CN108767318A - A kind of lithium salt electrolyte containing additive - Google Patents
A kind of lithium salt electrolyte containing additive Download PDFInfo
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- CN108767318A CN108767318A CN201810507789.8A CN201810507789A CN108767318A CN 108767318 A CN108767318 A CN 108767318A CN 201810507789 A CN201810507789 A CN 201810507789A CN 108767318 A CN108767318 A CN 108767318A
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- H—ELECTRICITY
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- 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
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- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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Abstract
The present invention proposes a kind of lithium salt electrolyte containing additive, lithium salts including additive, solvent and a concentration of 2.15~4.0mol/L, the additive are selected from the one or more of fluorinated ethylene carbonate, the ethylene carbonate that perfluoro-methyl replaces, the ethylene carbonate of perfluoro butyl substitution, the ethylene carbonate of perfluoro hexyl substitution and the ethylene carbonate of perfluoro capryl substitution.The present invention also proposes the lithium ion battery containing the lithium salt electrolyte.Solvent type additive fluoro carbonic ester is added in high concentration lithium salt electrolyte by the present invention, and fluoro carbonic ester participates in the solvation structure of electrolyte so that the F atom in fluorinated solvents and Li+Between dipolar interaction enhancing, be conducive to fluoro carbonic ester by going fluorine reaction to generate LiF and makrolon.Organic-inorganic compoiste SEI films are together formed with the reduzate of lithium salts anion and solvent in high concentration lithium salt electrolyte, the rigidity and elasticity of SEI films can be effectively improved.
Description
Technical field
The invention belongs to field of energy source materials, and in particular to a kind of electrolyte for lithium ion battery.
Background technology
In recent years, the development of high specific energy lithium ion battery and lithium battery puts forward higher requirements electrolyte, in order to full
The demand of sufficient battery development, researchers start to explore Novel electrolytic liquid system, such as ionic liquid, polymer dielectric and inorganic
Solid electrolyte etc., and achieve certain achievement.But eigenvalue problem existing for these material systems makes its commercial applications
Still face certain difficulty.Researchers also begin to examine the conventional electrolysis liquid optimized closely again at this time so that high concentration lithium salts
Electrolyte causes extensive concern again.Patent CN107069093A proposes that a kind of high concentration esters for lithium-sulfur cell are electrolysed
Liquid, the molar concentration of lithium salts in the electrolytic solution are higher than 3.0mol/L.Patent CN103219542A proposes that a kind of high salt concentration is non-aqueous
Electrolyte and application thereof, a concentration of 2~10mol/L of lithium salts, is mainly used for iron sulfide lithium in high salt concentration nonaqueous electrolyte
Battery system.
In lithium ion battery critical material, silicon is concerned as a kind of negative material with very high theoretical capacity.Silicon
With superelevation theoretical specific capacity (4200mAh/g) and lower de- lithium current potential (<0.5V), and the voltage platform of silicon is slightly above stone
Ink, in charging, difficulty causes surface to analyse lithium, and security performance is more preferable.For silicium cathode battery, select applicable electrolyte that can influence electricity
Pond performance, generally requires electrolysis additive, and stable SEI films are formed under the action of additive, avoids silicium cathode with following
Ring number increase and it is damaged.
According to investigations, had 20 remainder Chinese invention patents in recent years and more documents try hard to exploitation and are suitable for silicon-based anode
Electrolyte.Its method used can substantially be divided into three types, respectively there is certain defect：(1) in conventional electrolysis liquid (six
Lithium fluophosphate (LiPF6) organic carbonate weak solution (~1.0M)) on the basis of add functional additive (such as Chinese invention
Patent CN201110078105, CN201310323136 application number 201310624603.4 and CN201310628294 etc.), addition
The characteristics of agent is that with strong points, dosage is small, but promotes limited extent；(2) gel electrolyte (such as Chinese invention patent is used
CN201410323914 and CN201610193164 etc.), it is suitable for flexible battery, adjustable volume changes the stress generated, but
It is higher to silicon materials morphological requirements, ionic conductivity is low；(3) directly (such as Chinese invention is special for use or addition ionic liquid at room temperature
Sharp CN201110197729), cycle performance is far above conventional electrolysis liquid, only because the viscosity of ionic liquid at room temperature is big, resistance
It is anti-higher to lead to that its initial capacity is relatively low, high rate performance is poor.
