CN109980282A - A kind of low temperature resistant non-aqueous electrolyte for lithium ion cell and lithium ion battery - Google Patents
A kind of low temperature resistant non-aqueous electrolyte for lithium ion cell and lithium ion battery Download PDFInfo
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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
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- H01M10/0567—Liquid materials characterised by the additives
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- 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
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- H—ELECTRICITY
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- 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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- 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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- H01M2300/0042—Four or more solvents
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Abstract
The present invention relates to field of lithium ion battery, and in particular to a kind of low temperature resistant non-aqueous electrolyte for lithium ion cell and lithium ion battery.Low temperature resistant non-aqueous electrolyte for lithium ion cell of the invention includes electrolyte lithium salt, non-aqueous organic solvent and film for additive, includes conventional film for additive and the low temperature resistant additive with formula (I) structure in the film for additive.The low temperature resistant additive can form a film prior to solvent in negative electrode material surface reduction, it is low to be formed by SEI membrane impedance, be conducive to the insertion and abjection of ion, to increase substantially the cryogenic property of lithium ion battery, in the non-aqueous organic solvent other than conventional carbonate-based solvent, it also include carboxylic acid esters solvent, the fusing point and viscosity for making entire electrolyte system are greatly lowered, when battery is under the conditions of low temperature (- 40 DEG C), migration of the lithium ion between positive and negative anodes also can guarantee.
Description
Technical field
The present invention relates to field of lithium ion battery, it is specifically related to a kind of low temperature resistant non-aqueous electrolyte for lithium ion cell and lithium
Ion battery.
Background technique
Lithium ion battery is due to being answered extensively with high working voltage, wide operating temperature range and advantages of environment protection
For fields such as 3C digital product, electric cars.In 3C digital domain, such as smart phone, mobile power source, lithium ion battery to
Lighter, thinner trend development, while in order to meet certain Special use environment, such as military project or extreme low temperature environment, may require that
Battery can be used in -40 DEG C of low temperature or more low temperature environment, this requires battery have higher low temperature resistant charge-discharge performance or
Person's low temperature performance.
The non-aqueous electrolyte for lithium ion cell being commercialized at present, for requirement under the low temperature environment of pole, electrolyte it is molten
Agent composition is generally ethylene carbonate, propene carbonate, methyl ethyl carbonate and carboxylate mixing, wherein carboxylate additive amount
Increase, battery low temperature performance is improved, but will cause the deterioration of battery room temperature cycle performance.
CN200810030976.81 discloses a kind of low temperature electrolytes for Li-ion batteries, by methyl formate and r- butyrolactone
Equal carboxylates are added in lithium-ion battery electrolytes as additive；2012, Li electricity Co., Ltd, Air China preparation lithium from
Sub- battery low-temperature electrolyte is using ethyl acetate as one of four kinds of solvents of low-temperature electrolyte.The above-mentioned prior art, although
The cryogenic property of battery can be increased substantially, but does not have good low form film for additive in invention, after will cause battery
Phase circulation diving not can effectively solve battery low temperature discharge, low-temperature circulating and room temperature cycles performance be bad or what is reduced asks
Topic.To solve the above-mentioned problems, it finds very urgent with the new low temperature resistant additive of exploitation and new solvent combination.
Summary of the invention
The purpose of the invention is to overcome the shortcomings of above-mentioned background technique, it is non-to provide a kind of low temperature resistant lithium ion battery
Water electrolysis liquid and lithium ion battery contain conventional film for additive and resistance to low in low temperature resistant lithium-ion battery electrolytes of the invention
Warm additive, the low temperature resistant additive can form a film prior to solvent in negative electrode material surface reduction, be formed by SEI membrane impedance
It is low, be conducive to the insertion and abjection of ion, to increase substantially the cryogenic property of lithium ion battery.
To achieve the goals above, the low temperature resistant non-aqueous electrolyte for lithium ion cell that the present invention uses includes electrolyte lithium
Salt, non-aqueous organic solvent and film for additive comprising conventional film for additive and have formula (I) structure in the film for additive
Low temperature resistant additive:
Further, the quality of the low temperature resistant additive accounts for the 0.3%~1.0% of the electrolyte gross mass.
