CN102738511A - Lithium ion battery and electrolyte thereof - Google Patents
Lithium ion battery and electrolyte thereof Download PDFInfo
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- CN102738511A CN102738511A CN201210005068XA CN201210005068A CN102738511A CN 102738511 A CN102738511 A CN 102738511A CN 201210005068X A CN201210005068X A CN 201210005068XA CN 201210005068 A CN201210005068 A CN 201210005068A CN 102738511 A CN102738511 A CN 102738511A
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- Y02E60/10—Energy storage using batteries
Abstract
The invention, belonging to the technical field of lithium ion battery, particularly relates to a lithium ion battery electrolyte capable of improving the high temperature storage performance of a lithium ion battery, comprising a non-aqueous solvent, lithium salts dissolved in the non-aqueous solvent, and an additive which is a compound of formula (I), wherein R1, R2, and R3 are selected from hydrogen atom, alkyl containing 1-12 carbon atoms, cycloalkyl containing 3-8 carbon atoms, and aryl containing 6-12 carbon atoms, and n is an integer in the range of 0-7. The compound can effectively passivate the anode and cathode surfaces, prevent oxygenolysis of the electrolyte ingredients on the anode surface and prevent reductive decomposition on the cathode surface, thus gas generation of the battery is reduced, and the high temperature storage performance of the lithium ion battery is raised. In addition, the invention further discloses a lithium ion battery containing the electrolyte.
Description
Technical field
The invention belongs to technical field of lithium ion, relate in particular to a kind of secondary cell that can improve the lithium-ion battery electrolytes of lithium ion battery high-temperature storage performance and use this electrolyte.
Background technology
Lithium ion battery have energy density height, operating voltage high, have extended cycle life, memory-less effect, advantage such as environmentally friendly; Become the main power supply that moves consumer electronics, lithium ion battery also reaches its maturity in the application technology of aspects such as electric automobile, intelligent grid at present.
Along with the continuous development of lithium power technology, people hope that lithium ion battery can have higher energy density.In order to improve the energy density of lithium ion battery, mainly contain two kinds of trend at present: the one, the positive electrode that some nickel element content are high is used for lithium ion battery like the lithium nickel cobalt manganese oxidation thing of lithium nickel cobalt aluminum oxide, high nickel content by exploitation; The 2nd, the charging cut-ff voltage of raising lithium ion battery makes positive pole deviate from more a high proportion of lithium ion, thereby obtains higher capacity, reaches the demand that improves energy density.
But under fully charged state, the negative pole of lithium ion battery has high reproducibility, and is just having high oxidation property.In actual use, factor such as the lasting use heating of electronic product and the rising of battery environment for use temperature all possibly make battery be under the condition of high temperature.At high temperature, the positive pole of battery, the reactivity of negative pole further strengthen, and cause lithium-ion battery electrolytes and negative pole, positive pole to react, and produce gas, cause cell expansion.Special, the positive electrode of high nickel content under identical charging cut-ff voltage, or identical positive electrode be charged to higher cut-ff voltage and all can improve anodal oxidability, the problem of oxidation of electrolyte is even more serious, the phenomenon of cell expansion is more obvious.This not only causes the damage of battery itself; Also can cause simultaneously using the damage of the equipment of battery; Because cell expansion distortion causes inside battery to be short-circuited or the power brick pack is burst and caused flammable electrolyte to be revealed, the risk that causes security incidents such as fire is arranged in the time of serious.Therefore the battery flatulence problem that the decomposition that needs effective method to solve electrolyte causes.
Can reflect thus, necessaryly provide a kind of electrolyte that can under the condition of high temperature, suppress to react, thereby improve the electrolyte of lithium ion battery high-temperature storage performance and comprise the lithium ion battery of this electrolyte with anodal, negative pole.
Summary of the invention
One of the object of the invention is: to the deficiency of prior art, and provide a kind of electrolyte that can under the condition of high temperature, suppress to react with anodal, negative pole, thereby improve the electrolyte of lithium ion battery high-temperature storage performance.
