CN112310477A - Overcharge-preventing lithium ion battery electrolyte - Google Patents
Overcharge-preventing lithium ion battery electrolyte Download PDFInfo
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- CN112310477A CN112310477A CN201910710746.4A CN201910710746A CN112310477A CN 112310477 A CN112310477 A CN 112310477A CN 201910710746 A CN201910710746 A CN 201910710746A CN 112310477 A CN112310477 A CN 112310477A
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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
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
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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
- H01M2300/00—Electrolytes
- H01M2300/0088—Composites
- H01M2300/0091—Composites in the form of mixtures
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- 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
Abstract
The invention belongs to the technical field of lithium ion batteries, and discloses an overcharge-preventing lithium ion battery electrolyte. The invention discloses an overcharge-prevention lithium ion battery electrolyte, which comprises a nonaqueous organic solvent, a lithium salt and an additive, wherein the additive comprises a film-forming additive and a compound shown in a formula I:
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to an overcharge-preventing lithium ion battery electrolyte.
Background
The lithium ion battery has the advantages of high voltage and energy density, long cycle life, small self-discharge, no memory effect, environmental protection, no pollution and the like, and is widely applied to portable consumer electronics products at present. And along with the gradual reduction of the production cost, the cycle life, the reliability and other performances are further improved, and the method is also widely applied to the application fields of electric automobiles, energy storage and the like. However, the safety problem of lithium ion batteries is regarded as the biggest technical bottleneck that hinders their large-scale application. The reason is that the lithium ion battery generally adopts inflammable alkyl carbonate organic solution as electrolyte, the transition metal oxide serving as the anode has strong oxidizability in a charging state, and when a charger fails or a wrong charger is used, safety accidents such as smoke, fire and even explosion caused by overhigh temperature rise of the battery can be directly caused.
At present, the overcharge protection measures of lithium ion batteries mainly include the following measures: firstly, a current interruption device (such as CID in a cylindrical battery), a positive temperature coefficient thermistor (PTC) and the like are additionally arranged inside or outside the battery, secondly, a heat shutdown (thermal shutdown) isolating membrane or a ceramic coating isolating membrane and the like are adopted inside the battery, and thirdly, an overcharge-preventing additive is directly added into the battery to achieve the purpose of improving overcharge safety.
The overcharge accident is prevented by using the overcharge-preventing additive, and the overcharge-preventing additive has the characteristics of low cost, convenient operation and the like, however, although the effects of biphenyl, cyclohexylbenzene, toluene and the like which are commonly used at present are good in a voltage system of 4.2V or below, due to the fact that the oxidation potentials of biphenyl, cyclohexylbenzene, toluene and the like are not high (for example, the oxidation polymerization potential of biphenyl is about 4.54V), when the biphenyl, cyclohexylbenzene, toluene and the like are added into the voltage system of 4.35V or higher, the biphenyl, cyclohexylbenzene, toluene and the like can generate slow oxidation polymerization and hydrogen gas in the normal use process of the battery, and the hydrogen gas which is removed can cause the abnormal performance problems of shell swelling, gas expansion, rapid cycle capacity attenuation and.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an overcharge-resistant lithium ion battery electrolyte, which has better overcharge resistance and is very stable in a high-voltage system, solves the problems of battery bulging, gas expansion and rapid reduction of cycle capacity caused by oxidative polymerization gas generation of overcharge additives such as biphenyl, cyclohexylbenzene, toluene and the like in a high-voltage system of 4.35V or above in the prior art, and has excellent overcharge-resistant safety performance and cycle performance.
In order to achieve the purpose of the invention, the overcharge-proof lithium ion battery electrolyte comprises a nonaqueous organic solvent, a lithium salt and an additive, wherein the additive comprises an overcharge-proof additive shown in a formula I:
wherein R1, R2, R3, R4, R5 are each independently selected from any one of a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an alkyl group, an alkoxy group, a haloalkyl group and a haloalkoxy group.
