CN108288728A - It is a kind of adaptation silicon carbon material lithium-ion battery electrolytes and its application - Google Patents
It is a kind of adaptation silicon carbon material lithium-ion battery electrolytes and its application Download PDFInfo
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- CN108288728A CN108288728A CN201810065192.2A CN201810065192A CN108288728A CN 108288728 A CN108288728 A CN 108288728A CN 201810065192 A CN201810065192 A CN 201810065192A CN 108288728 A CN108288728 A CN 108288728A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of lithium-ion battery electrolytes of adaptation silicon carbon material and its applications.The lithium-ion battery electrolytes of this adaptation silicon carbon material, including electrolyte lithium salt, organic solvent and functional additive, the structural formula of functional additive be
Description
Technical field
The invention belongs to field of lithium ion battery, and in particular to it is a kind of adaptation silicon carbon material lithium-ion battery electrolytes and
It is applied.
Background technology
From portable electronic device, new-energy automobile, large-scale energy storage device, lithium ion battery has been widely used for people
The every aspect of life.The widely used transition metal oxidate for lithium of lithium ion battery is as anode, and graphite is as negative material.So
And existing system lithium ion battery energy density is increasingly difficult to meet the use demand of people, smart mobile phone fills for one day one,
Electric vehicle mileage anxiety etc. contradiction very severe, energy density restrict the development of lithium battery.In order to better meet people
Use demand, using more height ratio capacity raw material be undoubtedly most direct effective solution method.Silicon carbon material exactly exists
It is developed on the basis of this, the advantages of using silicon height ratio capacity, in conjunction with the long circulating stability of graphite, silicon-carbon cathode material obtained
Material has both the two advantage, is the cathode best candidate material of next-generation lithium ion battery with high energy density.
However, the silicon carbon material of high power capacity is in actual application, with the insertion of lithium ion, the larger volume of silicon is swollen
It bursts and is broken electrode/electrolyte interface stability, battery cycle life is poor.In order to improve the cyclical stability of silicon carbon material,
Numerous researchers develop material cladding in succession, and structure design and electrolysis additive etc. solution are various in type
Solution in, electrolysis additive is one of most directly efficient solution.In the electrolytic solution additive suitably at
Film additive can be effectively protected material, inhibit the decomposition of electrolyte to extend the cycle life of battery.
Invention content
It is an object of the invention to overcome silicon-carbon cathode material electrode/electrolyte interfacial property during cycle unstable
Fixed, the poor problem of cycle performance passes through to provide lithium-ion battery electrolytes and its application of a kind of adaptation silicon carbon material
Improve silicon carbon material with electrolyte interface property and then improves the cycle performance of battery.
The technical solution used in the present invention is：
A kind of lithium-ion battery electrolytes of adaptation silicon carbon material, including electrolyte lithium salt, organic solvent and function addition
Agent, shown in the functional additive structural formula such as formula (1)：
In electrolyte, a concentration of 0.8mol/L~1.2mol/L of electrolyte lithium salt, the mass percent of functional additive
It is 0.1%~5%.
Electrolyte lithium salt be lithium hexafluoro phosphate, LiBF4, lithium perchlorate, hexafluoroarsenate lithium, fluoro-alkyl lithium phosphate,
At least one of fluoroalkyl sulfonic acid lithium, lithium salts of sulfonimide, lithium-borate complexes, phosphoric acid lithium-complex.
In electrolyte, organic solvent is cyclic carbonate solvents and linear carbonate solvent with mass ratio 1：(3~0.5) group
At mixed solvent.
In organic solvent, cyclic carbonate solvents are ethylene carbonate；Linear carbonate solvent is dimethyl carbonate, carbonic acid
Diethylester, methyl ethyl carbonate, methyl propyl carbonate, gamma-butyrolacton, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, third
At least one of acetoacetic ester, butyl propionate.
Further include the auxiliary additive for accounting for electrolyte quality percentage 0~10% in electrolyte.
Auxiliary additive is vinylene carbonate, 1,3- propane sultones, fluorinated ethylene carbonate, fluoro propylene carbonate
Ester, vinylethylene carbonate, 1,4- butyl sultones, three (trimethyl) silane borates, sulfuric acid vinyl ester, propane sulfonic acid Asia ethylene
At least one of ester, sulfuric acid acrylic ester, propylene sulfite.