In order to reach above-mentioned technical purpose, the present invention adopts following technical scheme:
A kind of lithium-ion battery electrolytes comprises nonaqueous solvents and is dissolved in the lithium salts in the nonaqueous solvents that described electrolyte also comprises additive, and said additive is the compound by formula (I) expression:
Formula I
R wherein
1, R
2, R
3Be selected from hydrogen atom, contain 1～12 carbon atom alkyl, contain the cycloalkyl of 3～8 carbon atoms and contain the aromatic radical of 6～12 carbon atoms, n is 0～7 integer.
The compound of general formula (I) expression contains itrile group and ethylene linkage in the molecular structure, itrile group can form stronger complexing with transition metal atoms, and ethylene linkage also has certain complexing to transition metal atoms; Simultaneously two keys also possibly be reduced in negative terminal surface, and are oxidized on anodal surface, thereby the electrochemical polymerization effect takes place, and generate the polymer inactivation film, and the itrile group in the molecular formula makes ethylene linkage receive activation, and filming function further strengthens.Therefore this compound anodal, negative terminal surface of passivation effectively suppresses electrolyte component in the oxidation Decomposition on anodal surface, in the reduction decomposition of negative terminal surface, thereby reduces the aerogenesis of battery, improves the high-temperature storage performance of lithium ion battery.
For this compound, R in the general formula (I)
1, R
2, R
3Be selected from hydrogen atom independently of one another, contain 1～12 carbon atom alkyl, contain the cycloalkyl of 3～8 carbon atoms and contain the aromatic radical of 6～12 carbon atoms.If the carbon number of these groups is too much, then cause additive viscosity to increase easily, electrolytic conductivity reduces, thereby battery performance is worsened; Because of the space steric effect of each functional group, the synergy of two keys and itrile group and surface reaction activity reduce simultaneously, cause its effect of improving to the high temperature storage of battery to reduce.
As a kind of improvement of lithium-ion battery electrolytes of the present invention, the quality of said additive accounts for the 0.1wt% of electrolyte gross mass to 15wt%.Content of additive is that the 0.1wt%～15wt% of electrolyte gross weight is comparatively suitable.If too low its passivation to both positive and negative polarity of Ruo Taigaozeyin causes internal battery impedance to increase then to the DeGrain that improves of high temperature storage, battery capacity reduces.The quality of additive accounts for the 0.1wt%～15wt% of electrolyte gross mass, can make battery obtain excellent high, has higher capacity performance simultaneously.
As a kind of improvement of lithium-ion battery electrolytes of the present invention, the quality of said additive accounts for the 1wt% of electrolyte gross mass to 10wt%.
As a kind of improvement of lithium-ion battery electrolytes of the present invention, the quality of said additive accounts for the 2wt% of electrolyte gross mass to 5wt%.
As a kind of improvement of lithium-ion battery electrolytes of the present invention, n is 1～7 integer in the described additive.For this compound, when itrile group directly links to each other with ethylene linkage, promptly the n among the formula I is 0 o'clock; Itrile group and ethylene linkage can form stronger conjugated structure, and additive more is prone to electrochemical polymerization on the positive and negative electrode surface, cause interfacial film thicker; Interface impedance is bigger, thereby causes the greater loss of anode specific capacity; Carbon number between itrile group and ethylene linkage, promptly the n among the formula I is not 0 o'clock, the introducing of this compound not only improves significantly to high temperature storage, and also smaller to the infringement of anode specific capacity.Therefore comprehensive battery capacity performance and high-temperature storage performance, preferred compound are not conjugation of ethylene linkage and itrile group, and promptly formula n is not that the represented compound of 0 up-to-date style I is the most suitable; Consider that n increases, promptly molecule carbon chain length increases, and causes electrolyte viscosity to increase, and conductivity reduces, so the value of n is comparatively suitable with 1～7.
As a kind of improvement of lithium-ion battery electrolytes of the present invention, described additive is the 3-butene nitrile.
