CN108878977A - Inhibit the chemical conversion of lithium battery high temperature to produce gas and improves the electrolyte and preparation method of cryogenic property - Google Patents

Inhibit the chemical conversion of lithium battery high temperature to produce gas and improves the electrolyte and preparation method of cryogenic property Download PDF

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Publication number
CN108878977A
CN108878977A CN201810697543.1A CN201810697543A CN108878977A CN 108878977 A CN108878977 A CN 108878977A CN 201810697543 A CN201810697543 A CN 201810697543A CN 108878977 A CN108878977 A CN 108878977A
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electrolyte
additive
carbonate
cryogenic property
chemical conversion
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Inventor
杜付明
陈小平
齐士博
熊俊俏
李胜贤
王海军
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Thornton New Energy Technology (Changsha) Co.,Ltd.
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Soundon New Energy Technology 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or 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)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Secondary Cells (AREA)

Abstract

The present invention provides the electrolyte and preparation method of a kind of inhibition lithium battery high temperature chemical conversion production gas and improvement cryogenic property, wherein the electrolyte includes the component of following mass percent：Non-aqueous organic solvent 80.5-85.5%；Electrolyte lithium salt 12.5-15%；Cathode film formation additive 0.5-1.5%；Inhibit to produce gas additive 0.5-1%；Improve cryogenic property additive 0.5-1%；Eliminate H2The additive 0.5-1% of O and HF.The present invention also provides the preparation methods of above-mentioned electrolyte.Cathode film formation agent is added in the electrolytic solution, inhibits to produce gas additive, improve cryogenic property additive by the present invention, while introducing and eliminating H2The additive of O and HF can effectively inhibit chemical conversion to produce gas in this way, improve production efficiency, can also improve the cryogenic property of battery；And do not need substep and be melted into, it can also simplify chemical synthesis technology.

Description

Inhibit the chemical conversion of lithium battery high temperature to produce gas and improves the electrolyte and preparation method of cryogenic property
Technical field
The present invention relates to a kind of lithium ion battery electrolyte more particularly to a kind of inhibition lithium battery high temperature chemical conversion produce gas and The electrolyte and preparation method thereof for improving cryogenic property, belongs to battery technology field.
Technical background
Under the background of energy crisis and environmental problem, countries in the world all propose fuel-engined vehicle and are forbidden to use the time, Develop new-energy automobile, if electric car (EV) or hybrid vehicle (HEV) have been the task of top priority.It is well known that lithium is electric Consuming time is long when in the production process of pond using room temperature chemical conversion, and cathode interface is poor, therefore has developed high temperature chemical synthesis technology.But When moisture and air do not have strict control in electrolyte easy decomposition production gas, especially manufacturing process during high temperature chemical conversion, produce Tolerance greatly increases.In order to increase cryogenic property the additives such as sulfuric acid vinyl ester (DTD) can be added, further in some electrolyte It exacerbates high temperature chemical conversion and produces gas.So, it needs to increase airbag, increases cost, reduce production efficiency, soft pack cell inside is strong Big atmospheric pressure be easy to cause cell aluminum-plastic membrane to rupture, and when chemical conversion causes the danger of leakage explosion on fire.In addition, for lithium titanate electricity Pond to form SEI film due to being difficult to, and it is more serious that chemical conversion produces gas, it is therefore necessary to lithium ion battery formation process is improved, Improve battery safety and production efficiency.
Documents 1：CN106505250A discloses the method and use this method chemical conversion of a kind of inhibition Battery formation production gas Lithium ion battery, be by vacuumize process, be filled with protective gas and configuration include vinylene carbonate electrolyte inhibit Battery formation produces gas.The method of its substep specifically used chemical conversion, first precharge carries out part chemical conversion, and a part is melted into air pressure Rough vacuum vacuumize process is carried out, then recharges and continues to be melted into, carries out condition of high vacuum degree vacuumize process, so more Production efficiency is influenced, the production of enterprise is unfavorable for.
