CN104934636A - Electrolyte and lithium ion battery containing same - Google Patents
Electrolyte and lithium ion battery containing same Download PDFInfo
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- CN104934636A CN104934636A CN201510336967.1A CN201510336967A CN104934636A CN 104934636 A CN104934636 A CN 104934636A CN 201510336967 A CN201510336967 A CN 201510336967A CN 104934636 A CN104934636 A CN 104934636A
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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
- 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
- H01M10/0569—Liquid materials characterised by the solvents
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- 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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- 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
- H01M2300/0028—Organic electrolyte characterised by the solvent
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Abstract
The invention relates to an electrolyte. The electrolyte comprises a lithium salt, a solvent and an addition agent, wherein the solvent comprises a chain carboxylic acid ester compound, the addition agent is a phosphonic acid cyclic anhydride compound, particularly, the content of the chain carboxylic acid ester compound is 5 to 60 percent based on the total weight of the solvent, and the content of the phosphonic acid cyclic anhydride compound is 0.1 to 4 percent based on the total weight of the electrolyte. The electrolyte provided by the invention is applied to a lithium ion battery, the cathode of the battery can be stabilized, the energy density of lithium ion battery can be improved, charging time is accelerated, and meanwhile, lithium deposition phenomenon is relieved. The application also provides the lithium ion battery, and the lithium ion battery has excellent electrochemical performance due to the containing of the electrolyte provided by the application.
Description
Technical field
The application relates to field of lithium, especially, relates to a kind of electrolyte and comprises the lithium ion battery of this electrolyte.
Background technology
At present, the energy density improving lithium ion battery has following several mode:
One, adopt the positive electrode of high voltage system, but under high voltage system, bath composition is unstable;
Two, the negative material of high power capacity is adopted, such as, negative pole doped silicon material, but the negative plate of the negative material of doped silicon expands serious, and cycle efficieny is lower first;
Three, adopt positive plate and the negative plate of the high and high compacted density of coating weight, but when adopting positive plate and the negative plate of the high and high compacted density of coating weight, the wettability of electrolyte can be deteriorated, and especially, lithium ion battery easily analyses lithium in charging process.
In addition, lithium battery quick charge be realized, need the time of strengthening rate of charge and extending constant current charge in charging process.But in large multiplying power charging process, the temperature of lithium battery can up to tens degrees Celsius, thus can cause lithium battery overheated, cause lithium battery to burn or blast, cause the safety problems such as fire further.In addition, when selecting large multiplying power to charge, also can exist and analyse lithium risk.
Therefore, need badly now and a kind ofly there is excellent rapid charge characteristic and suppress low temperature to analyse the electrolyte of lithium performance.
Summary of the invention
In order to solve the problem, the applicant has carried out studying with keen determination, found that: the electrolyte including phosphoric acid cyclic anhydride compounds and chain carboxylic acid ester compound, can improve the chemical property of lithium ion battery, thus complete the application.
The object of the application is to provide a kind of electrolyte, comprises lithium salts, solvent and additive, and wherein, described additive is phosphoric acid cyclic anhydride compounds, and described solvent comprises chain carboxylic acid ester compound.
Especially, one or more for being selected from the compound shown in following formula I of described additive:
wherein,
R
3, R
4, R
5independently of one another for be selected from carbon number be 1 ~ 20 alkyl, carbon number be the aryl of 6 ~ 18, the one in hydrogen atom.
Another object of the application is to provide a kind of lithium ion battery, comprises the electrolyte that positive plate, negative plate, lithium battery diaphragm and the application provide.
The electrolyte that the application provides, the stability of lithium ion cell positive can not only be improved, and the chemical property of lithium ion battery can be improved, such as, the energy density of lithium ion battery and charge rate, improve simultaneously lithium ion battery at low temperatures analyse lithium situation.
Embodiment
Be described in detail below by the application, the feature of the application and advantage will illustrate along with these and become more clear, clear and definite.
The object of the application is to provide a kind of electrolyte, comprises lithium salts, solvent and additive, and wherein, described additive is phosphoric acid cyclic anhydride compounds, and described solvent comprises chain carboxylic acid ester compound.