Further, the conventional film for additive be vinylene carbonate (VC), 1,3- propylene sultones (PST),
1,3- propane sultone (PS), fluorinated ethylene carbonate (FEC), sulfuric acid vinyl ester (DTD), 4- methyl ethyl sulfate, 4-
Ethyl sulfuric acid ethyl, 4- propyl ethyl sulfate, sulfuric acid acrylic ester, three (trimethyl silane) borates (TMSB) and three (three
Methyl-monosilane) one of phosphate (TMSP) or a variety of.
Preferably, when including vinylene carbonate (VC), fluorinated ethylene carbonate in the conventional film for additive
(FEC), 1,3- propane sultone (PS), sulfuric acid vinyl ester (DTD), three (trimethyl silane) borates (TMSB) and three (three
Methyl-monosilane) phosphate (TMSP) when, the vinylene carbonate (VC), 1,3- propane sultone (PS), fluoro carbonic acid second
Enester (FEC), sulfuric acid vinyl ester (DTD), three (trimethyl silane) borates (TMSB) and three (trimethyl silane) phosphates
(TMSP) additive amount account for respectively electrolyte gross mass 0.1%~0.3%, 0.8%~1.2%, 1.5%~2.5%,
1.5%~2.5%, 0.4%~0.6%, 0.4%~0.6%.
It is highly preferred that comprising accounting for the vinylene carbonate of electrolyte gross mass 0.2%, accounting in the routine film for additive
1, the 3- propane sultone of electrolyte gross mass 1.0% and the fluorinated ethylene carbonate for accounting for electrolyte gross mass 2.0%, into one
Step also includes to account for the sulfuric acid vinyl ester of electrolyte gross mass 2.0%, or account for electrolyte in the routine film for additive preferably
Three (trimethyl silane) borates of gross mass 0.5%, or account for three (trimethyl silane) phosphoric acid of electrolyte gross mass 0.5%
Ester.
Preferably, the electrolyte lithium salt is lithium hexafluoro phosphate；It is highly preferred that the electrolyte lithium salt quality accounts for electrolyte
The 10.0%~13.0% of gross mass.
Further, the electrolyte lithium salt is lithium hexafluoro phosphate (LiPF6), double fluorine sulfimide lithiums, difluorophosphate
(LiPO2F2), LiBF4 (LiBF4) and one of difluorine oxalic acid boracic acid lithium (LiDFOB) or a variety of, and the electrolyte
The additive amount of lithium salts accounts for the 12.5%~13.5% of the electrolyte gross mass；Preferably, double fluorine sulphurs in the electrolyte lithium salt
Imide li, difluorophosphate, LiBF4 or difluorine oxalic acid boracic acid lithium additive amount account for the electrolyte gross mass
0.5%~0.8%；It is highly preferred that the electrolyte lithium salt be account for the electrolyte gross mass 12.5% lithium hexafluoro phosphate and
The difluorophosphate of the electrolyte gross mass 0.8% is accounted for, or/and accounts for the difluoro oxalate boron of the electrolyte gross mass 0.5%
Sour lithium/Zhan Suoshu electrolyte gross mass 0.3% LiBF4.
It further, include cyclic carbonate, linear carbonate and carboxylic acid esters solvent in the non-aqueous organic solvent；It is excellent
Selection of land, the cyclic carbonate are selected from one of ethylene carbonate (EC) and propene carbonate (PC) or a variety of；The chain
Ester is selected from one of dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) or a variety of, and the carboxylic acid esters solvent has formula
(II) structure:
Wherein R1And R2Alkyl or fluoro-alkyl are respectively indicated, and the alkyl carbon number is less than or equal to 4, carbochain is straight chain
Or there is branch, fluorine atom can be in end group in the fluoro-alkyl, can also be on branch.
Preferably, the carboxylic acid esters solvent is methyl formate, Ethyl formate, propyl formate, butyl formate, methyl acetate
(MA), ethyl acetate (EA), propyl acetate (PA), butyl acetate, methyl propionate, ethyl propionate (EP), propyl propionate (PP), third
One of acid butyl ester, methyl butyrate (EB), ethyl butyrate (EB), propyl butyrate, butyl butyrate are a variety of.
Preferably, the ethylene carbonate (EC) accounts for the 15.0%~30.0% of non-aqueous organic solvent gross mass, such as
20%；The propene carbonate (PC) accounts for the 5.0%~15.0% of non-aqueous organic solvent gross mass, such as 10%；The carbonic acid
Methyl ethyl ester (EMC) accounts for the 5.0%~15.0% of non-aqueous organic solvent gross mass, such as 10%；The carboxylic acid esters solvent addition
Amount accounts for the 50.0%~80.0% of electrolyte quality；It is highly preferred that the ethylene carbonate, propene carbonate, methyl ethyl carbonate
Mass ratio with carboxylic acid esters solvent is 2:1:1:6.
