CN108767310A - A kind of lithium-ion battery electrolytes, lithium ion battery - Google Patents
A kind of lithium-ion battery electrolytes, lithium ion battery Download PDFInfo
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- CN108767310A CN108767310A CN201810509027.1A CN201810509027A CN108767310A CN 108767310 A CN108767310 A CN 108767310A CN 201810509027 A CN201810509027 A CN 201810509027A CN 108767310 A CN108767310 A CN 108767310A
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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 present invention relates to a kind of lithium-ion battery electrolytes, lithium ion batteries, belong to technical field of lithium ion.The lithium-ion battery electrolytes of the present invention, including organic solvent, electrolyte lithium salt, Low ESR additive and functional additive, the Low ESR additive is made of difluorophosphate and the double oxalic acid lithium phosphates of difluoro, and the functional additive is any one or combination in three (trimethyl silane) borates, three (trimethyl silane) phosphates；The functional additive accounts for the 0.1~4% of lithium-ion battery electrolytes gross mass.The lithium-ion battery electrolytes of the present invention, may participate in cathode film formation, reduce the interface impedance of electrolyte, promote the cryogenic property of electrolyte；Flexible, high-temperature stable sector electrode facial mask can also be formed on high power capacity silicon-carbon composite cathode material surface, and repair the SEI films as caused by expanding silicon in time in cyclic process and rupture, improve silicon-carbon cathode cycle performance of lithium ion battery.
Description
Technical field
The present invention relates to a kind of lithium-ion battery electrolytes, lithium ion batteries, belong to technical field of lithium ion.
Background technology
Lithium ion battery has received since the 1990s realizes commercialization by the superior performance of its various aspects
Extensive concern.However as the gradually development of electric vehicle, people also proposed higher to the energy density of lithium ion battery
Requirement.
Commercial lithium ion battery negative material uses graphite cathode material at present, and charging and discharging capacity is relatively low, theoretical
Capacity is 372mAh/g, has not adapted to demand of the current electric vehicle to high-energy density electrochmical power source.Silica-base material is because of it
Theoretical specific capacity height (4200mAh/g) and lower de- lithium current potential (<0.5V), while rich content, it has also become substitute graphite-like
One of optimal candidate material of negative material.But silicon is semi-conducting material, and the conductivity of itself is relatively low, and silicium cathode is filling
Huge volume change can occur in discharge process, be difficult to form stable solid electrolyte interface (SEI) film in the electrolytic solution,
Eventually lead to the destruction for the solid liquid interface layer of silica-base material structure collapsed between silica-base material and electrolyte.
It is LiPF in electrolyte to lead to one of silicium cathode capacity attenuation major reason6It decomposes and generates micro HF to silicon
It causes to corrode.Further, since silicium cathode is in conventional LiPF6It is difficult to form stable solid electrolyte interface in electrolyte
(SEI) film constantly forms new SEI films in the silicon face exposed, exacerbates the corrosion of silicon along with the destruction of electrode structure
And capacity attenuation.Therefore, it is necessary to develop the electrolyte technology for being suitable for lithium battery silicium cathode.In the prior art, application publication number
A kind of high-capacity lithium ion cell electrolyte for taking into account high temperature performance is disclosed for the Chinese invention patent of CN106252639A,
The electrolyte includes nonaqueous solvents, lithium hexafluoro phosphate, film for additive, inhibits inflatable agent and Low ESR additive；Wherein cathode
Film for additive accounts for 3~15% fluoroacetate composition of electrolyte gross mass；Inhibit inflatable additive total by accounting for electrolyte
One or both of the 1,3- propene sultones of quality 0.3~5%, anhydride compound composition；Low ESR additive by
Account for one or both of difluorophosphate, difluoro oxalate lithium phosphate of electrolyte gross mass 0.2~3% composition.The electrolyte
The synergistic effect between inflatable additive and Low ESR additive is inhibited to take into account battery high-temperature behavior and low temperature properties by addition
Can, but the cryogenic property of the electrolyte described in above-mentioned technology is only cycle performance at 5 DEG C, and silicone content≤8%, Wu Faman
Demand and broader Range of measuring temp of the sufficient battery for high-energy density, therefore be badly in need of developing silicone content higher and not
In the better silicon-based anode electrolyte of 0 DEG C or less cryogenic property on the basis of deterioration high-temperature behavior.
