CN111029655A - Lithium ion battery electrolyte and lithium ion battery containing same - Google Patents

Lithium ion battery electrolyte and lithium ion battery containing same Download PDF

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CN111029655A
CN111029655A CN201911326984.1A CN201911326984A CN111029655A CN 111029655 A CN111029655 A CN 111029655A CN 201911326984 A CN201911326984 A CN 201911326984A CN 111029655 A CN111029655 A CN 111029655A
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ion battery
lithium ion
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杨艳茹
郭力
朱学全
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Shanshan Advanced Materials Quzhou 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
    • 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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Abstract

The invention discloses a lithium ion battery electrolyte, which comprises a lithium salt, a non-aqueous solvent and an additive, wherein the additive comprises the following components in percentage by mass in the lithium ion battery electrolyte: 0.1-5% of aryl sulfur-containing ester compound, 0.1-3% of boron-containing lithium salt and 0.5-5% of negative electrode film-forming additive. The invention also discloses a lithium ion battery comprising the anode, the cathode, the diaphragm and the lithium ion battery electrolyte. The lithium ion battery has the advantages of long cycle life and good high-low temperature performance.

Description

Lithium ion battery electrolyte and lithium ion battery containing same
Technical Field
The invention relates to the technical field of batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery containing the same.
Background
The development of lithium ion batteries has attracted considerable interest due to the high energy density of secondary batteries. However, in order to meet the requirements of Electric Vehicles (EVS), it is necessary to develop a negative electrode and a positive electrode material having higher energy density than those of conventional lithium ion batteries, and thus a high nickel ternary positive electrode material is receiving much attention. The gram capacity of the ternary material LiNi1-x-y-zCoxMnyAlzO2 is gradually increased along with the increase of the nickel content in the ternary material LiNi1-x-y-zCoxMnyAlzO2 (x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, and x + y + z. On one hand, however, the phenomenon of mixed discharging of cations is easy to occur when the nickel content is increased in the charging and discharging processes, and transition metal ions in the positive electrode can also enter into electrolyte after lithium removal lattice in the reaction, so that the oxidation and decomposition of the electrolyte are catalyzed, and a passivation film on the surface of an electrode material is damaged, thereby affecting the service life of the electrode material; on the other hand, the high-nickel ternary material has the self oxygen release condition, the damage of metal ions and active hydrogen in the battery to a battery system is accelerated in a high-temperature environment, and the problems of battery ballooning, thermal runaway and the like are easily caused. Moreover, the requirement on environment and process in the preparation process of the high-nickel material is high, trace moisture in a battery system is difficult to remove, the cycle life of the battery is shortened, and particularly after the high-low temperature performance and the cycle life are hardly considered after the high-nickel material is matched with a silicon-carbon negative electrode which is easy to expand in volume.
Currently, the high and low temperature performance and cycle life of lithium ion batteries are often improved by adding additives to the electrolyte.
For example, chinese patent publication No. CN109888386A discloses an electrolyte for a lithium ion battery and a lithium ion battery containing the same. The lithium ion battery electrolyte comprises lithium salt, an organic solvent and an additive, wherein the additive comprises sulfur-containing compounds M and N as additives. The compound M is a chain sulfur-containing ester structure. The additive M can participate in the formation of a passivation film on positive and negative electrode interfaces, the high-temperature performance is improved, the gas generation of the battery is inhibited, the additive N has good effects of improving the cycle performance of the battery and adjusting the impedance, the cycle performance and the storage performance of a battery system can be optimized through the combined use of the compound M and the compound N, the battery system has low impedance, and the comprehensive effect of considering the high-temperature and low-temperature performance of the battery is achieved. The disadvantages are unstable chemical property of sulfide N, high requirement for storage and use environment, and poor acidity and chromaticity performance.
For another example, chinese patent publication No. CN109428112A discloses a lithium ion battery and an electrolyte thereof, wherein the electrolyte includes a non-aqueous organic solvent, a lithium salt and an additive, wherein the non-aqueous organic solvent contains a methyl ester compound a, the additive includes an additive B, a silicon oxygen thioester compound and an additive C, the additive C is at least one selected from a lithium disulfonate compound containing an ether bond and a lithium dithionate compound containing an ether bond, and the methyl ester compound a, the additive B and the additive C in the lithium ion battery and the electrolyte thereof cooperate with each other to improve the overcharge resistance and the cycle performance of the lithium ion battery and to improve the safety performance of the battery. The disadvantage is that the lithium ion battery has poor high and low temperature performance.