The present invention also provides a kind of low temperature resistant lithium ion battery, comprising of the present invention resistance in the lithium ion battery
Low-temperature lithium ion battery nonaqueous electrolytic solution.
Compared with the prior art, the advantages of the present invention are as follows:
1. conventional film for additive (such as FEC and DTD) is prior to solvent in negative electrode material surface reduction, shape in the present invention
At excellent interface protective film, reduction electrode material is reacted with electrolyte；It is low to be formed by SEI membrane impedance, be conducive to lithium from
Insertion and abjection of the son in positive and negative pole material；
2. the present invention joined carboxylic acid esters solvent, make entire electrolyte on the basis of conventional carbonate-based solvent
The fusing point and viscosity of system are greatly lowered.When battery is under the conditions of low temperature (- 40 DEG C), it also can guarantee lithium ion positive and negative
Migration between pole；
3. the present invention with two kinds of lithium hexafluoro phosphate, difluorophosphate, difluorine oxalic acid boracic acid lithium and LiBF4 etc. or with
Electrolyte is made in upper electrolyte lithium salt rational proportion, not only overcomes and lacking for lithium hexafluoro phosphate shortage temperature stability is used alone
Point, and have more better cryogenic property and high rate performance.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.Additional aspect and advantage of the invention will be set forth in part in the description, partially will be under
Become obvious in the description in face, or practice through the invention is recognized.It is only used to explain this hair it should be appreciated that being described below
It is bright, it is not intended to limit the present invention.
Term "comprising" used herein, " comprising ", " containing " or its any other deformation, it is intended that covering non-exclusionism
Include.For example, composition, step, method, product or device comprising listed elements are not necessarily limited to those elements, but
It may include not expressly listed other elements or such composition, step, method, product or the intrinsic element of device.
Equivalent, concentration or other values or parameter are excellent with range, preferred scope or a series of upper limit preferred values and lower limit
When the Range Representation that choosing value limits, this should be understood as specifically disclosing by any range limit or preferred value and any range
Any pairing of lower limit or preferred value is formed by all ranges, regardless of whether the range separately discloses.For example, when open
When range " 1 to 5 ", described range should be interpreted as including range " 1 to 4 ", " 1 to 3 ", " 1 to 2 ", " 1 to 2 and 4 to
5 ", " 1 to 3 and 5 " etc..When numberical range is described herein, unless otherwise stated, otherwise the range is intended to include its end
Value and all integers and score in the range.
Indefinite article "an" before element or component of the present invention (goes out the quantitative requirement of element or component with "one"
Occurrence number) unrestriction.Therefore "one" or "an" should be read as including one or at least one, and singular
Element or component also include plural form, unless the quantity obviously only refers to singular.
Moreover, technical characteristic involved in each embodiment of the present invention as long as they do not conflict with each other can
To be combined with each other.
Embodiment 1
Electrolyte quota step: in the glove box full of argon gas, by ethylene carbonate, propene carbonate, methyl ethyl carbonate
Ester and ethyl propionate are that EC:PC:EMC:EP=20:10:10:60 is mixed in mass ratio, are then slowly added to mixed solution
The lithium hexafluoro phosphate for entering 12.5wt% is eventually adding the sub- vinyl carbonate (VC) based on electrolyte total weight 0.2wt%, is based on
The 1,3- propane sultone (PS) of electrolyte total weight 1.0wt%, the fluoro carbonic acid second based on electrolyte total weight 2.0wt%
Enester (FEC) and difluorophosphate (LiPO based on electrolyte total weight 0.8wt%2F2), embodiment 1 is obtained after mixing evenly
Lithium-ion battery electrolytes.
By the injection of prepared lithium-ion battery electrolytes by sufficiently dry artificial graphite material/cobalt acid lithium (4.2V)
In battery, battery is shelved by 45 DEG C, after high-temperature clamp chemical conversion and secondary sealing, carries out conventional partial volume.
Embodiment 2-13 and comparative example 1-6
As shown in table 1, in embodiment 2-13 and comparative example 1-6, in addition to each ingredient composition and ratio of electrolyte is added as shown in table 1
It is other same as Example 1 outside adding.
