CN110459804A - A kind of lithium-ion battery electrolytes - Google Patents
A kind of lithium-ion battery electrolytes Download PDFInfo
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- CN110459804A CN110459804A CN201910652183.8A CN201910652183A CN110459804A CN 110459804 A CN110459804 A CN 110459804A CN 201910652183 A CN201910652183 A CN 201910652183A CN 110459804 A CN110459804 A CN 110459804A
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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
- 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
- H01M10/056—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
- H01M10/05—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
- H01M10/0569—Liquid materials characterised by the solvents
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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
Abstract
The invention discloses a kind of lithium-ion battery electrolytes, including compound lithium salts, additive and organic solvent, the compound lithium salts is the mixture of lithium hexafluoro phosphate, di-oxalate lithium borate and trifluoromethyl sulfonic acid lithium；The additive is phenol homologue, and structural formula is
Description
Technical field
The present invention relates to field of lithium ion battery more particularly to a kind of lithium-ion battery electrolytes.
Background technique
Lithium ion battery is since its energy density is high, cycle-index is more, memory-less effect, operating temperature range are wide and ring
The advantages that border is friendly is widely used.Especially in new-energy automobile field, since the discharge of fuel-engined vehicle tail gas is to the shadow of environment
Sound is increasing, and new energy lithium ion battery automobile do not have exhaust emissions, no pollution to the environment and be concerned, therefore people
To the performance of lithium ion battery, higher requirements are also raised.
Lithium ion battery can form one layer of SEI film in negative terminal surface during initial charge.At low ambient temperatures, if
The SEI film of formation is too thick, then membrane impedance is higher, causes lithium ion mobility through being obstructed, and will occur to analyse lithium；In high temperature circulation mistake
Cheng Zhong, if the SEI film formed is not form compact and stable enough, SEI film gradually can be dissolved or be ruptured, and lead to exposed cathode and electrolyte
It reacts, but also battery capacity reduces while consuming electrolyte, the cathode that can also reduce of the SEI film formed again is followed
Ring performance.
Currently, lithium-ion battery electrolytes are mainly made of organic solvent, lithium salts and additive three parts.Wherein, lithium salts
It is general to use commercialized LiPF6And LiBF4For conductive salt.On the one hand, LiPF6And LiBF4Poorly conductive cannot be formed
Fine and close SEI film, thus result in the low efficiency for charge-discharge of lithium ion battery and the cycle performance of difference；On the other hand, single
LiPF6Or LiBF4Lithium salts system battery, efficiency for charge-discharge is low, poor circulation, while flatulence, expansion are serious, cell thickness
Increase more obvious.
Summary of the invention
The object of the present invention is to provide a kind of lithium-ion battery electrolytes, which is not only facilitated in battery cathode material
Material surface forms stable and complete SEI film, and the good cycle of battery, and production gas is appropriate in cyclic process, and battery is thick
Degree expansion is unobvious.
Technical scheme is as follows:
A kind of lithium-ion battery electrolytes, including compound lithium salts, additive and organic solvent, the compound lithium salts are hexafluoro
The mixture of lithium phosphate, di-oxalate lithium borate and trifluoromethyl sulfonic acid lithium；The additive is phenol homologue, and structural formula is such as
Shown in formula 1:
Wherein, R is hydrogen atom, halogen atom, cyano, methyl, ethyl, methoxyl group, formoxyl or acetyl group, R group position
In the ortho position of phenolic hydroxyl group, contraposition or meta position；
The organic solvent is the mixing of carbonic ester, carboxylate or both.
Preferably, the carbonic ester is ethylene carbonate, propene carbonate, dimethyl carbonate, diethyl carbonate, carbonic acid two
At least one of propyl ester, butylene carbonate, methyl ethyl carbonate.
Preferably, carboxylate is methyl formate, Ethyl formate, ethyl propionate, propyl propionate, methyl butyrate, ethyl acetate
At least one of.
Preferably, the content of compound lithium salts is 3.5-4.1mol/L in the lithium-ion battery electrolytes.
Preferably, compound lithium salts described in the lithium-ion battery electrolytes includes the substance of following mass fraction: hexafluoro
60-65 parts of lithium phosphate, 18-24 parts of di-oxalate lithium borate and 18-24 parts of trifluoromethyl sulfonic acid lithium.
