CN108183260A - A kind of electrolyte and lithium ion battery - Google Patents
A kind of electrolyte and lithium ion battery Download PDFInfo
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- CN108183260A CN108183260A CN201711328239.1A CN201711328239A CN108183260A CN 108183260 A CN108183260 A CN 108183260A CN 201711328239 A CN201711328239 A CN 201711328239A CN 108183260 A CN108183260 A CN 108183260A
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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
- 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
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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
- H01M10/0568—Liquid materials characterised by the solutes
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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
- H01M10/42—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
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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
- H01M2300/0025—Organic electrolyte
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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
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Abstract
The invention discloses the electrolyte and lithium ion battery of a kind of lithium ion battery, which includes organic solvent, lithium salts and additive, and the organic solvent includes one or more in carbonates, carboxylic acid esters, ethers, sulfur-bearing solvent and fluorinated solvents；The additive includes high voltage additive and auxiliary additive.The present invention reduces the generation of side reaction in battery, improves the oxidisability and stability of electrolyte, the electrochemical window of electrolyte is widened, so as to improve the high voltage performance of lithium ion battery by reducing the impurity content of lithium hexafluoro phosphate and additive.
Description
Technical field
The invention belongs to lithium ion battery manufacture technology field more particularly to a kind of improvement lithium ion battery high voltage performances
Method, more specifically, be related to a kind of electrolyte and lithium ion battery.
Background technology
Lithium ion battery is due to operating voltage height, and energy density is big, the advantages that having extended cycle life obtains in electric vehicle field
To being widely applied.With the fast development of China's new-energy automobile, people are to the energy density and course continuation mileage of power battery
Higher requirement is proposed, according to《2025 major fields technology way for development line chart of made in China》In corresponding planning, for lithium
Battery has done following prospect：It is more than 300Wh/kg, power lithium battery specific power to energy type lithium battery energy density in 2025
4000W/kg, power battery<1.5 yuan/Wh, energy-storage battery<1.0 yuan/Wh.And for new-energy automobile, it is desirable that power battery list
Physical efficiency metric density reaches 400Wh/kg, and cost is down to 0.8 yuan/Wh, 1 yuan/Wh of system cost.
In order to design the lithium ion battery of high-energy density, in addition to being continued to optimize to its space availability ratio, battery is improved
The compacted density and gram volume of positive and negative pole material are lived using High-conductivity carbon nanometer and polymeric adhesive to improve anode and cathode
Property content of material outside, the operating voltage that promotes lithium ion battery is also one of important channel for increasing battery energy density.At present
High-voltage positive electrode material of the operating voltage in 4.35V-5V, but existing carbonate group electrolyte in the market are had been obtained in the market
The high voltage operation requirement of lithium battery can not be met, violent oxygenolysis just takes place in 4.4V or so, to battery
Capacity, cycle life, security performance etc. have critically important influence.Therefore the exploitation of lithium battery high-voltage electrolyte is compeled in eyebrow
Eyelash.
In traditional carbonate group electrolyte, the purity of lithium salts and additive is relatively low, contains more moisture, acid and gold
Belong to the impurity such as ion, have a great impact to the stability and oxidative resistance of electrolyte.Impurity deposits in cell operations
It can make positive electrode surface that can not form effective passivation layer, lead to the stability of positive and negative anodes SEI films to reduce, interface impedance increases,
And then influence the high temperature and high voltage capability of battery.Therefore the purity of lithium salts and additive in electrolyte is improved, is to improve lithium electricity
A kind of effectively method of pond high voltage performance.
Invention content
An object of the present invention is to provide a kind of new lithium-ion electrolyte and corresponding lithium ion battery, passes through raising
The purity of lithium salts and additive in electrolyte reduces the content of the impurity such as moisture, acid, metal ion in electrolyte, effectively carries
The high stability and high voltage performance of electrolyte, has significantly widened the electrochemical window of electrolyte, while improve battery
The stability of median surface SEI films reduces interface impedance.And electrolyte prepared by the present invention has higher conductivity and safety
Can, it is greatly increased to electrical properties such as the high pressure resistant of battery, high temperature, cycles.
In order to achieve the above object, present invention firstly provides a kind of electrolyte, the electrolyte includes organic solvent, lithium
Salt and additive,
The organic solvent include carbonates, carboxylic acid esters, ethers, sulfur-bearing solvent and one kind in fluorinated solvents or
It is a variety of；
The additive includes high voltage additive and auxiliary additive.