Invention content
The object of the present invention is to provide a kind of lithium-ion battery electrolytes, can greatly promote silicon-carbon cathode lithium-ion electric
The low-temperature circulating performance in pond.
The present invention also provides a kind of lithium ion batteries using above-mentioned lithium-ion battery electrolytes.
In order to achieve the goal above, technical solution used by the lithium-ion battery electrolytes of the present invention is：
A kind of lithium-ion battery electrolytes, including organic solvent, electrolyte lithium salt, Low ESR additive and functional addition
Agent, the Low ESR additive are made of difluorophosphate and the double oxalic acid lithium phosphates of difluoro, and the functional additive is three (three
Methyl-monosilane) borate, any one or combination in three (trimethyl silane) phosphates；The functional additive account for lithium from
The 0.1~4% of sub- battery electrolyte gross mass.
Preferably, the lithium-ion battery electrolytes are used as the electrolyte of silicon-carbon cathode lithium ion battery.
The lithium-ion battery electrolytes of the present invention, by the way that Low ESR additive and functional addition are added in the electrolytic solution
Agent can effectively participate in cathode film formation, reduce the interface impedance of electrolyte, promote the cryogenic property of electrolyte；It can also be in height
Capacity silicon-carbon composite cathode material surface forms flexible, high-temperature stable sector electrode facial mask, and is repaired in time in cyclic process
SEI films rupture as caused by expanding silicon, so as to improve silicon-carbon cathode cycle performance of lithium ion battery.
The quality sum of the Low ESR additive and functional additive accounts for the 0.3 of lithium-ion battery electrolytes gross mass
~8%.
The difluorophosphate accounts for the 0.1~2% of lithium-ion battery electrolytes gross mass.
The double oxalic acid lithium phosphates of the difluoro account for the 0.1~2% of lithium-ion battery electrolytes gross mass.
The organic solvent be ethylene carbonate, diethyl carbonate, dimethyl carbonate, propene carbonate, methyl ethyl carbonate,
Any one in fluorinated ethylene carbonate or combination.
Preferably, the organic solvent is by ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate
Composition；The ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate mass ratio be 15~25:45
~55:15~25:7~14.
Preferably, the organic solvent is by propene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate
Composition；The propene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate mass ratio be 15~25:45
~55:15~25:7~14.
The electrolyte lithium salt is in lithium hexafluoro phosphate, bis- (fluorine sulphonyl) imine lithiums, bis- (trimethyl fluoride sulfonyl) imine lithiums
Any one or combination.
A concentration of 0.9~1.2mol/L of the electrolyte lithium salt in lithium-ion battery electrolytes.
Technical solution is used by the lithium ion battery of the present invention：
A kind of lithium ion battery, including diaphragm, anode pole piece, cathode pole piece and electrolyte, the electrolyte are above-mentioned
Lithium-ion battery electrolytes.
The lithium ion battery of the present invention, lithium-ion battery electrolytes using the present invention can be effectively reduced impedance, carry
The low-temperature circulating performance of high-lithium ion battery, can especially improve the stability of silicon-carbon composite cathode surface SEI films, carry significantly
Rise the cycle performance of silicon-carbon cathode lithium ion battery at low temperature.
The anode pole piece includes plus plate current-collecting body and the positive electrode active material layer that is arranged on plus plate current-collecting body, it is described just
Pole active material layer includes positive active material, and the positive active material is LiNixCoyMezO2Ternary material, wherein Me are
Mn or Al, x+y+z=1,0.6≤x≤0.8, y > 0, z > 0.
The cathode pole piece includes negative current collector and the negative electrode active material layer that is arranged on negative current collector, described negative
Pole active material layer includes negative electrode active material, and the negative electrode active material is silicon-carbon composite cathode material, and silicon-carbon cathode is compound
The mass percentage of element silicon is not more than 20% in material.
Preferably, the mass percentage of element silicon is 10~20% in the silicon-carbon composite cathode material.It is further excellent
Choosing, the mass percentage of element silicon is 10~15% in the silicon-carbon composite cathode material.