Documents 2：CN103872396A discloses a kind of electrolyte of inhibition lithium titanate battery production gas, is directed to lithium titanate The sylvite of specific dosage is added in battery producing gas in the electrolytic solution, by the electrochemically stable effect to lithium titanate anode, makes to be electrolysed Liquid keeps stablizing on lithium titanate anode surface, and lithium titanate battery is inhibited to produce gas, but the technical solution is not directed to graphite cathode, The anode of oxidation state can also be reacted with electrolyte when also not accounting for charging causes to produce gas, while also not accounting for micro in battery core Chemical conversion caused by H2O and HF produces gas.
Documents 3：CN105261791A discloses a kind of superelevation warm type high-voltage lithium-ion battery electrolyte and using should The lithium ion battery of electrolyte uses sultone compounds to inhibit to produce gas in high-temperature lithium ion battery storing process, but It is not produce gas for chemical conversion, does not also account for influence of the sultone compounds to cryogenic property.
The present invention is quasi- to propose a kind of electrolyte that can inhibit lithium battery high temperature chemical conversion production gas but also improve cryogenic property.
Summary of the invention
It is melted into the technical problem to be solved in the present invention is to provide a kind of inhibition lithium battery high temperature and produces gas and improvement cryogenic property Electrolyte and preparation method.
In order to solve the above-mentioned technical problem, the present invention uses following technical scheme：
A kind of electrolyte that the chemical conversion of lithium battery high temperature can be inhibited to produce gas and improvement cryogenic property, including following quality hundred are provided Divide the component of ratio：
Further,
The electrolyte lithium salt is lithium hexafluoro phosphate (LiPF6), lithium perchlorate (LiClO4), LiBF4 (LiBF4)、 Fluorohydrocarbon base Sulfonic Lithium (such as：LiCF3SO3, LiTFSI), dioxalic acid lithium borate LiBOB, in difluorine oxalic acid boracic acid lithium LiODFB It is one or more of.
Further,
The non-aqueous organic solvent includes cyclic carbonate and linear carbonate, cyclic carbonate：The matter of linear carbonate Amount is than being 25-35:75-65；Wherein：
Cyclic carbonate includes at least one of ethylene carbonate (abbreviation EC), propene carbonate (abbreviation PC)；
Linear carbonate includes diethyl carbonate (vehicle economy C), methyl ethyl carbonate (abbreviation EMC), dimethyl carbonate (abbreviation DMC at least two in).
Further,
The cathode film formation additive is vinylethylene carbonate (abbreviation VEC), in vinylene carbonate (abbreviation VC) It is at least one.
Further,
The inhibition produce gas additive be methane-disulfonic acid methylene ester (abbreviation MMDS), 1,3 propane sultones (referred to as 1, 3PS), acrylic sultones (abbreviation PES).
Further,
The improvement cryogenic property additive is ethyl sulfate (abbreviation DTD), sulfuric acid Asia propyl ester, ethylene sulfite (abbreviation ES), propylene sulfite (abbreviation PS).
Further,
It is described eliminate H2O and HF additive be organic dinitriles class such as：In succinonitrile (abbreviation SN), glutaronitrile (guide number) At least one.
The present invention also provides the preparations of the above-mentioned electrolyte that the chemical conversion of lithium battery high temperature can be inhibited to produce gas and improve cryogenic property Method specifically comprises the following steps：
1) component of following mass percent is weighed respectively first：
2) then electrolyte lithium salt is dissolved in non-aqueous organic solvent, stirring forms uniform solution A；
3) cathode film formation additive, inhibition then produced into gas additive, improve cryogenic property additive, elimination H2O and HF Additive be added in step 2) acquired solution A one by one to get.
