CN103151559A - Non-aqueous electrolyte solution for lithium ion battery and corresponding lithium ion battery - Google Patents
Non-aqueous electrolyte solution for lithium ion battery and corresponding lithium ion battery Download PDFInfo
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- CN103151559A CN103151559A CN2013100461056A CN201310046105A CN103151559A CN 103151559 A CN103151559 A CN 103151559A CN 2013100461056 A CN2013100461056 A CN 2013100461056A CN 201310046105 A CN201310046105 A CN 201310046105A CN 103151559 A CN103151559 A CN 103151559A
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- lithium ion
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention aims to provide a high performance non-aqueous electrolyte solution used for a lithium ion battery. The non-aqueous electrolyte solution includes: a lithium salt; an organic solvent; and an unsaturated phosphate compound. The unsaturated phosphate compound is in favor of forming a stable and compact passivation film (SEI (solid electrolyte interface)) on an electrode surface so as to prevent further decomposition of solvent molecules. The electrolyte solution obtained according to the scheme involved in the invention can improve the high-temperature storage performance and cycle performance of the battery.
Description
Technical field
The present invention relates to electrochemical field, relate in particular to field of lithium ion secondary.
Background technology
Portable type electronic product such as camera, Digital Video, mobile phone, notebook computer etc. are widely used in daily life.Along with development and the market demand of science and technology, to having higher requirement in volume, weight, function and the useful life of portable type electronic product.Therefore, the power supply product that exploitation matches with portable type electronic product, the secondary cell of especially developing high-energy-density, long-life and high security is the active demand of industry development.
Compare with lead-acid battery, nickel-cadmium cell, Ni-MH battery, the characteristics such as lithium ion battery is large because of its energy density, operating voltage is high, the life-span is long, environmental protection are widely used in portable type electronic product.
Lithium ion battery mainly is comprised of positive and negative electrode, electrolyte and barrier film.Positive pole is mainly the transition metal oxide that contains lithium, and negative pole is mainly Carbon Materials.Because the average discharge volt of lithium ion battery is about 3.6-3.7V, need to be in the charging/discharging voltages of 0-4.2V stable electrolyte component.For this reason, lithium ion battery uses and is dissolved with the organic solvent mixed liquor of lithium salts as electrolyte.Preferred organic solvent should have high ionic conductivity, high dielectric constant and low viscosity.Yet single organic solvent is difficult to satisfy simultaneously these requirements, so, generally with the organic solvent of high-k and the low viscous organic solvent mixed liquor solvent as lithium-ion battery electrolytes.For example: lithium ion battery uses the mixture that comprises cyclic carbonate ester solvent (as ethylene carbonate) and linear carbonates solvent (as dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate) as solvent usually, and lithium hexafluoro phosphate is as the electrolyte of solute.
Lithium ion battery is in the initial charge process, and lithium ion takes off embedding out from the lithium metal oxide of cathode active material, and the migration of anode carbon electrode, then be embedded in material with carbon element under the driving of voltage.In this process, electrolyte and carbon anode surface react, and produce Li
2CO
3, Li
2O, the materials such as LiOH, thus at carbon anode surface formation one deck passivating film, this passivating film is referred to as solid electrolyte interface (SEI) film.Due to no matter be the charging or the discharge, lithium ion must pass through this layer SEI film, so the performance of SEI film has determined many performances (as cycle performance, high-temperature behavior, high rate performance) of battery.The SEI film can stop the further decomposition of electrolyte solvent after initial charge forms, and forms ion channel in charge and discharge cycles subsequently.Yet along with the carrying out that discharges and recharges, the expansion that electrode repeats and contraction SEI film may break or dissolving gradually, the anode that thereupon exposes continues to react with electrolyte, produce simultaneously gas, thereby increase the interior pressure of battery, and significantly reduce the cycle life of battery.Especially battery stores under hot conditions and carry out charge and discharge cycles under hot conditions, and the SEI film is easier to be destroyed, thereby causes battery bulging and cycle performance obviously to descend.The kind of the carbonic ester that uses according to electrolyte and the type of anode active material, the gas of generation mainly comprises CO, CO
2, CH
4, C
2H
6Deng.