In above-mentioned electrolyte, a kind of substance that the high voltage additive is known in the art, be otherwise known as high electricity
Electrolysis additive is pressed, can be used for solving the problems, such as the oxygenolysis of common lithium-ion pond electrolyte under high voltages.
As a kind of better choice of above-mentioned electrolyte, the auxiliary additive is best for SEI film film for additive,
Other common auxiliary additives can be used for the electrolyte of the present invention.
As a kind of better choice of above-mentioned electrolyte, the organic solvent includes cyclic carbonate vinyl acetate, cyclic carbonate
Acrylic ester, linear dimethyl carbonate, linear diethyl carbonate and linear methyl ethyl carbonate it is one or more.
As a kind of better choice of above-mentioned electrolyte, the organic solvent includes cyclic carbonate and linear carbonates,
And the organic solvent accounts for the 10%-90% of electrolyte gross mass.
As a kind of better choice of above-mentioned electrolyte, the lithium salts is lithium hexafluoro phosphate.
As a kind of better choice of above-mentioned electrolyte, a concentration of 0.75-1.5mol/L of lithium hexafluoro phosphate.
As a kind of better choice of above-mentioned electrolyte, the high voltage additive includes fluoro carbonic ester class, nitrile, pyrrole
Cough up class, borate ester, sulfone class and di-oxalate lithium borate, difluorine oxalic acid boracic acid lithium, bis- (fluorine sulphonyl) imine lithiums, difluorophosphate,
It is one or more in bis- (trimethyl fluoride sulfonyl) imine lithiums.The purity of the high voltage additive of the present invention is preferably equal to or greater than
99.9%.
As a kind of better choice of above-mentioned electrolyte, the high voltage additive includes fluorinated ethylene carbonate, double grass
It is one or more in sour lithium borate, difluorophosphate, difluorine oxalic acid boracic acid lithium, bis- (fluorine sulphonyl) imine lithiums.
As a kind of better choice of above-mentioned electrolyte, the auxiliary additive includes vinylene carbonate, ethylene carbonate
Ethyl, ethylene sulfite, propylene sulfite, 1.3 propane sultones, 1,4 butyl sultones, in 1,3- propene sulfonic acids
It is one or more in ester, three (trimethyl silicon substrate) borates.The purity of the auxiliary additive of the present invention is preferably equal to or greater than
99.9%.
As a kind of better choice of above-mentioned electrolyte, the gross mass of the auxiliary additive is less than 5%.
Invention further provides a kind of lithium ion battery, the lithium ion battery includes above-mentioned electrolyte.
As a kind of better choice of above-mentioned lithium ion battery, the lithium ion battery is Li-Co-Ni-Mn system lithium cells.
As a kind of better choice of above-mentioned lithium ion battery, the lithium ion battery is LiNi0.5Co0.2Mn0.3O2Type,
Operating voltage range is 4.3V-4.5V.
The high-purity lithium salts and additive of the present invention can improve the resistance to oxidation and high-voltage performance of lithium ion battery.The electricity
Solution liquid can use under high pressure, operating voltage range 4.3V-4.5V.Preferably, 25 DEG C of battery room temperature, 1C multiplying powers, 4.3V
Capacity retention ratio is more than 90% after being recycled under voltage 500 weeks.
Lithium hexafluoro phosphate (the LiPF of the present invention6) purity be more than 99.95%.
Fluorine atom in the fluorinated ethylene carbonate that the present invention selects has strong electronegativity and low pole, makes it have higher
Electrochemical stability.The lithium carbonates such as di-oxalate lithium borate, difluorophosphate, difluorine oxalic acid boracic acid lithium can be in anode
Material surface forms effective passivating film, stablizes cathode material structure, prevents nickel from dissolving out, improve the high-voltage performance of battery.It improves
The purity of additive, the high voltage performance of battery can further be improved by reducing impurity content.
The beneficial effects of the present invention are：
1. the present invention carries out the preparation of electrolyte using the lithium salts of high-purity, by reducing the impurity content in lithium salts, greatly
The big generation for reducing side reaction in battery is effectively improved the stability and high voltage performance of electrolyte, electric property
Compared to 99.9% there is unexpected promotion, significantly widened the electrochemical window of electrolyte.
