CN104979588A - Lithium ion battery non-aqueous electrolyte and lithium ion battery - Google Patents
Lithium ion battery non-aqueous electrolyte and lithium ion battery Download PDFInfo
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- CN104979588A CN104979588A CN201510400798.3A CN201510400798A CN104979588A CN 104979588 A CN104979588 A CN 104979588A CN 201510400798 A CN201510400798 A CN 201510400798A CN 104979588 A CN104979588 A CN 104979588A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
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Abstract
The present invention relates to a lithium ion battery non-aqueous electrolyte and a lithium ion battery, wherein the non-aqueous electrolyte comprises an organic solvent, a lithium salt and an additive, and the additive comprises (calculated as the weight of the non-aqueous electrolyte) 0.1-2 wt% of 1,2,3-trifluorobenzene. According to the present invention, 1,2,3-trifluorobenzene is added to the electrolyte as the additive so as to effectively improve the compatibility of the electrolyte and the electrode sheet and improve the electrolyte permeability on the electrode; and the 1,2,3-trifluorobenzene has the positive electrode film forming effect so as to protect the positive electrode and improve the high-temperature storage property and the cycle property.
Description
Technical field
The present invention relates to technical field of electrochemistry, is a kind of non-aqueous electrolyte for lithium ion cell and lithium ion battery specifically.
Background technology
Lithium ion battery is because its outstanding chemical property, and the characteristics such as safety and environmental protection are most popular at present, the most widely used secondary cell.Along with new-energy automobile improving constantly and development that 3C digital product is lightening course continuation mileage, battery industry more and more requires lithium ion battery high-energy-density.High-energy-densityization realizes mainly through two approach at present, takes high power capacity positive pole and high power capacity negative pole exactly.High power capacity positive pole comparatively ripe is at present high voltage cobalt acid lithium material mainly, as ripe 4.35V and the high voltage lithium cobaltate cathode being about to ripe 4.4V; High power capacity negative pole mainly contains high-pressure solid graphite cathode and silicon-carbon alloy material.Larger volumetric expansion is there is in silicon-carbon alloy material in cyclic process, the greatly deteriorated cycle performance of meeting, this problem is also difficult to solve at present, so high power capacity silicon-carbon alloy negative material is also difficult to realize commercialization in a short time, and common high power capacity negative pole mainly high-pressure solid graphite cathode.The compacted density of high-pressure solid graphite cathode is generally at 1.6 ~ 1.75g/cm
3, and technology is comparatively ripe, high volume applications is in 3C digital battery, negative pole compacting 1.8g/cm
3or more will be the technological trend of next step high power capacity graphite cathode.
3C comparatively ripe is at present digital with lithium ion battery with high energy density mainly high voltage cobalt acid lithium battery, and the positive pole compacted density of this battery system is generally at 4.0g/cm
3above, negative pole compacted density is generally at 1.65g/cm
3above.In the battery system of this high-pressure solid, often there is the problem of electrolyte permeability difficulty.Because the compacted density of positive and negative electrode is large, electrode slice is thicker, space between electrode material granules is less, cause being difficult in the electrolyte short time penetrate into pole piece inside, thus cause electrolyte recoverable amount in cell fabrication processes not enough, there is cycle performance of battery wretched insufficiency and the problem analysing lithium, simultaneously because electrolyte is in the problem of high-pressure solid positive and negative electrode contacting permeation difficulty, contact internal resistance between electrolyte and electrode is increased, also can affect the performance of battery capacity and the charge-discharge performance of large multiplying power.