Invention content
In view of the deficiencies of the prior art, the object of the present invention is to provide a kind of lithium salt electrolytes containing additive, utilize
The synergistic effect of fluoro carbonic ester class additive and high concentration lithium salt electrolyte, into one on the basis of high concentration lithium salt electrolyte
Step improves the chemical property of silicon based electrode.The electrolyte system is equally applicable to the cathode such as graphite.
Second object of the present invention is to propose the lithium ion battery containing the lithium salt electrolyte.
Realize that above-mentioned purpose technical solution of the present invention is：
A kind of lithium salt electrolyte containing additive, including additive, solvent and a concentration of 2.15~4.0mol/L
Lithium salts, the additive are fluoro carbonic ester, and the fluoro carbonic ester is selected from fluorinated ethylene carbonate (FEC), perfluoro-methyl takes
The carbonic acid second that the ethylene carbonate (TFM-EC) in generation, the ethylene carbonate (PFB-EC) of perfluoro butyl substitution, perfluoro hexyl replace
It is one or more in enester (PFH-EC) and the ethylene carbonate (PFO-EC) of perfluoro capryl substitution；The solvent is carbonic acid second
Enester, propene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC) and methyl ethyl carbonate enester (EMC), carbonic acid
It is one or more in first propyl ester (MPC) and carbonic acid first isopropyl ester (MiPC).
Wherein, it is LiN (C that the lithium salts, which is selected from general formula,xF2x+1SO2)(CyF2y+1SO2) lithium salts in it is one or more,
Middle x and y is natural number；Or it is selected from LiCF3SO3、LiC4F9SO3、LiC(SO2CF3)3, LiDFOB) in it is one or more.
Preferably, the lithium salts is difluoro lithium sulfimide, bis trifluoromethyl sulfimide lithium, two (trifluoromethyl sulphurs
Acyl) lithium, one kind in bis- (pentafluoroethyl group sulphonyl) imine lithiums；A concentration of 2.8~4.0mol/L of lithium salts.
It is highly preferred that the lithium salts is difluoro lithium sulfimide (LiFSI), a concentration of 3.8~3.9mol/L of lithium salts.
Wherein, the mass fraction of the additive in the electrolytic solution is 1~20%.
It is further preferred that the additive is fluorinated ethylene carbonate, the mass fraction of additive in the electrolytic solution is
3%~5%.
The lithium salt electrolyte can be prepared by the following method：Lithium salts is slowly added in solvent, lithium salt
After reaching 2.15~4.0mol/L, stirring makes lithium salts dissolve；Then additive is added in gained electrolyte, is stood after stirring
20~30h.Whole preparation process controls ambient moisture content<1ppm.
A kind of lithium ion battery, containing the lithium salt electrolyte, the cathode of the lithium ion battery is graphite negative electrodes
Or silicon-based anode.
The silicon based electrode includes the electrode of silicon, silicon/carbon and other materials.
The beneficial effects of the present invention are：
Solvent type additive fluoro carbonic ester is added in high concentration lithium salt electrolyte by the present invention, and fluoro carbonic ester participates in
Into the solvation structure of electrolyte so that the F atom in fluorinated solvents and Li+Between dipolar interaction enhancing, to
Be conducive to fluoro carbonic ester by going fluorine reaction to generate LiF and makrolon.With lithium salts anion in high concentration lithium salt electrolyte
Organic-inorganic compoiste solid electrolyte interface film (SEI) is together formed with the reduzate of solvent, so as to effectively improve
The rigidity and elasticity of SEI films.The SEI films can preferably adapt to huge volume change during silicon materials storage lithium, effectively press down
Silicon particle processed is broken, additionally has good kinetic property, to make the coulombic efficiency and capacity retention ratio of silicon based electrode
It is improved.
Description of the drawings
Fig. 1 is cyclic voltammetry curve of the silicon electrode in 2.87M LiFSI-PC high concentration lithium salt electrolytes.
Fig. 2 is cyclic voltammetry curve of the silicon electrode in 2.87M LiFSI-PC+3%FEC high concentration lithium salt electrolytes.
