CN109473720A - A kind of lithium-ion battery electrolytes - Google Patents
A kind of lithium-ion battery electrolytes Download PDFInfo
- Publication number
- CN109473720A CN109473720A CN201811297109.0A CN201811297109A CN109473720A CN 109473720 A CN109473720 A CN 109473720A CN 201811297109 A CN201811297109 A CN 201811297109A CN 109473720 A CN109473720 A CN 109473720A
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- Prior art keywords
- lithium
- ion battery
- additive
- carbonate
- follows
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Classifications
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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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Secondary Cells (AREA)
Abstract
The present invention relates to the technical field of electrolyte of lithium ion battery, more particularly to a kind of lithium-ion battery electrolytes for promoting cycle performance of lithium ion battery, the lithium-ion battery electrolytes include: electrolyte and the additive in electrolyte, the additive are as follows: fluoroacetic vinyl acetate, and the weight percent of the additive in the electrolytic solution are as follows: 0.1%~5%.Since fluorine element can sufficiently promote the compactness and electric conductivity of SEI film, so, additive present invention employs fluoroacetic vinyl acetate (FVA) as electrolyte, its SEI film that can not only form excellent effect, it can be found that the additive has good facilitation to cycle performance under high voltage condition in experiment, to promote the cycle performance of lithium ion battery.
Description
Technical field:
The present invention relates to the technical field of electrolyte of lithium ion battery more particularly to a kind of promotion lithium ion battery cyclicity
The lithium-ion battery electrolytes of energy.
Background technique:
In order to improve the performance of lithium ion battery, research staff can attempt to add ceaselessly additive in the electrolytic solution.Mesh
Before, there is research staff to apply vinyl acetate in lithium-ion battery electrolytes, the electricity with conventional addition vinylene carbonate
It solves liquid and carries out cycle performance comparison expression, impedance can be reduced using vinyl acetate.But in macrocyclic contrast test, add
The electrolyte of vinyl acetate is added not show the excellent properties of vinylene carbonate.The present inventor is right in response to this
This electrolysis additive of vinyl acetate improves, and proposes following technical scheme.
Summary of the invention:
The technical problems to be solved by the invention are exactly to overcome the deficiencies of the prior art and provide one kind lithium-ion electric can be improved
The lithium-ion battery electrolytes of pond cycle performance.
In order to solve the above technical problems, present invention employs the following technical solutions: a kind of lithium-ion battery electrolytes, packet
It includes: electrolyte and the additive in electrolyte, the additive are as follows: fluoroacetic vinyl acetate, and the additive exists
Weight percent in electrolyte are as follows: 0.1%~5%.
Furthermore, in above-mentioned technical proposal, in the fluoroacetic ethylene ester molecule, the substitution quantity of fluorine element
Control is within 5.
Furthermore, in above-mentioned technical proposal, height electricity of the lithium-ion battery electrolytes for voltage within 4.5V
In the lithium ion battery of piezoelectric battery circulating system.
Furthermore, in above-mentioned technical proposal, the electrolyte includes: organic solvent and the lithium for being dissolved in organic solvent
Salt；The organic solvent are as follows: ethylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, propene carbonate, carbon
Sour first propyl ester, butylene, ethyl acetate, any one or two kinds in propylene acetate and two or more any than column
Combination；The lithium salts are as follows: lithium hexafluoro phosphate, LiBF4, di-oxalate lithium borate, difluorine oxalic acid boracic acid lithium, hexafluoroarsenate
One of lithium, lithium perchlorate, trifluoromethyl sulfonic acid lithium, lithium iodide or combination, concentration in the electrolytic solution is 0.8~
1.5mo1/L。
The electrolyte made through the above technical solution is added to a certain amount of fluoroacetic vinyl acetate in the electrolytic solution.