Because the quality of SEI film is most important to high-temperature storage performance and the cycle performance of lithium ion battery, therefore improve the quality of SEI film to realizing that high performance lithium ion battery is very necessary by regulation and control.In order to address this problem, people attempt adding a small amount of additive and improve the SEI film in electrolyte, to improving the performance of lithium ion battery.Researcher has been developed a series of film for additive such as vinylene carbonate (VC), vinyl ethylene carbonate (VEC), fluorinated ethylene carbonate (FEC) etc. through great efforts, they can form more stable SEI on the graphite cathode surface, thereby have significantly improved the cycle performance of lithium ion battery.Japanese Matsushita Electric Industrial Industry Co., Ltd discloses a kind of (R that contains in the patent of Chinese application number 00801010.2
1a) P=(O) (OR
2a) (OR
3a) (wherein, R
1a, R
2a, R
3aRepresent that independently carbon number is the aliphatic alkyl of 7-12) electrolyte of compound, it has controlled effectively that the discharge capacity that occurs along with the carrying out of charge and discharge cycles descends and the phenomenon of battery behavior decline during High temperature storage.Korea S Samsung SDI Co., Ltd discloses a kind of (R that contains in Chinese application number 200410001479.7 patents
1O) P=(OR
2) (CH=C (R
3) (R
4)) electrolyte of compound, the reliability that it effectively prevents the battery bulging and has improved battery.
Yet the battery in above-mentioned patent is still not ideal enough on high-temperature storage performance and cycle performance, still the decomposition of electrolyte can occur and cause inflatable at higher temperature, thereby bring serious potential safety hazard, therefore be necessary to develop the high-temperature storage performance that new additive further improves lithium ion battery.
Summary of the invention
The invention provides a kind of can suppress battery high-temperature store bulging and improve cycle performance nonaqueous electrolytic solution.The present invention also provides a kind of lithium ion battery that uses this nonaqueous electrolytic solution.
The invention provides a kind of lithium ion battery nonaqueous electrolytic solution, comprising:
Lithium salts;
Organic solvent; And
Unsaturated phosphate compound, this phosphate compound is as shown in structural formula 1:
R wherein
1, R
2, R
3Independently be selected from respectively the alkyl that carbon number is 1-4, and R
1, R
2, R
3In at least one is unsaturated alkyl.
Preferably, described phosphate compound structure is as shown in structural formula 2:
R wherein
4Be selected from saturated hydrocarbyl or unsaturated alkyl that carbon number is 1-4.
Preferably, described phosphate compound structure is as shown in structural formula 3:
R wherein
5Be selected from saturated hydrocarbyl or unsaturated alkyl that carbon number is 1-4.
More preferably, described phosphate compound is selected from one of following material or its mixture: tricresyl phosphate vinyl acetate, TAP.
Another with the exemplary compound in the described compound of structure 1 shown in table 1, but be not restricted to this.
Table 1
According to lithium ion battery nonaqueous electrolytic solution of the present invention, contain phosphate compound.This phosphate compound helps to have stoped the further decomposition of solvent molecule at the stable fine and close passivating film (SEI film) of battery electrode surface formation.Can improve high-temperature storage performance and the cycle performance of battery according to the electrolyte of the solution of the present invention.
According to lithium ion battery nonaqueous electrolytic solution provided by the present invention, be preferably 0.01%-2% by the content of the described phosphate compound of structural formula 1 in electrolyte by the electrolyte total weight.It is easier in the effective SEI film of battery electrode surface formation when the content when phosphate compound in electrolyte is not less than 0.01%.More preferably, when phosphate compound can further improve the stability of SEI film when the content of electrolyte is not less than 0.1%, thereby further improve high-temperature storage performance and the cycle performance of battery.On the other hand, the content when phosphate compound in electrolyte can suppress the increase of the internal resistance of cell not higher than 2% the time.More preferably, the content of phosphate compound in electrolyte can further not improve high-temperature storage and the cycle performance of battery higher than 1% the time.
According to lithium ion battery nonaqueous electrolytic solution provided by the invention, can be further add the cycle performance that one or more additives in vinylene carbonate (VC), fluorinated ethylene carbonate (FEC), vinyl ethylene carbonate (VEC) improve battery in the electrolyte.
Lithium ion battery of the present invention comprises cyclic carbonate and linear carbonate with the solvent of nonaqueous electrolytic solution, cyclic carbonate wherein comprises one or more in ethylene carbonate (EC), propene carbonate (PC), butylene (BC), and linear carbonate wherein comprises one or more in dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), methyl propyl carbonate (MPC).
