CN117525579A - Lithium ion battery electrolyte and lithium ion battery - Google Patents

Lithium ion battery electrolyte and lithium ion battery Download PDF

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Publication number
CN117525579A
CN117525579A CN202210897724.5A CN202210897724A CN117525579A CN 117525579 A CN117525579 A CN 117525579A CN 202210897724 A CN202210897724 A CN 202210897724A CN 117525579 A CN117525579 A CN 117525579A
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ion battery
additive
lithium ion
lithium
substituted
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陈黎
王婷婷
甘朝伦
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Zhangjiagang Guotai Huarong New Chemical Materials Co Ltd
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Zhangjiagang Guotai Huarong New Chemical Materials Co Ltd
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    • 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
    • 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
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • 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)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to a lithium ion battery electrolyte and a lithium ion battery, and mainly solves the problem of poor high-low temperature performance of the lithium ion battery. The invention adds a first additive into the electrolyte, wherein the first additive is selected from one or more of compounds shown as a structural formula A, and the structural formula A is

Description

Lithium ion battery electrolyte and lithium ion battery
Technical Field
The invention relates to a lithium ion battery electrolyte and a lithium ion battery.
Background
With the development of portable electronic products in the directions of miniaturization and multifunction, and the higher requirements of power batteries on endurance mileage and application environment, the performance of lithium ion batteries is challenged more.
In order to improve the energy density of the lithium ion battery, the simplest method is to change the anode and cathode materials of the lithium ion battery. A nickel-cobalt-manganese ternary cathode material having a high energy density is used, however, the cathode material is susceptible to dissolution of cobalt ions/manganese ions during a cycle process or a high-temperature storage process, thereby causing degradation of battery performance. Compared with the current main stream negative electrode material graphite (energy density theoretical maximum value 372 mAh/g), silicon has the theoretical gram capacity of 4200mAh/g, and the earth storage capacity is high, so that the silicon-based material combining the conductivity and stability of the carbon material and the high capacity of the silicon material has great development potential. However, silicon-based materials tend to cause severe voltage drop of high-temperature gas production/battery due to large volume expansion effect, especially during high-temperature storage and circulation, thereby deteriorating battery performance. Therefore, there is a need to improve the performance of lithium ion batteries, such as high temperature cycling, high Wen Gezhi, etc.
Disclosure of Invention
The invention aims to solve the technical problem of providing a lithium ion battery electrolyte and a lithium ion battery, wherein the lithium ion battery electrolyte can improve the high-temperature circulation capacity of the lithium ion battery, inhibit the swelling of the battery after high-temperature laying, improve the capacity retention rate and improve the rate discharge at low temperature.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a lithium ion battery electrolyte, which comprises an organic solvent, lithium salt and an additive, and is characterized in that: the additive comprises a first additive, wherein the first additive is selected from one or more of compounds shown in a structural formula A, and the structural formula A isWherein R1, R2 and R3 are each independently selected from a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, alkenyl group, alkynyl group having 1 to 6 carbon atoms, cyano group, phenyl group, halophenyl group, carbonyl group, phenoxy group, thiophenyl group, amido group, thiophen-2-ylthio group, or any two of R1, R2 and R3 form a substituted or unsubstituted cyclic alkenyl group, the substituted group comprisingIncludes halogen atom and amino group.
Preferably, each of R1, R2 and R3 is independently selected from a hydrogen atom, a substituted or unsubstituted alkyl group with 1 to 3 carbon atoms, a halogenated phenyl group, a carbonyl group with 2 to 6 carbon atoms, a thiophenyl group, a thiophen-2-ylsulfanyl group, or any two of R1, R2 and R3 form a substituted or unsubstituted cyclic alkenyl group with 3 to 6 carbon atoms, wherein the substituted group is selected from a halogen atom, an amino group, and the halogen atom is selected from one or more of fluorine, chlorine and bromine.
