CN110247117A - A kind of electrolyte improving soft bag lithium ionic cell high-temperature behavior - Google Patents
A kind of electrolyte improving soft bag lithium ionic cell high-temperature behavior Download PDFInfo
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- CN110247117A CN110247117A CN201810196851.6A CN201810196851A CN110247117A CN 110247117 A CN110247117 A CN 110247117A CN 201810196851 A CN201810196851 A CN 201810196851A CN 110247117 A CN110247117 A CN 110247117A
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- soft bag
- ionic cell
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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
-
- 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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- 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
- H01M2300/0037—Mixture of solvents
- H01M2300/004—Three solvents
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- 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)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Primary Cells (AREA)
- Secondary Cells (AREA)
Abstract
The present invention relates to a kind of electrolyte for improving soft bag lithium ionic cell high-temperature behavior, the raw material including following composition by weight: solvent one is EC, accounts for 10%~50%；Solvent two is DEC, accounts for 20%~80%；Solvent three is PC, accounts for 5%~30%；Lithium salts is LIPF6, and content accounts for 10%~13% in 0.5~1.2mol；Additive is FEC, accounts for 1%~6%.The solvent and lithium salt is up to 99.9%.Soft bag lithium ionic cell of the invention uses new electrolyte, avoids the expansion in high temperature battery core, considerably reduces the security risk of battery.
Description
Technical field
The present invention relates to a kind of lithium ion batteries, more particularly to a kind of electricity for improving soft bag lithium ionic cell high-temperature behavior
Solve liquid.
Background technique
The performance that lithium ion battery has high voltage, high capacity, high circulation, thermal stability etc. brilliant has obtained extensive
Using.With the development of science and technology, cobalt acid lithium is limited by structural stability and price, and development voltage has reached the limit, it will
Replaced by other materials.Stratiform cobalt nickel lithium manganate ternary material has the advantages that specific capacity is high, production cost is low etc., in lithium electricity industry
Status grow steadily, it is considered to be at present be most hopeful substitute cobalt acid lithium lithium electricity positive electrode.However the heat of nickel oxide point
Solution temperature is minimum, and near 200 DEG C, and thermal discharge is most, is primarily due to the nickel (+4 valence) of high oxidation state after charging no
To stablize, oxidisability is strong, not only oxygenolysis electrolyte, corrodes collector, heat and gas are released, and itself is unstable,
Exothermic decomposition and precipitated oxygen are easy under high temperature, battery core can expand, or even cause security risk.
Summary of the invention
The object of the invention provides a kind of electrolysis for improving soft bag lithium ionic cell high-temperature behavior aiming at the above problem
Liquid.
The technical scheme adopted by the invention is that: a kind of electrolyte improving soft bag lithium ionic cell high-temperature behavior, including
The raw material of following composition by weight: solvent one is EC, accounts for 10%~50%；Solvent two is DEC, accounts for 20%~80%；Solvent three is
PC accounts for 5%~30%；Lithium salts is LIPF6, and content accounts for 10%~13% in 0.5~1.2mol；Additive is FEC, accounts for 1%~6%.
The solvent and lithium salt is up to 99.9%.
EC among the above is ethylene carbonate；PC is propene carbonate；DEC is diethyl carbonate；FEC is fluoro carbonic acid
Vinyl acetate；LIPF6For lithium hexafluoro phosphate.
Mechanism of the present invention:
(1) when pure EC makees solvent, the SEI film main component of production is lithium alkylide, and after DEC is added, the master of the SEI film of formation
Wanting ingredient is respectively alkoxy lithium and lithium carbonate.Obviously, the SEI film that the latter is formed is more stable.In the mixed system of EC/DEC,
EC is the main source for generating SEI film, and only EC decomposed, the main function of DEC be improve solution conductivity and can
Dissolubility, and the formation for participating in SEI film is not lain in, therefore after C group addition DEC, conservation rate is still significantly improved after high temperature storage.
(2) in the electrolytic solution be added PC solvent, can significantly improve under the premise of not influencing initial discharge capacity lithium from
Discharge performance of the sub- battery in high temperature.Compared with EC/DEC, a small amount of PC is added at a high temperature of 70 DEG C, the relative capacity of electric discharge
It is improved when than PC not being added and sees 16.2%, and add being basically unchanged of thickness of battery after PC.The collective effect of DEC and PC, both mentioned
The high conservation rate of high temperature storage capacity, and the stability of SEI film is improved, SEI is decomposed less at high temperature, and gas production is obvious
It reduces.
Beneficial effects of the present invention: soft bag lithium ionic cell uses new electrolyte, avoids in the swollen of high temperature battery core
It is swollen, considerably reduce the security risk of battery.