Fig. 3 be silicon electrode in 2.87M LiFSI-PC high concentration lithium salt electrolytes, charge-discharge magnification be 0.1C when, specific volume
Measure the change curve with circulating cycle number with coulombic efficiency (CE is the english abbreviation of coulombic efficiency).
Fig. 4 be silicon electrode in 2.87M LiFSI-PC+3%FEC high concentration lithium salt electrolytes, charge-discharge magnification 0.1C
When, specific capacity and coulombic efficiency with circulating cycle number change curve.
Fig. 5 is the surface FE-SEM after silicon electrode recycles 100 weeks in 2.87M LiFSI-PC high concentration lithium salt electrolytes
Image.
Fig. 6 is the surface after silicon electrode recycles 100 weeks in 2.87M LiFSI-PC+3%FEC high concentration lithium salt electrolytes
FE-SEM images.
Fig. 7 is the section FE-SEM after silicon electrode recycles 100 weeks in 2.87M LiFSI-PC high concentration lithium salt electrolytes
Image；
Fig. 8 is the section after silicon electrode recycles 100 weeks in 2.87M LiFSI-PC+3%FEC high concentration lithium salt electrolytes
FE-SEM images.
Fig. 9 is silicon electrode and its recycles the ATR-FTIR collection of illustrative plates of 50 weeks rear surfaces in 2.87M LiFSI-PC electrolyte；
Figure 10 is silicon electrode and its recycles the ATR- of 50 weeks rear surfaces in 2.87M LiFSI-PC+3%FEC electrolyte
FTIR collection of illustrative plates；
Specific implementation mode
Illustrate the present invention below by most preferred embodiment.Those skilled in the art institute it should be understood that, embodiment is only used for
It illustrates rather than for limiting the scope of the invention.
In embodiment, unless otherwise instructed, means used are the means of this field routine.
Silicon particle of the silicon electrode used in embodiment for grain size at 0.02~0.2 μm.
Silicon/carbon electrode material is prepared with molten salt electrolysis method.
Cyclic voltammetric is tested
The electrolyte that lithium salt is 2.87mol/L is prepared, using silicon electrode as working electrode, carries out cyclic voltammetric experiment.
Fig. 1 is cyclic voltammetry curve of the silicon electrode in 2.87M LiFSI-PC high concentration lithium salt electrolytes, sweep speed：
0.1mV s-1, voltage range：0.01V-OCV(vs.Li/Li+)；Fig. 2 is that silicon electrode is highly concentrated in 2.87M LiFSI-PC+3%FEC
Spend the cyclic voltammetry curve in lithium salt electrolyte, sweep speed：0.1mV s-1, voltage range：0.01V-OCV(vs.Li/Li+)。
In LiFSI/PC electrolyte, there are the reduction of PC and FSI anion, respectively in 0.75 and 1.38V or so (as schemed
1).The structure of electrolyte can be changed by improving lithium salt, and free solvent molecule is reduced, and contact ion-pair and aggregation increase,
Corresponding PC Reductive stabilities improve, and the Reductive stability of FSI anion declines, above when concentration of electrolyte reaches 2.15M
Most of solvent PC and lithium salts anion both participate in Li+Solvation structure in, at this time can electrode surface generate with
Organic-inorganic compoiste SEI films based on inorganic constituents.The compound SEI films are due to being rich in inorganic constituents, with organic type SEI
Film is compared, and has higher stability.Additive FEC fluoro ethylene carbonates are added in high concentration lithium salts LiFSI/PC electrolyte
After ester (FEC), other than the reduction of PC and FSI anion, the decomposition reaction (such as Fig. 2) of FEC also has occurred in 1.1V or so.
