte ZA8 according to the present application was obtained in the same manner as in example 1-1, except that the compound a of the present application was added as an acid inhibitor so that the mass content of the compound a was 0.02wt% (200 ppm), and water was added so that the initial concentration of water was 0.03wt% (300 ppm).
Examples 1 to 9
A lithium ion battery electrolyte ZA9 according to the present application was obtained in the same manner as in example 1-1, except that the compound a of the present application was added as an acid inhibitor so that the mass content of the compound a was 0.03wt% (300 ppm), and water was added so that the initial concentration of water was 0.03wt% (300 ppm).
Examples 1 to 10
A lithium ion battery electrolyte ZA10 according to the present application was obtained in the same manner as in example 1-1, except that the compound a of the present application was added as an acid inhibitor so that the mass content of the compound a was 0.05wt% (500 ppm), and water was added so that the initial concentration of water was 0.03wt% (300 ppm).
Example 2-1
A mixed solvent of Ethylene Carbonate (EC), ethyl Methyl Carbonate (EMC) and dimethyl carbonate (BMC) in a weight ratio of 1. Mixing lithium hexafluorophosphate (LiPF) 6 ) Dissolved in the above system to give a concentration of 1.0moL/L, and adding the compound B of the present application as an acid inhibitor so that the mass content of the compound B is 0.005wt% (50 ppm), thereby obtaining the lithium ion battery electrolyte XB1 according to the present application.
Examples 2 to 2
Except that the compound B of the present application was added as an acid inhibitor so that the mass content of the compound B was 0.02wt% (200 ppm), a lithium ion battery electrolyte XB2 according to the present application was obtained in the same manner as in example 2-1.
Examples 2 to 3
Except that the compound B of the present application was added as an acid inhibitor so that the mass content of the compound B was 0.03wt% (300 ppm), a lithium ion battery electrolyte XB3 according to the present application was obtained in the same manner as in example 2-1.
Examples 2 to 4
Except that the compound B of the present application was added as an acid inhibitor so that the mass content of the compound B was 0.05wt% (500 ppm), a lithium ion battery electrolyte XB4 according to the present application was obtained in the same manner as in example 2-1.
Examples 2 to 5
A lithium ion battery electrolyte YB5 according to the present application was obtained in the same manner as in example 2-1, except that the compound B of the present application was added as an acid inhibitor so that the mass content of the compound B was 0.02wt% (200 ppm), and water was added so that the initial concentration of water was 0.01wt% (100 ppm).
Examples 2 to 6
A lithium ion battery electrolyte YB6 according to the present application was obtained in the same manner as in example 2-1, except that the compound B of the present application was added as an acid inhibitor so that the mass content of the compound B was 0.03wt% (300 ppm), and water was added so that the initial concentration of water was 0.01wt% (100 ppm).
Examples 2 to 7
A lithium ion battery electrolyte YB7 according to the present application was obtained in the same manner as in example 2-1, except that the compound B of the present application was added as an acid inhibitor so that the mass content of the compound B was 0.05wt% (500 ppm), and water was added so that the initial concentration of water was 0.01wt% (100 ppm).
Examples 2 to 8
A lithium ion battery electrolyte ZB8 according to the present application was obtained in the same manner as in example 2-1, except that the compound B of the present application was added as an acid inhibitor so that the mass content of the compound B was 0.02wt% (200 ppm), and water was added so that the initial concentration of water was 0.03wt% (300 ppm).
Examples 2 to 9
A lithium ion battery electrolyte ZB9 according to the present application was obtained in the same manner as in example 2-1, except that the compound B of the present application was added as an acid inhibitor so that the mass content of the compound B was 0.03wt% (300 ppm), and water was added so that the initial concentration of water was 0.03wt% (300 ppm).
Examples 2 to 10
A lithium ion battery electrolyte ZB10 according to the present application was obtained in the same manner as in example 2-1, except that the compound B of the present application was added as an acid inhibitor so that the mass content of the compound B was 0.05wt% (500 ppm), and water was added so that the initial concentration of water was 0.03wt% (300 ppm).
In the above comparative examples and examples, the concentrations of added water and/or the acid inhibitor according to the present application were very slight, and thus the addition thereof was made to the organic solvent and LiPF in the electrolyte system 6 The influence of the content ratio of (A) is negligible.
The lithium ion battery electrolytes in the comparative examples and the examples were sealed and left standing at normal temperature for 1 day and 1 week, respectively, and H was measured 2 The contents of O (wt%) and HF (wt%) are shown in table 1 below.
[ Table 1]
As can be seen from table 1 above, the lithium ion battery electrolytes according to the examples of the present application contain the acid suppressor compound a/B in a small amount, but are still capable of suppressing the contents of water and HF significantly and continuously, as compared to comparative examples 1 to 3.