The preparation method of the lithium-ion battery electrolytes of this adaptation silicon carbon material, includes the following steps：
1) cyclic carbonate solvents and linear carbonate solvent are mixed, purifying obtains organic solvent；
2) at ambient temperature, electrolyte lithium salt, functional additive, auxiliary additive and step 1) are obtained organic molten
Agent is mixed, and obtains the lithium-ion battery electrolytes of above-mentioned adaptation silicon carbon material.
In the step 1) of preparation method of electrolyte, the specific method of purifying is to handle mixed solvent by molecular sieve.
A kind of silicon-carbon cathode lithium ion battery, electrolyte are that the lithium ion battery of above-mentioned adaptation silicon carbon material is electrolysed
Liquid.
The beneficial effects of the invention are as follows：
The present invention uses the electrolysis additive as adaptation silicon carbon material containing thiophene and the difunctional functional group's composition of boric acid,
Since the additive has higher reduction potential, it can restore, improve prior to solvent composition during first charge-discharge
The interface of silicon carbon material and electrolyte forms, and to stabilized electrodes/electrolyte interface, inhibits electrode surface reactivity, simultaneously
Avoid electrode in charge and discharge process with electrolyte contacts, it is suppressed that electrolyte component decompose.Silicon-carbon containing the additive is negative
Pole lithium ion battery has better cycle performance.
Specifically：
The present invention uses the electrolysis additive as adaptation silicon carbon material containing thiophene and the difunctional functional group's composition of boric acid,
Functional group containing thiophene or boracic element additive all can be effectively improved the cycle of high-voltage lithium ion battery by wide coverage
Performance.But the high rate performance that thiophene additive is generally not favored battery is added, and it is usual by the boron-containing additive of wide coverage
It is boron esters, is unfavorable for the storage performance of battery.The present invention makes full use of boron element electron deficient, stronger oxidation on this basis
The features such as activity are chosen unheeded boric acid structure and are organically combined with thiophene functional group, improve thiophene-based additive and are formed
The problem of interfacial film poorly conductive, the advantages of both giving full play to.
Specific implementation mode
A kind of lithium-ion battery electrolytes of adaptation silicon carbon material, including electrolyte lithium salt, organic solvent and function addition
Agent, the functional additive is 5- methylthiophene -2- boric acid, shown in structural formula such as formula (1)：
Preferably, in electrolyte, a concentration of 0.8mol/L~1.2mol/L of electrolyte lithium salt；The electrolyte lithium salt
The ultimate density of a concentration of lithium salts in the electrolytic solution.
Preferably, in electrolyte, the mass percent of functional additive is 0.1%~5%；It is further preferred that electrolysis
In liquid, the mass percent of functional additive is 0.5%~3%.
Preferably, electrolyte lithium salt is lithium hexafluoro phosphate (LiPF6), LiBF4 (LiBF4), lithium perchlorate
(LiClO4), hexafluoroarsenate lithium (LiAsF6), fluoroalkane lithium phosphate, fluoroalkyl sulfonic acid lithium, lithium salts of sulfonimide, lithium borate
At least one of complex, phosphoric acid lithium-complex；It is further preferred that electrolyte lithium salt is lithium hexafluoro phosphate, tetrafluoro boric acid
Lithium, lithium perchlorate, hexafluoroarsenate lithium, LiPF6-n(CF3)n(0<n<6, n round numbers), three catechol phosphoric acid ester lithium salts, two grass
Sour lithium borate (LiBOB), difluorine oxalic acid boracic acid lithium (LiDFOB), LiN [(FSO2C6F4)(CF3SO2)], trifluoromethyl sulfonic acid lithium
(LiSO3CF3), bis trifluoromethyl sulfimide lithium (LiTFSi), LiCH (SO2CF3)2At least one of (LiTFSM).
Preferably, in electrolyte, organic solvent is cyclic carbonate solvents and linear carbonate solvent with mass ratio 1：(3
~0.5) mixed solvent formed；It is further preferred that in organic solvent, cyclic carbonate solvents and linear carbonate solvent
Mass ratio 1:3~3:2.
Preferably, in organic solvent, cyclic carbonate solvents are ethylene carbonate (EC)；Linear carbonate solvent is carbonic acid
Dimethyl ester (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), methyl propyl carbonate, gamma-butyrolacton, methyl acetate, second
At least one of acetoacetic ester, propyl acetate, methyl propionate, ethyl propionate, butyl propionate.