Disclosure of Invention
In view of the problems of the prior art, the invention aims to provide an electrolyte of a lithium ion battery and the lithium ion battery containing the electrolyte. The invention effectively solves the problems of short cycle life and poor high-low temperature performance of the lithium ion battery.
In order to achieve the purpose, the invention adopts the technical scheme that: the lithium ion battery electrolyte comprises a lithium salt, a non-aqueous solvent and an additive, wherein the additive comprises the following components in percentage by mass in the lithium ion battery electrolyte:
0.1 to 5 percent of aryl sulfur-containing ester compounds
0.1 to 3 percent of boron-containing lithium salt
0.5 to 5 percent of negative film forming additive
As a preferred embodiment of the present invention, the aryl sulfur ester compound has the following structural formula:
Figure BDA0002328628940000021
wherein R is1，R2Each independently selected from hydrogen atom, oxygen atom, fluorine atom, alkyl with 1-4 carbon atoms, alkenyl, alkynyl, nitrile group, fluoroalkyl, oxyalkyl and aryl, and R1，R2At least one aryl group.
More preferably, the aryl sulfur ester compounds are one or more compounds represented by the following structural formula:
Figure BDA0002328628940000031
as a preferred embodiment of the present invention, the boron-containing lithium salt is preferably lithium bis (oxalato) borate (LiBOB), lithium difluoro (oxalato) borate (LiDFOB), lithium tetrafluoroborate (LiBF)4)、LiBF2(CF3)2、LiBF2(C2F5)2One or more of (a). The boron-containing lithium salt is more preferably one of lithium bis (oxalato) borate, lithium difluoro (oxalato) borate and lithium tetrafluoroborate.
As a preferred embodiment of the present invention, the negative electrode film-forming additive is preferably one or more of VC (vinylene carbonate), fluoroethylene carbonate (FEC), vinyl sulfate (DTD), tris (trimethyl) silane borate (TMSB), tris (trimethyl) silane phosphate (TMSP), lithium bistrifluoromethylsulfonyl imide (LiTFSI), and lithium difluorophosphate (LiDFP).
In a preferred embodiment of the present invention, the lithium salt is preferably lithium hexafluorophosphate (LiPF)6) One or more of lithium hexafluoroarsenate, lithium perchlorate, lithium tetrafluoroborate, lithium bis (oxalato) borate, lithium tris (oxalato) phosphate, lithium difluoro (oxalato) borate, lithium bis (fluorosulfonato) imide (LiFSI), lithium bis (trifluoromethanesulfonyl) imide (LiTFSI), lithium difluoro (ophospho), lithium tetrafluoro (ophosphate), and lithium difluoro (difluorobis (oxalato) phosphate.
In a preferred embodiment of the present invention, the mass percentage of the lithium salt in the lithium ion battery electrolyte is preferably 12.5 to 17%, and the mass percentage of the lithium salt in the lithium ion battery electrolyte is more preferably 12.5%.
The non-aqueous solvent in the present invention may be one or more selected from cyclic carbonates, chain carbonates, carboxylic esters, and fluorinated solvents. The cyclic carbonate is preferably one or more of Ethylene Carbonate (EC), Propylene Carbonate (PC) and Butylene Carbonate (BC); the chain carbonate is preferably one or more of dimethyl carbonate (DMC), Ethyl Methyl Carbonate (EMC), diethyl carbonate (DEC), dipropyl carbonate (DPC) and Methyl Propyl Carbonate (MPC); the carboxylic ester is preferably one or more of ethyl formate (MA), propyl formate (MP), methyl acetate (MP), Ethyl Acetate (EA), Propyl Acetate (PA), ethyl Propionate (PE), Propyl Propionate (PP) and ethyl n-butyrate (EB); the fluorinated solvent is preferably one or more of fluoroethylene carbonate (FEC), difluoroethylene carbonate (DFEC), dimethyl Fluorocarbonate (FDMC), fluoroethylene carbonate (FEMC), fluoropropylene carbonate (FPC), 1,2, 2-tetrafluoroethyl-2, 2,3, 3-tetrafluoropropyl ether (D2), ethyl Fluorocarbonate (FMA) and ethyl Fluoroacetate (FEA) Fluoropropylformate (FMP). The nonaqueous solvent is more preferably a mixture of Ethylene Carbonate (EC), Propylene Carbonate (PC), diethyl carbonate (DEC), Ethyl Methyl Carbonate (EMC).