Comparative example 1
A kind of lithium ion battery high concentration lithium salt electrolyte 2.87M LiFSI-PC, organic solvent PC, lithium salts use
LiFSI, preparation method are：Certain mass PC solvents are first weighed, then LiFSI is slowly added in PC solvents, when being added
Stirring, lithium salt control to 2.87M, sealing stirring are for 24 hours, spare after standing for 24 hours；
The above high concentration lithium salt electrolyte and silicon electrode are assembled into button half-cell, under 0.1C multiplying powers, using charge and discharge
Electric tester carries out charge-discharge test.Fig. 3 is silicon electrode in 2.87MLiFSI-PC high concentration lithium salt electrolytes, charge and discharge times
When rate is 0.1C, specific capacity and coulombic efficiency are with the change curve of circulating cycle number, and wherein horizontal axis is cycle-index, and the left longitudinal axis is to fill
Electric specific capacity (mAgg-1), the right longitudinal axis is coulombic efficiency (%).Fig. 5 is silicon electrode in 2.87MLiFSI-PC high concentrations lithium salts electricity
Surface FE-SEM images after being recycled 100 weeks in solution liquid；Fig. 7 is silicon electrode in 2.87M LiFSI-PC high concentration lithium salt electrolytes
Section FE-SEM image of the middle cycle after 100 weeks；Fig. 9 is that silicon electrode recycles 50 Zhou Houbiao in 2.87M LiFSI-PC electrolyte
The ATR-FTIR collection of illustrative plates in face.
Comparative example 2
A kind of lithium ion battery 1M LiPF6-EC/DEC/DMC(1:1:1, vol)+3%FEC, organic solvent EC, DEC
And DMC, lithium salts LiPF6, preparation method is：First EC, DEC and DMC are mixed in equal volume, then by LiPF6It is slowly added to mix
It in bonding solvent, stirs while adding, lithium salt control to 1M, sealing stirring for 24 hours, then weighs 3%FEC (mass percent)
It is added in above-mentioned electrolyte, sealing stirring is for 24 hours, spare after standing for 24 hours；
By the conventional electrolysis liquid above containing FEC additives with silicon-carbon electrode assembling at button half-cell, in 0.1C multiplying powers
Under, charge-discharge test is carried out using charge-discharge test instrument.
Embodiment 1
A kind of high concentration lithium salt electrolyte 2.87M LiFSI-PC+3%FEC containing FEC, using PC as solvent, LiFSI is
Electrolyte, FEC are additive, and preparation method is：The PC solvents for first weighing certain mass, are then slowly added to PC by LiFSI
It in solvent, stirs while adding, lithium salt control to 2.87M, sealing stirring for 24 hours, then weighs 3%FEC (quality percentages
Number) it is added in above-mentioned electrolyte, sealing stirring is for 24 hours, spare after standing for 24 hours；Whole preparation process controls ambient moisture content<
1ppm。
High concentration lithium salt electrolyte above containing FEC additives is assembled into button half-cell with silicon electrode cathode,
Under 0.1C multiplying powers, charge-discharge test is carried out using charge-discharge test instrument.Fig. 4 is silicon electrode in 2.87M LiFSI-PC+3%FEC
In high concentration lithium salt electrolyte, when charge-discharge magnification is 0.1C, specific capacity and coulombic efficiency with circulating cycle number change curve,
Middle horizontal axis is cycle-index, and the left longitudinal axis is charge specific capacity (mAgg-1), the right longitudinal axis is coulombic efficiency (%).Fig. 6 is silicon electrode
Surface FE-SEM images after being recycled 100 weeks in 2.87M LiFSI-PC+3%FEC high concentration lithium salt electrolytes.Fig. 8 is silicon
Electrode recycled in 2.87MLiFSI-PC+3%FEC high concentration lithium salt electrolytes 100 weeks after section FE-SEM images.Figure 10
The ATR-FTIR collection of illustrative plates of 50 weeks rear surfaces is recycled in 2.87M LiFSI-PC+3%FEC electrolyte for silicon electrode.
Fluoro carbonic ester class additive is in conventional low concentration electrolyte, and there are many kinds of possible reduction modes, it is possible to
It is open loop, it is also possible to be fluorine, it is also possible to be various ways mixing, the present invention utilizes fluoro carbonic ester class additive and height
The synergistic effect of concentration lithium salt electrolyte, control fluoro carbonic ester class additive are generated favorably by way of polymerizeing after first removing fluorine
In the LiF and makrolon that improve SEI membrane stabilities, the infared spectrum of Figure 10 confirms this reduction result.