Preferably, R1, R2, R3, R4 and R5 are each independently selected from any one of a hydrogen atom, a fluorine atom, a chlorine atom, an alkyl group and a halogenated alkoxy group.
Preferably, the overcharge-preventing additive shown in the formula I is 6-trifluoromethoxybenzathiazole, 2-methyl-6-trifluoromethoxybenzathiazole or 2-chloro-6-trifluoromethoxybenzathiazole, and the structural formulas of the three are as follows:
preferably, the addition amount of the overcharge-preventing additive accounts for 1.0-5.0% of the total mass of the electrolyte.
Preferably, the non-aqueous organic solvent is a mixture of two or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, propylene carbonate, ethylene carbonate, methyl propyl carbonate, ethyl propionate, propyl propionate, ethyl acetate, ethyl formate, propyl butyrate, tetrahydrofuran, dioxane, diethanol diethyl ether, and γ -butyrolactone in any ratio.
Preferably, the addition amount of the non-aqueous organic solvent accounts for 70.0-85.0% of the total mass of the lithium ion battery electrolyte.
Further preferably, the non-aqueous organic solvent comprises ethylene carbonate, propylene carbonate, propyl propionate and diethyl carbonate; more preferably, the ethylene carbonate, the propylene carbonate, the propyl propionate and the diethyl carbonate in the non-aqueous organic solvent are uniformly mixed according to the mass ratio of (15-25) to (10-20) to (35-45) to (20-30).
Preferably, the additive also comprises a film forming additive which is a mixture of any one or more of vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, vinyl sulfate and nitrile; more preferably, the addition amount of the film forming additive accounts for 3.0-15.0% of the total mass of the lithium ion battery electrolyte.
Preferably, the lithium salt is any one or a mixture of more of lithium hexafluorophosphate, lithium bis (oxalate) borate, lithium difluoro (oxalate) borate, lithium bis (fluorosulfonyl) imide, lithium tetrafluoroborate and lithium bis (trifluoromethanesulfonyl) imide; more preferably, the addition amount of the lithium salt accounts for 10.0-15.0% of the total mass of the lithium ion battery electrolyte.
As a preferred embodiment of the invention, the non-aqueous organic solvent in the electrolyte of the overcharge-proof lithium ion battery comprises ethylene carbonate, propylene carbonate, propyl propionate and diethyl carbonate, and the ethylene carbonate, the propylene carbonate, the propyl propionate and the diethyl carbonate are uniformly mixed according to the mass ratio of 20:15:40: 25; the lithium salt is lithium hexafluorophosphate accounting for 13.0-15.0% of the total mass of the lithium ion battery electrolyte, the additive comprises one of 6-trifluoromethoxybenzathiazole, 2-methyl-6-trifluoromethoxybenzathiazole or 2-chloro-6-trifluoromethoxybenzathiazole accounting for 2.0-4.0% of the total mass of the lithium ion battery electrolyte, fluoroethylene carbonate accounting for 5-7.0% of the total mass of the lithium ion battery electrolyte, 1, 3-propane sultone accounting for 2-4.0% of the total mass of the lithium ion battery electrolyte and a nitrile additive accounting for 2-4.0% of the total mass of the lithium ion battery electrolyte.
According to the invention, the overcharge-preventing additive shown in the structure of the formula I is added into the electrolyte system, so that the electrolyte has excellent overcharge-preventing performance, has very high stability within the normal working voltage range (3.0V-4.45V) of the battery, does not generate oxidative polymerization in the use process, and avoids the use of conventional overcharge-preventing additives such as biphenyl, cyclohexylbenzene, toluene and the like, thereby avoiding abnormal phenomena such as shell bulging, gas expansion, rapid cycle capacity attenuation and the like caused by the operation of the battery added with the conventional overcharge additive under the high voltage of 4.45V.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. It is to be understood that the following description is only illustrative of the present invention and is not to be construed as limiting the present invention.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
The indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the number clearly indicates the singular. Further, the technical features of the embodiments of the present invention may be combined with each other as long as they do not conflict with each other.