In this application, described phosphoric acid cyclic anhydride compounds is for containing
the compound of group, wherein, the singly-bound that the short-term on each phosphorus atoms is formed after all representing and losing atom or atomic group.
In above-mentioned electrolyte, the not special restriction of concrete kind of described phosphoric acid cyclic anhydride compounds, can select according to the actual requirements.
In a preferred embodiment, one or more for being selected from the compound shown in following formula I of described additive:
In above-mentioned formula I, R
3, R
4, R
5independently of one another for be selected from carbon number be 1 ~ 20 alkyl, carbon number be the aryl of 6 ~ 18, the one in hydrogen atom.
In above-mentioned formula I, R
3, R
4, R
5independently choose arbitrarily above-mentioned group separately, especially, R
3, R
4, R
5all identical.
In this application, R is worked as
3, R
4, R
5independently of one another for carbon number be the alkyl of 1 ~ 20 time, the concrete kind of alkyl is not subject to concrete restriction, and chain alkyl and cyclic alkane base, can select according to the actual requirements.Especially, the linear paraffin base selected and cyclic alkane base.More particularly, linear paraffin base is selected.
In this application, linear paraffin base is the chain alkyl without side chain.
In this application, R is worked as
3, R
4, R
5independently of one another for carbon number be the aryl of 6 ~ 18 time, the not special restriction of the concrete kind of aryl, can select according to the actual requirements.Especially, aryl is phenyl, benzene alkyl.
In a preferred embodiment, R
3, R
4, R
5independently of one another for be selected from carbon number be 1 ~ 10 alkyl, carbon number be the aryl of 7 ~ 10, the one in hydrogen atom.
In further preferred embodiment, R
3, R
4, R
5independently of one another for be selected from carbon number be 2 ~ 6 alkyl, carbon number be the aryl of 7 ~ 9, the one in hydrogen atom.
Further preferred embodiment in, R
3, R
4, R
5independently of one another for be selected from carbon number be 3 ~ 6 alkyl, carbon number be the benzene alkyl of 7 ~ 9, the one in hydrogen atom.
As the example of phosphoric acid cyclic anhydride compounds, specifically can enumerate:
In above-mentioned electrolyte, the not special restriction of content of described additive, can select according to the actual requirements.
In a preferred embodiment, the content of described additive is 0.1 ~ 4% of the total weight of electrolyte, further, the content of additive is preferably 0.2 ~ 3.5% of the total weight of electrolyte, further, the content of additive is preferably 0.3 ~ 3% of the total weight of electrolyte, most preferably is 0.5 ~ 3%.
Study discovery through the applicant, the content of additive is too low, can not improve stability and the energy density of the positive pole of lithium ion battery, in addition, the too high levels of additive, then can reduce the rapid charge characteristic of lithium ion battery on the contrary, strengthens simultaneously and analyse lithium phenomenon.
In this application, phosphoric acid cyclic anhydride compounds can synthesize according to the method for routine.
In above-mentioned electrolyte, mentioned chain carboxylic acid ester compound is for containing
the chain compound of group.
In a preferred embodiment, one or more for being selected from the compound shown in Formula Il of described chain carboxylic acid ester compound:
In above-mentioned formula II, R
1, R
2independently of one another for being selected from the alkyl that carbon number is 1 ~ 9, wherein, carbon number is the not special restriction of concrete kind of the alkyl of 1 ~ 9, can select according to the actual requirements.Especially, linear paraffin base is selected.
In above-mentioned formula II, R
1, R
2can be the same or different, not special restriction, can select according to the actual requirements.
In a preferred embodiment, R
1, R
2independently of one another for being selected from the alkyl that carbon number is 2 ~ 8, further preferably, R
1, R
2independently of one another for being selected from the alkyl that carbon number is 3 ~ 6, still more preferably, R
1, R
2independently of one another for being selected from the alkyl that carbon number is 3 ~ 5.
As the example of chain carboxylic acid ester compound, specifically can enumerate: ethyl acetate, propyl acetate, ethyl propionate, n propyl propionate, isopropyl propionate, n-butyl propionate, isobutyl propionate, n-pentyl propionate, isoamyl propionate, n-butyric acie propyl ester, propyl isobutyrate, n-butyric acie n-pentyl ester, isobutyric acid n-pentyl ester, n-butyl n-butyrate, isobutyl isobutyrate, positive amyl pentanoate, hexyl hexanoate.
