CN105529494B - Non-aqueous electrolyte and lithium ion battery - Google Patents
Non-aqueous electrolyte and lithium ion battery Download PDFInfo
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- CN105529494B CN105529494B CN201410515864.7A CN201410515864A CN105529494B CN 105529494 B CN105529494 B CN 105529494B CN 201410515864 A CN201410515864 A CN 201410515864A CN 105529494 B CN105529494 B CN 105529494B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a non-aqueous electrolyte and a lithium ion battery. The nonaqueous electrolytic solution includes: a lithium salt; a non-aqueous organic solvent; and additives. The additive comprises: lithium tetrafluoroborate (LiBF)4) (ii) a And one or more compounds with the structure of formula I; in formula I, R1、R2、R3Independently selected from one of aliphatic alkyl group having 1 to 5 carbon atoms, phenyl group and alkylbenzene having alkyl group having 1 to 3 carbon atoms as a substituent. The lithium ion battery comprises the nonaqueous electrolyte. The lithium ion battery provided by the invention has excellent high-temperature storage performance, cycle performance and rate capability.
Description
Technical field
The present invention relates to battery technology field more particularly to a kind of nonaqueous electrolytic solutions and lithium ion battery.
Background technique
Lithium ion battery has that energy density is high, operating voltage is high, self-discharge rate is low, has extended cycle life, is pollution-free etc. solely
Special advantage, has been used as power supply to be widely used in the electronic products such as camera, mobile phone.In recent years, with smart electronics product
Fast development, to the cruising ability of lithium ion battery, more stringent requirements are proposed.In order to improve the energy density of lithium ion battery,
Developing high-voltage lithium ion batteries is one of effective ways, currently, lithium ion battery of the operating voltage in 4.35V or more has become
The hot spot of numerous R&D institutions and business research.However under high voltages, positive oxidation activity is got higher, and nonaqueous electrolytic solution is easy
Electrochemical oxidation reactions occur for positive electrode surface, and then decompose and generate gas, meanwhile, positive transition metal element (such as nickel, cobalt, manganese
Deng) reduction reaction can occur and dissolve out, the chemical property so as to cause lithium ion battery deteriorates and then causes to fail.As it can be seen that
Overcome nonaqueous electrolytic solution in the Important Problems that the oxygenolysis of positive electrode surface is exploitation high-voltage lithium ion batteries.
Summary of the invention
In view of the problems in the background art, the purpose of the present invention is to provide a kind of nonaqueous electrolytic solution and lithium-ion electrics
Pond, the lithium ion battery have excellent high-temperature storage performance, cycle performance and high rate performance.
To achieve the goals above, in the first aspect of the present invention, the present invention provides a kind of nonaqueous electrolytic solutions, comprising:
Lithium salts；Non-aqueous organic solvent；And additive.The additive includes: LiBF4 (LiBF4)；And there is structure shown in formula I
One or more of compound；
In formula I, R1、R2、R3Independently selected from aliphatic alkyl, phenyl and with 1-3 with 1-5 carbon atom
Alkylbenzene one of of the alkyl of carbon atom as substituent group.
In the second aspect of the present invention, the present invention provides a kind of lithium ion batteries, comprising: positive plate, including anode collection
It fluid and is set on plus plate current-collecting body and positive diaphragm containing a positive electrode active material；Negative electrode tab, including negative current collector and
It is set on negative current collector and cathode membrane containing a negative electrode active material；Isolation film, be interval in positive plate and negative electrode tab it
Between；Nonaqueous electrolytic solution；And package foil.Wherein, the nonaqueous electrolytic solution is the nonaqueous electrolytic solution according to first aspect present invention.
Compared with the existing technology, the invention has the benefit that
LiBF is added simultaneously in nonaqueous electrolytic solution of the invention4With the compound with Formulas I structure, on the one hand, have
The compound of Formulas I structure can generate complexing with the transition metal element in positive electrode active materials and form stable bidentate complexing
Structure reduces positive electrode active materials so as to reduce the redox reaction between positive electrode active materials and nonaqueous electrolytic solution
The dissolution of middle transition metal element, improves the stability of positive electrode active materials, and then effectively improves the high temperature of lithium ion battery
Storage performance and cycle performance；On the other hand, LiBF4Low ESR film can be generated in surface of positive electrode active material, to significantly drop
The impedance of low positive electrode surface electrochemical reaction improves the high-temperature storage performance of lithium ion battery and cycle performance same
When, the high rate performance of lithium ion battery will not be deteriorated.