In order to solve the problem of electrolyte permeability difficulty in high-pressure solid battery system, prior art proposes the way of adding fluorobenzene compounds in the electrolytic solution.Such as:
(1) patent No. is CN103715454A, patent name is the patent of invention of " a kind of electrolyte for lithium ion battery and the secondary cell containing this electrolyte ", disclose the fluorobenzene compounds that to add with electrolyte total weight be in the electrolytic solution 1-15%, the fluorobenzene compounds adopted is selected from p-fluorotoluene, 2-fluorotoluene, 3-fluorotoluene, 1, 3-difluorobenzene, benzotrifluoride, p-fluorophenol, to chlorofluorobenzene, P-Bromofluorobenzene, the bromo-4-fluorophenol of 2-, 2, 4-dichlor fluorbenzene, to fluorobenzene MSM, 5-ethyl fluoro benzoate, 1-acetoxyl group-2-fluorobenzene, 1-acetoxy-3-fluorobenzene, 1-acetoxyl group-4-fluorobenzene, 2-acetoxyl group-2, 4-difluorobenzene, at least one in pi-allyl phenyl-pentafluoride,
(2) patent No. is CN103531864A, and patent name is the patent of invention of " a kind of lithium ion battery and electrolyte thereof ", discloses the fluorobenzene adding in the electrolytic solution and count 1.0-5.0% with electrolyte weight;
(3) patent No. is CN104466248A, and patent name is the patent of invention of " a kind of electrolyte and use the lithium ion battery of this electrolyte ", discloses the fluorobenzene adding in the electrolytic solution and count 0.1-15% with electrolyte weight.
The fluorobenzene compounds that above-mentioned patent is added, improve the permeance property of electrolyte to a certain extent, improve battery capacity, improve charge-discharge performance and the high/low temperature storge quality of battery, but lifting limited efficiency, and for compacted density at 1.65g/cm
3above graphite cathode material, the permeance property of above-mentioned electrolyte promotes and not obvious, therefore seek a kind of permeance property that significantly can promote electrolyte especially in negative pole compacted density at 1.65g/cm
3the electrolysis additive of the permeance property in above battery system, becomes the large technical barrier that those skilled in the art are urgently to be resolved hurrily.
Summary of the invention
Technical problem to be solved by this invention is to provide the non-aqueous electrolyte for lithium ion cell that a kind of permeance property is better, be applicable to more high compacted density battery system, and and then provide that a kind of capacitance is higher, charge-discharge performance and high-temperature stability can better lithium ion batteries.
In order to solve the problems of the technologies described above, the technical solution used in the present invention one is:
A kind of non-aqueous electrolyte for lithium ion cell, comprising:
Organic solvent;
Lithium salts;
And additive, described additive comprises 1,2, the 3-trifluoro-benzene counting 0.1wt%-2wt% with electrolyte weight.
In order to solve the problems of the technologies described above, the technical solution used in the present invention two is:
A kind of lithium ion battery, comprise positive pole, negative pole, barrier film and nonaqueous electrolytic solution, described nonaqueous electrolytic solution comprises organic solvent, lithium salts and additive, and described additive comprises 1,2, the 3-trifluoro-benzene counting 0.1wt%-2wt% with electrolyte weight.
Beneficial effect of the present invention is: be different from existing electrolyte, the present invention adds 1 of 0.1wt%-2wt% in electrolyte, 2,3-trifluoro-benzene, due to 1,2,3-trifluoro-benzene contains the F atom of three strong electron-withdrawing group groups, and three F atom are in adjacent position, the compatibility of electrolyte and electrode interface can be improved, significantly reduce the contact angle between electrolyte and high-pressure solid graphite cathode, play the effect of surfactant-like, improve the adhesive force between electrolyte and electrode, thus significantly improve the permeability of electrolyte.Adopt the lithium ion battery that electrolyte of the present invention is obtained, there is high power capacity conservation rate, excellent cycle performance and high-temperature storage performance.
Embodiment
By describing technology contents of the present invention in detail, being realized object and effect, be explained below in conjunction with execution mode.
The design of most critical of the present invention is: adopt 1,2,3-trifluoro-benzene as the additive of electrolyte, compare existing fluorobenzene compounds, effectively can improve the compatibility of electrolyte and pole piece, improve the permeance property of electrolyte on pole piece.