A kind of improvement as lithium-ion battery electrolytes of the present invention; Described solvent is ethylene carbonate, propene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methyl ethyl carbonate, carbonic acid first propyl ester, vinylene carbonate, fluorinated ethylene carbonate, methyl formate, ethyl acetate, methyl butyrate, methyl acrylate, ethene sulfite, propylene sulfite, dimethyl sulfite, diethyl sulfite, acid anhydrides, N-methyl pyrrolidone, N-NMF, N-methylacetamide, acetonitrile, N, at least a in dinethylformamide, sulfolane, methyl-sulfoxide, methyl sulfide, gamma-butyrolacton and the oxolane.
Another object of the present invention is to provide a kind of lithium ion battery; Comprise plus plate current-collecting body and be coated in positive active material, the negative current collector on the plus plate current-collecting body and be coated in negative electrode active material, barrier film and the electrolyte on the negative current collector that said electrolyte is the described lithium-ion battery electrolytes of above-mentioned paragraph.
Relative prior art; Owing to added the additive that contains thiazolinyl and itrile group in the electrolyte that lithium ion battery of the present invention uses; Battery has better stability under the state that completely fills, because electrolyte wherein is difficult for being decomposed by the positive pole of state-of-charge and negative pole, thus the generation of minimizing gas; Therefore lithium ion battery of the present invention has the little advantage of cell thickness expansion when high temperature storage, has more performance.
As a kind of improvement of lithium ion battery of the present invention, described positive active material comprises at least a in lithium and cobalt oxides, lithium nickel oxide, lithium manganese oxide, Li, Ni, Mn oxide, lithium nickel cobalt manganese oxidation thing and the lithium nickel cobalt aluminum oxide.
Improve described negative electrode active material as lithium ion battery of the present invention a kind of and comprise at least a in soft carbon, hard carbon, Delanium, native graphite, silicon, silicon oxide compound, silicon-carbon compound or the lithium titanate.
Electrolyte of the present invention can both play the effect that improves high-temperature storage performance for the battery that these positive active materials and negative electrode active material are assembled into.
Embodiment
Comparative Examples 1
The preparation of electrolyte:
Ethylene carbonate (EC), propene carbonate (PC), diethyl carbonate (DEC) are mixed with 40: 40: 20 mass ratio, obtain nonaqueous solvents, and with lithium hexafluoro phosphate (LiPF
6) be dissolved in the above-mentioned nonaqueous solvents as lithium salts, obtain basic electrolyte.
The preparation of lithium ion battery:
With active material LiNi
0.5Co
0.2Mn
0.3O
2(LNCM), after conductive agent acetylene black, binding agent polyvinylidene fluoride (PVDF) fully mixes in N-methyl pyrrolidone dicyandiamide solution by mass ratio at 96: 2: 2, be coated on oven dry on the Al paper tinsel, cold pressing, obtain anode pole piece.
With active material graphite, conductive agent acetylene black, binding agent butadiene-styrene rubber (SBR), thickener carboxymethyl cellulose sodium (CMC) according to mass ratio 95: 2: 2: 1 in the deionized water solvent system, fully mix after; Be coated on oven dry on the Cu paper tinsel, cold pressing, obtain cathode pole piece.
With polyethylene (PE) porous polymer film as barrier film.
Anode pole piece, barrier film, cathode pole piece are folded in order, make barrier film be in the middle effect of playing isolation of kathode, and coiling is obtained naked electric core.Naked electric core is placed external packing, inject the basic electrolyte and the encapsulation that prepare.
Embodiment 1
The preparation of electrolyte:
Ethylene carbonate (EC), propene carbonate (PC), diethyl carbonate (DEC) are mixed with 40: 40: 20 mass ratio, obtain nonaqueous solvents, and with lithium hexafluoro phosphate (LiPF
6) be dissolved in the above-mentioned nonaqueous solvents as lithium salts, obtain basic electrolyte.And then in basic electrolyte, add the 2-butene nitrile as additive, make the quality of 2-butene nitrile account for the 3wt% of electrolyte gross mass.