Specific embodiment
The following detailed description of nonaqueous electrolytic solution according to the present invention and lithium ion battery and comparative example, embodiment and test
As a result.
Illustrate nonaqueous electrolytic solution according to a first aspect of the present invention first.
Nonaqueous electrolytic solution according to a first aspect of the present invention, comprising: lithium salts；Non-aqueous organic solvent；And additive.It is described
Additive includes: LiBF4 (LiBF4)；And one or more of compound with structure shown in formula I；
In formula I, R1、R2、R3Independently selected from aliphatic alkyl, phenyl and with 1-3 with 1-5 carbon atom
Alkylbenzene one of of the alkyl of carbon atom as substituent group.
In the nonaqueous electrolytic solution described according to a first aspect of the present invention, the compound with structure shown in formula I is added, it can be effective
Prevent nonaqueous electrolytic solution under high voltage in the oxygenolysis of surface of positive electrode active material, so as to improve the mistake in positive electrode active materials
The problem of metallic element occurs reduction reaction and then leads to dissolution is crossed, improves the stability of positive electrode active materials, and then effectively
Improve the high-temperature storage performance and cycle performance of lithium ion battery.This is because:-the CN that (1) is located at strand both ends can be with
Transition metal element forms bidentate chelation structure, and this bidentate chelation structure has than monodentate chelation structure preferably to be stablized
Property；(2) being located at-O- among strand also can occur complexing with transition metal element, to further enhance complexing knot
The stability of structure；(3) be located at strand among-O- have electron attraction, this electron attraction can make be located at two-
R between O-2On electron cloud to-O- deviate, and-CN have electron attraction more stronger than-O-, so as to make to be displaced to-
Electron cloud near O- is further deviated to-CN, the cloud density around final increase-CN, and further enhances-CN and mistake
The complexing of metallic element is crossed, that is, enhances the stability of chelation structure；(4) it is located at the small volume of-O- among strand,
It is smaller to the steric hindrance of the complexing of the-CN and transition metal element that are located at strand both ends, thus to a certain extent
The complexing of-CN and transition metal element is enhanced, i.e., if the biggish electron-withdrawing group of volume is arranged among strand
Substitution-O-, then it can generate biggish steric hindrance to the complexing for being located at strand both ends-CN and transition metal element
Effect, eventually leading to chelation structure becomes unstable.
In addition, if with structure shown in formula I compound strand it is too short, then positioned at strand both ends-CN between-
O- can complexing between p- CN and transition metal element generate biggish steric hindrance, to be unfavorable for being formed stable
Chelation structure；If the strand of the compound with structure shown in formula I is too long ,-the O- and transition metal being located among strand
The hypertelorism of element can weaken the complexing between-O- and transition metal element, and strand is too long, have I knot of formula
The fusing point of the compound of structure increases, and causes the viscosity of nonaqueous electrolytic solution to increase, is unfavorable for forming uniform nonaqueous electrolytic solution, in turn
Also it will affect the performance of lithium ion battery.
In the nonaqueous electrolytic solution described according to a first aspect of the present invention, suitable LiBF is added4, advantageously reduce anode
The impedance of the electrochemical reaction on surface, so as to improve the dynamic performance of lithium ion battery.
In the nonaqueous electrolytic solution described according to a first aspect of the present invention, while LiBF is added4With the change with Formulas I structure
Close object, on the one hand, the compound with Formulas I structure can generate complexing with transition metal element in positive electrode active materials and be formed
Stable bidentate chelation structure, so as to reduce the redox reaction between positive electrode active materials and nonaqueous electrolytic solution, drop
The dissolution of transition metal element in low positive electrode active materials, improves the stability of positive electrode active materials, and then effectively improves lithium
The high-temperature storage performance and cycle performance of ion battery；On the other hand, LiBF4Low ESR can be generated in surface of positive electrode active material
Film makes the high-temperature storage performance and cycle performance of lithium ion battery to significantly reduce the impedance of positive electrode surface electrochemical reaction
While obtaining improving, the high rate performance of lithium ion battery will not be deteriorated.