Further,
In the above method, the electrolyte lithium salt is lithium hexafluoro phosphate (LiPF6), lithium perchlorate (LiClO4), tetrafluoro boric acid Lithium (LiBF4), fluorohydrocarbon base Sulfonic Lithium (such as：LiCF3SO3, LiTFSI), dioxalic acid lithium borate LiBOB, difluorine oxalic acid boracic acid lithium One or more of LiODFB.
Further,
In the above method, the non-aqueous organic solvent includes cyclic carbonate and linear carbonate, cyclic carbonate：It is linear The mass ratio of carbonic ester is 25-35:75-65；Wherein：
Cyclic carbonate includes at least one of ethylene carbonate (abbreviation EC), propene carbonate (abbreviation PC)；
Linear carbonate includes diethyl carbonate (vehicle economy C), methyl ethyl carbonate (abbreviation EMC), dimethyl carbonate (abbreviation DMC at least two in).
Further,
In the above method, the cathode film formation additive is vinylethylene carbonate (abbreviation VEC), vinylene carbonate At least one of (abbreviation VC).
Further,
In the above method, the inhibition produces gas additive for methane-disulfonic acid methylene ester (abbreviation MMDS), 1, in 3 propane sulfonic acid Ester (abbreviation 1,3PS), acrylic sultones (abbreviation PES).
Further,
In the above method, the improvement cryogenic property additive is ethyl sulfate (abbreviation DTD), sulfuric acid Asia propyl ester, Asia Sulfuric acid vinyl ester (abbreviation ES), propylene sulfite (abbreviation PS).
Further,
In the above method, it is described eliminate H2O and HF additive be organic dinitriles class such as：Succinonitrile (abbreviation SN), penta 2 At least one of nitrile (guide number).
Beneficial effects of the present invention：
1, existing invention uses substep chemical synthesis technology, on the one hand will increase chemical conversion time and difficulty, and do not account for aoxidizing The anode of state is reacted with electrolyte produces gas, also ignores H2Chemical conversion caused by O and HF produces gas, 1 be furthermore added, 3 propane sultones Cause the decline of cryogenic property, cathode film formation agent is added in the electrolytic solution, inhibits to produce gas additive, improve cryogenic property by the present invention Additive, while introducing and eliminating H2The additive of O and HF can effectively inhibit chemical conversion to produce gas in this way, improve production efficiency, also can Improve the cryogenic property of battery.
2, due to adding cathode film formation additive, positive protective agent, the additive for eliminating H2O and HF, lithium-ion electric simultaneously High temperature chemical conversion in pond produces gas and reduces, and does not need substep and is melted into, can also simplify chemical synthesis technology.
3, multiple additives act on the cryogenic property that can also improve lithium ion battery simultaneously.
Specific embodiment
In order to preferably illustrate the contents of the present invention, below by specific embodiment to further verifying of the invention.It is special Illustrate herein, embodiment is only that more directly description is of the invention, they are a part of the invention, cannot be to structure of the present invention At any restrictions.
Embodiment 1-3 of the invention below is while adding cathode film formation additive, inhibiting production gas additive, improvement low The electrolyte embodiment of the additive of warm performance additive and elimination H2O and HF
Embodiment 1
Gas is produced the present embodiment provides a kind of inhibition high-temperature lithium ion battery chemical conversion and improves the electrolyte of cryogenic property, the electricity It solves in liquid and produces gas additive MMDS containing cathode film formation additive VEC, inhibition, improvement cryogenic property additive DTD, eliminate H2O It is respectively 1%, 1%, 1%, 1% with the mass percent of the additive SN, VEC, MMDS, DTD, SN of HF in the electrolytic solution, it is non- The mass percent of aqueous organic solvent in the electrolytic solution is 83.5%, and the non-aqueous organic solvent is the mixed of EC, PC, DEC, EMC Close object, mass ratio 25:5:20:50, electrolyte is the LiPF of 1mol/L6, LiPF6Mass percent in the electrolytic solution is 12.5%.