Lithium ion battery of the present invention comprises LiPF with the solute of nonaqueous electrolytic solution
6, LiBF
4, LiSbF
6, LiAsF
6, LiN (SO
2CF
3)
2, LiN (SO
2C
2F
5)
2, LiC (SO
2CF
3)
3, LiN (SO
2F)
2In at least a.LiPF preferably wherein
6Or the mixture of itself and other lithium salts.
Lithium ion battery of the present invention is applied to have in the lithium ion battery of negative pole and positive pole with nonaqueous electrolytic solution, and described negative pole is made by material with carbon element, metal alloy, otide containing lighium thing and material etc.Wherein, the preferred graphite of material with carbon element or be coated on graphite surface with graphite-phase than amorphous carbon and material with carbon element.Described positive electrode preferably adopts lithium-containing transition metal oxide, for example is selected from one or more in following material: LiCoO
2, LiNiO
2, LiMn
2O
4, LiCo
1-yM
yO
2, LiNi
1-yM
yO
2, LiMn
2-yM
yO
4, LiNi
xCo
yMn
zM
1-x-y-zO
2, wherein M is selected from one or more in Fe, Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V, Ti, and 0≤y≤1,0≤x≤1,0≤z≤1, x+y+z≤1.
The present invention also provides a kind of lithium ion battery, comprising: lithium ion battery nonaqueous electrolytic solution provided by the invention in foregoing; Can embed the positive pole with removal lithium embedded; Can embed the negative pole with removal lithium embedded; And be placed in barrier film between positive pole and negative pole.
The present invention also provides above-described phosphate compound improving the application of lithium ion battery with the aspect of performance of nonaqueous electrolytic solution and lithium ion battery in addition.
Embodiment
By describing technology contents of the present invention, structural feature in detail, being realized purpose and effect, described in detail below in conjunction with execution mode.
Embodiment 1
1) preparation of electrolyte
Ethylene carbonate (EC), diethyl carbonate (DEC) and methyl ethyl carbonate (EMC) in mass ratio for EC:DEC:EMC=1:1:1 mixes, are then added lithium hexafluoro phosphate (LiPF
6) to molar concentration be 1mol/L, add again the compound 1, the compound 2 that refer in the compound 1(embodiment by the gross mass 0.5% of electrolyte ... refer to the compound of the reference numeral enumerated in table 1, below each example in like manner) shown in phosphate compound.
2) preparation of positive plate
The quality of pressing 93:4:3 is than blended anode active material lithium nickel cobalt manganese oxide LiNi
0.5Co
0.2Mn
0.3O
2, conductive carbon black Super-P and binding agent polyvinylidene fluoride (PVDF) then are dispersed in them in METHYLPYRROLIDONE (NMP), obtain anode sizing agent.Slurry is uniformly coated on the two sides of aluminium foil, through oven dry, calendering and vacuumize, and burn-ons with supersonic welder and obtain positive plate after the aluminum lead-out wire, the thickness of pole plate is at 120-150 μ m.
3) preparation of negative plate
Press the mass ratio mixing negative active core-shell material modified natural graphite of 94:1:2.5:2.5, conductive carbon black Super-P, binding agent butadiene-styrene rubber (SBR) and carboxymethyl cellulose (CMC) then are dispersed in them in deionized water, obtain cathode size.Slurry is coated on the two sides of Copper Foil, through oven dry, calendering and vacuumize, and burn-ons with supersonic welder and obtain negative plate after nickel making outlet, the thickness of pole plate is at 120-150 μ m.
4) preparation of battery core
Place thickness and be the polyethene microporous membrane of 20 μ m between positive plate and negative plate as barrier film, then the sandwich structure that positive plate, negative plate and barrier film is formed is reeled, put into square aluminum metal-back after again coiling body being flattened, the lead-out wire of both positive and negative polarity is welded on respectively on the relevant position of cover plate, and with laser-beam welding machine, cover plate and metal-back are welded as a whole, obtain treating the battery core of fluid injection.