In the nonaqueous electrolytic solution described according to a first aspect of the present invention, the compound with structure shown in formula I be can be selected from
One or more of compound with 1 structure of formula, the compound with 2 structure of formula and compound with 3 structure of formula；
In the nonaqueous electrolytic solution described according to a first aspect of the present invention, the LiBF4Quality in nonaqueous electrolytic solution
Score can be 0.01%~0.5%.Work as LiBF4When mass fraction in nonaqueous electrolytic solution is lower than 0.01%, to anode
Improvement result is unobvious；Work as LiBF4When mass fraction in nonaqueous electrolytic solution is higher than 0.5%, excessive LiBF4It can be passivated again
Cathode makes the dynamic performance of lithium ion battery be deteriorated instead.
In the nonaqueous electrolytic solution described according to a first aspect of the present invention, the compound with Formulas I structure is non-aqueous
Mass fraction in electrolyte can be 0.1%~5%.When quality of the compound with Formulas I structure in nonaqueous electrolytic solution point
When number is lower than 0.1%, the chelation structure formed with the transition metal element in positive electrode active materials is not fine and close enough, can not be effective
Inhibit the redox reaction between nonaqueous electrolytic solution and positive electrode active materials, so that the height for being unable to improve lithium ion battery is gentle
Store up performance and cycle performance；When mass fraction of the compound with 1 structure of formula in nonaqueous electrolytic solution is higher than 5%, with
The complexing layer that transition metal element in positive electrode active materials is formed is blocked up, and the dynamic performance of lithium ion battery is caused obviously to become
Difference.
In the nonaqueous electrolytic solution described according to a first aspect of the present invention, the lithium salts can be selected from LiPF6、LiClO4、
LiAsF6、LiN(CF3SO2)2、LiCF3SO3And one or more of LiBOB.
In the nonaqueous electrolytic solution described according to a first aspect of the present invention, the non-aqueous organic solvent can be selected from ethylene carbonate
Ester (EC), propene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), γ-Ding Nei
In ester (BL), methyl formate (MF), Ethyl formate (MA), ethyl propionate (EP), propyl propionate (PP) and tetrahydrofuran (THF)
One or more.
Secondly the lithium ion battery of explanation according to a second aspect of the present invention.
Lithium ion battery according to a second aspect of the present invention, comprising: positive plate, including plus plate current-collecting body and it is set to anode
On collector and positive diaphragm containing a positive electrode active material；Negative electrode tab, including negative current collector and it is set to negative current collector
Cathode membrane upper and containing a negative electrode active material；Isolation film is interval between positive plate and negative electrode tab；Nonaqueous electrolytic solution；With
And package foil.Wherein, the nonaqueous electrolytic solution is the nonaqueous electrolytic solution according to first aspect present invention.
In the lithium ion battery described according to a second aspect of the present invention, the end of charge voltage of the lithium ion battery can
For 4.35V~5V.
In the lithium ion battery described according to a second aspect of the present invention, the positive electrode active materials can be selected from cobalt acid lithium,
The mixture of lithium-nickel-manganese-cobalt ternary material or both.
In the lithium ion battery described according to a second aspect of the present invention, the negative electrode active material can be selected from graphite, silicon
Or both mixture.
The comparative example and embodiment of nonaqueous electrolytic solution and lithium ion battery according to the present invention will be illustrated next.
Comparative example 1
(1) preparation of nonaqueous electrolytic solution
In drying shed, EC:PC:DEC=1:1:1 in mass ratio weighs non-aqueous organic solvent and mixes, and is added later
LiPF6As lithium salts and make LiPF6Concentration be 1mol/L, obtain nonaqueous electrolytic solution.