Concrete, non-aqueous electrolyte for lithium ion cell provided by the invention, comprising:
Organic solvent;
Lithium salts;
And additive, described additive comprises 1,2, the 3-trifluoro-benzene counting 0.1wt%-2wt% with electrolyte weight.
Know-why of the present invention is:
1,2,3-trifluoro-benzene contains the F atom of three strong electron-withdrawing group groups, and three F atom are in adjacent position, significantly can reduce the contact angle between electrolyte and high-pressure solid graphite cathode, reduce the surface tension of electrolyte on pole piece, have the effect of surfactant-like, improve the adhesive force between electrolyte and electrode, thus significantly improve the permeability of electrolyte.1,2,3-trifluoro-benzene also has positive pole filming function simultaneously, and formed film can protect positive pole, thus improves high-temperature storage performance and the cycle performance of battery.Therefore existing electrolyte compared by electrolyte provided by the invention, and infiltration and wetting property better, are applicable to more high compacted density battery system, and obtained lithium ion battery has high power capacity conservation rate, excellent cycle performance and high-temperature storage performance.
For the content of 1,2,3-trifluoro-benzene in electrolyte, when the content of 1,2,3-trifluoro-benzene is less than 0.1%, it is to the limited compatibility improved between electrolyte and pole piece, does not have duely improve effect to the permeance property of electrolyte; When its content is greater than 2%, easily in positive pole generation oxidation Decomposition, positive pole interface impedance is caused to increase, deterioration.
Further, in described lithium-ion battery electrolytes, described electrolysis additive also comprises the additive of one or more combinations in vinylene carbonate, fluorinated ethylene carbonate, PS.The additives such as vinylene carbonate, fluorinated ethylene carbonate or PS, are excellent cathode film formation additives, effectively can improve the cycle performance of battery.
Further, in described lithium-ion battery electrolytes, described electrolysis additive also comprises two nitrile compounds.
Dinitrile compound, can with metal ion generation complexing, reduce electrolyte decomposition, suppress digestion of metallic ion, protection positive pole, improve battery high-temperature behavior.
Further, described dinitrile compound is selected from one or more in succinonitrile, glutaronitrile, adiponitrile, pimelic dinitrile, hexamethylene dicyanide, azelaic dinitrile and sebacic dinitrile.
Further, described non-aqueous organic solvent is selected from one or more in ethylene carbonate, propene carbonate, butylene, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate and methyl propyl carbonate.
Further, described non-aqueous organic solvent is the composition of ethylene carbonate, diethyl carbonate and methyl ethyl carbonate.
Further, described lithium salts is selected from one or more in lithium hexafluoro phosphate, lithium perchlorate, LiBF4, two fluorine Lithium bis (oxalate) borate, two (trimethyl fluoride sulfonyl) imine lithium and two fluorine sulfimide lithium salts.
Concrete, lithium ion battery provided by the invention, comprises positive pole, negative pole, barrier film and nonaqueous electrolytic solution, described nonaqueous electrolytic solution comprises organic solvent, lithium salts and additive, described additive comprises 1,2, the 3-trifluoro-benzene counting 0.1wt%-2wt% with electrolyte weight.
Further, described lithium ion battery, the compacted density of its negative material is more than or equal to 1.65g/cm
3.
Further, described additive also comprise vinylene carbonate, fluorinated ethylene carbonate, PS one or more.
Further, described additive also comprises two nitrile compounds, described dinitrile compound be selected from succinonitrile, glutaronitrile, adiponitrile, pimelic dinitrile, hexamethylene dicyanide, azelaic dinitrile and sebacic dinitrile one or more.
Further, described lithium salts is selected from one or more in lithium hexafluoro phosphate, lithium perchlorate, LiBF4, two fluorine Lithium bis (oxalate) borate, two (trimethyl fluoride sulfonyl) imine lithium and two fluorine sulfimide lithium salts.
Further, described lithium ion battery, its charge cutoff voltage is greater than 4.2V and is less than or equal to 4.5V.