Further preferably, the first additive is selected from one or more of the following structural formulas:
preferably, the first additive accounts for 0.5% -2.0% of the total weight of the electrolyte.
Further preferably, the first additive accounts for 0.9% -1.5% of the total weight of the electrolyte, for example, may be 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4% and the like.
Preferably, the additive further comprises a second additive and a third additive, the second additive being selected from one or more of the phosphorus-containing lithium fluoride salts; the third additive is selected from one or more of compounds shown in structural formula C, wherein the structural formula C isWherein, R4 is a group containing one or more of borate, phosphate, phosphite, isocyanate, heterocyclic, amino and sulfate.
Further preferably, the second additive is selected from one or more of lithium difluorophosphate, lithium difluorobis oxalato phosphate, lithium tetrafluorooxalato phosphate.
Further preferably, the third additive is selected from one or more of the following structural formulas:
preferably, the second additive accounts for 0.1-2.0% of the total weight of the electrolyte.
Further preferably, the second additive accounts for 0.4% -1.0% of the total weight of the electrolyte, for example, may be 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0% and the like.
Preferably, the third additive accounts for 0.1-2.0% of the total weight of the electrolyte.
Further preferably, the third additive accounts for 0.4% -1.0% of the total weight of the electrolyte, for example, may be 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0% and the like.
Preferably, the additive further comprises other additives selected from one or more of double bond-containing cyclic carbonates, halogen-containing cyclic carbonates, sulfonates, sulfates, sulfites, anhydrides, benzene compounds, fluorobenzene compounds, nitriles, phosphates, phosphites, boron compounds, amine compounds, silicon-containing compounds, heterocyclic compounds.
Further preferred, the other additives include one or more of vinylene carbonate, ethylene carbonate, fluoroethylene carbonate, ethylene sulfate, methylene methane disulfonate, ethylene sulfite, 1, 3-propane sultone, biphenyl, succinic anhydride, glutaric anhydride, cyclohexylbenzene, t-butylbenzene, t-pentylbenzene, m-fluorotoluene, 3, 4-difluorotoluene, 4-bromo-2-fluoroanisole, p-fluorotoluene, p-xylene, 1, 2-dimethoxy-4-nitrobenzene, N-phenylmaleimide, pentafluoroanisole, 2, 5-di-t-butyl, 1, 4-dimethoxybenzene, adiponitrile, hexanetrinitrile, succinonitrile, 1,2, 3-tris (2-cyanoethoxy) propane, N-butylamine, ethanolamine, N-dicyclohexylcarbodiimide, N-diethyltrimethylsilane, hexamethyldisilazane, triphenyl phosphate, pimelic nitrile, 2-ethoxy-2, 4, 6-pentafluoro-triphosphazene, 2-fluoropyridine, 1, 3-dioxane.
Still more preferably, the other additive may be 0.5% -5% of the total weight of the electrolyte, for example, 0.5%, 0.7%, 1.0%, 1.2%, 1.5%, 1.7%, 2%, 2.3%, 2.5%, 2.7%, 3%, 3.5%, 4%, 4.5%, etc.
Preferably, the organic solvent comprises one or more of a substituted or unsubstituted carbonate, a substituted or unsubstituted carboxylate, a substituted or unsubstituted ether, a substituted or unsubstituted sulfone, a substituted or unsubstituted sulfoxide, a substituted or unsubstituted benzene, the substituted group comprising a fluorine atom.
Further preferably, the organic solvent accounts for 70% -85% of the total weight of the electrolyte, for example, 70%, 75%, 80%, 85% and the like may be used.
According to some preferred embodiments, the organic solvent is two or more of fluoroethylene carbonate, difluoroethylene carbonate, trifluoroethyl carbonate, fluoroethylsulfone, tetrafluoroethyl tetrafluoropropyl ether, trifluoroethyl hexafluoropropyl ether, dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, methylethyl carbonate, ethylene glycol dimethyl ether, r-butyrolactone, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, propyl propionate, butyl propionate, methyl butyrate, ethyl butyrate, sulfolane, methyl ethyl sulfone, dimethyl sulfoxide, fluorobenzene.