2. the auxiliary additive of compounding high-purity and high voltage additive, auxiliary additive improve cathode on this basis
The stability of SEI films reduces the generation of cathode interface side reaction, reduces impedance.High voltage additive being capable of preferential base solvent
Show to form effective passivation layer in anode, stabilizing material prevents nickel from dissolving out, and can make LiNi0.5Co0.2Mn0.3O2/ graphite system
Capacity retention ratio is more than 90% after soft-package battery recycles 500 weeks under 4.3V voltages, largely improves the height electricity of battery
Press performance.
3. electrolyte prepared by the present invention has higher conductivity and security performance, to the multiplying power of battery, high temperature, cycle etc.
Electrical property is greatly increased.
Description of the drawings
Fig. 1 is the high-voltage electrolyte of the embodiment of the present invention 1 and the conventional electrolysis liquid LSV curve comparison figures of comparative example 1；
Fig. 2 is the high-voltage electrolyte of the embodiment of the present invention 2 and the conventional electrolysis liquid LSV curve comparison figures of comparative example 2；
Fig. 3 is the high-voltage electrolyte of the embodiment of the present invention 6 and the conventional electrolysis liquid LSV curve comparison figures of comparative example 6；
Fig. 4 is the high-voltage electrolyte of the embodiment of the present invention 1 and lithium battery room temperature 25 prepared by the conventional electrolysis liquid of comparative example 1
DEG C, 1C multiplying powers, cycle performance comparison diagram under 4.3V voltages；
Fig. 5 is the high-voltage electrolyte of the embodiment of the present invention 2 and lithium battery room temperature 25 prepared by the conventional electrolysis liquid of comparative example 2
DEG C, 1C multiplying powers, cycle performance comparison diagram under 4.4V voltages；
Fig. 6 is the high-voltage electrolyte of the embodiment of the present invention 6 and lithium battery room temperature 25 prepared by the conventional electrolysis liquid of comparative example 6
DEG C, 1C multiplying powers, cycle performance comparison diagram under 4.3V voltages.
Specific embodiment
The content of present invention is described in further details with reference to specific embodiment.
Embodiment 1
The preparation of positive plate
By positive electrode active materials nickle cobalt lithium manganate LiNi0.5Co0.2Mn0.3O2, conductive agent Super-P, KS-6, bonding agent gathers
Vinylidene (PVDF) is according to mass ratio 94：1.5：1.5：It is uniformly dispersed in 3 addition solvent N-methyl pyrilidones (NMP),
Anode sizing agent is made.Then anode sizing agent is coated on Al foils (thickness be 18 μm), be then coated, roll-in, cross cutting, pole
The operations such as piece baking, are made positive plate.
The preparation of negative plate：
Negative electrode active material graphite, conductive agent Super-P and bonding agent water-base cement are added according to mass ratio 94: 2: 4
It is uniformly mixed in aqueous solvent, negative electrode slurry is made after stirring evenly.Then negative electrode slurry is coated in Cu foils (thickness is 8 μm)
On, be then coated, roll-in, cross cutting and pole piece baking etc. operations, be made negative plate.
Diaphragm uses thickness as 16+4 μm of ceramic coating membrane.
The preparation of lithium battery：
Above-mentioned positive plate, negative plate and diaphragm are fabricated to 1265132 electricity that capacity is 10Ah by coating lamination process
Then battery core is fitted into plastic-aluminum shell and assembles, subsequently enters vacuum bakeout process by core.The battery core of qualified by baking is noted
Liquid, electrolyte base solvent content are electrolyte gross mass 88%, and DEC/EMC/EC mass ratioes are 1：1：1, lithium hexafluoro phosphate is dense
It spends for 1.2mol/L, lithium salts purity is 99.95%.Auxiliary additive be ethylene carbonate (1.5%), 1,3-propane sultone
(2%), purity 99.9%.To after fluid injection battery core carry out vacuum seal, standing, chemical conversion, aging, partial volume to get to lithium from
Sub- battery.
Embodiment 2
The fluorinated ethylene carbonate that quality accounting is 1.5% is added in 1 electrolyte of embodiment as different from Example 1
(FEC), purity 99.99%.
Other are same as Example 1, no longer burdensome here.
Embodiment 3
The di-oxalate lithium borate that quality accounting is 2% is added in 1 electrolyte of embodiment as different from Example 1
(LiBOB), purity 99.9%, a concentration of 1.0mol/L of lithium hexafluoro phosphate, lithium salts purity are 99.95%..
Other are same as Example 1, no longer burdensome here.