Embodiment 1
The preparation method of the present embodiment lithium ion battery, comprises positive pole preparation process, negative pole preparation process, electrolyte preparation process, barrier film preparation process and battery number of assembling steps;
Described positive pole preparation process is: by the mass ratio mixing high-voltage anode active material cobalt acid lithium of 96.8:2.0:1.2, conductive carbon black and binding agent polyvinylidene fluoride, be dispersed in METHYLPYRROLIDONE, obtain anode sizing agent, anode sizing agent is uniformly coated on the two sides of aluminium foil, through drying, rolling and vacuumize, and burn-on after aluminum lead-out wire with supersonic welder and obtain positive plate, the thickness of pole plate is between 120-150 μm, and the compacted density being controlled negative material by the surface density of positive electrode and roll-in thickness is 4.0g/cm
3;
Described negative pole preparation process is: compare admixed graphite by the quality of 96:1:1.2:1.8, conductive carbon black, binding agent butadiene-styrene rubber and carboxymethyl cellulose, dispersion in deionized water, obtain cathode size, cathode size is coated on the two sides of Copper Foil, through drying, rolling and vacuumize, and burn-on after nickel making outlet with supersonic welder and obtain negative plate, the thickness of pole plate is between 120-150 μm, and the compacted density being controlled negative material by the surface density of negative material and roll-in thickness is 1.65g/cm
3;
Described electrolyte preparation process is: by ethylene carbonate, diethyl carbonate and methyl ethyl carbonate by volume for EC:DEC:EMC=1:1:1 mixes, the lithium hexafluoro phosphate that concentration is 1.0mol/L is added after mixing, add based on electrolyte total weight 0.1% 1,2,3-trifluoro-benzene is as additive.
The test of time of penetration: in dehumidifying room, under steady temperature, get the little pole piece that the obtained positive and negative electrode pole piece of part is cut into formed objects size, accurately drip the electrolyte of 2 μ l respectively on positive and negative electrode pole piece, meter record electrolyte is absorbed the time used completely on pole piece.
Described barrier film preparation process is: adopt polypropylene, polyethylene and polypropylene three layers of barrier film, thickness is 20 μm;
Battery number of assembling steps is: between positive plate and negative plate, place three layers of barrier film that thickness is 20 μm, then the sandwich structure that positive plate, negative plate and barrier film form is reeled, square aluminum metal-back is put into after being flattened by coiling body again, the lead-out wire of both positive and negative polarity is welded on the relevant position of cover plate respectively, and with laser-beam welding machine, cover plate and metal-back are welded as a whole, obtain the battery core treating fluid injection; The electrolyte of above-mentioned preparation is injected battery core by liquid injection hole, and the amount of electrolyte will ensure the space be full of in battery core.
The routine of then carrying out initial charge according to the following steps changes into: 0.05C constant current charge 3min, 0.2C constant current charge 5min, 0.5C constant current charge 25min, shelve 1hr, shaping is sealed, then further with the electric current constant current charge of 0.2C to 4.35V, after normal temperature shelf 24hr, with the electric current constant-current discharge of 0.2C to 3.0V.
1) normal-temperature circulating performance test: at 25 DEG C, the battery 1C constant current constant voltage after changing into is charged to 4.35V, then uses 1C constant-current discharge to 3.0V.The conservation rate of the 500th circulation volume is calculated, internal resistance growth rate and thickness swelling after charge/discharge 500 circulations.Computing formula is as follows:
500th circulation volume conservation rate (%)=(the 500th cyclic discharge capacity/first time cyclic discharge capacity) × 100%;
Original depth × 100% before thickness swelling (%) after 500th circulation=(after the 500th circulation the front original depth of thickness-circulation)/circulation;
Initial internal resistance × 100% before internal resistance growth rate (%) after 500th circulation=(after the 500th circulation the front initial internal resistance of internal resistance-circulation)/circulation;
2) high-temperature storage performance: the battery after changing into is charged to 4.35V with 1C constant current constant voltage at normal temperatures, measure initial battery thickness, initial discharge capacity, then store 30 days at 60 DEG C, finally wait battery to be cooled to normal temperature and survey battery final thickness again, calculate cell thickness expansion rate; Maintenance capacity and the recovery capacity that 3V measures battery is discharged to afterwards with 1C.Computing formula is as follows:
Cell thickness expansion rate (%)=(final thickness-original depth)/original depth × 100%;
Battery capacity conservation rate (%)=maintenance capacity/initial capacity × 100%;
Capacity resuming rate (%)=recovery capacity/initial capacity × 100%.