The principle of the present invention are as follows: since vinyl acetate can form SEI film in negative terminal surface, but with addition vinylene carbonate
(VC), the electrolyte of fluorinated ethylene carbonate (FEC), which is compared, is not achieved ideal effect.Meanwhile present inventor considered that fluorine is first
Element can sufficiently promote the compactness and electric conductivity of SEI film, so, present invention employs fluoroacetic vinyl acetate (FVA) conducts
The additive of electrolyte, can not only form the SEI film of excellent effect, it can be found that the additive is to high voltage item in experiment
Cycle performance has good facilitation under part, to promote the cycle performance of lithium ion battery.
Specific embodiment:
The electrolyte of lithium ion battery of the present invention include: organic solvent, the lithium salts being dissolved in organic solvent and
Additive.
Organic solvent are as follows: ethylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, propene carbonate, carbon
Any one in sour first propyl ester, butylene, ethyl acetate, propylene acetate or other electrolyte or two kinds and two kinds
Combination of any of the above than column.It is preferred that: ethylene carbonate (EC)/methyl ethyl carbonate (EMC)/dimethyl carbonate (DMC) three
Mixture, wherein the mass ratio of three is 1/1/1.
The lithium salts are as follows: lithium hexafluoro phosphate, LiBF4, di-oxalate lithium borate, difluorine oxalic acid boracic acid lithium, hexafluoro arsenic
One of sour lithium, lithium perchlorate, trifluoromethyl sulfonic acid lithium, lithium iodide or combination.It is preferred that lithium hexafluoro phosphate, in the electrolytic solution
Concentration be 0.8~1.5mo1/L.
The additive are as follows: fluoroacetic vinyl acetate, and the weight percent of the additive in the electrolytic solution are as follows:
0.1%~5%.Specifically, the substitution quantity of fluorine element controls within 5 in the fluoroacetic ethylene ester molecule.
Comparative example 1
Lithium salts uses LiPF6, the concentration of lithium salts is 1.0mol/L
Solvent using ethylene carbonate, methyl ethyl carbonate, dimethyl carbonate three mixture, the wherein mass ratio of three
For 1:1:1.
Additive uses vinylene carbonate (VC), weight percent in the electrolytic solution are as follows: 1%.
Comparative example 2
Lithium salts uses LiPF6, the concentration of lithium salts is 1.0mol/L
Solvent using ethylene carbonate, methyl ethyl carbonate, dimethyl carbonate three mixture, the wherein mass ratio of three
For 1:1:1.
Additive uses vinyl acetate (VA), weight percent in the electrolytic solution are as follows: 1%.
Embodiment 1:
Lithium salts uses LiPF6, the concentration of lithium salts is 1.0mol/L
Solvent using ethylene carbonate, methyl ethyl carbonate, dimethyl carbonate three mixture, the wherein mass ratio of three
For 1:1:1.
Additive uses fluoroacetic vinyl acetate (FVA), weight percent in the electrolytic solution are as follows: 1%.
Embodiment 2:
Lithium salts uses LiPF6, the concentration of lithium salts is 1.0mol/L
Solvent using ethylene carbonate, methyl ethyl carbonate, dimethyl carbonate three mixture, the wherein mass ratio of three
For 1:1:1.
Additive uses fluoroacetic vinyl acetate (FVA), weight percent in the electrolytic solution are as follows: 2%.
Electrolyte is prepared according to the formula of above-mentioned comparative example, embodiment, after testing according to battery testing technique after qualification
It is required that carrying out the test such as recycling.Wherein, test environment compares 300 weeks in high-voltage battery circulating system of the voltage within 4.5V
Variation, the coherent detection data such as the later battery capacity conservation rate of secondary circulation, internal resistance, thickness are as follows:
| Capacity retention ratio | Internal resistance increase rate | Thickness increment rate (cold survey) | |
| Comparative example 1 | 87.2% | 2.5% | 3.4% |
| Comparative example 2 | 82.6 | 5.6% | 7.2% |
| Embodiment 1 | 88.4% | 2.1% | 2.8% |
| Embodiment 2 | 88.7% | 2.2% | 2.6% |
By the charge-discharge performance test data explanation of the battery of embodiment and comparative example each in table, prepared by the present invention
Electrolyte cycle performance be substantially better than the battery prepared by comparative example electrolyte.