Preferably, further include the auxiliary additive for accounting for electrolyte quality percentage 0~10% in electrolyte.
Preferably, auxiliary additive is vinylene carbonate (VC), 1,3-propane sultone (PS), fluorinated ethylene carbonate
(FEC), fluoropropylene carbonate (FPC), vinylethylene carbonate (VEC), 1,4- butyl sultones (BS), three (trimethyl) silicon
At least one of alkane borate, sulfuric acid vinyl ester (DTD), propane sulfonic acid vinylene, sulfuric acid acrylic ester, propylene sulfite.
The preparation method of the lithium-ion battery electrolytes of this adaptation silicon carbon material, includes the following steps：
1) cyclic carbonate solvents and linear carbonate solvent are mixed, purifying obtains organic solvent；
2) at ambient temperature, electrolyte lithium salt, functional additive, auxiliary additive and step 1) are obtained organic molten
Agent is mixed, and obtains the lithium-ion battery electrolytes of above-mentioned adaptation silicon carbon material.
Preferably, in the step 1) of preparation method of electrolyte, the specific method of purifying is that mixed solvent is passed through molecular sieve
Processing；It is further preferred that the model of molecular sieveType,Type orType；Still further preferably, the model of molecular sieve
ForType orType.
Preferably, in the step 2) of preparation method of electrolyte, it is 25 DEG C~40 DEG C that room temperature, which refers to temperature,.
A kind of silicon-carbon cathode lithium ion battery, electrolyte are that the lithium ion battery of above-mentioned adaptation silicon carbon material is electrolysed
Liquid.
Further, a kind of silicon-carbon cathode lithium ion battery, including shell, battery core, diaphragm and above-mentioned adaptation silicon-carbon material
The lithium-ion battery electrolytes of material.
Battery core includes anode and cathode, and material is the ordinary skill in the art.Citing, positive electrode can be cobalt acid
At least one of lithium, nickel ion doped, LiMn2O4, nickel-cobalt-manganese ternary material；Negative material is silicon carbon material.
Further, anode include removal lithium embedded active material, conductive agent, collector and by this by active material with collection
The binder that fluid combines.
In anode, removal lithium embedded active material be in lithium and Mg, Al, B, Ti, Sn, Ge, Fe, Sr, Ga, rare earth element at least
A kind of metal oxide of composition.
Further, removal lithium embedded active material further includes polyanionic polymer LiMx(PO4)y, wherein M be Ni, Co, Mn,
One kind in Ti, V, Fe.
Further, cathode include can the active material of reversible removal lithium embedded, conductive agent, collector and will be active by this
The binder that substance is combined with collector.
In cathode, the active material of the reversible removal lithium embedded of energy is silicon-carbon.
Further, carbon material is natural graphite, electrographite, graphitization MCMB, intermediate phase pitch-based carbon fiber in silicon-carbon
At least one of dimension.
Further, silicon content is 0.5wt%~10wt% in silicon carbon material.
Silicon-carbon cathode lithium ion battery of the present invention does not have particular/special requirement to battery variety, can be the routine in field
Selection, including various half-cells, full battery.
The preparation method of silicon-carbon cathode lithium ion battery of the present invention does not have particular/special requirement with assembling form, can be lithium
Any conventional selection in ion battery field, such as soft-package battery, button cell, rectangular cell, cylindrical battery.
Present disclosure is described in further detail below by way of specific embodiment.It is former used in embodiment
Material unless otherwise specified, can be obtained from routine business approach.
Embodiment 1：
For embodiment 1 by taking button silicon-carbon battery as an example, specific preparation method is as follows：
(1) by cyclic carbonate solvents ethylene carbonate (EC) and linear carbonate solvent methyl ethyl carbonate (EMC) and
Dimethyl carbonate (DMC) in mass ratio EC: EMC: DMC=3: 5: 2 mixes, and usesType molecular sieve, calcium hydride, lithium hydride
Clarification, water removal, obtain non-aqueous organic solvent；
(2) at ambient temperature, electrolyte lithium salt bis-trifluoromethylsulfoandimide lithium (LiTFSi) is added obtained by step (1)
To solvent in, final concentration of 1.0mol/L is stirred evenly, and obtains general electrolytic liquid；
(3) functional additive 5- methylthiophene -2- boric acid is added in the general electrolytic liquid that step (2) obtains, it is described
The mass percent of functional additive in the electrolytic solution is 1%, the lithium ion electrolysis of adaptation high-energy density silicon-carbon cathode material
Liquid.