Embodiment 2
Repeat embodiment 1, difference is to add 1,2, the 3-trifluoro-benzene of 0.5% in electrolyte as additive.
Embodiment 3
Repeat embodiment 1, difference is to add 1,2, the 3-trifluoro-benzene of 1% in electrolyte as additive.
Embodiment 4
Repeat embodiment 1, difference is to add 1,2, the 3-trifluoro-benzene of 2% in electrolyte as additive.
Embodiment 5
Repeat embodiment 1, difference is 1,2, the 3-trifluoro-benzene adding 1% in electrolyte, and the fluorinated ethylene carbonate (FEC) of 3%, 1, the 3-propane sultone (PS) of 3% is as additive.
Embodiment 6
Repeat embodiment 1, difference is 1,2, the 3-trifluoro-benzene adding 1% in electrolyte, and the fluorinated ethylene carbonate (FEC) of 3%, 1, the 3-propane sultone (PS) of 3%, the succinonitrile (SN) of 1% is as additive.
Embodiment 7
Repeat embodiment 1, difference is to add 1,2, the 3-trifluoro-benzene of 1% in electrolyte as additive, and the compacted density of prepared negative material is 1.7g/cm
3.
Embodiment 8
Repeat embodiment 1, difference is to add 1,2, the 3-trifluoro-benzene of 1% in electrolyte as additive, and the compacted density of prepared negative material is 1.75g/cm
3.
Comparative example 1
Repeat embodiment 1, difference is not add any additive in electrolyte.
Comparative example 2
Repeat embodiment 1, difference is to add 1,3, the 5-trifluoro-benzene of 1% in electrolyte as additive.
Comparative example 3
Repeat embodiment 1, difference is to add 1,2, the 4-trifluoro-benzene of 1% in electrolyte as additive.
Comparative example 4
Repeat embodiment 1, difference is the fluorinated ethylene carbonate (FEC) adding 3% in electrolyte, and 1, the 3-propane sultone (PS) of 3%, the succinonitrile (SN) of 1% is as additive.
Comparative example 5
Repeat embodiment 1, difference is not add any additive in electrolyte, and the compacted density of prepared negative material is 1.7g/cm
3.
Comparative example 6
Repeat embodiment 1, difference is not add any additive in electrolyte, and the compacted density of prepared negative material is 1.75g/cm
3.
Comparative example 7
Repeat embodiment 1, difference is to add the fluorobenzene of 1% in electrolyte as additive.
Comparative example 8
Repeat embodiment 1, difference is to add 1, the 3-difluorobenzene of 1% in electrolyte as additive.
Comparative example 9
Repeat embodiment 1, difference is to add the benzotrifluoride of 1% in electrolyte as additive.
Comparative example 10
Repeat embodiment 1, difference is to add the pi-allyl phenyl-pentafluoride of 1% in electrolyte as additive.
The specifying information of above-described embodiment and comparative example is shown in Table 1.
Table 1
Above-described embodiment and comparative example test the time of penetration data that obtain in table 2, test the data of normal temperature circulation and the high-temperature storage obtained in table 3.