Preferably, the lithium salt comprises a mixture of lithium hexafluorophosphate and at least one of lithium bis (trifluoromethylsulfonyl) imide, lithium bis (fluorosulfonyl) imide, lithium tetrafluoroborate, lithium dioxaborate, and lithium oxalyldifluoroborate.
Further preferably, the lithium salt may be 10% to 25% by weight, for example, 12%, 15%, 17%, 20%, 22%, 25% by weight, or the like, based on the total weight of the electrolyte.
Still more preferably, the lithium hexafluorophosphate accounts for 10-15% of the total weight of the electrolyte.
A second aspect of the invention provides a lithium ion battery comprising an electrolyte as described above.
Preferably, the lithium ion battery includes a positive electrode including a positive electrode active material including LiNi x Co y Mn 1-x-y O 2 Or LiCoO 2 Wherein the value of x is 0.3-1, and the value of y is 0-0.4; the negative electrode includes a negative electrode active material including metallic lithium, a metallic oxide, a metallic alloy, graphite, a modified carbon material, silicon oxide, or silicon oxycarbide.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the invention, the first additive is added into the electrolyte, so that the high-temperature circulation capacity of the lithium ion battery can be improved, the battery bulge after high-temperature laying is restrained, the capacity retention rate is improved, and the rate discharge at low temperature is improved; the first additive can be synergistic with other additives to further improve the high and low temperature performance of the lithium ion battery.
Detailed Description
Along with the expansion of application scenes of the lithium ion battery, the high-temperature circulation capacity of the lithium ion battery needs to be further improved, the swelling of the battery after high-temperature shelving is restrained, the capacity retention rate is improved, and the rate discharge at low temperature is improved. Accordingly, the present inventors have conducted intensive studies and a large number of experiments to obtain the present solution, which is further discussed below.
According to some preferred embodiments, a lithium ion battery electrolyte comprises an organic solvent, a lithium salt, and an additive comprising a first additive selected from one or more of the compounds of formula aWherein R1, R2 and R3 are each independently selected from a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, an alkenyl group, an alkynyl group, a cyano group, a phenyl group, a halophenyl group, a carbonyl group, a phenoxy group, a thiophenyl group, an amido group, a thiophen-2-ylsulfanyl group, or any two of the R1, R2 and R3 form a substituted or unsubstituted cyclic alkenyl group, and the substituted group includes a halogen atom and an amino group;
the second additive is selected from one or more of phosphorus-containing lithium fluoride salts;
the third additive is selected from one or more of compounds shown in structural formula C, wherein structural formula C isWherein R4 is a group containing one or more of borate, phosphate, phosphite, isocyanate, heterocyclic, amino and sulfate;
the first additive accounts for 0.5 to 2.0 percent of the total weight of the electrolyte; the second additive accounts for 0.1 to 2.0 percent of the total weight of the electrolyte; the third additive accounts for 0.1 to 2.0 percent of the total weight of the electrolyte.
Further, a lithium ion battery comprises the electrolyte. Specifically, the lithium ion battery comprises a shell, a battery core and a nonaqueous electrolyte, wherein the battery core and the nonaqueous electrolyte are contained in the shell, and the battery core comprises a positive electrode, a negative electrode and a diaphragm between the positive electrode and the negative electrode.
According to the invention, the positive electrode comprises a positive electrode current collector and a positive electrode material positioned on the surface of the positive electrode current collector, wherein the positive electrode material comprises a positive electrode active substance, a positive electrode conductive agent and a positive electrode binder, and the positive electrode active substance can be common LiNi x Co y Mn 1-x-y O 2 Common LiNi x Co y Al 1-x-y O 2 Ordinary LiCoO 2 High voltage LiNi x Co y Mn 1-x-y O 2 High voltage LiCoO 2 The method comprises the steps of carrying out a first treatment on the surface of the The positive electrode conductive agent is acetylene black or carbon nano tube; the positive electrode binder is polyvinylidene fluoride.