(2) preparation of positive plate
Weigh 1.42kg Solvents N-methyl -2-Pyrrolidone (NMP), the binder that 1.2kg mass fraction is 10% gathers partially
Difluoroethylene (PVDF), 0.16kg conductive agent electrically conductive graphite and 7.2kg positive electrode active materials LiCoO2It is sufficiently mixed and stirs
To anode sizing agent, anode sizing agent is uniformly coated on the plus plate current-collecting body aluminium foil with a thickness of 16 μm later, later at 120 DEG C
Baking 1h obtains positive diaphragm, obtains positive plate through overcompaction, cutting later.
(3) preparation of negative electrode tab
Weigh thickener sodium carboxymethylcellulose (CMC) solution that 1.2kg mass fraction is 1.5%, 0.07kg mass point
Count the binder SBR emulsion for 50%, 2.4kg negative electrode active material powdered graphite is sufficiently mixed and stirs to get cathode slurry
Negative electrode slurry, is uniformly coated on the negative current collector copper foil with a thickness of 12 μm later, obtains later in 120 DEG C of baking 1h by material
To cathode membrane, negative electrode tab is obtained through overcompaction, cutting later.
(4) preparation of lithium ion battery
Above-mentioned positive plate, negative electrode tab are separated with the polypropylene isolation film with a thickness of 12 μm and wind the naked electricity of squarely
Core is packed into aluminum foil sack later, and after 80 DEG C of bakings remove water, injection nonaqueous electrolytic solution, sealing, chemical conversion, exhaust simultaneously test appearance
Measure the lithium ion battery of finished product.
Comparative example 2
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.2% LiBF4。
Comparative example 3
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
1.5% compound with 1 structure of formula.
Comparative example 4
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.6% LiBF4The compound with 1 structure of formula for being 1.5% with the mass fraction in nonaqueous electrolytic solution.
Comparative example 5
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.2% LiBF4The compound with 1 structure of formula for being 6% with the mass fraction in nonaqueous electrolytic solution.
Comparative example 6
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.6% LiBF4The compound with 1 structure of formula for being 6% with the mass fraction in nonaqueous electrolytic solution.
Embodiment 1
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.2% LiBF4The compound with 1 structure of formula for being 0.2% with the mass fraction in nonaqueous electrolytic solution.
Embodiment 2
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.2% LiBF4The compound with 1 structure of formula for being 0.5% with the mass fraction in nonaqueous electrolytic solution.
Embodiment 3
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.2% LiBF4The compound with 1 structure of formula for being 1.5% with the mass fraction in nonaqueous electrolytic solution.
Embodiment 4
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.2% LiBF4The compound with 1 structure of formula for being 3% with the mass fraction in nonaqueous electrolytic solution.
Embodiment 5
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.2% LiBF4The compound with 1 structure of formula for being 5% with the mass fraction in nonaqueous electrolytic solution.
Embodiment 6
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.05% LiBF4The compound with 1 structure of formula for being 1.5% with the mass fraction in nonaqueous electrolytic solution.
Embodiment 7
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.1% LiBF4The compound with 1 structure of formula for being 1.5% with the mass fraction in nonaqueous electrolytic solution.
Embodiment 8
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.3% LiBF4The compound with 1 structure of formula for being 1.5% with the mass fraction in nonaqueous electrolytic solution.
Embodiment 9
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.5% LiBF4The compound with 1 structure of formula for being 1.5% with the mass fraction in nonaqueous electrolytic solution.
Embodiment 10
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.2% LiBF4The compound with 2 structure of formula for being 1.5% with the mass fraction in nonaqueous electrolytic solution.
Embodiment 11
Lithium ion battery is prepared according to the method for comparative example 1, removes following difference:
(1) also contain additive in nonaqueous electrolytic solution, the additive is that the mass fraction in nonaqueous electrolytic solution is
0.2% LiBF4The compound with 3 structure of formula for being 1.5% with the mass fraction in nonaqueous electrolytic solution.
Finally provide the performance test process and test result of comparative example 1-6 and embodiment 1-11.
(1) high-temperature storage performance of lithium ion battery is tested
At 25 DEG C, with 0.5C multiplying power constant-current charge to 4.4V, constant-voltage charge tests lithium to 0.05C at 4.4V later
The thickness of ion battery is simultaneously denoted as h0；Lithium ion battery is put into 70 DEG C of insulating box later, keeps the temperature 20 days, and was surveyed every 5 days
It tries the thickness of lithium ion battery and is denoted as hn, n is the number of days of high-temperature lithium ion battery storage.