The preparation of lithium ion battery:
With positive active material LiNi
0.5Co
0.2Mn
0.3O
2(LNCM), after conductive agent acetylene black, binding agent polyvinylidene fluoride (PVDF) fully mixes in N-methyl pyrrolidone dicyandiamide solution by mass ratio at 96: 2: 2, be coated on oven dry on the Al paper tinsel, cold pressing, obtain anode pole piece.
With negative electrode active material Delanium, conductive agent acetylene black, binding agent butadiene-styrene rubber (SBR), thickener carboxymethyl cellulose sodium (CMC) according to mass ratio 95: 2: 2: 1 in the deionized water solvent system, fully mix after; Be coated on oven dry on the Cu paper tinsel, cold pressing, obtain cathode pole piece.
With polyethylene (PE) porous polymer film as barrier film.
Anode pole piece, barrier film, cathode pole piece are folded in order, make barrier film be in the middle effect of playing isolation of kathode, and coiling is obtained naked electric core.Naked electric core is placed external packing, inject the basic electrolyte and the encapsulation that prepare.
Embodiment 2
Different with embodiment 1 is; The nonaqueous solvents of electrolyte is the mixture of dimethyl carbonate (DMC), diethyl carbonate (DEC) and ethylene carbonate (EC); Three's mass ratio was respectively 40: 40: 20; Additive is 4-dodecyl-3-butene nitrile, and the 4-dodecyl-quality of 3-butene nitrile accounts for the 0.1wt% of electrolyte gross mass.
Positive active material is cobalt acid lithium (LiCoO
2); Negative electrode active material is the mixture of native graphite and hard carbon, and the mass ratio of the two was respectively 85: 15.
All the other repeat no more with embodiment 1 here.
Embodiment 3
Different with embodiment 1 is; The nonaqueous solvents of electrolyte is the mixture of methyl ethyl carbonate (EMC), gamma-butyrolacton and vinylene carbonate (VC); Three's mass ratio was respectively 80: 10: 10; Additive is 3-methyl-3-butene nitrile, and the 3-methyl-quality of 3-butene nitrile accounts for the 0.5wt% of electrolyte gross mass.
Positive active material is cobalt acid lithium (LiCoO
2) and lithium nickelate (LiNiO
2) mixture, the mass ratio of the two was respectively 90: 10; Negative electrode active material is the mixture of Delanium and soft carbon, and the mass ratio of the two was respectively 70: 30.
All the other repeat no more with embodiment 1 here.
Embodiment 4
Different with embodiment 1 is; The nonaqueous solvents of electrolyte is carbonic acid first propyl ester (PMC), fluorinated ethylene carbonate (FEC) and N; The mixture of dinethylformamide (DMF); Three's mass ratio was respectively 90: 5: 5, and additive is 3-cycloalkyl-4-phenyl-3-butene nitrile, and 3-cycloalkyl-4-phenyl-quality of 3-butene nitrile accounts for the 1wt% of electrolyte gross mass.
Positive active material is LiMn2O4 (LiMnO
2) and lithium nickelate (LiNiO
2) mixture, the mass ratio of the two was respectively 20: 80; Negative electrode active material is a silicon.
All the other repeat no more with embodiment 1 here.
Embodiment 5
Different with embodiment 1 is; The nonaqueous solvents of electrolyte is the mixture of ethylene carbonate (EC), ethyl acetate and N-methyl pyrrolidone (NMP); Three's mass ratio was respectively 95: 2: 3; Additive is that 3-phenyl-4-encircles octyl group-allyl acetonitrile, and the quality of 3-phenyl-4-ring octyl group-allyl acetonitrile accounts for the 5wt% of electrolyte gross mass.