Specific preparation method is as follows：
1) above-mentioned each raw material component is weighed respectively according to above-mentioned mass percent and mass ratio；
2) then the lithium salts LiPF6 as electrolyte is dissolved in the mixture of non-aqueous organic solvent EC, PC, DEC, EMC In, stirring forms uniform solution A；
3) cathode film formation additive VEC, inhibition then produced into gas additive MMDS, improvement cryogenic property additive DTD, disappeared Except the additive SN of H2O and HF is added in step 2) acquired solution A one by one to get being denoted as sample S1.
Embodiment 2
The present embodiment the difference from embodiment 1 is that：The cathode film formation additive added in the present embodiment electrolyte is VC, Inhibit to produce gas additive to be 1,3PS, improvement cryogenic property additive is ES, VC, 1, the quality hundred of 3PS, ES, SN in the electrolytic solution Divide than being respectively 0.5%, 0.5%, 0.5%, 0.5%；The mass percent of non-aqueous organic solvent in the electrolytic solution is 85.5%, Non-aqueous organic solvent in electrolyte is the mixture of EC, PC, DEC, DMC, EMC, mass ratio 20:5:25:5:45.
Electrolyte is the LiBF of 1mol/L4, LiBF4Mass percent in the electrolytic solution is 12.5%.
Preparation method is made electrolyte sample and is denoted as S2 referring to embodiment 1.
Embodiment 3
The present embodiment the difference from embodiment 1 is that：The cathode film formation additive added in the present embodiment electrolyte is VC With the mixture of VEC；Inhibit to produce gas additive to be PES；Improvement cryogenic property additive is sulfuric acid Asia propyl ester, eliminates H2O and HF Additive be GN；
VC, VEC, PES, sulfuric acid Asia propyl ester, the mass percent of GN in the electrolytic solution be respectively 0.8%, 0.2%, 0.8%, 0.8%, 0.8%；；
The mass percent of non-aqueous organic solvent in the electrolytic solution is 84.1%, non-aqueous organic solvent EC, EMC, DEC's Mixture, mass ratio 30:50:20.
Electrolyte is the LiTFSI of 1mol/L, and the mass percent of LiTFSI in the electrolytic solution is 12.5%.
Preparation method is made electrolyte sample and is denoted as S3 referring to embodiment 1.
Embodiment 4
The present embodiment the difference from example 2 is that：The mass percent difference of VC, 1,3PS, ES, SN in the electrolytic solution It is 1.5%, 1%, 1%, 1%；The mass percent of non-aqueous organic solvent in the electrolytic solution is 80.5%, non-aqueous in electrolyte Organic solvent is the mixture of EC, PC, DEC, DMC, EMC, mass ratio 30:5:25:5:35.
Electrolyte is the LiClO of 1.2mol/L4, LiClO4Mass percent in the electrolytic solution is 15%.
Preparation method is made electrolyte sample and is denoted as S4 referring to embodiment 1.
Embodiment 5
The present embodiment and the difference of embodiment 3 are：VC, VEC, PES, sulfuric acid Asia propyl ester, the quality of GN in the electrolytic solution Percentage is respectively 0.5%, 1%, 0.8%, 0.8%, 0.8%；；
The mass percent of non-aqueous organic solvent in the electrolytic solution is 82.5%, non-aqueous organic solvent EC, EMC, DEC's Mixture, mass ratio 25:50:25.
Electrolyte is the LiCF of 1.12mol/L3SO3, LiCF3SO3Mass percent in the electrolytic solution is 14%.
Preparation method is made electrolyte sample and is denoted as S5 referring to embodiment 1.