The invention also provides a lithium ion battery which comprises a positive electrode, a negative electrode, a diaphragm and the lithium ion battery electrolyte.
The positive pole piece of the lithium ion battery comprises a positive pole current collector and a positive pole diaphragm on the surface of the positive pole current collector, wherein the positive pole diaphragm comprises a positive pole active substance, a conductive agent and a binder; preferably, the positive electrode active material is LiNi1-x-y-zCoxMnyAlzO2Lithium nickel manganese oxide, lithium cobalt oxide, lithium-rich manganese-based solid solution or lithium manganese oxide, wherein: x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, and x + y + z is more than or equal to 0 and less than or equal to 1; more preferably, the positive electrode material is a high nickel material.
The negative active material of the lithium ion battery can be selected from artificial graphite, coated natural graphite, a silicon-carbon negative electrode and a silicon negative electrode; preferably, the battery is in the form of a cylinder, an aluminum shell, a plastic shell or a soft package shell.
The upper cut-off voltage of the lithium ion battery of the present invention is preferably 4.2 to 5V.
Compared with the prior art, the invention has the following advantages:
in the lithium ion battery electrolyte, the HOMO energy of the aryl sulfur-containing compound is lower, the oxidation reaction is easy to occur in preference to a non-aqueous solvent during charging, and an oxidation product is deposited on the surface of the anode to form a compact CEI film, so that the thermal stability is good, on one hand, the corrosion of HF (hydrogen fluoride) generated by the thermal decomposition and hydrolysis of lithium hexafluorophosphate on an anode material is reduced, the dissolution of transition metal ions such as cobalt, nickel and the like and the deposition on the cathode are inhibited, and the room-temperature cycle performance is improved; on the other hand, the passive film reduces the loss of active substances and interface side reaction, and prevents the catalytic decomposition and gas generation expansion of the non-aqueous solvent by the transition metal elements dissolved out in the high-temperature environment.
The LUMO energy of the boron-containing lithium salt is low, reduction reaction occurs on the surface of graphite during first charge and discharge, SEI film with protection is formed, further decomposition of a non-aqueous solvent is inhibited, the surface of a graphite cathode/electrolyte is stabilized, and the circulating reversible capacity is improved.
The negative electrode film-forming additive is subjected to reductive decomposition before the non-aqueous solvent, the SEI film impedance is reduced by adjusting the composition of the SEI film, and the cycle performance and the low-temperature cycle performance of the high-nickel lithium battery are improved.
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 below with reference to examples, it being understood that the following description is only for the purpose of explaining the present invention and is not intended to limit the present invention.
The aryl sulfur compounds in the examples and comparative examples of the present invention have the following structural formulae:
compound 1 structural formula:
Figure BDA0002328628940000051
compound 2 structural formula:
Figure BDA0002328628940000052
compound 3 structural formula:
Figure BDA0002328628940000053
compound 4 structural formula:
Figure BDA0002328628940000054
compound 5 structural formula:
Figure BDA0002328628940000055
compound 6 structural formula:
Figure BDA0002328628940000056
compound 7 structural formula:
Figure BDA0002328628940000061
compound 8 structural formula:
Figure BDA0002328628940000062
compound 9 structural formula:
Figure BDA0002328628940000063
compound 10 structural formula:
Figure BDA0002328628940000064
example 1
Preparing an electrolyte:
uniformly mixing Ethylene Carbonate (EC), Propylene Carbonate (PC), diethyl carbonate (DEC) and Ethyl Methyl Carbonate (EMC) in a glove box filled with argon (the oxygen content is less than or equal to 1ppm and the water content is less than or equal to 1ppm) according to the volume ratio of 30:10:10:50 to obtain a mixed solution, adding lithium salt LiPF into the mixed solution6Dissolving to prepare the LiPF-containing material6To a solution containing LiPF6Compound 1, LiBOB and VC (vinylene carbonate) were added to the solution of (a) and stirred to be completely dissolved, thereby obtaining an electrolytic solution of example 1. The mass percent of the lithium salt in the electrolyte is 12.5%, the mass percent of the compound 1 in the electrolyte is 0.1%, the mass percent of the LiBOB in the electrolyte is 1%, and the mass percent of the VC in the electrolyte is 1%. The electrolyte formulation is shown in table 1.