Comparative example 1
In a glove box (moisture is less than 10ppm, oxygen content is less than 1ppm) filled with argon, ethylene carbonate, propylene carbonate, propyl propionate and diethyl carbonate are uniformly mixed according to the mass ratio of EC: PC: PP: DEC ═ 20:15:40:25, fluoroethylene carbonate accounting for 6.0 percent of the total mass of the lithium ion battery electrolyte, 1, 3-propane sultone accounting for 3.0 percent of the total mass of the lithium ion battery electrolyte and nitrile accounting for 3.0 percent of the total mass of the lithium ion battery electrolyte are added into the mixed solution, and LiPF accounting for 14.0 percent of the total mass of the lithium ion battery electrolyte is slowly added into the mixed solution6And stirring until the solution is completely dissolved, thereby obtaining the electrolyte of the lithium ion battery of the comparative example 1.
Comparative example 2
In a glove box (moisture is less than 10ppm, oxygen content is less than 1ppm) filled with argon, ethylene carbonate, propylene carbonate, propyl propionate and diethyl carbonate are uniformly mixed according to the mass ratio of EC: PC: PP: DEC (20: 15:40: 25), Biphenyl (BP) accounting for 3.0% of the total mass of the lithium ion battery electrolyte, fluoroethylene carbonate accounting for 6.0% of the total mass of the lithium ion battery electrolyte, 1, 3-propane sultone accounting for 3.0% of the total mass of the lithium ion battery electrolyte and nitrile accounting for 3.0% of the total mass of the lithium ion battery electrolyte are added into the mixed solution, LiPF accounting for 14.0% of the total mass of the lithium ion battery electrolyte is slowly added into the mixed solution6And stirring until the solution is completely dissolved, thereby obtaining the electrolyte of the lithium ion battery of the comparative example 2.
Comparative example 3
In a glove box (moisture is less than 10ppm, oxygen content is less than 1ppm) filled with argon, ethylene carbonate, propylene carbonate, propyl propionate and diethyl carbonate are uniformly mixed according to the mass ratio of EC: PC: PP: DEC ═ 20:15:40:25, and Cyclohexylbenzene (CHB) accounting for 3.0% of the total mass of the lithium ion battery electrolyte is added into the mixed solution and accounting for the total mass of the lithium ion battery electrolyte6.0 percent of fluoroethylene carbonate, 1, 3-propane sultone accounting for 3.0 percent of the total mass of the lithium ion battery electrolyte and nitrile accounting for 3.0 percent of the total mass of the lithium ion battery electrolyte are slowly added into the mixed solution, and LiPF accounting for 14.0 percent of the total mass of the lithium ion battery electrolyte is slowly added into the mixed solution6And stirring until the solution is completely dissolved, thereby obtaining the electrolyte of the lithium ion battery of the comparative example 3.
Comparative example 4
In a glove box (moisture is less than 10ppm, oxygen content is less than 1ppm) filled with argon, ethylene carbonate, propylene carbonate, propyl propionate and diethyl carbonate are uniformly mixed according to the mass ratio of EC: PC: PP: DEC (20: 15:40: 25), Toluene (TOL) accounting for 3.0% of the total mass of the lithium ion battery electrolyte, 6.0% of fluoroethylene carbonate, 1, 3-propane sultone accounting for 3.0% of the total mass of the lithium ion battery electrolyte and nitrile accounting for 3.0% of the total mass of the lithium ion battery electrolyte are added into the mixed solution, and LiPF accounting for 14.0% of the total mass of the lithium ion battery electrolyte is slowly added into the mixed solution6And stirring until the solution is completely dissolved, thereby obtaining the electrolyte of the lithium ion battery of the comparative example 4.