Discovery is studied through the applicant, because electrolyte comprises chain carboxylic acid ester compound and phosphoric acid cyclic anhydride compounds, under both actings in conjunction, the positive plate in the wettability of electrolyte, the large multiplying power charging performance improving lithium ion battery, stabilize lithium ion battery can not only be improved, promote the energy density of lithium ion battery, and the risk that lithium ion battery is rapidly heated and the charge rate improving lithium ion battery can be reduced, in addition, can also alleviate and analyse lithium phenomenon.Wherein, mentioned energy density is the energy comprised in unit volume.
In addition, select the electrolyte provided by the application, the end of charge voltage of lithium ion battery can be made to be 4.35 ~ 5V.
In the electrolyte that the application provides, the not special restriction of content of chain carboxylic acid ester compound, can select according to the actual requirements.
In a preferred embodiment, the content of chain carboxylic acid ester compound is 5 ~ 60% of the total weight of solvent, further, the content of chain carboxylic acid ester compound is preferably 8 ~ 50% of the total weight of solvent, further, the content of chain carboxylic acid ester compound is preferably 10 ~ 40% of the total weight of solvent, most preferably is 15 ~ 35%.
Study discovery through the applicant, the content of chain carboxylic acid ester compound is too low, can not improve the rapid charge characteristic of lithium ion battery, and the too high levels of chain carboxylic acid ester compound can not improve the rapid charge characteristic of lithium ion battery.
In above-mentioned electrolyte, the concrete kind of described lithium salts is not subject to concrete restriction, and organic lithium salt and inorganic lithium salt can be selected according to the actual requirements.
In a preferred embodiment, described lithium salts is selected from lithium hexafluoro phosphate (LiPF
6), two trifluoromethanesulfonimide lithium (LiN (CF
3sO
2)
2, be abbreviated as LiTFSI), two (fluorine sulphonyl) imine lithium (Li (N (SO
2f)
2, be abbreviated as LiFSI), di-oxalate lithium borate (LiB (C
2o
4)
2, be abbreviated as LiBOB), difluorine oxalic acid boracic acid lithium (LiBF
2(C
2o
4), be abbreviated as LiDFOB), LiBF4 (LiBF
4), lithium perchlorate (LiClO
4), hexafluoroarsenate lithium (LiAsF
6) and trifluoromethayl sulfonic acid lithium (LiCF
3sO
3) in one or more.
Especially, described lithium salts is selected from lithium hexafluoro phosphate, LiBF4, lithium perchlorate, hexafluoro close in arsenic acid lithium, two trifluoromethanesulfonimide lithium, trifluoromethayl sulfonic acid lithium and di-oxalate lithium borate one or more, more particularly, lithium salts is lithium hexafluoro phosphate.
In above-mentioned electrolyte, the content of lithium salts is not subject to concrete restriction, can select according to the actual requirements, especially, lithium salts content is in the electrolytic solution make lithium salts molar concentration 0.8 ~ 1.4mol/L in the electrolytic solution, more particularly, lithium salts content in the electrolytic solution makes lithium salts molar concentration in the electrolytic solution be 1mol/L.
In above-mentioned electrolyte, the not special restriction of concrete kind of the material that solvent comprises, can select according to the actual requirements.Especially, solvent comprises one or more in nonaqueous solvents.More particularly, solvent comprises one or more in non-aqueous organic solvent.
As the example of non-aqueous organic solvent, specifically can enumerate: ethylene carbonate (EC), propene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), gamma-butyrolacton (BL), oxolane (THF).
Study discovery through the present inventor, select these non-aqueous organic solvents specifically enumerated, the energy density of lithium ion battery can be improved further, shorten the charging interval and reduce further and analyse lithium risk.
In this application, the not special restriction of preparation method of electrolyte, adopts conventional method to prepare.Such as, all the other components of lithium salts, solvent except chain carboxylic acid ester compound, chain carboxylic acid ester compound and additive are mixed, obtain electrolyte.Wherein, the not special restriction of order of addition of material, can select according to demand.