Positive active material is lithium nickel cobalt aluminum oxide (LiNi
0.5Co
0.2Al
0.3O
2) (LNCA) and lithium nickelate (LiNiO
2) mixture, the mass ratio of the two was respectively 20: 80; Negative electrode active material is the mixture of Si oxide and silicon-carbon compound, and the mass ratio of the two was respectively 60: 40.
All the other repeat no more with embodiment 1 here.
Embodiment 6
Different with embodiment 1 is; The nonaqueous solvents of electrolyte is the mixture of dimethyl carbonate (DMC), diethyl carbonate (DEC) and ethylene carbonate (EC); Three's mass ratio was respectively 40: 40: 20, and additive is the 3-butene nitrile, and the quality of 3-butene nitrile accounts for the 3wt% of electrolyte gross mass.
Positive active material is LiMn2O4 (LiMnO
2) and cobalt acid lithium (LiCoO
2) mixture, the quality of the two is respectively than being 45: 55; Negative electrode active material is the mixture of Delanium, native graphite and hard carbon, and three's mass ratio was respectively 50: 45: 5.
All the other repeat no more with embodiment 1 here.
Embodiment 7
Different with embodiment 1 is; The nonaqueous solvents of electrolyte is the mixture of ethylene carbonate (EC), ethene sulfurous acid number and acetonitrile; Three's mass ratio was respectively 85: 10: 5; Additive be 10-to benzene hexyl-9-decene nitrile, and 10-accounts for the 8wt% of electrolyte gross mass to the quality of benzene hexyl-9-decene nitrile.
Positive active material is Li, Ni, Mn oxide (LiNi
0.5Mn
0.5O
2), LiMn2O4 (LiMnO
2) and cobalt acid lithium (LiCoO
2) mixture, three's quality is respectively than being 10: 20: 70; Negative electrode active material is a lithium titanate.
All the other repeat no more with embodiment 1 here.
Embodiment 8
Different with embodiment 1 is; The nonaqueous solvents of electrolyte is the mixture of propene carbonate (PC), methyl-sulfoxide (DMSO) and methyl butyrate; Three's mass ratio was respectively 75: 10: 15; Additive is 5-heptyl-6-cyclohexyl-5-hexene nitrile, and the quality of 5-heptyl-6-cyclohexyl-5-hexene nitrile accounts for the 10wt% of electrolyte gross mass.
Positive active material is LiMn2O4 (LiMnO
2) and cobalt acid lithium (LiCoO
2) mixture, the quality of the two is respectively than being 45: 55; Negative electrode active material is the silicon-carbon compound.
All the other repeat no more with embodiment 1 here.
Embodiment 9
Different with embodiment 1 is; The nonaqueous solvents of electrolyte is the mixture of dimethyl carbonate (DMC), diethyl carbonate (DEC) and propene carbonate (PC); Three's mass ratio was respectively 50: 30: 20; Additive is 3-ethyl-4-cyclopropyl-3-butene nitrile, and 3-ethyl-4-cyclopropyl-quality of 3-butene nitrile accounts for the 15wt% of electrolyte gross mass.
Positive active material is lithium nickelate (LiNiO
2) and cobalt acid lithium (LiCoO
2) mixture, the quality of the two is respectively than being 45: 55; Negative electrode active material is the mixture of Delanium, native graphite and soft carbon, and three's mass ratio was respectively 50: 45: 5.
All the other repeat no more with embodiment 1 here.
Embodiment 10
Different with embodiment 1 is; The nonaqueous solvents of electrolyte is the mixture of dimethyl carbonate (DMC), diethyl carbonate (DEC) and propene carbonate (PC); Three's mass ratio was respectively 70: 10: 20, and additive is the 3-butene nitrile, and the quality of 3-butene nitrile accounts for the 2wt% of electrolyte gross mass.
Positive active material is lithium nickel cobalt aluminum oxide (LiNi
0.5Co
0.2Al
0.3O
2) (LNCA) and lithium nickelate (LiNiO
2) mixture, the quality of the two is respectively than being 40: 60; Negative electrode active material is the mixture of Delanium, native graphite and hard carbon, and three's mass ratio was respectively 50: 45: 5.