According to the invention, the negative electrode comprises a negative electrode current collector and a negative electrode material positioned on the surface of the negative electrode current collector, wherein the negative electrode material comprises a negative electrode active substance and a negative electrode binder, and the negative electrode material can also optionally comprise a negative electrode conductive agent which can be the same as or different from a positive electrode conductive agent and is a conductive agent commonly used in the field; the anode active material and the anode binder may be anode active materials and anode binders conventionally used in the art, and for example, the anode active material may be lithium metal, metal oxide, metal alloy, graphite, and modified carbon materials, silicon and its silicon oxide, silicon carbon or silicon oxygen carbon.
According to the present invention, the separator may be a separator conventionally used in the art, and the present invention is not particularly limited.
The scheme of the invention has at least the following advantages:
(1) The first additive provided by the invention can improve the high-temperature circulation capacity of the lithium ion battery to a certain extent, inhibit the battery from swelling after high-temperature placement, improve the capacity retention rate and improve the rate discharge at low temperature, can obtain the effect equivalent to that of the additive in the prior art, expands the types of the additive by using the first additive, and provides more possibility for the selection of the additive.
(2) According to the invention, the first additive, the second additive, the third additive and other additives are added into the electrolyte, so that the structural stability of the anode and cathode materials and the interface stability between the anode and the electrolyte and between the cathode and the electrolyte are improved through the synergistic effect of the additives in the charge and discharge process of the lithium ion battery, and the high-low temperature performance of the lithium ion battery is improved.
The invention is further described below with reference to examples. The present invention is not limited to the following examples. The implementation conditions adopted in the embodiments can be further adjusted according to different requirements of specific use, and the implementation conditions which are not noted are conventional conditions in the industry. The technical features of the various embodiments of the present invention may be combined with each other as long as they do not collide with each other.
Preparation of electrolyte:
specific examples and comparative examples in the present invention battery electrolytes were formulated in glove boxes according to the formulations described in tables 1 and 2. Among the substances mentioned in the table are Ethylene Carbonate (EC), dimethyl carbonate (DEC) and ethylmethyl carbonate (EMC), propylene Carbonate (PC), fluoroethylene carbonate (FEC), lithium difluorosulfimide (LiLSI), lithium oxalyldifluoroborate (LiODFB), 1, 3-Propane Sultone (PS), vinyl sulfate (DTD), lithium hexafluorophosphate (LiPF) 6 )；
A1 has the structural formula:
a2 has the structural formula:
a3 has the structural formula:
a4 has the structural formula:
a5 has the structural formula:
a6 has the structural formula:
a7 has the structural formula:
a8 has the structural formula:
b1 is lithium difluorophosphate (LiDFP); b2 is difluoro double oxalate lithium phosphate (LiDFOP); b3 is lithium tetrafluorooxalate phosphate (LiTFOP);
the structural formula of C1 is:
the structural formula of C2 is:
the structural formula of C3 is:
the structural formula of C4 is:
the structural formula of C5 is:
the structural formula of C6 is:
the structural formula of C7 is:
TABLE 1
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TABLE 2
Preparation of the battery:
the electrolytes obtained in examples 1 to 46 and comparative examples 1 to 12 were injected into the same batch of LiNi 0.6 Co 0.2 Mn 0.2 O 2 In a (NCM 622) ||siloxycarbon (420 mAh) polymer pouch battery, the following tests were performed, respectively:
1) The capacity retention rate L1% of the battery after charge and discharge cycle for 500 weeks (average value of discharge capacity after 500 weeks/discharge capacity before 5 weeks is 100) is tested at 45 ℃ under the conditions that the voltage is between 2.75 and 4.3V and the current is 1C;
2) Testing the battery full charge of 4.3V, after being left at 60 ℃ for 7 days, the battery bulge rate H% (thickness before being left-thickness after being left-thickness)/thickness before being left-100), the capacity retention rate L2% (discharge capacity after being left-thickness/discharge capacity before being left-thickness 100);
3) The capacity retention rate L3% of the charge-discharge cycle for 200 weeks (average value of discharge capacity after 200 weeks/discharge capacity before 5 weeks is 100) is tested when the voltage of the battery at low temperature of 0 ℃ is 2.75-4.3V and the current is 2C;
the experimental results are shown in table 3.