Especially, lithium salts is joined in solvent and mixes, then add additive, chain carboxylic acid ester compound successively.
Another object of the application is to provide a kind of lithium ion battery, comprises the electrolyte provided by the application.
In above-mentioned lithium ion battery, also comprise positive plate, negative plate and lithium battery diaphragm.
In above-mentioned lithium ion battery, positive plate comprises plus plate current-collecting body and the positive pole coat on plus plate current-collecting body, and negative plate comprises negative current collector and the negative pole coat on negative current collector.
In above-mentioned lithium ion battery, described positive pole coat comprises positive electrode active materials, binding agent and conductive agent.
In above-mentioned lithium ion battery, described negative pole coat comprises negative active core-shell material, negative electrode binder and cathode conductive agent.Especially, negative active core-shell material is selected from one or more in graphite and silicon.
In above-mentioned lithium ion battery, described positive electrode active materials, binding agent, conductive agent, negative active core-shell material, negative electrode binder, cathode conductive agent and lithium battery diaphragm all have no particular limits, and can select according to the actual requirements.
In a preferred embodiment, the compacted density of negative plate is 1.40 ~ 2.0g/cm
3.Wherein, compacted density is the thickness of surface density/material.Find after deliberation, the negative pole compacted density of lithium ion battery is too low, and the energy density of lithium ion battery can be caused to reduce, and compacted density is too high, is unfavorable for the further lifting of charge rate.
In a preferred embodiment, described positive electrode active materials is selected from one or more in cobalt acid lithium, lithium-nickel-manganese-cobalt ternary material, LiFePO4 and LiMn2O4.
Embodiment
The application is further described below by way of instantiation.But these examples are only exemplary, do not form any restriction to the protection range of the application.
In following embodiment, comparative example and test example, the reagent used, material and instrument as there is no special explanation, all commercially available acquisition.
In following experimental example, comparative example and test example, used material is as follows:
Solvent: ethylene carbonate (referred to as EC), diethyl carbonate (referred to as DEC); Lithium salts: LiPF
6.
Additive:
(additive 1),
(additive 2),
(additive 3),
(additive 4),
(additive 5),
(additive 6),
(additive 7),
(additive 8),
(additive 9),
(additive 10),
(additive 11),
(additive 12).
Chain carboxylic acid ester compound: n propyl propionate (PP), n-butyl propionate (BP), ethyl propionate (EP), ethyl acetate (EA), propyl acetate (PA).
Embodiment one electrolyte 1
#~ 24
#preparation
Electrolyte 1
#~ 24
#be prepared by the following method:
In drying shed, after being mixed by EC and DEC, add lithium salts, then add additive and chain carboxylic acid ester compound, mix, obtain electrolyte, wherein, the addition of EC and DEC is EC: DEC=1: 1 for making EC and DEC weight ratio, and the addition of lithium salts is for making LiPF
6molar concentration is in the electrolytic solution 1mol/L.
In the process of above-mentioned preparation, concrete kind and the consumption thereof of used additive, chain carboxylic acid ester compound are as shown in table 1 below.
Table 1
The preparation of comparative example electrolyte 1 ~ 4
Prepare electrolyte according to the method provided in embodiment, wherein, in preparation process, the material of interpolation and consumption thereof are as shown in Table 2 below.
Table 2
Note: table 2 gets the bid-and place is considered as not choosing any additive or chain carboxylic acid ester compound.
Test example
the preparation of positive plate
Be the binding agent polyvinylidene fluoride (PVDF) of 10%, 0.16kg electrically conductive graphite and 7.2kg positive electrode active materials LiCoO by 1.42kg METHYLPYRROLIDONE (NMP), 1.2kg mass fraction
2after mixing, obtain anode sizing agent, then anode sizing agent being coated on equably thickness is on the plus plate current-collecting body aluminium foil of 16 μm, finally coated plus plate current-collecting body is carried out successively toasting, compacting, to cut, acquire positive plate, wherein, baking temperature is 120 DEG C, and baking time is 1 hour.