Preferably, the diaphragm includes that polyalkene diaphragm matrix and the ceramics coated in the polyalkene diaphragm surface apply
Layer.Further, the diaphragm includes polyalkene diaphragm matrix and coated in the ceramic coating in polyalkene diaphragm matrix one side.
The quality sum of the Low ESR additive and functional additive accounts for the 0.3 of lithium-ion battery electrolytes gross mass
~8%.
The difluorophosphate accounts for the 0.1~2% of lithium-ion battery electrolytes gross mass.
The double oxalic acid lithium phosphates of the difluoro account for the 0.1~2% of lithium-ion battery electrolytes gross mass.
The organic solvent be ethylene carbonate, diethyl carbonate, dimethyl carbonate, propene carbonate, methyl ethyl carbonate,
Any one in fluorinated ethylene carbonate or combination.
Preferably, the organic solvent is by ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate
Composition；The ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate mass ratio be 15~25:45
~55:15~25:7~14.
Preferably, the organic solvent is by propene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate
Composition；The propene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate mass ratio be 15~25:45
~55:15~25:7~14.
The electrolyte lithium salt is in lithium hexafluoro phosphate, bis- (fluorine sulphonyl) imine lithiums, bis- (trimethyl fluoride sulfonyl) imine lithiums
Any one or combination.
A concentration of 0.9~1.2mol/L of the electrolyte lithium salt in lithium-ion battery electrolytes.
Specific implementation mode
Below in conjunction with specific implementation mode to technical scheme of the present invention institute further instruction.
Embodiment 1
The lithium-ion battery electrolytes of the present embodiment are by organic solvent, electrolyte lithium salt, Low ESR additive and functionality
Additive forms；Used lithium salts is lithium hexafluoro phosphate；Used Low ESR additive is double by difluorophosphate and difluoro
Oxalic acid lithium phosphate forms；Used functional additive is three (trimethyl silane) borates；Used organic solvent by
Ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate composition, ethylene carbonate 20%, methyl ethyl carbonate
The mass ratio of ester 50%, diethyl carbonate and fluorinated ethylene carbonate is 20:50:20:10；In lithium-ion battery electrolytes, electricity
A concentration of 1.0mol/L of matter lithium salts is solved, the mass fraction of difluorophosphate is 0.5%, the quality point of the double oxalic acid lithium phosphates of difluoro
Number is 1%, and the mass fraction of functional additive is 0.5%.
Lithium-ion battery electrolytes in the present embodiment are by electrolyte lithium salt, Low ESR additive and functional additive
It is uniformly mixed so as to obtain in addition organic solvent.
The lithium ion battery of the present embodiment, including anode pole piece, cathode pole piece, diaphragm and electrolyte；Used electrolysis
Liquid is the lithium-ion battery electrolytes of the present embodiment；Used anode pole piece includes plus plate current-collecting body and is arranged in anode collection
Positive electrode material layer on body, positive electrode material layer include positive active material, positive active material LiNi0.8Co0.1Mn0.1O2；Institute
The cathode pole piece of use includes negative current collector and the negative electrode active material layer that is arranged on negative current collector, negative electrode active material
Layer includes negative electrode active material, and negative electrode active material is silicon-carbon composite cathode material, and the mass percentage of wherein element silicon is
15%；Used diaphragm includes polyalkene diaphragm matrix and coated in the ceramic coating in polyalkene diaphragm matrix one side.It will
After anode pole piece, diaphragm, cathode pole piece are assembled according to method in the prior art, electrolyte is injected, you can the present embodiment is made
Lithium ion battery.
Embodiment 2
The lithium-ion battery electrolytes of the present embodiment are by organic solvent, electrolyte lithium salt, Low ESR additive and functionality
Additive forms；Used lithium salts is lithium hexafluoro phosphate；Used Low ESR additive is double by difluorophosphate and difluoro
Oxalic acid lithium phosphate forms；Used functional additive is three (trimethyl silane) phosphates；Used organic solvent by
Propene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate composition, propene carbonate, methyl ethyl carbonate, carbon
The mass ratio of diethyl phthalate and fluorinated ethylene carbonate is 20:50:20:10；In lithium-ion battery electrolytes, electrolyte lithium salt
The mass fraction of a concentration of 1.0mol/L, difluorophosphate are 0.5%, and the mass fraction of the double oxalic acid lithium phosphates of difluoro is 1%, work(
The mass fraction of energy property additive is 0.5%.