TABLE 3 Table 3
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Table 3 shows that in LiNi 0.6 Co 0.2 Mn 0.2 O 2 In the (NCM 622) silicon-oxygen-carbon (420 mAh) 1Ah polymer soft package battery, the use of the first additive can improve the high-low temperature performance of the lithium ion battery, and the use of the first additive and the second additive, the third additive and the like can further improve the high-temperature circulation, the high-temperature shelf performance and the low-temperature discharge of the battery.
The present invention has been described in detail with the purpose of enabling those skilled in the art to understand the contents of the present invention and to implement the same, but not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.

Claims (15)

1. The lithium ion battery electrolyte comprises an organic solvent, lithium salt and an additive, and is characterized in that: the additive comprises a first additive which,
the first additive is selected from one or more of compounds shown in a structural formula A, wherein the structural formula A isWherein R1, R2 and R3 are respectively and independently selected from hydrogen atom, halogen atom, substituted or unsubstituted alkyl, alkenyl and alkynyl with 1-6 carbon atoms, cyano, phenyl, halogenated phenyl, carbonyl, phenoxy, thiophenyl, amido, thiophene-2-thioyl or any two of R1, R2 and R3 form substituted or unsubstituted cyclic alkenyl, and the substituted group comprises halogen atom and amino.
2. The lithium ion battery electrolyte according to claim 1, wherein: each of R1, R2 and R3 is independently selected from a hydrogen atom, a substituted or unsubstituted alkyl group with 1-3 carbon atoms, a cyano group, a halogenated phenyl group, a carbonyl group with 2-6 carbon atoms, a thiophenyl group and a thiophene-2-ylsulfanyl group, or any two of R1, R2 and R3 form a substituted or unsubstituted cyclic alkenyl group with 3-6 carbon atoms, wherein the substituted group is selected from a halogen atom and an amino group, and the halogen atom is selected from one or more of fluorine, chlorine and bromine.
3. The lithium ion battery electrolyte according to claim 2, wherein: the first additive is selected from one or more of the following structural formulas:
4. the lithium ion battery electrolyte according to claim 1, wherein: the first additive accounts for 0.5 to 2.0 percent of the total weight of the electrolyte.
5. The lithium ion battery electrolyte according to claim 4, wherein: the first additive accounts for 0.9 to 1.5 percent of the total weight of the electrolyte.
6. The lithium ion battery electrolyte according to claim 1, wherein: the additive further comprises a second additive and a third additive, the second additive being selected from one or more of the phosphorus-containing lithium fluoride salts; the third additive is selected from one or more of compounds shown in structural formula C, wherein the structural formula C isWherein, R4 is a group containing one or more of borate, phosphate, phosphite, isocyanate, heterocyclic, amino and sulfate.
7. The lithium ion battery electrolyte according to claim 6, wherein: the second additive is selected from one or more of lithium difluorophosphate, lithium difluorobis oxalate phosphate and lithium tetrafluorooxalate phosphate;
the third additive is selected from one or more of the following structural formulas:
8. the lithium ion battery electrolyte according to claim 6 or 7, wherein: the second additive accounts for 0.1-2.0% of the total weight of the electrolyte; the third additive accounts for 0.1 to 2.0 percent of the total weight of the electrolyte.
9. The lithium ion battery electrolyte according to claim 8, wherein: the second additive accounts for 0.4% -1.0% of the total weight of the electrolyte; the third additive accounts for 0.4 to 1.0 percent of the total weight of the electrolyte.