Thickness swelling (%)=(h after high-temperature lithium ion battery storage n daysn-h0)/h0× 100%.
(2) the cycle performance test of lithium ion battery
At 25 DEG C, lithium ion battery is stood 30 minutes, later with 0.5C multiplying power constant-current charge to 4.4V, Zhi Hou
Constant-voltage charge is to 0.05C under 4.4V, and stands 5 minutes, and later with 0.5C multiplying power constant-current discharge to 3.0V, this is a charge and discharge
Cyclic process, this discharge capacity are the discharge capacity for the first time of lithium ion battery, carry out 200 charge and discharge cycles mistakes later
Journey.
Capacity retention ratio (%)=n-th circulation discharge capacity/discharge capacity for the first time after lithium ion battery n times circulation
× 100%.
(3) the high rate performance test of lithium ion battery
At 25 DEG C, lithium ion battery is stood 30 minutes, later with 0.5C multiplying power constant-current charge to 4.4V, Zhi Hou
Constant-voltage charge is to 0.05C under 4.4V, and stands 5 minutes, later by lithium ion battery respectively with different multiplying (0.2C, 0.5C,
1.0C, 1.5C, 2.0C) it is discharged to 3.0V, electric discharge terminates and then stands 5 minutes every time, and the electric discharge for recording lithium ion battery is held
Amount.On the basis of discharge capacity when 0.2C multiplying power discharging, discharge capacity of the lithium ion battery under different discharge-rates is obtained
Than.
Under discharge capacity ratio (%)=different multiplying (0.5C, 1.0C, 1.5C, 2.0C) under lithium ion battery different multiplying
Discharge capacity/0.2C multiplying power under discharge capacity × 100%.
Table 1 provides the parameter and the performance test results of comparative example 1-6 and embodiment 1-11.
Next the performance test results of lithium ion battery are analyzed.
LiBF is only added in the nonaqueous electrolytic solution of lithium ion battery from can be seen that in the comparison of comparative example 1-24Lithium
The high-temperature storage performance and high rate performance of ion battery are all significantly improved, but the cycle performance of lithium ion battery still compared with
Difference.There is Formulas I from can be seen that only to be added in the nonaqueous electrolytic solution of lithium ion battery in the comparison of comparative example 1 and comparative example 3
The high-temperature storage performance and cycle performance of the lithium ion battery of the compound of structure are all significantly improved, but lithium-ion electric
The high rate performance in pond is still poor.And as can be seen that in the non-of lithium ion battery from the comparison of embodiment 1-11 and comparative example 1-3
LiBF is added in water electrolysis liquid simultaneously4Have excellent height gentle simultaneously with the lithium ion battery of the compound with Formulas I structure
Store up performance, cycle performance and high rate performance.This is because: on the one hand, the compound with Formulas I structure can be with positive-active material
Transition metal element in material generates complexing and forms stable bidentate chelation structure, so as to reduce positive electrode active materials
Redox reaction between nonaqueous electrolytic solution reduces the dissolution of transition metal element in positive electrode active materials, improves anode
The stability of active material, and then effectively improve the high-temperature storage performance and cycle performance of lithium ion battery；On the other hand,
LiBF4Low ESR film can be generated in surface of positive electrode active material makes to significantly reduce the impedance of positive electrode surface electrochemical reaction
While the high-temperature storage performance and cycle performance of lithium ion battery obtain improving, the forthright again of lithium ion battery will not be deteriorated
Energy.
As can be seen that the quality in nonaqueous electrolytic solution point of the compound with Formulas I structure from the comparison of embodiment 1-5
Number is higher, sees on the whole, and the thickness swelling after high-temperature lithium ion battery storage is lower, after lithium ion battery repeatedly recycles
Capacity retention ratio slightly reduces after first increasing, and the discharge capacity under lithium ion battery different multiplying is still higher than comparison than reducing
Example 1.But mass fraction of the compound of Formulas I structure in nonaqueous electrolytic solution is excessively high (comparative example 5) when having, lithium ion battery
Cycle performance and high rate performance deteriorate.