Preferably, it is 0.5%- that the phenol homologue additive, which accounts for the mass percent of the lithium-ion battery electrolytes,
8%.
Beneficial effects of the present invention:
Lithium-ion battery electrolytes provided by the invention add wherein being added to the phenol homologue such as structural formula 1
Agent.There are phenolic hydroxyl groups for having in such as its phenol of the phenol homologue additive of structural formula 1 in electrolyte, and phenolic hydroxyl group is in additive
Molecule between can form stable hydrogen bond, for lithium ion battery during initial charge, additive passes through the hydrogen between molecule
Key forms stable reticular structure in negative terminal surface, and such reticular structure makes the SEI film to be formed more form compact and stable and complete
It is whole, and membrane impedance is lower, lithium ion can be migrated through successfully；Therefore it can make efficiency for charge-discharge height, the cyclicity of battery
Can be good, production gas is appropriate in cyclic process, and thickness swelling is unobvious, and such lithium ion battery is more stable, safe.
Specific embodiment
It elaborates below with reference to embodiment to the present invention.It should be noted that for these embodiments
Illustrate to be used to help understand the present invention, but and does not constitute a limitation of the invention.
Embodiment 1
The preparation of lithium-ion battery electrolytes:
By ethylene carbonate and diethyl carbonate, 4:6 is mixed by volume, and compound lithium salts is then added, makes compound lithium salts
Content is 3.8mol/L, wherein the mass fraction of each component in compound lithium salts are as follows: 60 parts of lithium hexafluoro phosphate, di-oxalate lithium borate
24 parts and 18 parts of trifluoromethyl sulfonic acid lithium, additive p-methyl phenol is then added, additive is made to account for the weight of all electrolyte
Percentage is 5%, obtains lithium-ion battery electrolytes.
The preparation of lithium ion anode pole piece:
By LiFePO4, conductive carbon black, binder polyvinylidene fluoride 96:2.5:1.5 and N- methylpyrrole in mass ratio
Alkanone is uniformly mixed and lithium ion battery anode glue size is made, and is coated in current collector aluminum foil；It is dried at 87 DEG C, then carries out roller
Pressure cutting, punching obtain anode pole piece.
The preparation of cathode pole piece:
Graphite, sodium carboxymethylcellulose, butadiene-styrene rubber 94:2:4 in mass ratio are uniformly mixed with deionized water be made it is negative
Pole slurry.Negative electrode slurry is coated on copper foil of affluxion body；It is dried at 87 DEG C；Then roll-in cutting is carried out, punching is born
Pole pole piece.
The preparation of lithium ion battery:
Using polyethylene porous polymer thin film as diaphragm；Above-mentioned anode pole piece, diaphragm, above-mentioned cathode pole piece are folded in order
Piece obtains battery core, and battery core is welded upper positive and negative tab and is fitted into aluminum plastic film bag, is existed in 90 DEG C of oven for baking to moisture
200PPM hereinafter, the above-mentioned lithium-ion battery electrolytes manufactured in the present embodiment of perfusion and seal, be then allowed to stand, be melted into, shaping, point
Hold, obtains lithium ion battery.
Cycle performance of lithium ion battery detection:
By the lithium ion battery of above-mentioned preparation, data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively,
It the results are shown in Table 1.