10. The lithium ion battery electrolyte according to claim 1, wherein: the additive further comprises other additives selected from one or more of double bond-containing cyclic carbonates, halogen-containing cyclic carbonates, sulfonates, sulfates, sulfites, anhydrides, benzene compounds, fluorobenzene compounds, nitriles, phosphates, phosphites, boron compounds, amine compounds, silicon-containing compounds, heterocyclic compounds.
11. The lithium ion battery electrolyte according to claim 10, wherein: such other additives include one or more of ethylene carbonate, fluoroethylene carbonate, ethylene sulfate, methylene methane disulfonate, ethylene sulfite, 1, 3-propane sultone, biphenyl, succinic anhydride, glutaric anhydride, cyclohexylbenzene, t-butylbenzene, t-pentylbenzene, m-fluorotoluene, 3, 4-difluorotoluene, 4-bromo-2-fluoroanisole, p-fluorotoluene, p-xylene, 1, 2-dimethoxy-4-nitrobenzene, N-phenylmaleimide, pentafluorobenzether, 2, 5-di-t-butyl, 1, 4-dimethoxybenzene, adiponitrile, hexanetrinitrile, succinonitrile, 1,2, 3-tris (2-cyanoethoxy) propane, N-butylamine, ethanolamine, N-dicyclohexylcarbodiimide, N-diethyltrimethylsilane, hexamethyldisilazane, triphenyl phosphate, pimelide, 2-ethoxy-2, 4, 6-pentafluoroethyl phosphazene, 2-fluoropyridine, 1, 3-dioxane; and/or the number of the groups of groups,
the other additives account for 0.5 to 5 percent of the total weight of the electrolyte.
12. The lithium ion battery electrolyte according to claim 1, wherein: the organic solvent comprises one or more of substituted or unsubstituted carbonic ester, substituted or unsubstituted carboxylic ester, substituted or unsubstituted ether, substituted or unsubstituted sulfone, substituted or unsubstituted sulfoxide and substituted or unsubstituted benzene, wherein the substituted group comprises fluorine atoms, and the organic solvent accounts for 70-85% of the total weight of the electrolyte; and/or the number of the groups of groups,
the lithium salt comprises a mixture of lithium hexafluorophosphate and at least one of lithium bistrifluoromethylsulfonyl imide, lithium bistrifluorosulfonyl imide, lithium tetrafluoroborate, lithium dioxalate borate and lithium oxalato difluoroborate, and the lithium salt accounts for 10-25% of the total weight of the electrolyte.
13. The lithium ion battery electrolyte according to claim 12, wherein: the organic solvent is two or more of fluoroethylene carbonate, difluoroethylene carbonate, trifluoroethyl carbonate, fluoroethylsulfone, tetrafluoroethyl tetrafluoropropyl ether, trifluoroethyl hexafluoropropyl ether, dimethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, methyl ethyl carbonate, ethylene glycol dimethyl ether, r-butyrolactone, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, propyl propionate, butyl propionate, methyl butyrate, ethyl butyrate, sulfolane, methyl ethyl sulfone, dimethyl sulfoxide and fluorobenzene.
14. A lithium ion battery, characterized in that: the lithium ion battery comprising the electrolyte as defined in any one of claims 1 to 13.
15. The lithium ion battery of claim 14, wherein: the lithium ion battery comprises a positive electrode and a negative electrode, wherein the positive electrode comprises a positive electrode active material, and the positive electrode active material comprises LiNi x Co y Mn 1-x-y O 2 Or LiCoO 2 Wherein the value of x is 0.3-1, and the value of y is 0-0.4; the negative electrode includes a negative electrode active material including metallic lithium, a metallic oxide, a metallic alloy, graphite, a modified carbon material, silicon oxide, or silicon oxycarbide.
CN202210897724.5A 2022-07-28 2022-07-28 Lithium ion battery electrolyte and lithium ion battery Pending CN117525579A (en)

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