Lithium-ion battery electrolytes in the present embodiment are by electrolyte lithium salt, Low ESR additive and functional additive
It is uniformly mixed so as to obtain in addition organic solvent.
The lithium ion battery of the present embodiment, except used electrolyte is the lithium-ion battery electrolytes of the present embodiment,
It is remaining completely with embodiment 1.
Embodiment 3
The lithium-ion battery electrolytes of the present embodiment are by organic solvent, electrolyte lithium salt, Low ESR additive and functionality
Additive forms；Used lithium salts is made of bis- (fluorine sulphonyl) imine lithiums of lithium hexafluoro phosphate；Used Low ESR additive
It is made of difluorophosphate and the double oxalic acid lithium phosphates of difluoro；Used functional additive is three (trimethyl silane) boric acid
Ester；Used organic solvent is made of ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate, carbon
Vinyl acetate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate mass ratio be 20:50:20:10；Lithium-ion electric
In the electrolyte of pond, a concentration of 0.9mol/L of lithium hexafluoro phosphate, a concentration of 0.1mol/L of bis- (fluorine sulphonyl) imine lithiums, difluoro phosphorus
The mass fraction of sour lithium is 0.5%, and the mass fraction of the double oxalic acid lithium phosphates of difluoro is 0.5%, the quality point of functional additive
Number is 0.5%.
Lithium-ion battery electrolytes in the present embodiment are by electrolyte lithium salt, Low ESR additive and functional additive
It is uniformly mixed so as to obtain in addition organic solvent.
The lithium ion battery of the present embodiment, except used electrolyte is the lithium-ion battery electrolytes of the present embodiment,
It is remaining completely with embodiment 1.
Embodiment 4
The lithium-ion battery electrolytes of the present embodiment are by organic solvent, electrolyte lithium salt, Low ESR additive and functionality
Additive forms；Used lithium salts is that lithium hexafluoro phosphate and bis- (fluorine sulphonyl) imine lithiums form；Used Low ESR addition
Agent is made of difluorophosphate and the double oxalic acid lithium phosphates of difluoro；Used functional additive is three (trimethyl silane) boric acid
Ester；Used organic solvent is made of ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate, carbon
Vinyl acetate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate mass ratio be 20:50:20:10；Lithium-ion electric
In the electrolyte of pond, a concentration of 0.9mol/L of lithium hexafluoro phosphate, a concentration of 0.1mol/L of bis- (fluorine sulphonyl) imine lithiums, difluoro phosphorus
The mass fraction of sour lithium is 0.5%, and the mass fraction of the double oxalic acid lithium phosphates of difluoro is 1%, the mass fraction of functional additive
It is 0.5%.
Lithium-ion battery electrolytes in the present embodiment are by electrolyte lithium salt, Low ESR additive and functional additive
It is uniformly mixed so as to obtain in addition organic solvent.
The lithium ion battery of the present embodiment, except used electrolyte is the lithium-ion battery electrolytes of the present embodiment,
It is remaining completely with embodiment 1.
Embodiment 5
The lithium-ion battery electrolytes of the present embodiment are by organic solvent, electrolyte lithium salt, Low ESR additive and functionality
Additive forms；Used lithium salts is lithium hexafluoro phosphate；Used Low ESR additive is double by difluorophosphate and difluoro
Oxalic acid lithium phosphate forms；Used functional additive is three (trimethyl silane) phosphates；Used organic solvent by
Ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate composition, ethylene carbonate, methyl ethyl carbonate, carbon
The mass ratio of diethyl phthalate and fluorinated ethylene carbonate is 20:50:20:10；In lithium-ion battery electrolytes, electrolyte lithium salt
The mass fraction of a concentration of 1.0mol/L, difluorophosphate are 0.5%, and the mass fraction of the double oxalic acid lithium phosphates of difluoro is 1%, work(
The mass fraction of energy property additive is 0.5%.
Lithium-ion battery electrolytes in the present embodiment are by electrolyte lithium salt, Low ESR additive and functional additive
It is uniformly mixed so as to obtain in addition organic solvent.