Embodiment 4
It is 2% difluorine oxalic acid boracic acid lithium to add in quality accounting in 1 electrolyte of embodiment as different from Example 1
(LiODFB), purity 99.9%, a concentration of 1.2mol/L of lithium hexafluoro phosphate, lithium salts purity are 99.95%..
Other are same as Example 1, no longer burdensome here.
Embodiment 5
It is 2% difluorophosphate (LiPO to add in quality accounting in noted electrolyte as different from Example 12F2), it is pure
Spend is 99.9%.
Other are same as Example 1, no longer burdensome here.
Embodiment 6
It is 2% difluorine oxalic acid boracic acid lithium to add in quality accounting in 1 electrolyte of embodiment as different from Example 1
(LiODFB) and 1.5% fluorinated ethylene carbonate (FEC), purity is respectively 99.9% and 99.99%.
Other are same as Example 1, no longer burdensome here.
Comparative example 1
The purity of lithium hexafluoro phosphate added in noted electrolyte as different from Example 1 is 99.9%.
Other are same as Example 1, no longer burdensome here.
Comparative example 2
The fluorinated ethylene carbonate that quality accounting is 1.5% is added in noted electrolyte as different from Example 2
(FEC), purity 99.9%.
Other are same as Example 2, no longer burdensome here.
Comparative example 3
The di-oxalate lithium borate (LiBOB) that quality accounting is 2% is added in noted electrolyte as different from Example 3,
Its purity is 99.25%.
Other are same as Example 2, no longer burdensome here.
Comparative example 4
It is 2% difluorine oxalic acid boracic acid lithium (LiODFB) to add in quality accounting in noted electrolyte as different from Example 4,
Its purity is 99.25%.
Other are same as Example 2, no longer burdensome here.
Comparative example 5
It is 2% difluorophosphate (LiPO to add in quality accounting in noted electrolyte as different from Example 52F2), it is pure
Spend is 99.25%.
Other are same as Example 2, no longer burdensome here.
Comparative example 6
It is 2% difluorine oxalic acid boracic acid lithium (LiODFB) to add in quality accounting in noted electrolyte as different from Example 6
With 1.5% fluorinated ethylene carbonate (FEC), purity is 99.25% and 99.9%.
Other are same as Example 6.Here it is no longer burdensome.
Using linear sweep voltammetry (LSV) to the conventional electricity of 1-6 of embodiment of the present invention high-voltage electrolytes and comparative example 1-6
It solves liquid and carries out electrochemical window test.Test condition is as follows：Working electrode：Glass-carbon electrode；Reference electrode：Lithium silk；To electrode：Lithium
Piece.Sweep speed：0.2mV/sec；25 DEG C of room temperature, obtains LSV curves.As shown in Figure 1, 2, 3.The height of other embodiments of the invention
Press electrolyte and conventional electrolysis liquid under the same conditions obtained by LSV curve comparison figures it is similar with Fig. 1,2,3, therefore not sieve one by one
Row.
From figure 1 it appears that lithium hexafluoro phosphate compares comparative example employed in high-voltage electrolyte in the embodiment of the present invention 1
In electrolyte in purity it is high, oxidation reaction just takes place in 4.8V or so in 1 high-voltage electrolyte of embodiment, and in comparative example
Electrolyte 4.5V or so have begun to aoxidize, this proves the optimization by lithium salts purity, substantially increases electrolyte
High voltage performance.
From figure 2 it can be seen that electrolyte in the embodiment of the present invention 2 because the fluorinated ethylene carbonate purity added compared with
Height, in addition to higher inoxidizability, 2 electrolyte of comparative example just has occurred and that oxidation in 4.75V or so, and contains height for similary performance
Reaction then just takes place in the electrolyte of purity additive after 5.0V.
From figure 3, it can be seen that the high-voltage electrolyte in the embodiment of the present invention 6 is compared to the conventional electrolysis in comparative example 6
Liquid shows excellent high voltage performance, high voltage additive fluorinated ethylene carbonate and difluoro employed in electrolyte
Lithium bis (oxalate) borate is higher purity.
The lithium electricity prepared to the conventional electrolysis liquid of embodiment 1-6 high-voltage electrolytes using the present invention and comparative example 1-6
Pond carries out high voltage cycle performance test, the cyclicity of 1,2,6 conventional electrolysis liquid of 1,2,6 high-voltage electrolyte of embodiment and comparative example
Can comparison diagram as shown in Figure 4,5, 6, it is similar with Fig. 4,5,6 that other embodiments of the invention survey cycle performance comparison diagram, therefore differs
One enumerates.