The production method of lithium battery is exemplified below：
The material that cathode is selected is silicon-carbon, by silicon-carbon, conductive agent acetylene black, binder PVDF according to mass ratio 8:1:1
After ratio mixing, N-Methyl pyrrolidone solvent is added, oil slurry is made, finally slurry is coated on copper foil, drying is made
Cathode pole piece.
Electrolyte uses the lithium-ion electrolyte of above-mentioned adaptation high-energy density silicon-carbon cathode material.
Negative cover, steel disc and lithium piece are placed in glove box under an argon atmosphere in order.Then by polypropylene and poly-
The mixing diaphragm of ethylene support is placed between positive and negative anodes pole piece, and above-mentioned function electrolyte is added, covers positive cover, is sealed, and is stood,
Obtain the lithium ion battery of the present embodiment.
Embodiment 2：
According to the method for embodiment 1 lithium ion battery is prepared, unlike, the functional additive is in the electrolytic solution
Mass percent is 0.5%.
Embodiment 3：
According to the method for embodiment 1 lithium ion battery is prepared, unlike, the functional additive is in the electrolytic solution
Mass percent is 2%.
Embodiment 4：
According to the method for embodiment 1 lithium ion battery is prepared, unlike, the functional additive is in the electrolytic solution
Mass percent is 3%.
Embodiment 5：
Prepare lithium ion battery according to the method for embodiment 1, unlike, by ethylene carbonate and methyl ethyl carbonate fat according to
3:7 mass ratio mixing, obtain organic solvent and mixed with lithium hexafluoro phosphate, the lithium salt be 1.0mol/L, then again with
Functional additive 5- methylthiophene -2- boric acid mixes, and obtains the lithium-ion battery electrolytes used in the present embodiment.
Embodiment 6：
Prepare lithium ion battery according to the method for embodiment 1, unlike, by ethylene carbonate and carbonic acid diethyl ester according to
1:1 mass ratio mixing, obtain organic solvent in lithium hexafluoro phosphate mix, the lithium salts solubility be 1.2mol/L, then again with
Functional additive 5- methylthiophene -2- boric acid mixes, and obtains lithium-ion battery electrolytes used in the present embodiment.
Embodiment 7：
Adaptation silicon carbon material lithium-ion battery electrolytes are prepared according to the method for embodiment 1, unlike, lithium ion battery
Positive electrode uses cobalt acid lithium, and pole piece manufacture craft is same as Example 1, and prepared battery is soft-package battery, prepared by battery
Technique is consistent with conventional soft-package battery technique, and by anode pole piece, diaphragm, cathode pole piece is sequentially overlapped in order, injects electrolyte
2mL obtains this implementation soft bag lithium ionic cell using aluminum plastic film Vacuum Package.
The battery of the present embodiment need to add chemical synthesis technology as steps described below, first be charged to 1.5V with the electric current of 50mA, and
10h is kept in 1.5V so that electrolyte fully soaks pole piece, after the completion of constant pressure, applies a less activation current to battery,
Size of current is 10mA, and charge 10h, to form stable fine and close SEI films, is then charged to 4.2V with 50mA electric currents, connects
It and discharges into 3.0V to get to lithium ion battery described in the present embodiment.
Embodiment 8：
Soft-package battery is prepared according to the method for embodiment 7, unlike, the matter of the functional additive in the electrolytic solution
It is 3% to measure percentage.
Embodiment 9：
Soft-package battery is prepared according to the method for embodiment 7, unlike, by ethylene carbonate and methyl ethyl carbonate fat according to 5:
5 mass ratio mixing, obtains organic solvent and is mixed in dioxalic acid lithium borate, and the lithium salts solubility is 0.8mol/L.It adds simultaneously
The auxiliary additive vinylene carbonate fat VC that mass fraction is 1%.