Examples 2 to 18
Examples 2-18 are also specific examples of electrolyte preparation, and the parameters and preparation method are the same as in example 1, except for the parameters in Table 1. The electrolyte formulation is shown in table 1.
Comparative examples 1 to 8
In comparative examples 1 to 8, the parameters and preparation method were the same as in example 1 except for the parameters shown in Table 1. The electrolyte formulation is shown in table 1.
TABLE 1 electrolyte compositions of examples 1 to 18 and comparative examples 1 to 8
Figure BDA0002328628940000071
Figure BDA0002328628940000081
Figure BDA0002328628940000091
Note: the concentration of the lithium salt is the mass percentage in the electrolyte;
the content of each component in the additive is the mass percentage in the electrolyte;
the proportion of each component in the non-aqueous solvent is volume ratio.
Lithium ion battery performance testing
Preparing a lithium ion battery:
LiNi as positive electrode active material0.8Co0.1Mn0.1O2The conductive agent acetylene black and the binder polyvinylidene fluoride are fully stirred and uniformly mixed in an N-methyl pyrrolidone system according to the mass ratio of 95:3:2, and then coated on an aluminum foil to be dried and cold-pressed, so that the positive plate is obtained.
And (3) fully stirring and uniformly mixing a negative active material AG, a conductive agent super carbon black, a thickening agent sodium carboxymethyl cellulose and a binder styrene butadiene rubber in a deionized water solvent system according to a mass ratio of 95:1:2:2, coating the mixture on a copper foil, drying and cold pressing to obtain the negative plate.
Polyethylene is used as a base film, and a nano aluminum oxide coating is coated on the base film to be used as a diaphragm.
And stacking the positive plate, the diaphragm and the negative plate in sequence to enable the diaphragm to be positioned between the positive plate and the negative plate to play an isolation role, and winding to obtain the bare cell. Placing the bare cell in an outer package, injecting the electrolyte prepared in each embodiment and comparative example, carrying out procedures of packaging and placing, formation, aging, secondary packaging, capacity grading and the like to obtain the NCM811/AG lithium ion battery, and carrying out performance test, wherein the results are shown in Table 2:
(1) and (3) testing the normal-temperature cycle performance: at 25 ℃, the formed lithium ion battery is charged to 4.2V according to a constant current and a constant voltage of 1C, the current is cut off to 0.02C, and then the lithium ion battery is discharged to 3.0V according to a constant current of 1C. The capacity retention rate was calculated at 1000 cycles after 1000 cycles of charge/discharge. The calculation formula is as follows:
capacity retention at 1000 weeks was 1000-week-cycle discharge capacity/first-week-cycle discharge capacity × 100%.
(2) High temperature storage performance at 60 ℃: the cell was charged and discharged once at room temperature at 0.5C, the current was cut off at 0.02C and the initial capacity was recorded. Fully filling the battery at a constant current and a constant voltage of 0.5C, and testing the initial thickness and the initial internal resistance of the battery; storing the fully charged battery in a constant temperature environment of 60 ℃ for 7 days, testing the thermal thickness of the battery, and calculating the thermal state expansion rate; and (5) after the battery is cooled to the normal temperature for 6 hours, testing the cold thickness, the voltage and the internal resistance, discharging to 3.0V according to 0.5C, recording the residual capacity of the battery, and calculating the residual rate of the capacity of the battery. The calculation formula is as follows:
the thermal state expansion ratio (%) of the battery is (thermal thickness-initial thickness)/initial thickness × 100%;
capacity remaining rate (%) (initial discharge capacity-discharge capacity after storage)/initial discharge capacity
(3) And (3) testing the low-temperature cycle performance: at the temperature of minus 20 ℃, the formed lithium ion battery is charged to 4.2V according to a constant current and a constant voltage of 0.3C, the current is cut off to be 0.02C, and then the lithium ion battery is discharged to 3.0V according to a constant current of 0.5C. The capacity retention rate at the 80 th cycle was calculated after 80 cycles of charge/discharge. The calculation formula is as follows:
capacity retention at 80 th week ═ cycle discharge capacity at 80 th week/cycle discharge capacity at first week × 100%.