Example 1
In a glove box (moisture is less than 10ppm, oxygen content is less than 1ppm) filled with argon, ethylene carbonate, propylene carbonate, propyl propionate and diethyl carbonate are uniformly mixed according to the mass ratio of EC: PC: PP: DEC (20: 15:40: 25), 6-trifluoromethoxybenzothiazole accounting for 3.0% of the total mass of the lithium ion battery electrolyte, fluoroethylene carbonate accounting for 6.0% of the total mass of the lithium ion battery electrolyte, 1, 3-propane sultone accounting for 3.0% of the total mass of the lithium ion battery electrolyte and nitrile accounting for 3.0% of the total mass of the lithium ion battery electrolyte are added into the mixed solution, and LiPF accounting for 14.0% of the total mass of the lithium ion battery electrolyte is slowly added into the mixed solution6And stirred until it was completely dissolved, to obtain the electrolyte for lithium ion battery of example 1.
Example 2
In a glove box (moisture is less than 10ppm, oxygen content is less than 1ppm) filled with argon, ethylene carbonate, propylene carbonate, propyl propionate and diethyl carbonate are uniformly mixed according to the mass ratio of EC: PC: PP: DEC (20: 15:40: 25), and the mixture solution is added to account for the total mass of the lithium ion battery electrolyte3.0 percent of 2-methyl-6-trifluoromethoxybenzathiazole, 6.0 percent of fluoroethylene carbonate, 3.0 percent of 1, 3-propane sultone and 3.0 percent of nitrile, wherein the fluoroethylene carbonate accounts for 6.0 percent of the total mass of the lithium ion battery electrolyte, the 1, 3-propane sultone accounts for 3.0 percent of the total mass of the lithium ion battery electrolyte, and LiPF accounting for 14.0 percent of the total mass of the lithium ion battery electrolyte is slowly added into the mixed solution6And stirred until it was completely dissolved, to obtain the electrolyte for lithium ion battery of example 2.
Example 3
In a glove box (moisture is less than 10ppm, oxygen content is less than 1ppm) filled with argon, ethylene carbonate, propylene carbonate, propyl propionate and diethyl carbonate are uniformly mixed according to the mass ratio of EC: PC: PP: DEC ═ 20:15:40:25, 2-chloro-6-trifluoromethoxybenzothiazole accounting for 3.0% of the total mass of the lithium ion battery electrolyte, fluoroethylene carbonate accounting for 6.0% of the total mass of the lithium ion battery electrolyte, 1, 3-propane sultone accounting for 3.0% of the total mass of the lithium ion battery electrolyte and nitrile accounting for 3.0% of the total mass of the lithium ion battery electrolyte are added into the mixed solution, and LiPF accounting for 14.0% of the total mass of the lithium ion battery electrolyte is slowly added into the mixed solution6And stirred until it was completely dissolved, to obtain the electrolyte for lithium ion battery of example 3.
Effect testing
The lithium ion electrolytes prepared in comparative examples 1 to 4 and examples 1 to 3 were respectively injected with lithium cobaltate (LiCoO) as a positive electrode active material2And 4.45V), and in a soft package lithium ion battery with graphite as a negative active material, the lithium ion battery to be tested is obtained after the battery after liquid injection is subjected to the process steps of packaging, laying aside, formation, aging, secondary packaging, capacity grading and the like.
And (3) normal temperature 1C cycle test: the batteries obtained in comparative examples 1 to 4 and examples 1 to 3 were charged to a limiting voltage of 4.45V at a current of 1.0C, then charged to a limiting current of 0.02C at a constant voltage, left to stand for 5min, then discharged to a limiting voltage of 3.0V at a current of 1.0C, left to stand for 5min, and cycled for 500 weeks according to the above procedure, and the discharge capacity retention rate and the thickness expansion data of the battery when the cycle was 500 weeks are shown in Table 1.