Each ingredient composition and ratio of electrolyte of 1 embodiment 1-13 of table and comparative example 1-6
Electrolyte property test
1) battery normal-temperature circulating performance is tested: at 25 DEG C, the battery after partial volume is charged to 4.2V by 0.5C constant current constant voltage,
Cut-off current 0.05C is recycled according to this then by 0.5C constant-current discharge to 3.0V, is calculated the 500th week after charge/discharge 500 times circulations
Secondary circulation volume conservation rate, calculation formula are as follows:
500th circulation volume conservation rate (%)=(the 500th cyclic discharge capacity/for the first time cyclic discharge capacity) ×
100%；
2) 45 DEG C of constant temperature storage thickness swellings and capacity surplus ratio are tested: putting battery recycled at normal temperature with 0.5C first
Charge and discharge 1 time (4.2V~3.0V), record discharge capacity C before battery storage0, then battery constant-current constant-voltage charging to 4.2V is expired
Electric state uses the thickness d before vernier caliper test battery high-temperature storage1(two diagonal lines of above-mentioned battery are distinguished by straight line
It is connected, two diagonal line crosspoints are cell thickness test point), battery is put into 45 DEG C of insulating boxs stores 7 days later, deposited
Battery is taken out after the completion of storage and tests the hot thickness d of battery after storage2, calculate cell thickness after 45 DEG C of constant temperature of battery store 7 days
Expansion rate；After battery at room temperature cooling for 24 hours, battery is subjected to constant-current discharge to 3.0V with 0.5C again, battery is recorded and deposits
Discharge capacity C after storage1, and capacity surplus ratio after 45 DEG C of constant temperature of battery store 7 days is calculated, calculation formula is as follows:
45 DEG C storage 7 days after cell thickness expansion rate=(d2-d1)/d1* 100%；
Capacity surplus ratio=C after 45 DEG C of constant temperature store 7 days1/C0* 100%.
3) -40 DEG C of discharge tests of battery: first by battery put at normal temperature with 0.5C cycle charge-discharge 1 time (4.2V~
3.0V), discharge capacity C before record battery storage2, then by battery constant-current constant-voltage charging to the full electric state of 4.2V.Battery is put in
In cryogenic box, when cryogenic box temperature drops to -40 DEG C, after shelving 4h, battery is subjected to constant-current discharge to 3.0V with 0.5C,
Discharge capacity C after record battery storage3, and -40 DEG C of constant-current discharge ratios are calculated, calculation formula is as follows:
- 40 DEG C of constant-current discharge ratio=C3/C2* 100%.
Lithium ion battery electrical property in table 2 embodiment 1-13 and comparative example 1-6
From in table 2 to embodiment 1 compared with 9 electric performance test result of embodiment: the present invention in low form film forming add
Add agent that can be obviously improved -40 DEG C of discharge performances of low temperature and room temperature cycles performance of battery, can speculate that such low form adds
Agent can form the protective film of one layer of even compact on cathode graphite material surface, this layer of SEI film has lower AC impedance,
It can be improved the migration rate of lithium ion.
From comparing in table 2 embodiment 7-9 electric performance test result: additive capacity exceeds model given to this invention
It encloses, all will be unable to reach effect shown in the present invention.When additional amount is excessive, due to, the meeting big at membrane impedance in cathode graphite interface
Lithium ion battery deteriorated low temperature performance is caused, negative effect is brought.Additional amount is very few, which can not be obviously improved battery
Cryogenic property and cycle performance.
Comparative example 2 and embodiment 1-5 electric performance test result are relatively known in table 2: carboxylic acid esters being added in electrolyte
After solvent (ethyl acetate, n-propyl acetate, ethyl propionate and propyl propionate), -40 DEG C of low temperature for capable of significantly improving battery are put
Electrical property.Reason is carboxylic acid esters solvent with lower fusing point and has lower viscosity, when lithium ion battery is in low
When under the conditions of temperature, it can guarantee migration of the lithium ion between positive and negative anodes.
Further, comparative example 3 and embodiment 1-5 electric performance test result are relatively known: being passed through compared to the prior art
Battery performance is improved using mixing lithium salts or novel conductive lithium salts, on the basis of additive of the present invention and non-aqueous organic solvent
On, the present invention is in addition to adding conventional lithium salts LiPF6, it is also added into LiPO2F2Low form lithium carbonate can be obviously improved lithium
The cryogenic property and cycle performance of ion battery substantially increase the use of battery under cryogenic.