As can be seen that the embodiment of the present invention 1,2,6 is because of the electrolyte lithium salts using higher degree and addition from Fig. 4,5,6
Agent reduces the content of impurity, reduces the generation of side reaction during circulating battery, improves the interface stability of electrolyte
And high voltage performance, compared to comparative example 1,2,6, prepared battery core, cycle of higher pressure performance substantially improves.
In Fig. 4 25 DEG C of battery room temperature, 1C multiplying powers and 4.3V voltages are prepared for 1 electrolyte of embodiment and 1 electrolyte of comparative example
Lower cycle performance comparison diagram.It was the circulating battery prepared by 99.95% lithium hexafluorophosphate electrolyte solution to 500 weeks to use purity
When, capacity retention ratio uses purity as circulating battery prepared by 99.9% lithium hexafluorophosphate electrolyte solution more than 95%
At 400 weeks, capacity retention ratio has already decreased to less than 75%.
Fig. 5 solves liquid for embodiment 2 and 2 electrolyte of comparative example prepares 25 DEG C of battery room temperature, is followed under 1C multiplying powers and 4.4V voltages
Ring performance comparison figure.The purity of additive fluorinated ethylene carbonate employed in embodiment 2 is 99.99%, prepared by
When circulating battery was to 200 weeks, capacity retention ratio 88.6%, and additive fluorinated ethylene carbonate purity is in comparative example 2
99.9, prepared circulating battery to capacity retention ratio at 200 weeks is 81.5%.
Fig. 6 solves liquid for embodiment 6 and 6 electrolyte of comparative example prepares 25 DEG C of battery room temperature, is followed under 1C multiplying powers and 4.4V voltages
Ring performance comparison figure.The purity of additive fluorinated ethylene carbonate and difluorine oxalic acid boracic acid lithium (LiODFB) in embodiment 2 point
Not Wei 99.9% and 99.99%, prepared by circulating battery to 400 weeks when, capacity retention ratio 87.5%, and comparative example 2
The purity of middle additive fluorinated ethylene carbonate and difluorine oxalic acid boracic acid lithium (LiODFB) is respectively 99.25% and 99.9%,
Prepared circulating battery to capacity retention ratio at 400 weeks is 76.4%, and capacity reduces very fast.
It should be noted last that the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be understood by those of ordinary skill in the art that, to the technical side of the present invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Right in.
Claims (12)
1. a kind of electrolyte, it is characterised in that：The electrolyte includes organic solvent, lithium salts and additive,
The organic solvent includes carbonates, carboxylic acid esters, ethers, sulfur-bearing solvent and one kind or more in fluorinated solvents
Kind；
The additive includes high voltage additive and auxiliary additive.
2. electrolyte according to claim 1, it is characterised in that：The organic solvent includes cyclic carbonate vinyl acetate, ring
Shape propene carbonate, linear dimethyl carbonate, linear diethyl carbonate and linear methyl ethyl carbonate it is one or more.
3. electrolyte according to claim 1 or 2, it is characterised in that：The organic solvent includes cyclic carbonate and line
Property carbonic ester, and the organic solvent accounts for the 10%-90% of electrolyte gross mass.
4. electrolyte according to claim 1, it is characterised in that：The lithium salts is lithium hexafluoro phosphate.
5. electrolyte according to claim 4, it is characterised in that：A concentration of 0.75-1.5mol/L of lithium hexafluoro phosphate.
6. electrolyte according to claim 1, it is characterised in that：The high voltage additive include fluoro carbonic ester class,
Nitrile, pyroles, borate ester, sulfone class and di-oxalate lithium borate, difluorine oxalic acid boracic acid lithium, bis- (fluorine sulphonyl) imine lithiums, difluoro
It is one or more in lithium phosphate, bis- (trimethyl fluoride sulfonyl) imine lithiums.
7. the electrolyte according to claim 1 or 6, it is characterised in that：The high voltage additive includes fluoro carbonic acid second
It is one or more in enester, di-oxalate lithium borate, difluorophosphate, difluorine oxalic acid boracic acid lithium, bis- (fluorine sulphonyl) imine lithiums.
8. electrolyte according to claim 1, it is characterised in that：The auxiliary additive includes vinylene carbonate, carbon
Sour vinylethylene, ethylene sulfite, propylene sulfite, 1,3- propane sultones, 1,4- butyl sultones, 1,3- propylene
It is one or more in sultones, three (trimethyl silicon substrate) borates.