And (3) high-temperature storage test: the batteries obtained in comparative examples 1 to 4 and examples 1 to 3 were charged to a limiting voltage of 4.45V at a current of 1.0C, then charged to a cutoff current of 0.02C at a constant voltage, left to stand for 5min, and then discharged to a cutoff voltage of 3.0V at 1.0C, and the discharged capacity was regarded as an initial capacity; charging to 4.45V limit voltage with 1.0C current, changing into constant voltage charging to cutoff current of 0.02C, standing for 2h in an open circuit, and measuring initial thickness; storing the battery cell at 60 +/-2 ℃ for 7 days in an open circuit manner, taking out the battery cell, immediately testing the thermal state thickness of the battery, standing at room temperature for 2h, and testing the internal resistance of the battery after cooling; and then, the battery cell is discharged at 1.0C, and then is charged and discharged at 1.0C, and the residual capacity and the recovery capacity are tested. The results of calculating the change rate of the thickness, residual capacity and recovered capacity measured before and after the storage of the battery are shown in table 1.
3C/10V overcharge safety test: the batteries obtained in comparative examples 1 to 4 and examples 1 to 3 were charged to a 10V limiting voltage at a current of 3.0C and then the charging was stopped, and 1h was observed to see whether the batteries were on fire or exploded.
Table 1 comparative and example cell performance test results
As can be seen from Table 1, in comparative example 1, since the overcharge prevention additive was not added, the battery was ignited when the 3C/10V overcharge test was performed, failing to pass the test. In comparative examples 2 to 4, owing to the addition of the conventional biphenyl, cyclohexylbenzene and toluene overcharge prevention additives, the overcharge prevention performance of the batteries is remarkably improved and passes the 3C/10V overcharge test, but the problems of low cycle capacity retention rate and large battery thickness expansion after cycle and high-temperature storage exist, and the requirements of practical production and application cannot be met.
The electrolyte of the embodiment 1-3 is applied to a 4.45V high-voltage positive electrode system lithium ion battery, and the overcharge safety performance, the cycle performance and the high-temperature storage performance of 3C/10V are well considered.
In conclusion, the overcharge-preventing additive shown in the structural formula I is added into the electrolyte, so that the lithium ion battery has excellent overcharge-preventing safety performance and electrochemical performance within the voltage range of 3.0V-4.45V, and has wide application prospect in a high-voltage positive electrode system battery of 4.35-4.45V.
It will be understood by those skilled in the art that the foregoing is merely exemplary of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An overcharge-prevention lithium ion battery electrolyte, which comprises a nonaqueous organic solvent, a lithium salt and an additive, wherein the additive comprises an overcharge-prevention additive represented by formula I:
wherein R1, R2, R3, R4, R5 are each independently selected from any one of a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an alkyl group, an alkoxy group, a haloalkyl group and a haloalkoxy group.
2. The overcharge-resistant lithium ion battery electrolyte solution of claim 1, wherein R1, R2, R3, R4 and R5 are each independently selected from any one of a hydrogen atom, a fluorine atom, a chlorine atom, an alkyl group and a haloalkoxy group.
3. The overcharge-prevention lithium ion battery electrolyte solution of claim 1 or 2, wherein the overcharge-prevention additive represented by formula i is 6-trifluoromethoxybenzathiazole, 2-methyl-6-trifluoromethoxybenzathiazole or 2-chloro-6-trifluoromethoxybenzathiazole.
4. The overcharge-prevention lithium ion battery electrolyte solution of claim 3, wherein the addition amount of the overcharge-prevention additive accounts for 1.0-5.0% of the total mass of the electrolyte solution.
5. The overcharge-preventing lithium ion battery electrolyte solution of claim 1, wherein the nonaqueous organic solvent is a mixture of two or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, propylene carbonate, ethylene carbonate, methyl propyl carbonate, ethyl propionate, propyl propionate, ethyl acetate, ethyl formate, propyl butyrate, tetrahydrofuran, dioxane, diethanol diethyl ether, and γ -butyrolactone mixed in any ratio.