Embodiment 2
The preparation of lithium-ion battery electrolytes:
By propene carbonate and methyl ethyl carbonate, 4:6 is mixed by volume, and compound lithium salts is then added, makes compound lithium salts
Content is 4.1mol/L, the parts by weight of each component in compound lithium salts are as follows: 65 parts of lithium hexafluoro phosphate, 18 parts of di-oxalate lithium borate and
24 parts of trifluoromethyl sulfonic acid lithium, additive ortho-methyl phenol is then added, additive is made to account for the weight percent of all electrolyte
It is 8%, obtains lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 3
The preparation of lithium-ion battery electrolytes:
By dimethyl carbonate and dipropyl carbonate, 4:6 is mixed by volume, and compound lithium salts is then added, makes compound lithium salts
Content is 3.5mol/L, the parts by weight of each component in compound lithium salts are as follows: 63 parts of lithium hexafluoro phosphate, 21 parts of di-oxalate lithium borate and
18 parts of trifluoromethyl sulfonic acid lithium, additive m-methyl phenol is then added, additive is made to account for the weight percent of all electrolyte
It is 0.5%, obtains lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 4
The preparation of lithium-ion battery electrolytes:
By butylene carbonate and methyl formate, 4:6 is mixed by volume, and compound lithium salts is then added, makes containing for compound lithium salts
Amount is 3.8mol/L, the parts by weight of each component in compound lithium salts are as follows: 60 parts of lithium hexafluoro phosphate, 24 parts of di-oxalate lithium borate and three
18 parts of methyl fluoride Sulfonic Lithium, additive p-methyl phenol is then added, additive is made to account for the weight percent of all electrolyte
1%, obtain lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 5
The preparation of lithium-ion battery electrolytes:
By Ethyl formate and ethyl acetate, 4:6 is mixed by volume, and compound lithium salts is then added, makes the content of compound lithium salts
For 3.8mol/L, the parts by weight of each component in compound lithium salts are as follows: 60 parts of lithium hexafluoro phosphate, 24 parts of di-oxalate lithium borate and trifluoro
18 parts of methane sulfonic acid lithium, additive p methoxy phenol is then added, additive is made to account for the weight percent of all electrolyte
5%, obtain lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 6
The preparation of lithium-ion battery electrolytes:
By ethyl propionate and propyl propionate, 4:6 is mixed by volume, and compound lithium salts is then added, makes the content of compound lithium salts
For 3.8mol/L, the parts by weight of each component in compound lithium salts are as follows: 60 parts of lithium hexafluoro phosphate, 24 parts of di-oxalate lithium borate and trifluoro
18 parts of methane sulfonic acid lithium, additive ortho-methyl phenol is then added, additive is made to account for the weight percent of all electrolyte
5%, obtain lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 7
The preparation of lithium-ion battery electrolytes:
By ethylene carbonate and methyl butyrate, 1:1 is mixed by volume, and compound lithium salts is then added, makes containing for compound lithium salts
Amount is 3.8mol/L, the parts by weight of each component in compound lithium salts are as follows: 60 parts of lithium hexafluoro phosphate, 24 parts of di-oxalate lithium borate and three
18 parts of methyl fluoride Sulfonic Lithium, additive m-methyl phenol is then added, additive is made to account for the weight percent of all electrolyte
5%, obtain lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 8
The preparation of lithium-ion battery electrolytes:
By ethylene carbonate and methyl butyrate, 2:1 is mixed by volume, and compound lithium salts is then added, makes containing for compound lithium salts
Amount is 3.8mol/L, the parts by weight of each component in compound lithium salts are as follows: 60 parts of lithium hexafluoro phosphate, 24 parts of di-oxalate lithium borate and three
18 parts of methyl fluoride Sulfonic Lithium, additive m-ethylphenol is then added, additive is made to account for the weight percent of all electrolyte
5%, obtain lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 9
The preparation of lithium-ion battery electrolytes:
By propene carbonate and ethyl propionate, 1:6 is mixed by volume, and compound lithium salts is then added, makes containing for compound lithium salts
Amount is 4.1mol/L, the parts by weight of each component in compound lithium salts are as follows: 65 parts of lithium hexafluoro phosphate, 18 parts of di-oxalate lithium borate and three
24 parts of methyl fluoride Sulfonic Lithium, additive neighbour cyanophenol is then added, additive is made to account for the weight percent of all electrolyte
8%, obtain lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 10