Certainly, described above is only the embodiment of the present invention, be not to limit the scope of the invention, it is all according to the present invention
The equivalent change or modification that structure, feature and principle described in claim is done, it is special to should be included in the present patent application
In sharp range.
Claims (4)
1. a kind of lithium-ion battery electrolytes, comprising: electrolyte and make an addition to additive in electrolyte, it is characterised in that:
The additive are as follows: fluoroacetic vinyl acetate, and the weight percent of the additive in the electrolytic solution are as follows: 0.1%~
5%.
2. a kind of lithium-ion battery electrolytes according to claim 1, it is characterised in that: the fluoroacetic vinyl acetate
In, the substitution quantity of fluorine element controls within 5.
3. a kind of lithium-ion battery electrolytes according to claim 1, it is characterised in that: the lithium-ion battery electrolytes are used
In voltage in the lithium ion battery of the high-voltage battery circulating system within 4.5V.
4. a kind of lithium-ion battery electrolytes described in any one of -3 according to claim 1, it is characterised in that: the electricity
Solving liquid includes: organic solvent and the lithium salts for being dissolved in organic solvent；
The organic solvent are as follows: ethylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, propene carbonate,
Methyl propyl carbonate, butylene, ethyl acetate, any one or two kinds in propylene acetate and two or more any than column
Combination；
The lithium salts are as follows: lithium hexafluoro phosphate, LiBF4, di-oxalate lithium borate, difluorine oxalic acid boracic acid lithium, hexafluoroarsenate
One of lithium, lithium perchlorate, trifluoromethyl sulfonic acid lithium, lithium iodide or combination, concentration in the electrolytic solution is 0.8~
1.5mo1/L。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811297109.0A CN109473720A (en) | 2018-11-01 | 2018-11-01 | A kind of lithium-ion battery electrolytes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811297109.0A CN109473720A (en) | 2018-11-01 | 2018-11-01 | A kind of lithium-ion battery electrolytes |
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| Publication Number | Publication Date |
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| CN109473720A true CN109473720A (en) | 2019-03-15 |
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| CN201811297109.0A Pending CN109473720A (en) | 2018-11-01 | 2018-11-01 | A kind of lithium-ion battery electrolytes |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005174945A (en) * | 2005-01-07 | 2005-06-30 | Ube Ind Ltd | Nonaqueous electrolyte for lithium secondary battery, and nonaqueous electrolyte secondary battery |
| CN102598389A (en) * | 2009-06-24 | 2012-07-18 | 丰田自动车工程及制造北美公司 | High voltage electrolyte |
| CN103765659A (en) * | 2011-09-02 | 2014-04-30 | 纳幕尔杜邦公司 | Lithium ion battery |
| CN111656595A (en) * | 2018-01-30 | 2020-09-11 | 大金工业株式会社 | Electrolyte solution, electrochemical device, lithium ion secondary battery, and assembly |
-
2018
- 2018-11-01 CN CN201811297109.0A patent/CN109473720A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005174945A (en) * | 2005-01-07 | 2005-06-30 | Ube Ind Ltd | Nonaqueous electrolyte for lithium secondary battery, and nonaqueous electrolyte secondary battery |
| CN102598389A (en) * | 2009-06-24 | 2012-07-18 | 丰田自动车工程及制造北美公司 | High voltage electrolyte |
| CN103765659A (en) * | 2011-09-02 | 2014-04-30 | 纳幕尔杜邦公司 | Lithium ion battery |
| CN111656595A (en) * | 2018-01-30 | 2020-09-11 | 大金工业株式会社 | Electrolyte solution, electrochemical device, lithium ion secondary battery, and assembly |
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Application publication date: 20190315 |
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