6. The overcharge-prevention lithium ion battery electrolyte solution of claim 1 or 5, wherein the addition amount of the non-aqueous organic solvent accounts for 70.0-85.0% of the total mass of the lithium ion battery electrolyte solution.
7. The overcharge-resistant lithium ion battery electrolyte of claim 5 wherein the nonaqueous organic solvent comprises ethylene carbonate, propylene carbonate, propyl propionate and diethyl carbonate; preferably, the ethylene carbonate, the propylene carbonate, the propyl propionate and the diethyl carbonate in the non-aqueous organic solvent are uniformly mixed according to the mass ratio of (15-25) to (10-20) to (35-45) to (20-30).
8. The overcharge-prevention lithium ion battery electrolyte solution of claim 1, wherein the additive further comprises a film-forming additive, and the film-forming additive is a mixture of any one or more of vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, vinyl sulfate, and nitrile; preferably, the addition amount of the film forming additive accounts for 3.0-15.0% of the total mass of the lithium ion battery electrolyte.
9. The overcharge-prevention lithium ion battery electrolyte of claim 1, wherein the lithium salt is any one or a mixture of more of lithium hexafluorophosphate, lithium bis (oxalate) borate, lithium difluoro (oxalate) borate, lithium bis (fluorosulfonyl) imide, lithium tetrafluoroborate and lithium bis (trifluoromethanesulfonyl) imide; preferably, the addition amount of the lithium salt accounts for 10.0-15.0% of the total mass of the lithium ion battery electrolyte.
10. The overcharge-prevention lithium ion battery electrolyte solution of claim 1, wherein the nonaqueous organic solvent in the overcharge-prevention lithium ion battery electrolyte solution comprises ethylene carbonate, propylene carbonate, propyl propionate and diethyl carbonate, and the ethylene carbonate, the propylene carbonate, the propyl propionate and the diethyl carbonate are uniformly mixed in a mass ratio of 20:15:40: 25; the lithium salt is lithium hexafluorophosphate accounting for 13.0-15.0% of the total mass of the lithium ion battery electrolyte, the additive comprises one of 6-trifluoromethoxybenzathiazole, 2-methyl-6-trifluoromethoxybenzathiazole or 2-chloro-6-trifluoromethoxybenzathiazole accounting for 2.0-4.0% of the total mass of the lithium ion battery electrolyte, fluoroethylene carbonate accounting for 5-7.0% of the total mass of the lithium ion battery electrolyte, 1, 3-propane sultone accounting for 2-4.0% of the total mass of the lithium ion battery electrolyte and a nitrile additive accounting for 2-4.0% of the total mass of the lithium ion battery electrolyte.
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| CN112838270A (en) * | 2021-03-18 | 2021-05-25 | 合肥国轩高科动力能源有限公司 | Electrolyte additive for improving high-temperature flatulence of battery, electrolyte and lithium ion battery containing electrolyte |
| CN113851714A (en) * | 2021-09-18 | 2021-12-28 | 蜂巢能源科技有限公司 | Electrolyte and application thereof |
| CN114284561A (en) * | 2022-01-05 | 2022-04-05 | 合肥国轩高科动力能源有限公司 | Electrolyte overcharge-preventing additive, electrolyte containing additive and lithium secondary battery |
| CN116365026A (en) * | 2021-12-28 | 2023-06-30 | 张家港市国泰华荣化工新材料有限公司 | Nonaqueous electrolyte and lithium ion battery containing same |
| CN116404248A (en) * | 2021-12-28 | 2023-07-07 | 张家港市国泰华荣化工新材料有限公司 | Overcharge-preventing electrolyte and lithium ion battery comprising same |
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| CN113851714A (en) * | 2021-09-18 | 2021-12-28 | 蜂巢能源科技有限公司 | Electrolyte and application thereof |
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