TABLE 2 results of cell Performance test of examples 1 to 18 and comparative examples 1 to 8
Figure BDA0002328628940000101
Figure BDA0002328628940000111
Comparative example 1 and comparative example 2 were compared for LiNi0.8Co0.1Mn0.1O2The LUMO energy of the boron-containing lithium salt is low, reduction reaction occurs on the surface of graphite during first charge and discharge to participate in SEI film formation with a protection effect, further decomposition of a solvent is inhibited, the graphite cathode/electrolyte surface is stabilized, and the circulating reversible capacity is improved. The conventional negative electrode film-forming additive is subjected to reductive decomposition in advance of a solvent, and the SEI film impedance is reduced and the cycle performance and the low-temperature cycle performance of the high-nickel lithium battery are improved by adjusting the composition of the SEI film. Therefore, the capacity retention rate of the battery of comparative example 2, to which the boron-containing lithium salt and the negative film-forming additive were simultaneously added, was improved by about 30% at room temperature cycle for 1000 cycles.
However, in comparative example 2, the thermal state expansion rate reached 35.5%, indicating that these two additives could not suppress high-temperature gas generation and the high-temperature storage performance of the battery could not be ensured. With the embodiments 1-18, the aryl sulfur-containing compound has low HOMO energy, is easy to generate oxidation reaction in preference to a solvent during charging, and the oxidation product is deposited on the surface of the anode to form a compact CEI film, so that the thermal stability is good, on one hand, the corrosion of HF (hydrogen fluoride) generated by the thermal decomposition and hydrolysis of lithium hexafluorophosphate on an anode material is reduced, the dissolution of transition metal ions such as cobalt and nickel and the deposition on a cathode are inhibited, and the room-temperature cycle performance is improved; on the other hand, the passive film reduces the loss of active substances and interface side reaction, and prevents the catalytic decomposition and gas generation expansion of the solvent by the dissolved transition metal elements in a high-temperature environment.
Compared with the comparative example 2 only added with the boron-containing lithium salt and the negative film-forming additive, the examples 1 to 18 also show obvious performance advantages, which shows that the components of the SEI films on the surfaces of the positive and negative electrodes are comprehensively adjusted through the combined action of the aryl sulfur-containing ester compound and the boron-containing lithium salt (examples 1 to 18), so that LiNi is ensured0.8Co0.1Mn0.1O2The long-cycle use requirement of AG battery system.
In comparative examples 3-4, 3 additives were added at the same time, but compared with examples 1-18, the battery in comparative example 3, which was stored at 60 ℃ for 7 days, produced gas with a lower capacity residual rate, presumably due to the fact that the aryl sulfur ester compound was added too little and did not have an obvious positive electrode protection effect, but due to the fact that the aryl sulfur ester compound was added too much, the impedance was too high, and the cycle life was degraded and the low-temperature cycle capacity retention rate was reduced. Similarly, in comparison with examples 1 to 18, in comparative examples 5 to 8, in order to obtain better battery performance, the addition amounts of the aryl sulfur-containing ester compound, the boron-containing lithium salt, and the negative electrode film-forming additive need to be controlled within appropriate ranges to balance the requirements of the battery on normal temperature cycle and high and low temperatures.
In summary, the high nickel lithium ion battery of the present invention improves the electrode/electrolyte interface by using the electrolyte containing a proper amount of aryl sulfur-containing ester compound, boron-containing lithium salt and negative electrode film-forming additive, and ensures the long cycle life and high and low temperature performance of the high nickel lithium ion battery.
The above is a detailed description of some embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations or alterations without departing from the spirit or scope of the present invention should be considered within the scope of the present invention.