the preparation of negative plate
Be thickener sodium carboxymethylcellulose (CMC) solution of 1.5% by 1.2kg mass fraction, 0.07kg mass fraction be 50% binding agent SBR emulsion, 2.4kg negative active core-shell material powdered graphite fully mix, obtain cathode size, then cathode size being coated on equably thickness is on the negative current collector Copper Foil of 12 μm, finally coated plus plate current-collecting body carried out successively toasting, cold pressing, cut, acquire negative plate, wherein, baking temperature is 120 DEG C, and baking time is 1 hour.
the preparation of lithium ion battery
Be that the polypropylene barrier film of 12 μm is separated by above-mentioned positive plate and the negative plate thickness of preparing, and be wound into square naked battery core, load aluminum foil sack afterwards, at 80 DEG C after baking, inject electrolyte, then carry out successively sealing, change into and being vented, obtain lithium ion battery.
In the preparation of above-mentioned lithium ion battery, inject the electrolyte 1 that embodiment obtains respectively
#~ 24
#, obtain electrolyte 1 ~ 4 in comparative example, correspondingly successively obtain lithium ion battery 1
#~ 24
#, lithium ion battery 1 ~ 4.
performance of lithium ion battery is tested
1, energy density test
By the lithium ion battery 1 obtained
#~ 24
#, lithium ion battery 1 ~ 3 carries out following test respectively:
At 25 DEG C, with under 1C constant current/constant voltage condition, by lithium ion cell charging to 4.35V, shelve 10min, with 1C constant-current discharge extremely by voltage 3.0V (often organizing 5 batteries), detect the energy obtaining each lithium ion battery, then calculate the energy density of lithium ion battery according to the following equation, result is as shown in table 3.
Energy density (Wh/L)=energy/volume (wherein, W represents watt, and h represents hour, and volume represents battery core volume, is battery core thickness * battery core width * battery core length)
2, charging performance test
By the lithium ion battery 1 obtained
#~ 24
#, lithium ion battery 1 ~ 4 carries out following test respectively:
At 25 DEG C, lithium ion battery is left standstill 30 minutes, afterwards with the multiplying power constant-current discharge of 0.5C to 3.0V, and leave standstill after 5 minutes, lithium ion battery is charged to 4.35V (often organizing 5 batteries) with the multiplying power constant current/constant voltage of 1.5C, and record the time be charged to required for 80% depth of charge afterwards, result is as shown in table 3, wherein, depth of charge is lithium ion battery ratio from the capacity when electricity of extrinsic current acceptance and its fully charged state in charging process.
3, lithium performance test is analysed for 12 DEG C
By the lithium ion battery 1 obtained
#~ 24
#, lithium ion battery 1 ~ 4 carries out following test respectively:
At 12 DEG C, lithium ion battery is charged to 4.35V with 1.5C constant current/constant voltage, after shelving 10min, with 0.5C constant-current discharge extremely by voltage 3.0V, after circulating 10 weeks by above-mentioned condition, lithium ion battery is charged to 4.35V with 1.5C constant current/constant voltage, then disassembles battery, observe lithium ion battery negative interface and whether analyse lithium (often organizing 5 batteries), result is as shown in table 3.
4,0 DEG C of charging performance test
By the lithium ion battery 1 obtained
#~ 24
#, lithium ion battery 1 ~ 4 carries out following test respectively:
At 0 DEG C, lithium ion battery is charged to 4.35V with 1C constant current/constant voltage, after shelving 10min, with 0.5C constant-current discharge extremely by voltage 3.0V, after circulating 10 weeks by above-mentioned condition, lithium ion battery is charged to 4.35V with 1C constant current/constant voltage, then disassembles battery, observe lithium ion battery negative interface and whether analyse lithium (often organizing 5 batteries), result is as shown in table 3.
Table 3
Note: in table 3, PD represents the compacted density of negative plate.
Can be learnt by data in table 3: the electrolyte 1 ~ 4 provided in comparative example, owing to containing phosphoric acid cyclic anhydride compounds and chain carboxylic acid ester compound or all there are not above-mentioned two kinds of compounds time different in electrolyte, be applied to after in lithium ion battery, the energy density of lithium ion battery all obviously reduces, charging interval is elongated all to some extent simultaneously, has all occurred the phenomenon seriously analysing lithium simultaneously.