All the other repeat no more with embodiment 1 here.
The battery capacity test
The battery of Comparative Examples 1 and embodiment 1 to 10 is respectively got 5; At normal temperatures with 0.5C multiplying power constant current charge to voltage 4.25V; Further under the 4.2V constant voltage, charging to electric current is 0.04C, and further being discharged to voltage with 0.5C multiplying power constant current is 2.9V.The discharge capacity of getting final step 0.5C constant current with the quality of this capacity divided by anodal effective active matter, obtains the specific discharge capacity of each battery positive electrode active material as battery capacity.The average data of the specific discharge capacity of each Battery pack is as shown in table 1.
The high temperature storage test
The battery of Comparative Examples 1, embodiment 1 to 10 is respectively got 5, is 4.25V with 0.5C multiplying power constant current charge to voltage at normal temperatures, and further under the 4.2V constant voltage, charging to electric current is 0.04C, makes it be in the 4.2V fully charged state.Full rechargable battery thickness before the test storage also is designated as D
0Battery with fully charged state places 85 ℃ of baking ovens again, after four hours, battery is taken out, and tests the thickness after its storage immediately and is designated as D
1According to the thickness swelling before and after the following formula counting cell storage
ε＝(D
1-D
0)/D
0×100％
The average thickness expansion rate of each Battery pack of gained is as shown in table 1.
By contrast 1 in the table 1, data among the embodiment 1 and 6 can find out, the 3-butene nitrile of in basic electrolyte, introducing 2-butene nitrile or 3% mass ratio of 3% mass ratio all can effectively improve the high-temperature storage performance of electric core.56.1% thickness swelling after 85 ℃ of storages of basic electrolyte battery introduces that the thickness swelling of battery is respectively 12.9%, 13.8% behind the 2-butene nitrile, 3-butene nitrile of 3% mass ratio, and tool improves significantly.Yet than the anodal specific capacity performance of basic electrolyte 149.4mAh/g, introduce that the anodal specific capacity performance of battery is respectively 140.3mAh/g and 147.1mAh/g behind the 2-butene nitrile, 3-butene nitrile of 3% mass ratio, descended 6.1% and 1.9% respectively.From finding out here, 2-butene nitrile and 3-butene nitrile all improve significantly to the high-temperature storage performance of battery, but the itrile group of 2-butene nitrile directly links to each other with ethylene linkage, and its conjugated structure can bring bigger anodal specific capacity loss; The carbon atom of being separated by between the itrile group of 3-butene nitrile and the ethylene linkage, the loss that aligns the ultimate ratio capacity is just much little.Therefore, the itrile group of this compound preferred structure and the carbon number between the ethylene linkage are not 0.
Comparative Examples 1 can be found out with the data among the embodiment 2 to 10 from table 1, and behind the introducing additive of the present invention, the anodal specific capacity of electric core can decrease in basic electrolyte.When the introducing amount of additive less than 1% the time, the loss amount of anodal specific capacity is less than 0.5%; When additive introducing amount was 5%, the loss of anodal specific capacity was 1.3%; When the introducing amount of additive reached 15%, the loss of anodal specific capacity reached 11.9%.Yet along with increasing of additive introducing amount, the thickness swelling of electric core after 85 ℃ of storages also reduces gradually.Thickness swelling after 85 ℃ of storages of Comparative Examples 1 battery reaches 56%, and after introducing 1% additive, thickness swelling is reduced to 17.1%; Additive introducing amount is 15% o'clock, and thickness swelling is merely 6.9%.The consideration of integrated capacity and thickness swelling, 0.1～15% introducing amount for such additive optimization.
The positive discharge specific capacity of the lithium ion battery of table 1 Comparative Examples 1 and embodiment 1 to 10 and 85 ℃ of storage thickness swellings
According to the announcement and the instruction of above-mentioned specification, those skilled in the art in the invention can also change and revise above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should fall in the protection range of claim of the present invention modifications more of the present invention and change.In addition, although used some specific terms in this specification, these terms are explanation for ease just, the present invention is not constituted any restriction.