The lithium ion battery of the present embodiment, except used electrolyte is the lithium-ion battery electrolytes of the present embodiment,
It is remaining completely with embodiment 1.
Embodiment 6
The lithium-ion battery electrolytes of the present embodiment are by organic solvent, electrolyte lithium salt, Low ESR additive and functionality
Additive forms；Used lithium salts is lithium hexafluoro phosphate；Used Low ESR additive is double by difluorophosphate and difluoro
Oxalic acid lithium phosphate forms；Used functional additive is by three (trimethyl silane) phosphates and three (trimethyl silicon substrate) boric acid
Ester forms, and the mass ratio of three (trimethyl silicon substrate) borates and three (trimethyl silicon substrate) phosphates is 1:1；It is used organic
Solvent is made of ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate, ethylene carbonate, carbonic acid first
The mass ratio of ethyl ester, diethyl carbonate and fluorinated ethylene carbonate is 20:50:20:10；In lithium-ion battery electrolytes, electrolysis
The mass fraction of a concentration of 1.0mol/L of matter lithium salts, difluorophosphate are 0.1%, the mass fraction of the double oxalic acid lithium phosphates of difluoro
It is 0.1%, the mass fraction of functional additive is 0.1%.
Lithium-ion battery electrolytes in the present embodiment are by electrolyte lithium salt, Low ESR additive and functional additive
It is uniformly mixed so as to obtain in addition organic solvent.
The lithium ion battery of the present embodiment, including anode pole piece, cathode pole piece, diaphragm and electrolyte；Used electrolysis
Liquid is the lithium-ion battery electrolytes of the present embodiment；Used anode pole piece includes plus plate current-collecting body and is arranged in anode collection
Positive electrode material layer on body, positive electrode material layer include positive active material, positive active material LiNi0.8Co0.1Mn0.1O2；Institute
The cathode pole piece of use includes negative current collector and the negative electrode active material layer that is arranged on negative current collector, negative electrode active material
Layer includes negative electrode active material, and negative electrode active material is silicon-carbon composite cathode material, and the mass percentage of wherein element silicon is
15%；Used diaphragm is 2400 films of Celgard.After anode pole piece, diaphragm, cathode pole piece assembling, electrolyte is injected,
It can be prepared by the lithium ion battery of the present embodiment.
Embodiment 7
The lithium-ion battery electrolytes of the present embodiment are by organic solvent, electrolyte lithium salt, Low ESR additive and functionality
Additive forms；Used lithium salts is lithium hexafluoro phosphate；Used Low ESR additive is double by difluorophosphate and difluoro
Oxalic acid lithium phosphate forms；Used functional additive is three (trimethyl silane) phosphates；Used organic solvent by
Ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and fluorinated ethylene carbonate composition, ethylene carbonate, methyl ethyl carbonate, carbon
The mass ratio of diethyl phthalate and fluorinated ethylene carbonate is 20:50:20:10；In lithium-ion battery electrolytes, electrolyte lithium salt
The mass fraction of a concentration of 0.9mol/L, difluorophosphate are 1%, and the mass fraction of the double oxalic acid lithium phosphates of difluoro is 1%, function
Property additive mass fraction be 2%.
Lithium-ion battery electrolytes in the present embodiment are by electrolyte lithium salt, Low ESR additive and functional additive
It is uniformly mixed so as to obtain in addition organic solvent.
The lithium ion battery of the present embodiment except the lithium-ion battery electrolytes that used electrolyte is the present embodiment, is adopted
Outside the silicon-carbon composite cathode material for being 20% with silicone content, remaining is completely the same as embodiment 6.
Embodiment 8
The lithium-ion battery electrolytes of the present embodiment are by organic solvent, electrolyte lithium salt, Low ESR additive and functionality
Additive forms；Used lithium salts is lithium hexafluoro phosphate；Used Low ESR additive is double by difluorophosphate and difluoro
Oxalic acid lithium phosphate forms；Used functional additive is by three (trimethyl silane) borates and three (trimethyl silane) phosphoric acid
Ester forms, and the mass ratio of three (trimethyl silane) borates and three (trimethyl silane) phosphates is 1:1；It is used organic molten
Agent is made of ethylene carbonate, methyl ethyl carbonate, diethyl carbonate, fluorinated ethylene carbonate, ethylene carbonate, methyl ethyl carbonate
The mass ratio of ester, diethyl carbonate and fluorinated ethylene carbonate is 20:50:20:10；In lithium-ion battery electrolytes, electrolyte
The mass fraction of a concentration of 1.2mol/L of lithium salts, difluorophosphate are 2%, and the mass fraction of the double oxalic acid lithium phosphates of difluoro is
2%, the mass fraction of functional additive is 4%.