As it will be easily appreciated by one skilled in the art that the above description is only an embodiment of the present invention, not to limit
The present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in this
Within the protection scope of invention.
Claims (10)
1. a kind of low temperature resistant non-aqueous electrolyte for lithium ion cell, the low temperature resistant non-aqueous electrolyte for lithium ion cell includes electrolyte
Lithium salts, non-aqueous organic solvent and film for additive, which is characterized in that in the film for additive comprising conventional film for additive and
Low temperature resistant additive with formula (I) structure:
2. low temperature resistant non-aqueous electrolyte for lithium ion cell according to claim 1, which is characterized in that the low temperature resistant addition
The quality of agent accounts for the 0.3%~1.0% of the electrolyte gross mass.
3. low temperature resistant non-aqueous electrolyte for lithium ion cell according to claim 1, which is characterized in that the conventional film forming adds
Adding agent is vinylene carbonate, 1,3- propylene sultones, 1,3- propane sultone, fluorinated ethylene carbonate, sulfuric acid ethylene
Ester, 4- methyl ethyl sulfate, 4- ethyl sulfuric acid ethyl, 4- propyl ethyl sulfate, sulfuric acid acrylic ester, three (trimethyl silicanes
Alkane) one of borate and three (trimethyl silane) phosphates or a variety of；Preferably, it is wrapped when in the conventional film for additive
Containing vinylene carbonate, fluorinated ethylene carbonate, 1,3- propane sultone, sulfuric acid vinyl ester, three (trimethyl silane) boric acid
When ester and three (trimethyl silane) phosphates, the vinylene carbonate, 1,3- propane sultone, fluorinated ethylene carbonate,
The additive amount of sulfuric acid vinyl ester, three (trimethyl silane) borates and three (trimethyl silane) phosphates accounts for the total matter of electrolyte respectively
0.1%~0.3%, 0.8%~1.2%, 1.5%~2.5%, 1.5%~2.5%, 0.4%~0.6%, the 0.4% of amount~
0.6%.
4. low temperature resistant non-aqueous electrolyte for lithium ion cell according to claim 3, which is characterized in that the conventional film forming adds
Add in agent comprising accounting for the vinylene carbonate of electrolyte gross mass 0.2%, accounting for the 1,3- propane sulfonic acid of electrolyte gross mass 1.0%
Lactone and the fluorinated ethylene carbonate for accounting for electrolyte gross mass 2.0%, it is further preferred that in the routine film for additive also
Comprising accounting for the sulfuric acid vinyl ester of electrolyte gross mass 2.0%, or account for three (trimethyl silane) boric acid of electrolyte gross mass 0.5%
Ester, or account for three (trimethyl silane) phosphates of electrolyte gross mass 0.5%.
5. low temperature resistant non-aqueous electrolyte for lithium ion cell according to claim 1, which is characterized in that the electrolyte lithium salt
For lithium hexafluoro phosphate；Preferably, the electrolyte lithium salt quality accounts for the 10.0%~13.0% of electrolyte gross mass.
6. low temperature resistant non-aqueous electrolyte for lithium ion cell according to claim 5, which is characterized in that the electrolyte lithium salt
For one of lithium hexafluoro phosphate, double fluorine sulfimide lithiums, difluorophosphate, LiBF4 and difluorine oxalic acid boracic acid lithium or more
Kind, and the additive amount of the electrolyte lithium salt accounts for the 12.5%~13.5% of the electrolyte gross mass；Preferably, the electrolysis
Double fluorine sulfimide lithiums in matter lithium salts, difluorophosphate, LiBF4 or difluorine oxalic acid boracic acid lithium additive amount account for the electricity
Solve the 0.5%~0.8% of liquid gross mass；It is highly preferred that the electrolyte lithium salt is to account for the electrolyte gross mass 12.5%
Lithium hexafluoro phosphate and the difluorophosphate for accounting for the electrolyte gross mass 0.8%, or/and account for the electrolyte gross mass 0.5%
Difluorine oxalic acid boracic acid lithium/Zhan Suoshu electrolyte gross mass 0.3% LiBF4.