Comparative example 1 (only addition film for additive and inhibition high temperature chemical conversion produce gas additive)
Gas is produced the present embodiment provides a kind of inhibition high-temperature lithium ion battery chemical conversion and improves the electrolyte of cryogenic property, the electricity It solves in liquid and produces the mass percent of gas additive MMDS, VEC, MMDS in the electrolytic solution containing cathode film formation additive VEC, inhibition Respectively 1.5%, 1%, the mass percent of non-aqueous organic solvent in the electrolytic solution are 82.5%, and the non-aqueous organic solvent is The mixture of EC, PC, DEC, EMC, mass ratio 25:5:20:50, electrolyte is the LiPF of 1.2mol/L6, LiPF6It is being electrolysed Mass percent in liquid is 15%.
Preparation method is made electrolyte sample and is denoted as D1 referring to embodiment 1.
Comparative example 2 (only addition film for additive and improvement cryogenic property additive)
Gas is produced the present embodiment provides a kind of inhibition high-temperature lithium ion battery chemical conversion and improves the electrolyte of cryogenic property, the electricity It solves in liquid containing cathode film formation additive VC, the mass percent of improvement cryogenic property additive DTD, VC, DTD in the electrolytic solution Respectively 1.5%, 1%, the mass percent of non-aqueous organic solvent in the electrolytic solution are 82.5%, and the non-aqueous organic solvent is The mixture of EC, PC, DEC, EMC, mass ratio 25:5:20:50, electrolyte is the LiPF of 1.2mol/L6, LiPF6It is being electrolysed Mass percent in liquid is 15%.
Preparation method is made electrolyte sample and is denoted as D2 referring to embodiment 1.
Comparative example 3 (the only additive of addition film for additive and elimination water and HF)
Gas is produced the present embodiment provides a kind of inhibition high-temperature lithium ion battery chemical conversion and improves the electrolyte of cryogenic property, the electricity The additive SN in liquid containing cathode film formation additive VC and VEC, elimination water and HF is solved, the matter of VC, VEC, SN in the electrolytic solution Measuring percentage is 0.8%, 0.2%, 0.5%, and the mass percent of non-aqueous organic solvent in the electrolytic solution is 83.5%, described non- Aqueous organic solvent is the mixture of EC, PC, DEC, EMC, mass ratio 25:5:20:50, electrolyte is 1.2mol/L's LiPF6, LiPF6Mass percent in the electrolytic solution is 15%.
Preparation method is made electrolyte sample and is denoted as D3 referring to embodiment 1.
It is soft that the electrolyte obtained in above-described embodiment and comparative example numbered as S1-S5, D1-D3 is injected into NCM/ graphite In packet battery, soft-package battery DC1-DC8, rated capacity 25Ah is made in aluminum plastic film encapsulation, is melted into 60 DEG C of high temperature, after chemical conversion With drainage survey gas production, after chemical conversion battery core by two envelopes, partial volume and etc. after carry out -20 DEG C, 0.2C low temperature charging measurement is torn open Solution observation cathode analyses lithium degree, and chemical conversion produces depressed fruit and -20 DEG C, and 0.2C low temperature charging measurement performance is shown in Table 1.
The low temperature charging performance of the chemical conversion of 1 soft-package battery DC1-DC8 of table average gas production and -20 DEG C of 0.2C
It can be seen that according to the test result of upper table 1：Soft-package battery made from embodiment 1-5 electrolyte sample S1-S5 The high temperature chemical conversion gas production of DC1-DC5 considerably less than soft-package battery DC6-DC8 made from comparative example 1-3 electrolyte sample D1-D3, Low temperature charging cathode interface is better than comparative example.Especially therefore, it was demonstrated that the comprehensive performance of several additives of the present invention compares comparison Example only individually addition wherein certain performance it is significant, can solve that high temperature chemical conversion produces gas and low temperature charging cathode is easy analysis lithium simultaneously Problem.
The above is a specific embodiment of the invention, but any restrictions cannot be constituted to the present invention, therefore need special It points out, it is all based on the present invention, it is made any modification and is all fallen within the scope of the present invention with improvement.