9. electrolyte according to claim 1, it is characterised in that：The gross mass of the auxiliary additive is less than 5%.
10. lithium ion battery, which is characterized in that the lithium ion battery includes any electrolyte of claim 1-9.
11. lithium ion battery according to claim 10, it is characterised in that：The lithium ion battery is Li-Co-Ni-Mn
System lithium cell.
12. the lithium ion battery according to claim 10 or 11, it is characterised in that：The lithium ion battery is Li
Ni0.5Co0.2Mn0.3O2Type, operating voltage range 4.3V-4.5V.
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| CN109216768A (en) * | 2018-10-08 | 2019-01-15 | 河南师范大学 | A kind of lithium ion battery high-voltage long circulating additive and non-aqueous electrolyte for lithium ion cell and application containing the additive |
| CN109888390A (en) * | 2019-03-08 | 2019-06-14 | 东莞市坤乾新能源科技有限公司 | A kind of electrolyte and lithium battery that the dedicated high magnification high temperature resistant of electronic cigarette is taken into account |
| CN110649319A (en) * | 2019-10-18 | 2020-01-03 | 中国科学院过程工程研究所 | High-temperature-resistant electrolyte matched with high-nickel cathode material lithium ion battery |
| CN110943253A (en) * | 2019-10-24 | 2020-03-31 | 松山湖材料实验室 | High-voltage lithium ion battery combined electrolyte additive, electrolyte and battery thereof |
| CN111384442A (en) * | 2018-12-29 | 2020-07-07 | 浙江省化工研究院有限公司 | Film forming additive for battery electrolyte anode, electrolyte using film forming additive and lithium ion battery |
| CN113130994A (en) * | 2019-12-30 | 2021-07-16 | 深圳市研一新材料有限责任公司 | Electrolyte and electrochemical device comprising same |
| CN113363586A (en) * | 2021-06-28 | 2021-09-07 | 国联汽车动力电池研究院有限责任公司 | Lithium battery electrolyte and application thereof in lithium battery |
| CN113451646A (en) * | 2020-03-25 | 2021-09-28 | 深圳格林德能源集团有限公司 | Ternary lithium manganese oxide doped secondary battery electrolyte |
| CN114006037A (en) * | 2020-07-28 | 2022-02-01 | 深圳格林德能源集团有限公司 | Electrolyte for reducing self-discharge of lithium ion battery |
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| CN109216768A (en) * | 2018-10-08 | 2019-01-15 | 河南师范大学 | A kind of lithium ion battery high-voltage long circulating additive and non-aqueous electrolyte for lithium ion cell and application containing the additive |
| CN111384442A (en) * | 2018-12-29 | 2020-07-07 | 浙江省化工研究院有限公司 | Film forming additive for battery electrolyte anode, electrolyte using film forming additive and lithium ion battery |
| CN111384442B (en) * | 2018-12-29 | 2023-09-12 | 浙江省化工研究院有限公司 | Positive electrode film forming additive for battery electrolyte, electrolyte using additive and lithium ion battery |
| CN109888390A (en) * | 2019-03-08 | 2019-06-14 | 东莞市坤乾新能源科技有限公司 | A kind of electrolyte and lithium battery that the dedicated high magnification high temperature resistant of electronic cigarette is taken into account |
| CN110649319A (en) * | 2019-10-18 | 2020-01-03 | 中国科学院过程工程研究所 | High-temperature-resistant electrolyte matched with high-nickel cathode material lithium ion battery |
| CN110943253A (en) * | 2019-10-24 | 2020-03-31 | 松山湖材料实验室 | High-voltage lithium ion battery combined electrolyte additive, electrolyte and battery thereof |
| CN113130994A (en) * | 2019-12-30 | 2021-07-16 | 深圳市研一新材料有限责任公司 | Electrolyte and electrochemical device comprising same |
| CN113451646A (en) * | 2020-03-25 | 2021-09-28 | 深圳格林德能源集团有限公司 | Ternary lithium manganese oxide doped secondary battery electrolyte |
| CN114006037A (en) * | 2020-07-28 | 2022-02-01 | 深圳格林德能源集团有限公司 | Electrolyte for reducing self-discharge of lithium ion battery |
| CN113363586A (en) * | 2021-06-28 | 2021-09-07 | 国联汽车动力电池研究院有限责任公司 | Lithium battery electrolyte and application thereof in lithium battery |
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