Can learn by carrying out contrast with comparative example: electrolyte 1 provided in an embodiment
#~ 24
#owing to including phosphoric acid cyclic anhydride compounds and chain carboxylic acid ester compound in electrolyte simultaneously, be applied in after in lithium ion battery, obviously improve the energy density of lithium ion battery, shorten the charging interval, improve charge rate, make the lithium phenomenon of analysing of lithium ion battery significantly improve simultaneously.
The announcement of book according to the above description, the application those skilled in the art can also carry out suitable change and amendment to above-mentioned execution mode.Therefore, the application is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the application some modifications and changes of the application.
Claims (10)
1. an electrolyte, is characterized in that, comprises lithium salts, solvent and additive, and wherein, described additive is phosphoric acid cyclic anhydride compounds, and described solvent comprises chain carboxylic acid ester compound.
2. electrolyte according to claim 1, is characterized in that, one or more for being selected from the compound shown in following formula I of described additive:
wherein,
R
3, R
4, R
5independently of one another for be selected from carbon number be 1 ~ 20 alkyl, carbon number be the aryl of 6 ~ 18, the one in hydrogen atom.
3. electrolyte according to claim 1, is characterized in that, the content of described additive is 0.1 ~ 4% of electrolyte total weight.
4. electrolyte according to claim 1, is characterized in that, one or more for being selected from the compound shown in Formula Il of described chain carboxylic acid ester compound:
Wherein, R
1, R
2independently of one another for being selected from the alkyl that carbon number is 1 ~ 9.
5. electrolyte according to claim 1, it is characterized in that, described chain carboxylic acid ester compound be selected from ethyl acetate, propyl acetate, ethyl propionate, n propyl propionate, isopropyl propionate, n-butyl propionate, isobutyl propionate, n-pentyl propionate, isoamyl propionate, n-butyric acie propyl ester, propyl isobutyrate, n-butyric acie n-pentyl ester, isobutyric acid n-pentyl ester, n-butyl n-butyrate, isobutyl isobutyrate, positive amyl pentanoate, hexyl hexanoate one or more.
6. electrolyte according to claim 1, is characterized in that, the content of described chain carboxylic acid ester compound is 5 ~ 60% of the total weight of solvent.
7. the electrolyte according to any one of claim 1 ~ 6, it is characterized in that, described solvent also comprise in following substances one or more: ethylene carbonate, propene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, gamma-butyrolacton and oxolane.
8. the electrolyte according to any one of claim 1 ~ 6, it is characterized in that, described lithium salts is lithium hexafluoro phosphate, two trifluoromethanesulfonimide lithium, two (fluorine sulphonyl) imine lithium, di-oxalate lithium borate, difluorine oxalic acid boracic acid lithium, LiBF4, lithium perchlorate, hexafluoro close in arsenic acid lithium and trifluoromethayl sulfonic acid lithium one or more.
9. a lithium ion battery, is characterized in that, comprises the electrolyte according to any one of positive plate, negative plate, lithium battery diaphragm and claim 1 ~ 8.
10. lithium ion battery according to claim 9, is characterized in that, the compacted density of described negative plate is 1.4 ~ 2.0g/cm
3.
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| CN105655641A (en) * | 2016-03-30 | 2016-06-08 | 宁德新能源科技有限公司 | Electrolyte and lithium ion battery thereof |
| CN106299474A (en) * | 2016-09-20 | 2017-01-04 | 东莞市航盛新能源材料有限公司 | Lithium titanate battery electrolyte and battery goods thereof |
| CN106602131A (en) * | 2015-10-16 | 2017-04-26 | 宁德新能源科技有限公司 | Lithium ion battery |
| CN107017431A (en) * | 2016-01-28 | 2017-08-04 | 宁德新能源科技有限公司 | Nonaqueous electrolytic solution and lithium ion battery |
| WO2017185703A1 (en) * | 2016-04-29 | 2017-11-02 | 华为技术有限公司 | High-temperature lithium-ion battery electrolyte solution and preparation method therefor and high-temperature lithium-ion battery |
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| CN113785428A (en) * | 2020-03-31 | 2021-12-10 | 宁德新能源科技有限公司 | Method for improving battery cycle performance and electronic device |
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