As can be seen that LiBF from the comparison of embodiment 3 and embodiment 6-94Mass fraction is higher in nonaqueous electrolytic solution,
It sees on the whole, the thickness swelling after high-temperature lithium ion battery storage is lower, and the capacity after lithium ion battery repeatedly recycles is protected
Holdup slightly reduces after first increasing, and the discharge capacity ratio under lithium ion battery different multiplying slightly reduces after first increasing, but still high
In comparative example 1.But work as LiBF4Mass fraction in nonaqueous electrolytic solution is excessively high (comparative example 4), the cyclicity of lithium ion battery
Can obviously it deteriorate with high rate performance, and high-temperature storage performance of lithium ion battery also starts to be deteriorated.From the comparison of comparative example 5-6
It can be seen that similar phenomenon.
In conclusion LiBF is added simultaneously in nonaqueous electrolytic solution4It can make lithium-ion electric with the compound with Formulas I structure
Pond has excellent high-temperature storage performance, cycle performance and high rate performance simultaneously.
Claims (8)
1. a kind of nonaqueous electrolytic solution, comprising:
Lithium salts；
Non-aqueous organic solvent；And
Additive；
It is characterized in that,
The additive includes:
LiBF4；And
One or more of compound with structure shown in formula I；
In formula I, R1、R2、R3Independently selected from 1-5 carbon atom aliphatic alkyl, phenyl and with 1-3 carbon it is former
Alkylbenzene one of of the alkyl of son as substituent group；
Wherein, the LiBF4Mass fraction in nonaqueous electrolytic solution is 0.01%~0.05%, the change with Formulas I structure
Closing mass fraction of the object in nonaqueous electrolytic solution is 0.1%~5%.
2. nonaqueous electrolytic solution according to claim 1, which is characterized in that the compound with structure shown in formula I is selected from tool
There are one or more of the compound, the compound with 2 structure of formula and the compound with 3 structure of formula of 1 structure of formula；
3. nonaqueous electrolytic solution according to claim 1, which is characterized in that the lithium salts is selected from LiPF6、LiClO4、
LiAsF6、LiN(CF3SO2)2、LiCF3SO3And one or more of LiBOB.
4. nonaqueous electrolytic solution according to claim 1, which is characterized in that the non-aqueous organic solvent is selected from ethylene carbonate
Ester, propene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, gamma-butyrolacton, methyl formate, Ethyl formate, third
One or more of acetoacetic ester, propyl propionate and tetrahydrofuran.
5. a kind of lithium ion battery, comprising:
Positive plate, including plus plate current-collecting body and be set on plus plate current-collecting body and positive diaphragm containing a positive electrode active material；
Negative electrode tab, including negative current collector and be set on negative current collector and cathode membrane containing a negative electrode active material；
Isolation film is interval between positive plate and negative electrode tab；
Nonaqueous electrolytic solution；And
Package foil；
It is characterized in that,
The nonaqueous electrolytic solution is according to nonaqueous electrolytic solution of any of claims 1-4.
6. lithium ion battery according to claim 5, which is characterized in that the end of charge voltage of the lithium ion battery is
4.35V~5V.
7. lithium ion battery according to claim 5, which is characterized in that the positive electrode active materials are selected from cobalt acid lithium, lithium
The mixture of nickel manganese cobalt ternary material or both.
8. lithium ion battery according to claim 5, which is characterized in that the negative electrode active material be selected from graphite, silicon or
The mixture of the two.
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| CN101142705A (en) * | 2005-02-03 | 2008-03-12 | 三洋电机株式会社 | Nonaqueous electrolyte secondary battery |
| CN103518285A (en) * | 2012-05-08 | 2014-01-15 | 株式会社Lg化学 | Non-aqueous electrolyte for lithium secondary battery and lithium secondary battery containing same |
| CN104022310A (en) * | 2014-06-18 | 2014-09-03 | 厦门首能科技有限公司 | Lithium ion secondary battery electrolyte and lithium ion battery containing electrolyte |
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