Lithium-ion battery electrolytes in the present embodiment are by electrolyte lithium salt, Low ESR additive and functional additive
It is uniformly mixed so as to obtain in addition organic solvent.
The lithium ion battery of the present embodiment, except used electrolyte is the lithium-ion battery electrolytes of the present embodiment,
It is remaining completely with embodiment 6.
Comparative example
The lithium-ion battery electrolytes of comparative example are made of electrolyte lithium salt and organic solvent；Used electrolyte lithium salt
For lithium hexafluoro phosphate；Used organic solvent is by ethylene carbonate (EC), methyl ethyl carbonate (EMC) and diethyl carbonate
(DEC) it is 3 according to volume ratio:5:2 ratio is mixed to get；Electrolyte lithium salt is a concentration of in lithium-ion battery electrolytes
1.0mol/L。
The lithium ion battery of comparative example, in addition to the electrolyte used is the electrolyte of this comparative example, remaining is completely the same as implementation
Example 5.
Experimental example
Respectively the lithium ion battery of testing example 1~8 and comparative example recycled at -10 DEG C and 45 DEG C 50 times it is later
Capacity retention ratio, the charge/discharge multiplying power tested at -10 DEG C are 0.2C/0.3C, the charge/discharge tested at 45 DEG C times
Rate is 0.5C/0.5C, and test result is shown in Table 1.
The cycle performance test result of the lithium ion battery of 1 Examples 1 to 8 of table and comparative example
It, can by data in table 1 it is found that the low-temperature circulating performance of the lithium ion battery of Examples 1 to 8 is substantially better than comparative example
Know being used cooperatively by Low ESR additive and functional form additive, and the optimization of cooperation lithium salts and solvent, can change significantly
The interface film forming of kind silicon-carbon cathode, the interface impedance reduced under low temperature widen silicon-carbon lithium to promote the cryogenic property of electrolyte
The application field of ion battery.
Claims (10)
1. a kind of lithium-ion battery electrolytes, it is characterised in that：Including organic solvent, electrolyte lithium salt, Low ESR additive and
Functional additive, the Low ESR additive are made of difluorophosphate and the double oxalic acid lithium phosphates of difluoro, and the functionality adds
It is three (trimethyl silane) borates, any one or combination in three (trimethyl silane) phosphates to add agent；The functionality
Additive accounts for the 0.1~4% of lithium-ion battery electrolytes gross mass.
2. lithium-ion battery electrolytes according to claim 1, it is characterised in that：The Low ESR additive and functionality
The quality sum of additive accounts for the 0.3~8% of lithium-ion battery electrolytes gross mass.
3. lithium-ion battery electrolytes according to claim 1, it is characterised in that：The difluorophosphate accounts for lithium-ion electric
The 0.1~2% of pond electrolyte gross mass.
4. lithium-ion battery electrolytes according to claim 1, it is characterised in that：The double oxalic acid lithium phosphates of the difluoro account for lithium
The 0.1~2% of ion battery electrolyte gross mass.
5. lithium-ion battery electrolytes according to claim 1, it is characterised in that：The organic solvent is ethylene carbonate
Any one in ester, diethyl carbonate, dimethyl carbonate, propene carbonate, methyl ethyl carbonate, fluorinated ethylene carbonate or group
It closes.
6. lithium-ion battery electrolytes according to claim 1, it is characterised in that：The electrolyte lithium salt is hexafluorophosphoric acid
Any one in lithium, bis- (fluorine sulphonyl) imine lithiums, bis- (trimethyl fluoride sulfonyl) imine lithiums or combination.
7. lithium-ion battery electrolytes according to claim 1, it is characterised in that：The electrolyte lithium salt is in lithium-ion electric
A concentration of 0.9~1.2mol/L in the electrolyte of pond.