Embodiment 2
A kind of high concentration lithium salt electrolyte 2.87M LiFSI-PC+3%FEC containing FEC, using PC as solvent, LiFSI is
Electrolyte, FEC are additive, and preparation method is：The PC solvents for first weighing certain mass, are then slowly added to PC by LiFSI
It in solvent, stirs while adding, lithium salt control to 2.87M, sealing stirring is abundant for 24 hours, then weighs 3%FEC (quality hundred
Score) it is added in above-mentioned electrolyte, sealing stirring is for 24 hours, spare after standing for 24 hours；Whole preparation process control ambient moisture contains
Amount<1ppm.
High concentration lithium salt electrolyte above containing FEC additives is assembled into button half-cell with silicon/carbon electrode cathode,
Under 0.1C multiplying powers, charge-discharge test is carried out using charge-discharge test instrument.
Embodiment 3
A kind of high concentration lithium salt electrolyte 3.86M LiFSI-PC+3%FEC containing FEC, using PC as solvent, LiFSI is
Electrolyte, FEC are additive, and preparation method is：The PC solvents for first weighing certain mass, are then slowly added to PC by LiFSI
It in solvent, stirs while adding, lithium salt control to 3.86M, sealing stirring for 24 hours, then weighs 3%FEC (quality percentages
Number) it is added in above-mentioned electrolyte, sealing stirring is for 24 hours, spare after standing for 24 hours；Whole preparation process controls ambient moisture content<
1ppm。
High concentration lithium salt electrolyte above containing FEC additives is assembled into button half-cell with silicon electrode cathode,
Under 0.1C multiplying powers, charge-discharge test is carried out using charge-discharge test instrument.
Embodiment 4
A kind of high concentration lithium salt electrolyte 3.86M LiFSI-PC+5%FEC containing FEC, using PC as solvent, LiFSI is
Electrolyte, FEC are additive, and preparation method is：The PC solvents for first weighing certain mass, are then slowly added to PC by LiFSI
It in solvent, stirs while adding, lithium salt control to 3.86M, sealing stirring for 24 hours, then weighs 5%FEC (quality percentages
Number) it is added in above-mentioned electrolyte, sealing stirring is for 24 hours, spare after standing for 24 hours；Whole preparation process controls ambient moisture content<
1ppm。
High concentration lithium salt electrolyte above containing FEC additives is assembled into button half-cell with silicon electrode cathode,
Under 0.1C multiplying powers, charge-discharge test is carried out using charge-discharge test instrument.
Contrast effect about comparative example 1 and embodiment 1 is summarized as follows：
1) silicon electrode is recycled in basic high concentration lithium salt electrolyte with the high concentration lithium salt electrolyte containing FEC additives
Capacity after 100 weeks is respectively 1425.1mAgg-1And 2378.3mAgg-1, conservation rate raising about 30%；
2) in basic high concentration lithium salt electrolyte, the coulombic efficiency of silicon electrode in the change curve of circulating cycle number in 18-
There is hump between 28 weeks, this is because broken (such as Fig. 7) of silicon particle, SEI films, which regenerate, causes coulombic efficiency at this
Stage declines；And in the high concentration lithium salt electrolyte containing FEC, silicon particle is broken to be inhibited (such as Fig. 8), to keep away
The appearance of coulombic efficiency hump phenomenon is exempted from, coulombic efficiency is improved with the stability of circulating cycle number.
3) silicon electrode 2- in basic high concentration lithium salt electrolyte and the high concentration lithium salt electrolyte containing FEC additives
100 weeks average coulombic efficiencies are respectively 97.77% and 99.17%, and average coulombic efficiency improves 1.4%.