The preparation of lithium-ion battery electrolytes:
By propene carbonate and ethyl propionate, 1:6 is mixed by volume, and compound lithium salts is then added, makes containing for compound lithium salts
Amount is 4.0mol/L, the parts by weight of each component in compound lithium salts are as follows: 65 parts of lithium hexafluoro phosphate, 18 parts of di-oxalate lithium borate and three
24 parts of methyl fluoride Sulfonic Lithium, additive is then added to formoxyl phenol, additive is made to account for the weight percent of all electrolyte
It is 7%, obtains lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 11
The preparation of lithium-ion battery electrolytes:
Compound lithium salts will be added in ethylene carbonate, makes the content 4.0mol/L of compound lithium salts, each group in compound lithium salts
The parts by weight divided are as follows: then 60 parts of lithium hexafluoro phosphate, 19 parts of di-oxalate lithium borate and 22 parts of trifluoromethyl sulfonic acid lithium are added and add
Add agent to acetyl phenol, so that additive is accounted for the weight percent 6% of all electrolyte, obtain lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 12
The preparation of lithium-ion battery electrolytes:
Compound lithium salts will be added in propene carbonate, makes the content 3.6mol/L of compound lithium salts, each group in compound lithium salts
The parts by weight divided are as follows: then 61 parts of lithium hexafluoro phosphate, 20 parts of di-oxalate lithium borate and 22 parts of trifluoromethyl sulfonic acid lithium are added and add
Add agent parachlorophenol, so that additive is accounted for the weight percent 7% of all electrolyte, obtain lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 13
The preparation of lithium-ion battery electrolytes:
Compound lithium salts will be added in propene carbonate, makes the content 3.6mol/L of compound lithium salts, each group in compound lithium salts
The parts by weight divided are as follows: then 64 parts of lithium hexafluoro phosphate, 18 parts of di-oxalate lithium borate and 24 parts of trifluoromethyl sulfonic acid lithium are added and add
Add agent o-bromophenol, so that additive is accounted for the weight percent 8% of all electrolyte, obtain lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 14
The preparation of lithium-ion battery electrolytes:
Compound lithium salts will be added in propene carbonate, makes the content 3.6mol/L of compound lithium salts, each group in compound lithium salts
The parts by weight divided are as follows: then 65 parts of lithium hexafluoro phosphate, 23 parts of di-oxalate lithium borate and 24 parts of trifluoromethyl sulfonic acid lithium are added and add
Add agent m fluorophenol, so that additive is accounted for the weight percent 8% of all electrolyte, obtain lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Embodiment 15
The preparation of lithium-ion battery electrolytes:
Compound lithium salts will be added in propene carbonate, makes the content 3.6mol/L of compound lithium salts, each group in compound lithium salts
The parts by weight divided are as follows: then 64 parts of lithium hexafluoro phosphate, 18 parts of di-oxalate lithium borate and 24 parts of trifluoromethyl sulfonic acid lithium are added and add
Add agent phenol o-iodine, so that additive is accounted for the weight percent 8% of all electrolyte, obtain lithium-ion battery electrolytes.
Using lithium-ion battery electrolytes manufactured in the present embodiment, lithium ion is made in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times respectively to lithium ion battery, it the results are shown in Table 1.
Comparative example 1
The preparation of lithium-ion battery electrolytes:
By ethylene carbonate and diethyl carbonate, 4:6 is mixed by volume, and compound lithium salts is then added, makes compound lithium salts
Content is 3.8mol/L, the parts by weight of each component in compound lithium salts are as follows: 60 parts of lithium hexafluoro phosphate, 24 parts of di-oxalate lithium borate and
18 parts of trifluoromethyl sulfonic acid lithium, obtain lithium-ion battery electrolytes.
The lithium-ion battery electrolytes prepared using this comparative example, make lithium ion in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times to lithium ion battery, it the results are shown in Table 1.
Comparative example 2
The preparation of lithium-ion battery electrolytes:
By ethylene carbonate and diethyl carbonate, 4:6 is mixed by volume, and lithium hexafluoro phosphate is then added, makes containing for lithium salts
Amount is 3.8mol/L, obtains lithium-ion battery electrolytes.
The lithium-ion battery electrolytes prepared using this comparative example, make lithium ion in the same manner as shown in Example 1
Battery, and data are recorded after 0.5C, 1C, 2C, 3C charge and discharge cycles 500 times to lithium ion battery, it the results are shown in Table 1.