Claims (10)

1. The lithium ion battery electrolyte comprises a lithium salt, a non-aqueous solvent and an additive, and is characterized in that the additive comprises the following components in percentage by mass in the lithium ion battery electrolyte:
0.1 to 5 percent of aryl sulfur-containing ester compounds
0.1 to 3 percent of boron-containing lithium salt
0.5-5% of negative film forming additive.
2. The lithium ion battery electrolyte of claim 1, wherein the aryl sulfur ester compound has the following structural formula:
Figure FDA0002328628930000011
wherein R is1，R2Are respectively independentIs selected from hydrogen atom, oxygen atom, fluorine atom, alkyl group of 1-4 carbons, alkenyl group, alkynyl group, nitrile group, fluoroalkyl group, oxyalkyl group, aryl group, and R1，R2At least one aryl group.
3. The lithium ion battery electrolyte of claim 2, wherein the aryl sulfur ester compounds are selected from one or more of the compounds represented by the following structural formula:
Figure FDA0002328628930000012
4. the lithium-ion battery electrolyte of claim 1, wherein the boron-containing lithium salt is selected from the group consisting of LiBOB, liddob, LiBF4、LiBF2(CF3)2、LiBF2(C2F5)2One or more of (a).
5. The lithium-ion battery electrolyte of claim 4, wherein the lithium salt comprising boron is LiBOB, LiDFOB, LiBF4One kind of (1).
6. The lithium ion battery electrolyte of claim 1, wherein the negative film-forming additive is one or more of vinylene carbonate, fluoroethylene carbonate, vinyl sulfate, tris (trimethyl) silane borate, tris (trimethyl) silane phosphate, lithium bis (trifluoromethyl) sulfonyl imide, and lithium difluorophosphate.
7. The lithium ion battery electrolyte of claim 1, wherein the lithium salt is one or more of lithium hexafluorophosphate, lithium hexafluoroarsenate, lithium perchlorate, lithium tetrafluoroborate, lithium bis (oxalato) borate, lithium tris (oxalato) phosphate, lithium difluorooxalato borate, lithium bis (fluorosulfonyl) imide, lithium bis (trifluoromethanesulfonyl) imide, lithium difluorophosphate, lithium tetrafluorophosphate, and lithium difluorobis (oxalato) phosphate.
8. The lithium ion battery electrolyte of claim 1, wherein the lithium salt is present in the lithium ion battery electrolyte in an amount of 12.5 to 17% by weight.
9. The lithium ion battery electrolyte of claim 1, wherein the non-aqueous solvent is a mixture of ethylene carbonate, propylene carbonate, diethyl carbonate, and ethyl methyl carbonate.
10. A lithium ion battery comprising a positive electrode, a negative electrode, a separator and the lithium ion battery electrolyte according to any one of claims 1 to 9.
CN201911326984.1A 2019-12-20 2019-12-20 Lithium ion battery electrolyte and lithium ion battery containing same Pending CN111029655A (en)

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KR20030077858A (en) * 2002-03-27 2003-10-04 삼성에스디아이 주식회사 Electrolyte for a lithium secondary battery and lithium secondary battery comprising the same
CN105098238A (en) * 2014-05-20 2015-11-25 宁德时代新能源科技有限公司 Lithium ion secondary battery and electrolyte thereof
CN107017433A (en) * 2016-01-28 2017-08-04 宁德新能源科技有限公司 Nonaqueous electrolytic solution and lithium ion battery
CN109980282A (en) * 2019-04-09 2019-07-05 杉杉新材料（衢州）有限公司 A kind of low temperature resistant non-aqueous electrolyte for lithium ion cell and lithium ion battery

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CN113644311A (en) * 2020-04-27 2021-11-12 长沙宝锋能源科技有限公司 Low-temperature rechargeable ion battery and application
CN113948768A (en) * 2020-07-15 2022-01-18 浙江中蓝新能源材料有限公司 Silane additive, electrolyte containing same and lithium ion battery
CN114122492A (en) * 2020-08-31 2022-03-01 深圳新宙邦科技股份有限公司 Lithium ion battery
CN114784381A (en) * 2022-06-07 2022-07-22 湖北万润新能源科技股份有限公司 Electrolyte, preparation method thereof and lithium ion battery
CN115224346A (en) * 2022-07-20 2022-10-21 江苏正力新能电池技术有限公司 Lithium ion battery

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Application publication date: 20200417