5) fluid injection of battery core and changing into
Be controlled at dew point in the glove box below-40 ℃, the electrolyte of above-mentioned preparation is injected battery core by liquid injection hole, the amount of electrolyte will guarantee to be full of the space in battery core.Then change into according to the following steps: 0.05C constant current charge 3min, 0.2C constant current charge 5min, 0.5C constant current charge 25min, after shelving 1hr, shaping is sealed, then further with the electric current constant current charge of 0.2C to 4.2V, after normal temperature shelf 24hr, with the electric current constant-current discharge of 0.2C to 3.0V.
6) normal-temperature circulating performance test
At room temperature with the electric current constant current charge of 1C to 4.2V then constant voltage charge to electric current drop to 0.1C, then with the electric current constant-current discharge of 1C to 3.0V, so 300 weeks of circulation, discharge capacity and the discharge capacity in the 300th week in the 1st week of record are calculated as follows the capability retention that normal temperature circulates:
The discharge capacity * 100% in the discharge capacity in capability retention=the 300th week/the 1st week
7) high temperature cyclic performance test
Battery is placed in the baking oven of 45 ℃ of constant temperature, with the electric current constant current charge of 1C to 4.2V then constant voltage charge to electric current drop to 0.1C, then with the electric current constant-current discharge of 1C to 3.0V, so circulated for 300 weeks, record discharge capacity and the discharge capacity in the 300th week in the 1st week, be calculated as follows the capability retention of high temperature circulation:
The discharge capacity * 100% in the discharge capacity in capability retention=the 300th week/the 1st week
8) high-temperature storage performance test
At room temperature with the electric current constant current charge of 1C to 4.2V then constant voltage charge to electric current drop to 0.1C, measure the thickness of battery, the baking oven that then battery is placed in 85 ℃ of constant temperature stores 4h, takes out relief battery cool to room temperature, measure the thickness of battery, be calculated as follows the thickness swelling of battery:
Cell thickness * 100% before thickness swelling=(cell thickness before the cell thickness after storage-storage)/storage
Embodiment 2
In the preparation of electrolyte, 0.5% compound 1 is changed into 0.5% compound 2, other is identical with embodiment 1, and the data of normal temperature circulation, high temperature circulation and high-temperature storage that test obtains see Table 2.
Embodiment 3
In the preparation of electrolyte, 0.5% compound 1 is changed into 0.5% compound 5, other is identical with embodiment 1, and the data of normal temperature circulation, high temperature circulation and high-temperature storage that test obtains see Table 2.
Embodiment 4
In the preparation of electrolyte, 0.5% compound 1 is changed into 0.5% compound 7, other is identical with embodiment 1, and the data of normal temperature circulation, high temperature circulation and high-temperature storage that test obtains see Table 2.
Comparative example 1
Do not add in the preparation of electrolyte compound 1, other is identical with embodiment 1, and the data of normal temperature circulation, high temperature circulation and high-temperature storage that test obtains see Table 2.
Table 2
Data by table 2 can be found out, compare with the electrolyte that does not contain additive, and normal-temperature circulating performance, high temperature cyclic performance and the high-temperature storage performance of having added the prepared battery of electrolyte of phosphate compound all are significantly improved.
Embodiment 5
In the preparation of electrolyte, 0.5% compound 1 is changed into 0.01% compound 1, other is identical with embodiment 1, and the data of normal temperature circulation, high temperature circulation and high-temperature storage that test obtains see Table 3.
Embodiment 6
In the preparation of electrolyte, 0.5% compound 1 is changed into 0.1% compound 1, other is identical with embodiment 1, and the data of normal temperature circulation, high temperature circulation and high-temperature storage that test obtains see Table 3.
Embodiment 7
In the preparation of electrolyte, 0.5% compound 1 is changed into 1% compound 1, other is identical with embodiment 1, and the data of normal temperature circulation, high temperature circulation and high-temperature storage that test obtains see Table 3.
Embodiment 8
In the preparation of electrolyte, 0.5% compound 1 is changed into 2% compound 1, other is identical with embodiment 1, and the data of normal temperature circulation, high temperature circulation and high-temperature storage that test obtains see Table 3.
Table 3
Can find out from the data of table 3, when the addition of compound 1 in electrolyte brings up to 0.1% from 0.01%, the normal-temperature circulating performance of battery, high temperature circulation and high-temperature storage performance improve gradually, but when addition surpasses 1%, normal-temperature circulating performance and the high temperature cyclic performance of battery descend to some extent, but still obviously are better than not adding the battery of compound 1.