Embodiment 10：
Soft-package battery is prepared according to the method for embodiment 7, unlike, by ethylene carbonate, methyl ethyl carbonate and carbonic acid
Two formicesters are according to 3:5:2 mass ratio mixing, obtains organic solvent and is mixed with bis trifluoromethyl sulfimide lithium, gained lithium salts is dense
Degree is 1.0mol/L.
Comparative example 1：
Electrolyte and battery are made using method same as Example 1, the difference is that obtained battery electrolyte
In do not add functional additive 5- methylthiophene -2- boric acid.
Comparative example 2：
Soft-package battery is made by the way of same as Example 7, the difference is that in obtained battery electrolyte not
Add functional additive 5- methylthiophene -2- boric acid.
Comparative example 3：
Electrolyte and battery are made using method same as Example 1, the difference is that the functional additive is
Commercially available conventional func additive vinylene carbonate VC, the mass percent of vinylene carbonate fat in the electrolytic solution are 1%.
Test analysis
Test condition is as follows：
(every group takes 20 battery testings to lithium ion half-cell made from Examples 1 to 6 and comparative example 1 and 3, as a result takes
Average value) 3-0.005V voltage range carry out cycle 300 circle, charging and discharging currents be 0.1C (1C=700mAh/g) activate three
Circle, subsequent 0.2C carry out long circulating.
(every group takes 20 battery testings to soft bag lithium ionic cell obtained by embodiment 7~10 and comparative example 2, as a result
It is averaged), it is enclosed with 0.2C (400mA) current cycle 200 in 3.0-4.2V voltage ranges.
Constant temperature carries out at 25 DEG C of room temperature for the test, and the computational methods of capacity retention ratio are that will be followed at the 300th time
The discharge capacity of ring divided by the percentage that the initial discharge capacity of cycle obtains for the first time.Experimental results are shown in Table 1.
The test result of 1 embodiment and comparative example of table
According to the data of table 1：
The cycle performance of lithium ion battery containing silicon-carbon cathode of Examples 1 to 6 is significantly better than comparative example 1.Thus illustrate this hair
Bright lithium-ion electrolyte can preferably be adapted to high-energy silicon-carbon cathode material, can obtain the better lithium-ion electric of cycle performance
Pond.
The cycle performance of lithium ion battery containing silicon-carbon cathode of Examples 1 to 6 is also superior to comparative example 3.Containing for comparative example 3 is commercially available
Conventional func additive vinylene carbonate fat electrolyte cycle performance of lithium ion battery be better than comparative example 1, but not as good as embodiment 1~
6.This cycle performance of lithium ion battery of explanation containing 5- methylthiophenes -2- boric acid functional additive electrolyte of the present invention is better than
Containing commercially available conventional func additive vinylene carbonate fat electrolyte lithium ion battery, demonstrate again that the present invention is applied to silicon carbon material
Lithium ion battery can obtain notable advantageous effect, and have breakthrough to the prior art.
The cycle performance of soft bag lithium ionic cell made from embodiment 7~10 is better than comparative example 2,7~10 battery of embodiment
Capacity retention ratio be apparently higher than comparative example 2, further illustrate the present invention the adaptation high-energy density silicon-carbon cathode lithium from
Son electrolysis liquid energy obtains the better lithium ion battery of cycle performance.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail can carry out a variety of simple variants to technical scheme of the present invention within the scope of the technical concept of the present invention, this
A little simple variants all belong to the scope of protection of the present invention.
Claims (10)
1. a kind of lithium-ion battery electrolytes of adaptation silicon carbon material, including electrolyte lithium salt, organic solvent and functional additive,
It is characterized in that：Shown in the functional additive structural formula such as formula (1)：
2. a kind of lithium-ion battery electrolytes of adaptation silicon carbon material according to claim 1, it is characterised in that：Electrolyte
In, the mass percent of a concentration of 0.8mol/L~1.2mol/L of electrolyte lithium salt, functional additive are 0.1%~5%.
3. a kind of lithium-ion battery electrolytes of adaptation silicon carbon material according to claim 2, it is characterised in that：Electrolyte
Lithium salts is lithium hexafluoro phosphate, LiBF4, lithium perchlorate, hexafluoroarsenate lithium, fluoro-alkyl lithium phosphate, fluoroalkyl sulfonic acid
At least one of lithium, lithium salts of sulfonimide, lithium-borate complexes, phosphoric acid lithium-complex.