Table 2
As can be seen from the data of table 2, when not adding any additive (comparative example 1, comparative example 5-6), along with the raising of the compacted density of high-pressure solid positive and negative electrode, the penetrating power of electrolyte declines gradually; In interpolation 1,3,5-trifluoro-benzene (comparative example 2), 1,2,4-trifluoro-benzene (comparative example 3) or other are when being different from fluorobenzene compounds (comparative example 7-10) or other additives (comparative example 4) of 1,2,3-trifluoro-benzene, electrolyte without significant change, is 1.65g/cm in compacted density in the time of penetration of high-pressure solid positive and negative electrode
3the time of penetration of graphite cathode material only shortened to 600s by 647s, permeance property promotes not obvious; And when interpolation 1,2,3-trifluoro-benzene, electrolyte obtains shortening in various degree respectively in the time of penetration of high-pressure solid positive and negative electrode, wherein the shortening of negative material time of penetration is more obvious, is 1.65g/cm in compacted density
3the time of penetration of graphite cathode material shortened to by 647s that below 510s is even minimum is down to 310s, permeance property obtains remarkable lifting, and along with the increase of negative material compacted density, 1, the improvement of 2,3-trifluoro-benzene to the permeance property of electrolyte is more obvious (when compacted density is 1.7g/cm
3time, time of penetration has shortened to 330s by 700s, and permeance property promotes nearly 1.06 times; When compacted density is 1.75g/cm
3time, time of penetration has shortened to 350s by 843s, and permeance property promotes nearly 1.2 times).
Therefore, the present invention by adding 1,2 in electrolyte, 3-trifluoro-benzene, changes the surface property of electrolyte, improves the adhesive force of electrolyte and pole piece, improve the permeance property of electrolyte on pole piece particularly on negative pole, be particularly useful for negative pole compacted density at 1.65g/cm
3above battery system.
Table 3
As can be seen from the data of table 3, with not containing compared with the electrolyte infiltrating additive, and containing 1,3,5-trifluoro-benzene, 1,2,4-trifluoro-benzene, other fluorobenzene compounds or other types additive are compared, the normal-temperature circulating performance and the high-temperature storage performance that with the addition of the battery obtained by electrolyte of 1,2,3-trifluoro-benzene are all significantly improved.Positive electrode used in embodiment is cobalt acid lithium, if positive electrode changes ternary material into, has equal improvement effect.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalents utilizing description of the present invention to do, or be directly or indirectly used in relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a non-aqueous electrolyte for lithium ion cell, is characterized in that: comprise organic solvent, lithium salts and additive, and described additive comprises 1,2, the 3-trifluoro-benzene counting 0.1wt%-2wt% with nonaqueous electrolytic solution weight.
2. non-aqueous electrolyte for lithium ion cell according to claim 1, is characterized in that: described additive also comprise vinylene carbonate, fluorinated ethylene carbonate, PS one or more.
3. non-aqueous electrolyte for lithium ion cell according to claim 1, it is characterized in that: described additive also comprises dinitrile compound, described dinitrile compound be selected from succinonitrile, glutaronitrile, adiponitrile, pimelic dinitrile, hexamethylene dicyanide, azelaic dinitrile and sebacic dinitrile one or more.
4. non-aqueous electrolyte for lithium ion cell according to claim 1, is characterized in that: described lithium salts be selected from lithium hexafluoro phosphate, lithium perchlorate, LiBF4, two fluorine Lithium bis (oxalate) borate, two (trimethyl fluoride sulfonyl) imine lithium and two fluorine sulfimide lithium salts one or more.
5. a lithium ion battery, comprise positive pole, negative pole, barrier film and nonaqueous electrolytic solution, it is characterized in that: described nonaqueous electrolytic solution comprises organic solvent, lithium salts and additive, described additive comprises counts 1 of 0.1wt%-2wt% with nonaqueous electrolytic solution weight, 2,3-trifluoro-benzene.
6. lithium ion battery according to claim 5, is characterized in that: the compacted density of described negative pole is more than or equal to 1.65g/cm
3.