4) FEC cooperateed with FSI anion derived from SEI films there is good kinetic property, impedance to reduce, impedance is with following
Ring week, the stability of number improved, and lithium ion diffusion coefficient is by 2.39 × 10-12(the embedding lithium reactions of about 0.2V) and 1.39 × 10-12(about
0.5V lithiums react) it is respectively increased to 3.26 × 10-12With 1.78 × 10-12。
Comparing result about comparative example 2 and embodiment 2, embodiment 3 and embodiment 4 is listed in the table below：
Table 1：Cycle performance compares
Solvent type additive FEC is added in high concentration lithium salt electrolyte, is participated in solvation structure, due to fluoro
Solvent and Li+Coordination the C-F key polarity in FEC is increased, to be conducive to FEC by go fluorine reaction generate LiF
With polymerized thylene carbonate vinyl acetate poly (VC) (Figure 10).Poly (VC) has high resiliency, can be in high concentration lithium salt electrolyte
On the basis of the compound SEI films rich in inorganic constituents constructed in LiFSI/PC, the elasticity of SEI films is increased, and LiF
Generate the stability for further improving SEI films.The reduzate of FEC structure together with the reduzate of lithium salts anion and solvent
At the SEI films for having both rigidity and elasticity.Huge volume becomes during the SEI films can preferably adapt to silicon materials storage lithium
Change, effectively silicon particle is inhibited to be crushed (Fig. 6), additionally there is good kinetic property, to make the coulombic efficiency of silicon electrode
It is improved (Fig. 4) with capacity retention ratio.
Above embodiment be only the preferred embodiment of the present invention is described, not to the scope of the present invention into
Row limits, under the premise of not departing from design spirit of the present invention, technical side of this field ordinary engineering and technical personnel to the present invention
The all variations and modifications that case is made should all be fallen into the protection domain of claims of the present invention determination.
Claims (7)
1. a kind of lithium salt electrolyte containing additive, which is characterized in that including additive, solvent and a concentration of 2.15~
The lithium salts of 4.0mol/L, the additive are fluoro carbonic ester, and the fluoro carbonic ester is selected from fluorinated ethylene carbonate, perfluor first
The ethylene carbonate of base substitution, the ethylene carbonate of perfluoro butyl substitution, the ethylene carbonate of perfluoro hexyl substitution and perfluor are pungent
It is one or more in the ethylene carbonate of base substitution；The solvent be ethylene carbonate, propene carbonate, dimethyl carbonate,
It is one or more in diethyl carbonate, methyl ethyl carbonate enester, methyl propyl carbonate and carbonic acid first isopropyl ester.
2. lithium salt electrolyte according to claim 1, which is characterized in that it is LiN (C that the lithium salts, which is selected from general formula,xF2x+ 1SO2)(CyF2y+1SO2) lithium salts in it is one or more, wherein x and y are natural numbers；Or it is selected from LiCF3SO3、LiC4F9SO3、
LiC(SO2CF3)3, it is one or more in LiDFOB.
3. lithium salt electrolyte according to claim 2, which is characterized in that the lithium salts is difluoro lithium sulfimide, double
One kind in lithium trifluoromethanesulp,onylimide, two (trimethyl fluoride sulfonyl) lithiums, bis- (pentafluoroethyl group sulphonyl) imine lithiums；Lithium salts it is dense
Degree is 2.8~4.0mol/L.
4. lithium salt electrolyte according to claim 3, which is characterized in that the lithium salts is difluoro lithium sulfimide, lithium
A concentration of 3.8~3.9mol/L of salt.
5. lithium salt electrolyte according to claim 1, which is characterized in that the mass fraction of the additive in the electrolytic solution
It is 1~20%.
6. lithium salt electrolyte according to claim 5, which is characterized in that the additive is fluorinated ethylene carbonate, is added
It is 3%~5% to add the mass fraction of agent in the electrolytic solution.
7. a kind of lithium ion battery, which is characterized in that contain claim 1~6 any one of them lithium salt electrolyte, the lithium
The cathode of ion battery is graphite negative electrodes or silicon-based anode.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110148783A (en) * | 2019-04-01 | 2019-08-20 | 上海应用技术大学 | A kind of electrolyte and its preparation method and application improving graphite electrode surface SEI film properties |
| CN111063933A (en) * | 2019-12-11 | 2020-04-24 | 中国科学院山西煤炭化学研究所 | Lithium ion battery electrolyte suitable for high-voltage system |
| CN111463477A (en) * | 2020-03-13 | 2020-07-28 | 深圳大学 | Composite solid electrolyte with enhanced stability of fluorinated additive and preparation method thereof |
| CN112670584A (en) * | 2020-12-24 | 2021-04-16 | 湖南艾华集团股份有限公司 | Electrolyte with good safety performance, lithium ion battery and preparation method |
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