7. low temperature resistant non-aqueous electrolyte for lithium ion cell according to claim 1, which is characterized in that described non-aqueous organic molten
It include cyclic carbonate, linear carbonate and carboxylic acid esters solvent in agent；Preferably, the cyclic carbonate is selected from ethylene carbonate
One of ester and propene carbonate are a variety of；The chain ester is selected from one of dimethyl carbonate and methyl ethyl carbonate or more
Kind, the carboxylic acid esters solvent has formula (II) structure:
Wherein R1And R2Alkyl or fluoro-alkyl are respectively indicated, and the alkyl carbon number is less than or equal to 4, carbochain is straight chain or tool
There is branch, fluorine atom can be in end group in the fluoro-alkyl, can also be on branch.
8. low temperature resistant non-aqueous electrolyte for lithium ion cell according to claim 7, which is characterized in that the carboxylic acid esters are molten
Agent be methyl formate, Ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate,
Methyl propionate, ethyl propionate, propyl propionate, butyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, one in butyl butyrate
Kind is a variety of.
9. low temperature resistant non-aqueous electrolyte for lithium ion cell according to claim 1, which is characterized in that the ethylene carbonate
Account for the 15.0%~30.0% of non-aqueous organic solvent gross mass, such as 20%；It is total that the propene carbonate accounts for non-aqueous organic solvent
The 5.0%~15.0% of quality, such as 10%；The methyl ethyl carbonate account for non-aqueous organic solvent gross mass 5.0%~
15.0%, such as 10%；The carboxylic acid esters amount of solvent accounts for the 50.0%~80.0% of electrolyte quality；It is highly preferred that
The ethylene carbonate, propene carbonate, methyl ethyl carbonate and carboxylic acid esters solvent mass ratio be 2:1:1:6.
10. a kind of low temperature resistant lithium ion battery, which is characterized in that include any one of claim 1-9 in the lithium ion battery
The low temperature resistant non-aqueous electrolyte for lithium ion cell.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029655A (en) * | 2019-12-20 | 2020-04-17 | 杉杉新材料（衢州）有限公司 | Lithium ion battery electrolyte and lithium ion battery containing same |
| CN111313090A (en) * | 2020-02-18 | 2020-06-19 | 白银科奥夫化学科技有限公司 | Lithium ion battery electrolyte and lithium ion secondary battery containing same |
| CN111934011A (en) * | 2020-08-14 | 2020-11-13 | 莱西市寰球新能源技术中心 | Lithium ion battery electrolyte and lithium ion battery |
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| CN111313090A (en) * | 2020-02-18 | 2020-06-19 | 白银科奥夫化学科技有限公司 | Lithium ion battery electrolyte and lithium ion secondary battery containing same |
| CN111934011A (en) * | 2020-08-14 | 2020-11-13 | 莱西市寰球新能源技术中心 | Lithium ion battery electrolyte and lithium ion battery |
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| CN114256506A (en) * | 2020-09-21 | 2022-03-29 | 合肥国轩高科动力能源有限公司 | Film-forming additive for power lithium-ion battery electrolyte and its application and battery |
| CN112289975A (en) * | 2020-10-12 | 2021-01-29 | 常州高态信息科技有限公司 | Low-temperature lithium ion battery |
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| CN116014230A (en) * | 2021-10-21 | 2023-04-25 | 张家港市国泰华荣化工新材料有限公司 | A lithium ion battery electrolyte and a lithium ion battery containing the electrolyte |
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| CN114039097B (en) * | 2021-11-29 | 2022-10-28 | 珠海冠宇电池股份有限公司 | Lithium ion battery |
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| CN116868411A (en) * | 2022-01-06 | 2023-10-10 | 宁德时代新能源科技股份有限公司 | Electrolyte, secondary battery, and electricity-using device |
| CN114566706A (en) * | 2022-01-19 | 2022-05-31 | 湖北亿纬动力有限公司 | Lithium battery electrolyte and lithium battery |
| CN115000631A (en) * | 2022-05-16 | 2022-09-02 | 万向一二三股份公司 | High-power lithium battery with long calendar life and manufacturing method thereof |
| CN116826175A (en) * | 2023-08-28 | 2023-09-29 | 如鲲(江苏)新材料科技有限公司 | Wide-temperature-range non-aqueous electrolyte, lithium ion battery, battery module, battery pack and electricity utilization device |
| CN116826175B (en) * | 2023-08-28 | 2023-11-21 | 如鲲(江苏)新材料科技有限公司 | Wide-temperature-range non-aqueous electrolyte, lithium ion battery, battery module, battery pack and electricity utilization device |
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