Claims (10)

1. a kind of inhibit the chemical conversion of lithium battery high temperature to produce gas and improve the electrolyte of cryogenic property, which is characterized in that
The electrolyte includes the component of following mass percent：
2. according to claim 1 inhibit the chemical conversion of lithium battery high temperature to produce gas and improve the electrolyte of cryogenic property, feature It is,
The non-aqueous organic solvent includes cyclic carbonate and linear carbonate, cyclic carbonate：The mass ratio of linear carbonate For 25-35:75-65；Wherein：
Cyclic carbonate includes at least one of ethylene carbonate, propene carbonate；
Linear carbonate includes diethyl carbonate, methyl ethyl carbonate, at least two in dimethyl carbonate.
3. according to claim 1 inhibit the chemical conversion of lithium battery high temperature to produce gas and improve the electrolyte of cryogenic property, feature It is,
The electrolyte lithium salt be lithium hexafluoro phosphate, lithium perchlorate, LiBF4, fluorohydrocarbon base Sulfonic Lithium, dioxalic acid lithium borate, One or more of difluorine oxalic acid boracic acid lithium.
4. according to claim 1 inhibit the chemical conversion of lithium battery high temperature to produce gas and improve the electrolyte of cryogenic property, feature It is,
The cathode film formation additive is at least one of vinylethylene carbonate, vinylene carbonate.
5. according to claim 1 inhibit the chemical conversion of lithium battery high temperature to produce gas and improve the electrolyte of cryogenic property, feature It is,
It is described to inhibit to produce gas additive as one in methane-disulfonic acid methylene ester, 1,3 propane sultones, acrylic sultones Kind.
6. according to claim 1 inhibit the chemical conversion of lithium battery high temperature to produce gas and improve the electrolyte of cryogenic property, feature It is,
The improvement cryogenic property additive is ethyl sulfate, sulfuric acid Asia propyl ester, ethylene sulfite ES, sulfurous acid propylene Ester.
7. according to claim 1 inhibit the chemical conversion of lithium battery high temperature to produce gas and improve the electrolyte of cryogenic property, feature It is,
The elimination H2The additive of O and HF be organic dinitriles class such as：At least one of succinonitrile, glutaronitrile.
8. a kind of inhibit the chemical conversion of lithium battery high temperature to produce gas and improve the preparation method of the electrolyte of cryogenic property, which is characterized in that Specifically comprise the following steps：
1) component of following mass percent is weighed respectively first：
2) then electrolyte lithium salt is dissolved in non-aqueous organic solvent, stirring forms uniform solution A；
3) cathode film formation additive, inhibition then produced into gas additive, improve cryogenic property additive, elimination H2The addition of O and HF Agent be added in step 2) acquired solution A one by one to get.
9. a kind of system of electrolyte for inhibiting the chemical conversion of lithium battery high temperature to produce gas and improvement cryogenic property according to claim 8 Preparation Method, which is characterized in that
In the above method, the non-aqueous organic solvent includes cyclic carbonate and linear carbonate, cyclic carbonate：Linear carbonic acid The mass ratio of ester is 25-35:75-65；Wherein：
Cyclic carbonate includes at least one of ethylene carbonate, propene carbonate；
Linear carbonate includes diethyl carbonate, methyl ethyl carbonate, at least two in dimethyl carbonate.
10. a kind of electrolyte for inhibiting the chemical conversion of lithium battery high temperature to produce gas and improvement cryogenic property according to claim 8 Preparation method, which is characterized in that
In the above method, it is methane-disulfonic acid methylene ester, 1,3 propane sultones, acrylic sulfonic acid that the inhibition, which produces gas additive, One of lactone.
CN201810697543.1A 2018-06-29 2018-06-29 Inhibit the chemical conversion of lithium battery high temperature to produce gas and improves the electrolyte and preparation method of cryogenic property Withdrawn CN108878977A (en)

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