7. lithium ion battery according to claim 5, is characterized in that: described additive also comprise in vinylene carbonate, fluorinated ethylene carbonate, PS one or more.
8. lithium ion battery according to claim 5, it is characterized in that: described additive also comprises dinitrile compound, described dinitrile compound be selected from succinonitrile, glutaronitrile, adiponitrile, pimelic dinitrile, hexamethylene dicyanide, azelaic dinitrile and sebacic dinitrile one or more.
9. lithium ion battery according to claim 5, is characterized in that: described lithium salts be selected from lithium hexafluoro phosphate, lithium perchlorate, LiBF4, two fluorine Lithium bis (oxalate) borate, two (trimethyl fluoride sulfonyl) imine lithium and two fluorine sulfimide lithium salts one or more.
10. lithium ion battery according to claim 5, is characterized in that: the charge cutoff voltage of battery is greater than 4.2V and is less than or equal to 4.5V.
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| CN105680088A (en) * | 2016-02-03 | 2016-06-15 | 东莞市凯欣电池材料有限公司 | Non-aqueous electrolyte solution for high-voltage lithium ion secondary battery and high-voltage lithium ion secondary battery |
| CN105826600A (en) * | 2016-05-18 | 2016-08-03 | 东莞市凯欣电池材料有限公司 | Nonaqueous electrolyte solution for lithium ion batteries and lithium ion batteries |
| WO2018006565A1 (en) * | 2016-07-08 | 2018-01-11 | 深圳新宙邦科技股份有限公司 | Lithium ion battery using non-aqueous electrolyte |
| JP2018200893A (en) * | 2018-09-12 | 2018-12-20 | 株式会社日本触媒 | Nonaqueous electrolyte and lithium ion secondary battery comprising the same |
| CN109119690A (en) * | 2018-08-03 | 2019-01-01 | 深圳市山木新能源科技股份有限公司 | A kind of low-temperature resistance lithium battery |
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| CN109830748A (en) * | 2019-01-22 | 2019-05-31 | 东莞市天丰电源材料有限公司 | A kind of lithium-ion battery electrolytes |
| CN110121811A (en) * | 2017-02-03 | 2019-08-13 | 株式会社Lg化学 | Method for manufacturing the lithium secondary battery with improved high-temperature storage characteristics |
| CN110148776A (en) * | 2019-05-31 | 2019-08-20 | 广州天赐高新材料股份有限公司 | A kind of lithium secondary cell electrolyte and lithium secondary battery reducing battery impedance |
| CN112687956A (en) * | 2020-12-28 | 2021-04-20 | 远景动力技术(江苏)有限公司 | Non-aqueous electrolyte of lithium battery and lithium ion battery based on same |
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| CN111463485B (en) * | 2020-04-09 | 2022-05-10 | 杉杉新材料（衢州）有限公司 | Lithium ion battery electrolyte and lithium ion battery |
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| CN110121811B (en) * | 2017-02-03 | 2021-11-02 | 株式会社Lg化学 | Method for manufacturing lithium secondary battery having improved high-temperature storage characteristics |
| CN110121811A (en) * | 2017-02-03 | 2019-08-13 | 株式会社Lg化学 | Method for manufacturing the lithium secondary battery with improved high-temperature storage characteristics |
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| WO2020238191A1 (en) * | 2019-05-31 | 2020-12-03 | 广州天赐高新材料股份有限公司 | Lithium secondary battery electrolyte capable of reducing battery impedence, and lithium secondary battery |
| CN110148776A (en) * | 2019-05-31 | 2019-08-20 | 广州天赐高新材料股份有限公司 | A kind of lithium secondary cell electrolyte and lithium secondary battery reducing battery impedance |
| CN112687956A (en) * | 2020-12-28 | 2021-04-20 | 远景动力技术(江苏)有限公司 | Non-aqueous electrolyte of lithium battery and lithium ion battery based on same |
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| CN109585921A (en) | 2019-04-05 |
| CN109585921B (en) | 2021-12-14 |
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