8. a kind of lithium ion battery, including diaphragm, anode pole piece, cathode pole piece and electrolyte, it is characterised in that：The electrolyte
For lithium-ion battery electrolytes as described in claim 1.
9. lithium ion battery according to claim 8, it is characterised in that：The anode pole piece includes plus plate current-collecting body and sets
The positive electrode active material layer on plus plate current-collecting body is set, the positive electrode active material layer includes positive active material, the anode
Active material is LiNixCoyMezO2Ternary material, wherein Me are Mn or Al, x+y+z=1,0.6≤x≤0.8, y > 0, z > 0.
10. lithium ion battery according to claim 8, it is characterised in that：The cathode pole piece include negative current collector and
The negative electrode active material layer being arranged on negative current collector, the negative electrode active material layer include negative electrode active material, described negative
Pole active material is silicon-carbon composite cathode material, and the mass percentage of element silicon is not more than in silicon-carbon cathode composite material
20%.
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| CN110048161A (en) * | 2019-03-29 | 2019-07-23 | 欣旺达电动汽车电池有限公司 | A kind of lithium-ion battery electrolytes and preparation method thereof |
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| CN111640982A (en) * | 2020-05-18 | 2020-09-08 | 珠海冠宇电池股份有限公司 | Electrolyte for lithium ion battery and lithium ion battery comprising same |
| CN111640982B (en) * | 2020-05-18 | 2021-10-26 | 珠海冠宇电池股份有限公司 | Electrolyte for lithium ion battery and lithium ion battery comprising same |
| CN111916825A (en) * | 2020-06-30 | 2020-11-10 | 珠海冠宇电池股份有限公司 | Non-aqueous electrolyte for lithium ion battery and lithium ion battery using same |
| CN111916825B (en) * | 2020-06-30 | 2022-03-18 | 珠海冠宇电池股份有限公司 | Non-aqueous electrolyte for lithium ion battery and lithium ion battery using same |
| CN112086684A (en) * | 2020-09-16 | 2020-12-15 | 松山湖材料实验室 | Cesium-containing high-voltage lithium ion battery electrolyte composite additive, electrolyte and battery thereof |
| CN112151866B (en) * | 2020-10-19 | 2022-08-30 | 珠海冠宇电池股份有限公司 | Electrolyte for lithium ion battery and lithium ion battery comprising same |
| CN112151866A (en) * | 2020-10-19 | 2020-12-29 | 珠海冠宇电池股份有限公司 | Electrolyte for lithium ion battery and lithium ion battery comprising same |
| CN112271338A (en) * | 2020-11-27 | 2021-01-26 | 凯博能源科技有限公司 | Electrolyte and lithium ion battery containing same |
| CN113161617A (en) * | 2021-03-26 | 2021-07-23 | 天津市捷威动力工业有限公司 | Low-temperature lithium ion battery electrolyte and lithium ion battery thereof |
| WO2022222420A1 (en) * | 2021-04-21 | 2022-10-27 | 广州天赐高新材料股份有限公司 | New use of substituted silicon-based phosphate compound, electrolyte, and lithium ion battery |
| US11909000B2 (en) | 2021-05-28 | 2024-02-20 | Contemporary Amperex Technology Co., Limited | Lithium-ion secondary battery, battery module, battery pack, and powered device |
| EP4120418A4 (en) * | 2021-05-28 | 2023-04-05 | Contemporary Amperex Technology Co., Limited | Lithium-ion secondary battery, battery module, battery pack, and electrical device |
| CN113659205A (en) * | 2021-08-12 | 2021-11-16 | 湖州昆仑亿恩科电池材料有限公司 | Lithium ion battery non-aqueous electrolyte and lithium ion battery |
| CN113793918A (en) * | 2021-09-08 | 2021-12-14 | 远景动力技术(江苏)有限公司 | Lithium ion battery and preparation method thereof |
| CN113937361A (en) * | 2021-11-16 | 2022-01-14 | 远景动力技术(江苏)有限公司 | Preparation method and application of long-circulating non-aqueous electrolyte of energy storage battery cell |
| CN114566712A (en) * | 2022-03-03 | 2022-05-31 | 湖北亿纬动力有限公司 | High-voltage lithium ion battery electrolyte containing lithium difluorophosphate, preparation method thereof and lithium ion battery |
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