Embodiment 9
In the preparation of electrolyte, 0.5% compound 1 is changed into the combination of 1% vinylene carbonate (VC) and 0.5% compound 1, other is identical with embodiment 1, and the data of testing the normal temperature circulation, high temperature circulation and the high-temperature storage that obtain see Table 4.
Embodiment 10
In the preparation of electrolyte, 0.5% compound 1 is changed into the combination of 1% fluorinated ethylene carbonate (FEC) and 0.5% compound 1, other is identical with embodiment 1, and the data of testing the normal temperature circulation, high temperature circulation and the high-temperature storage that obtain see Table 4.
Embodiment 11
In the preparation of electrolyte, 0.5% compound 1 is changed into the combination of 1% vinyl ethylene carbonate (VEC) and 0.5% compound 1, other is identical with embodiment 1, and the data of testing the normal temperature circulation, high temperature circulation and the high-temperature storage that obtain see Table 4.
Comparative example 2
In the preparation of electrolyte, 0.5% compound 1 is changed into 1% vinylene carbonate (VC), other is identical with embodiment 1, and the data of normal temperature circulation, high temperature circulation and high-temperature storage that test obtains see Table 4.
Comparative example 3
In the preparation of electrolyte, 0.5% compound 1 is changed into 1% fluorinated ethylene carbonate (FEC), other is identical with embodiment 1, and the data of normal temperature circulation, high temperature circulation and high-temperature storage that test obtains see Table 4.
Comparative example 4
In the preparation of electrolyte, 0.5% compound 1 is changed into 1% vinyl ethylene carbonate (VEC), other is identical with embodiment 1, and the data of normal temperature circulation, high temperature circulation and high-temperature storage that test obtains see Table 4.
Table 4
Can find out from the data of table 4, on the basis of using VC, FEC or VEC, further add compound 1 and can make battery obtain better high-temperature storage performance, normal-temperature circulating performance and high temperature cyclic performance also are improved simultaneously.
Embodiment 12
Except with positive electrode LiNi
0.5Co
0.2Mn
0.3O
2Change LiNi into
1/3Co
1/3Mn
1/3O
2And in the preparation of electrolyte, 0.5% compound 1 is changed into outside the combination of 1% vinylene carbonate (VC) and 0.5% compound 1, other is identical with embodiment 1, and the data of testing the normal temperature circulation, high temperature circulation and the high-temperature storage that obtain see Table 5.
Embodiment 13
Except with positive electrode LiNi
0.5Co
0.2Mn
0.3O
2Change LiNi into
0.8Co
0.15Al
0.05O
2And in the preparation of electrolyte, 0.5% compound 1 is changed into outside the combination of 1% vinylene carbonate (VC) and 0.5% compound 1, other is identical with embodiment 1, and the data of testing the normal temperature circulation, high temperature circulation and the high-temperature storage that obtain see Table 5.
Embodiment 14
Except with positive electrode LiNi
0.5Co
0.2Mn
0.3O
2Change LiCoO into
2And in the preparation of electrolyte, 0.5% compound 1 is changed into outside the combination of 1% vinylene carbonate (VC) and 0.5% compound 1, other is identical with embodiment 1, and the data of testing the normal temperature circulation, high temperature circulation and the high-temperature storage that obtain see Table 5.
Embodiment 15
Except with positive electrode LiNi
0.5Co
0.2Mn
0.3O
2Change LiMn into
2O
4And in the preparation of electrolyte, 0.5% compound 1 is changed into outside the combination of 1% vinylene carbonate (VC) and 0.5% compound 1, other is identical with embodiment 1, and the data of testing the normal temperature circulation, high temperature circulation and the high-temperature storage that obtain see Table 5.
Comparative example 5
Except with positive electrode LiNi
0.5Co
0.2Mn
0.3O
2Change LiNi into
1/3Co
1/3Mn
1/3O
2And in the preparation of electrolyte, 0.5% compound 1 is changed into outside 1% vinylene carbonate (VC), other is identical with embodiment 1, and the data of testing the normal temperature circulation, high temperature circulation and the high-temperature storage that obtain see Table 5.