Table 1
As shown in Table 1, when the battery prepared using lithium-ion battery electrolytes provided by the present invention, due to the electrolyte
In containing structural formula bePhenol homologue additive, there are phenolic hydroxyl groups in phenol, can be in additive
Stable intermolecular hydrogen bonding is formed between molecule.During initial charge, additive passes through between molecule lithium ion battery
Hydrogen bond forms stable reticular structure in negative terminal surface, and such reticular structure keeps the SEI film to be formed finer and close, stable, complete
It is whole, and membrane impedance is lower, lithium ion can be migrated through successfully, thus the circulation volume conservation rate and flatulence of lithium ion battery
Situation all when not adding than it is well very much；And it can be seen from comparative example 2 when the lithium salts in electrolyte only has a kind of, lithium
The performance ratio of ion battery uses compound lithium salts (mixture of lithium hexafluoro phosphate, di-oxalate lithium borate and trifluoromethyl sulfonic acid lithium)
The lithium ion battery of electrolyte wants poor, and the lithium-ion electrolyte of the invention using compound lithium salts improves following for lithium ion battery
Ring performance.
As long as in addition, the non-structure each other of technical characteristic involved in each embodiment of the present invention described above
It can be combined with each other at conflict.For example, in the above embodiment, the organic solvent in used electrolyte only lists
The embodiment that carbonic ester, carboxylate are used alone or are used in combination two-by-two, and in some other embodiment of the invention, it is electro-hydraulic
Solvent is ethylene carbonate, propene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, carbonic acid in carbonic ester in liquid
One of butylene, methyl ethyl carbonate, or two of them or two or more combinations；Solvent can be in electro-hydraulic liquid
One of methyl formate, Ethyl formate, ethyl propionate, propyl propionate, methyl butyrate, ethyl acetate in carboxylate or its
In two kinds or two or more combinations, it is of course also possible to be one of above listed carbonic ester or a variety of with the above institute
One of carboxylate of column or a variety of combinations.For another example, the phenol homology as additive is only listed in above embodiments
It is several in object, and for the present invention, structural formula is such asAdditive in, R can be former for hydrogen atom, halogen
Son, cyano, methyl, ethyl, methoxyl group, formoxyl, acetyl group, and the R group can be located at hydroxyl ortho position, contraposition or
Position.
In addition the above is only section Example of the invention, rather than whole embodiments, based on the embodiments of the present invention,
Those of ordinary skill in the art's every other embodiment obtained without making creative work belongs to this
Invent the range of protection.
Claims (6)
1. a kind of lithium-ion battery electrolytes, including compound lithium salts, additive and organic solvent, which is characterized in that
The compound lithium salts is the mixture of lithium hexafluoro phosphate, di-oxalate lithium borate and trifluoromethyl sulfonic acid lithium；
The additive is phenol homologue, structural formula are as follows:
Wherein, R is hydrogen atom, halogen atom, cyano, methyl, ethyl, methoxyl group, formoxyl or acetyl group, the R group position
In the ortho position of phenolic hydroxyl group, contraposition or meta position；
The organic solvent is the mixing of carbonic ester, carboxylate or both.
2. lithium-ion battery electrolytes as described in claim 1, which is characterized in that the carbonic ester is ethylene carbonate, carbon
At least one of acid propylene ester, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, butylene carbonate, methyl ethyl carbonate.
3. lithium-ion battery electrolytes as described in claim 1, which is characterized in that the carboxylate is methyl formate, formic acid
At least one of ethyl ester, ethyl propionate, propyl propionate, methyl butyrate, ethyl acetate.
4. lithium-ion battery electrolytes as described in claim 1, which is characterized in that compound in the lithium-ion battery electrolytes
The content of lithium salts is 3.5-4.1mol/L.
5. lithium-ion battery electrolytes as described in claim 1, which is characterized in that described in the lithium-ion battery electrolytes
Compound lithium salts includes the substance of following mass fraction: 60-65 parts of lithium hexafluoro phosphate, 18-24 parts of di-oxalate lithium borate and fluoroform
18-24 parts of base Sulfonic Lithium.
6. lithium-ion battery electrolytes as described in claim 1, which is characterized in that the phenol homologue additive accounts for described
The mass percent of lithium-ion battery electrolytes is 0.5%-8%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934009A (en) * | 2020-07-14 | 2020-11-13 | 华中科技大学 | High-voltage-resistant quick-charging lithium ion battery electrolyte and preparation method and application thereof |
| CN113745660A (en) * | 2021-09-06 | 2021-12-03 | 广州天赐高新材料股份有限公司 | Electrolyte additive, electrolyte and lithium secondary battery |
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