Specifically, as shown in comparative examples 1 to 3, in the presence of raw water in the electrolyte or after further addition of water, water reacts with LiPF 6 The reaction takes place, the water content decreases after 1 week, the HF content increases gradually, and this phenomenon increases as the initial water content in the electrolyte increases. In contrast, examples 1-1 to 1-10, in which the acid inhibitor compound a according to the present application was added, all of them had a significant effect of reducing the water content and the HF content after standing for 1 day and 1 week at the sealing normal temperature at different initial water contents of the electrolyte, and the effect was better as the acid inhibitor addition amount was increased. And along with the increase of the initial water content of the electrolyte, the addition amount of the acid inhibitor is also correspondingly increased to achieve better water and acid removing effects. Considering that the water removal and acid removal effect of the acid inhibitor is limited when the addition amount of the acid inhibitor is 0.05wt% (500 ppm) and the effect promotion when the addition amount is 0.03wt% (300 ppm), and in the practical application process, the initial water content of the electrolyte can be controlled below 0.03wt%, so that the addition amount of the acid inhibitor of 0.03wt% can meet the conventional production requirement.
In addition, examples 2-1 to 2-10, in which the acid inhibitor compound B according to the present application was added, have effects similar to those of examples 1-1 to 1-10, but the effect of compound A is more excellent than that of compound A, which is mainly due to the fact that the group (trifluoromethylcarbonyl) bonded to N in compound A has a stronger electron-withdrawing ability in relation to the bond energy of the Si-N bond, si-N is more easily cleaved, and trimethylsilyl is more easily released to react with water and HF.
The above-described embodiments of the present application are only examples of the present application and should not be construed as limiting the present application, and those skilled in the art can make modifications without inventive contribution as required after reading the present specification, however, any modifications, equivalents, improvements, etc. within the spirit and principle of the present application should be included in the scope of the present application.
Claims (10)
1. The application of the compound as an acid inhibitor of lithium ion battery electrolyte is characterized in that the compound comprises a compound A with the structure as shown in the specification:
[ Compound A ].
2. Use of a compound in the preparation of a lithium ion battery electrolyte, wherein the lithium ion battery electrolyte comprises lithium hexafluorophosphate, an organic solvent and an acid inhibitor comprising a compound a of the structure:
[ Compound A ].
3. The use of the compound according to claim 2 in the preparation of an electrolyte for a lithium ion battery, wherein the mass content of the acid inhibitor in the electrolyte is 0.005wt% to 0.05wt%.
4. The use of the compound according to claim 3 in the preparation of an electrolyte for a lithium ion battery, wherein the mass content of the acid inhibitor in the electrolyte is 0.01wt% to 0.03wt%.
5. The use of the compound of claim 2 in the preparation of an electrolyte for a lithium ion battery, wherein the concentration of the lithium hexafluorophosphate in the electrolyte is 0.8-1.2 mol/L.
6. Use of a compound according to claim 2 in the preparation of a lithium ion battery electrolyte, wherein the organic solvent comprises at least one of a carbonate, a carboxylate and a fluorocarboxylate.
7. Use of a compound according to claim 6 in the preparation of a lithium ion battery electrolyte, wherein the carbonate comprises at least one of dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, ethyl methyl carbonate, butylene carbonate or methyl propyl carbonate.
8. Use of a compound according to claim 6 for the preparation of a lithium ion battery electrolyte, wherein the carboxylic acid ester comprises at least one of ethyl formate, ethyl acetate, propyl acetate, butyl acetate, propyl propionate, butyl propionate, ethyl butyrate, methyl formate or ethyl propionate.
9. Use of a compound according to claim 6 in the preparation of a lithium ion battery electrolyte, wherein the fluorocarboxylic acid ester comprises at least one of fluoroethyl formate, fluoroethyl acetate, fluoropropyl acetate, fluorobutyl acetate, fluoropropyl propionate, fluorobutyl butyrate or fluoromethyl formate.
10. Use of a compound for the preparation of a lithium ion battery, wherein the lithium ion battery comprises:
the positive electrode comprises a positive electrode current collector and a positive electrode active material layer which is arranged on the surface of the positive electrode current collector and contains a positive electrode active material;
the negative electrode comprises a negative electrode current collector and a negative electrode active material layer which is arranged on the surface of the negative electrode current collector and contains a negative electrode active material;
a separator provided between the positive electrode and the negative electrode; and
an electrolyte comprising lithium hexafluorophosphate, an organic solvent and an acid inhibitor comprising a compound a of the structure:
[ Compound A ].
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