4. a kind of lithium-ion battery electrolytes of adaptation silicon carbon material according to claim 2, it is characterised in that：Electrolyte
In, organic solvent is cyclic carbonate solvents and linear carbonate solvent with mass ratio 1：(3~0.5) mixed solvent formed.
5. a kind of lithium-ion battery electrolytes of adaptation silicon carbon material according to claim 4, it is characterised in that：It is organic molten
In agent, cyclic carbonate solvents are ethylene carbonate；Linear carbonate solvent is dimethyl carbonate, diethyl carbonate, carbonic acid first
Ethyl ester, methyl propyl carbonate, gamma-butyrolacton, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propionic acid fourth
At least one of ester.
6. a kind of lithium-ion battery electrolytes of adaptation silicon carbon material according to claim 2, it is characterised in that：Electrolyte
In, further include the auxiliary additive for accounting for electrolyte quality percentage 0~10%.
7. a kind of lithium-ion battery electrolytes of adaptation silicon carbon material according to claim 6, it is characterised in that：Auxiliary adds
It is vinylene carbonate, 1,3- propane sultones, fluorinated ethylene carbonate, fluoropropylene carbonate, ethylene carbonate Asia second to add agent
Ester, 1,4- butyl sultones, three (trimethyl) silane borates, sulfuric acid vinyl ester, propane sulfonic acid vinylene, sulfuric acid acrylic ester,
At least one of propylene sulfite.
8. a kind of preparation method of the lithium-ion battery electrolytes of adaptation silicon carbon material, it is characterised in that：Include the following steps：
1) cyclic carbonate solvents and linear carbonate solvent are mixed, purifying obtains organic solvent；
2) organic solvent that at ambient temperature, electrolyte lithium salt, functional additive, auxiliary additive and step 1) are obtained is mixed
Stirring is closed, the lithium-ion battery electrolytes of claim 1~7 any one of them adaptation silicon carbon material are obtained.
9. a kind of preparation method of the lithium-ion battery electrolytes of adaptation silicon carbon material according to claim 8, feature
It is：In step 1), the specific method of purifying is to handle mixed solvent by molecular sieve.
10. a kind of silicon-carbon cathode lithium ion battery, it is characterised in that：The electrolyte of silicon-carbon cathode lithium ion battery is claim
1~7 any one of them is adapted to the lithium-ion battery electrolytes of silicon carbon material.
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| CN109659615A (en) * | 2018-12-20 | 2019-04-19 | 河南电池研究院有限公司 | Match the lithium-ion battery electrolytes of silicon-carbon cathode material and its battery of preparation |
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| CN110459804A (en) * | 2019-07-18 | 2019-11-15 | 河南平煤国能锂电有限公司 | A kind of lithium-ion battery electrolytes |
| CN111490292A (en) * | 2020-04-18 | 2020-08-04 | 东莞东阳光科研发有限公司 | Non-aqueous electrolyte functional additive, non-aqueous electrolyte and lithium ion battery |
| CN111574545B (en) * | 2020-05-18 | 2022-07-08 | 天目湖先进储能技术研究院有限公司 | Borate compound, preparation method thereof and electrolyte containing borate compound |
| CN111574545A (en) * | 2020-05-18 | 2020-08-25 | 天目湖先进储能技术研究院有限公司 | Borate compound, preparation method thereof and electrolyte containing borate compound |
| WO2022160099A1 (en) * | 2021-01-26 | 2022-08-04 | 宁德新能源科技有限公司 | Electrolyte, electrochemical device, and electronic device |
| CN112838271A (en) * | 2021-04-16 | 2021-05-25 | 浙江金羽新能源科技有限公司 | Preparation method and preparation system of electrolyte |
| CN112838271B (en) * | 2021-04-16 | 2021-07-06 | 浙江金羽新能源科技有限公司 | Preparation method and preparation system of electrolyte |
| CN113725485A (en) * | 2021-07-22 | 2021-11-30 | 合肥国轩高科动力能源有限公司 | High-voltage lithium ion battery electrolyte and lithium ion battery |
| CN114497733A (en) * | 2021-12-15 | 2022-05-13 | 广东省豪鹏新能源科技有限公司 | Electrolyte and battery thereof |
| CN114497733B (en) * | 2021-12-15 | 2024-03-12 | 广东省豪鹏新能源科技有限公司 | Electrolyte and battery thereof |
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