Comparative example 6
Except with positive electrode LiNi
0.5Co
0.2Mn
0.3O
2Change LiNi into
0.8Co
0.15Al
0.05O
2And in the preparation of electrolyte, 0.5% compound 1 is changed into outside 1% vinylene carbonate (VC), other is identical with embodiment 1, and the data of testing the normal temperature circulation, high temperature circulation and the high-temperature storage that obtain see Table 5.
Comparative example 7
Except with positive electrode LiNi
0.5Co
0.2Mn
0.3O
2Change LiCoO into
2And in the preparation of electrolyte, 0.5% compound 1 is changed into outside 1% vinylene carbonate (VC), other is identical with embodiment 1, and the data of testing the normal temperature circulation, high temperature circulation and the high-temperature storage that obtain see Table 5.
Comparative example 8
Except with positive electrode LiNi
0.5Co
0.2Mn
0.3O
2Change LiMn into
2O
4And in the preparation of electrolyte, 0.5% compound 1 is changed into outside 1% vinylene carbonate (VC), other is identical with embodiment 1, and the data of testing the normal temperature circulation, high temperature circulation and the high-temperature storage that obtain see Table 5.
Table 5
Can find out from the data of table 5, with LiNi
1/3Co
1/3Mn
1/3O
2, LiNi
0.8Co
0.15Al
0.05O
2, LiCoO
2, LiMn
2O
4In lithium ion battery for positive electrode, add the high-temperature storage performance that compound 1 also can improve battery, also can improve normal-temperature circulating performance and the high temperature cyclic performance of battery simultaneously.
The above is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or equivalent flow process conversion that utilizes description of the present invention to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.
Claims (11)
1. lithium ion battery nonaqueous electrolytic solution comprises:
Lithium salts;
Organic solvent; And
Phosphate compound, this compound is as shown in structural formula 1:
R wherein
1, R
2, R
3Independently be selected from respectively the alkyl that carbon number is 1-4, and R
1, R
2, R
3In at least one is unsaturated alkyl.
2. lithium ion battery nonaqueous electrolytic solution according to claim 1, is characterized in that, described phosphate compound is as shown in structural formula 2:
R wherein
4Be selected from saturated hydrocarbyl or unsaturated alkyl that carbon number is 1-4.
3. lithium ion battery nonaqueous electrolytic solution according to claim 1, is characterized in that, described phosphate compound is as shown in structural formula 3:
R wherein
5Be selected from saturated hydrocarbyl or unsaturated alkyl that carbon number is 1-4.
4. lithium ion battery nonaqueous electrolytic solution according to claim 1, is characterized in that, described phosphate compound is selected from one of following material or its mixture: tricresyl phosphate vinyl acetate, TAP.
5. the described lithium ion battery nonaqueous electrolytic solution of according to claim 1 to 4 any one, is characterized in that, the content of described phosphate compound is counted 0.01%-2% by the total weight of electrolyte.
6. the described lithium ion battery nonaqueous electrolytic solution of according to claim 1 to 5 any one, it is characterized in that, described lithium ion battery also contains one or more in following material with nonaqueous electrolytic solution: vinylene carbonate, fluorinated ethylene carbonate, vinyl ethylene carbonate.
7. the described lithium ion battery nonaqueous electrolytic solution of according to claim 1 to 6 any one, is characterized in that, described organic solvent is the mixture of cyclic carbonate and linear carbonate.
8. lithium ion battery nonaqueous electrolytic solution according to claim 7, is characterized in that, described cyclic carbonate comprises: one or more in ethylene carbonate, propene carbonate, butylene.
9. lithium ion battery nonaqueous electrolytic solution according to claim 7, is characterized in that, described linear carbonate comprises: one or more in dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, methyl propyl carbonate.
10. according to claim 1 ~ 9 described lithium ion battery nonaqueous electrolytic solutions of any one, is characterized in that, described lithium salts is selected from: LiPF
6, LiBF
4, LiSbF
6, LiAsF
6, LiN (SO
2CF
3)
2, LiN (SO
2C
2F
5)
2, LiC (SO
2CF
3)
3, LiN (SO
2F)
2In at least a.
11. a lithium ion battery comprises:
The described lithium ion battery nonaqueous electrolytic solution of claim 1 ~ 10 any one;
Can embed the positive pole with removal lithium embedded;
Can embed the negative pole with removal lithium embedded; And
Be placed in the barrier film between positive pole and negative pole.
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