Claims (10)
1. a lithium-ion battery electrolytes comprises nonaqueous solvents and is dissolved in the lithium salts in the nonaqueous solvents, and it is characterized in that: described electrolyte also comprises additive, and said additive is the compound by formula (I) expression:
Formula I
R wherein
1, R
2, R
3Be selected from hydrogen atom, contain 1～12 carbon atom alkyl, contain the cycloalkyl of 3～8 carbon atoms and contain the aromatic radical of 6～12 carbon atoms, n is 0～7 integer.
2. lithium-ion battery electrolytes according to claim 1 is characterized in that: the quality of said additive accounts for the 0.1wt% of electrolyte gross mass to 15wt%.
3. lithium-ion battery electrolytes according to claim 2 is characterized in that: the quality of said additive accounts for the 1wt% of electrolyte gross mass to 10wt%.
4. lithium-ion battery electrolytes according to claim 2 is characterized in that: the quality of said additive accounts for the 2wt% of electrolyte gross mass to 5wt%.
5. lithium-ion battery electrolytes according to claim 1 is characterized in that: n is 1～7 integer in the described additive.
6. lithium-ion battery electrolytes according to claim 3 is characterized in that: described additive is the 3-butene nitrile.
7. lithium-ion battery electrolytes according to claim 1; It is characterized in that: described solvent is ethylene carbonate, propene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methyl ethyl carbonate, carbonic acid first propyl ester, vinylene carbonate, fluorinated ethylene carbonate, methyl formate, ethyl acetate, methyl butyrate, methyl acrylate, ethene sulfite, propylene sulfite, dimethyl sulfite, diethyl sulfite, acid anhydrides, N-methyl pyrrolidone, N-NMF, N-methylacetamide, acetonitrile, N, at least a in dinethylformamide, sulfolane, methyl-sulfoxide, methyl sulfide, gamma-butyrolacton and the oxolane.
8. lithium ion battery; Comprise plus plate current-collecting body and be coated in positive active material, the negative current collector on the plus plate current-collecting body and be coated in negative electrode active material, barrier film and the electrolyte on the negative current collector that it is characterized in that: said electrolyte is each described lithium-ion battery electrolytes of claim 1 to 7.
9. lithium ion battery according to claim 8 is characterized in that: described positive active material comprises at least a in lithium and cobalt oxides, lithium nickel oxide, lithium manganese oxide, Li, Ni, Mn oxide, lithium nickel cobalt manganese oxidation thing and the lithium nickel cobalt aluminum oxide.
10. lithium ion battery according to claim 8 is characterized in that: described negative electrode active material comprises at least a in soft carbon, hard carbon, Delanium, native graphite, silicon, silicon oxide compound, silicon-carbon compound or the lithium titanate.
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| CN103078141A (en) * | 2013-01-25 | 2013-05-01 | 宁德新能源科技有限公司 | Lithium-ion secondary battery and electrolyte thereof |
| CN104332649A (en) * | 2014-09-09 | 2015-02-04 | 上海纳米技术及应用国家工程研究中心有限公司 | Electrolyte, and preparation method and application thereof |
| CN105514435A (en) * | 2016-01-28 | 2016-04-20 | 江苏金坛汽车工业有限公司 | Lithium ion battery negative electrode sizing agent and preparation method thereof |
| CN105990602A (en) * | 2015-02-24 | 2016-10-05 | 江苏省新动力电池及其材料工程技术研究中心有限公司 | Method for manufacturing high-capacity high-power power type lithium ion battery |
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| CN113871712A (en) * | 2021-09-24 | 2021-12-31 | 远景动力技术(江苏)有限公司 | Lithium ion battery electrolyte, preparation method thereof and lithium ion battery |
| CN114556662A (en) * | 2021-03-30 | 2022-05-27 | 宁德新能源科技有限公司 | Electrolyte and electrochemical device containing same |
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