Specific embodiment
Embodiment:
A kind of electrolyte improving soft bag lithium ionic cell high-temperature behavior, the raw material including following composition by weight: solvent one
For EC, 10%~50% is accounted for；Solvent two is DEC, accounts for 20%~80%；Solvent three is PC, accounts for 5%~30%；Lithium salts is LIPF6, account for 10%
~13%；Additive is FEC, accounts for 1%~6%.Solvent and lithium salt are up to 99.9%.
The test and comparison of battery high-temperature storage performance made of electrolyte of the invention:
1 70 DEG C of subordinate list full electricity are lower to store 24H battery core thickness change
2 70 DEG C of subordinate list full electricity are lower to store 24H battery core capacity retention ratio
Mechanism: (1) when pure EC makees solvent, the SEI film main component of production is (CH2OCOOLI) 2, and after DEC is added, it is formed
The main component of SEI film be respectively C2H5COOLi and LiCO3.Obviously, the SEI film that the latter is formed is more stable.EC/DEC's
In mixed system, EC is the main source for generating SEI film, and only EC is decomposed, and the main function of DEC is to improve solution
Conductivity and solubility, and the formation for participating in SEI film is not lain in, therefore after C group addition DEC, conservation rate is still bright after high temperature storage
It is aobvious to improve.
(2) the PC solvent suitably than column is added in the electrolytic solution, can be shown under the premise of not influencing initial discharge capacity
Writing improves lithium ion battery in the discharge performance of high temperature.Compared with EC/DEC, a small amount of PC is added at a high temperature of 70 DEG C, is discharged
Relative capacity see 16.2% than improving when PC not being added, and add being basically unchanged of thickness of battery after PC.DEC's and PC is total to
Same-action, had not only improved the conservation rate of high temperature storage capacity, but also improved the stability of SEI film, at high temperature SEI decompose compared with
Few, gas production is substantially reduced.
It follows that soft bag lithium ionic cell uses new electrolyte, can effectively prevent mentioning in the expansion of high temperature battery core
High stability test, considerably reduces the security risk of battery.
Claims (2)
1. a kind of electrolyte for improving soft bag lithium ionic cell high-temperature behavior, which is characterized in that including following composition by weight
Raw material: solvent one be EC, account for 10%~50%；Solvent two is DEC, accounts for 20%~80%；Solvent three is PC, accounts for 5%~30%；Lithium salts
For LIPF6, content accounts for 10%~13% in 0.5~1.2mol；Additive is FEC, accounts for 1%~6%.
2. a kind of electrolyte for improving soft bag lithium ionic cell high-temperature behavior according to claim 1, it is characterised in that: institute
The solvent and lithium salt stated are up to 99.9%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810196851.6A CN110247117A (en) | 2018-03-10 | 2018-03-10 | A kind of electrolyte improving soft bag lithium ionic cell high-temperature behavior |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810196851.6A CN110247117A (en) | 2018-03-10 | 2018-03-10 | A kind of electrolyte improving soft bag lithium ionic cell high-temperature behavior |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110247117A true CN110247117A (en) | 2019-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810196851.6A Pending CN110247117A (en) | 2018-03-10 | 2018-03-10 | A kind of electrolyte improving soft bag lithium ionic cell high-temperature behavior |
Country Status (1)
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| CN (1) | CN110247117A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332607A (en) * | 2011-03-22 | 2012-01-25 | 东莞新能源科技有限公司 | Nonaqueous electrolyte for secondary lithium ion battery |
| CN102544586A (en) * | 2010-12-10 | 2012-07-04 | 深圳市比克电池有限公司 | Lithium ion battery preparation method and lithium ion battery |
| CN105140567A (en) * | 2015-07-31 | 2015-12-09 | 山东玉皇新能源科技有限公司 | High-voltage electrolyte for lithium-ion battery and preparation method for high-voltage electrolyte |
| KR20170038736A (en) * | 2015-09-30 | 2017-04-07 | 주식회사 엘지화학 | Non-aqueous electrolyte solution and lithium secondary battery comprising the same |
-
2018
- 2018-03-10 CN CN201810196851.6A patent/CN110247117A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102544586A (en) * | 2010-12-10 | 2012-07-04 | 深圳市比克电池有限公司 | Lithium ion battery preparation method and lithium ion battery |
| CN102332607A (en) * | 2011-03-22 | 2012-01-25 | 东莞新能源科技有限公司 | Nonaqueous electrolyte for secondary lithium ion battery |
| CN105140567A (en) * | 2015-07-31 | 2015-12-09 | 山东玉皇新能源科技有限公司 | High-voltage electrolyte for lithium-ion battery and preparation method for high-voltage electrolyte |
| KR20170038736A (en) * | 2015-09-30 | 2017-04-07 | 주식회사 엘지화학 | Non-aqueous electrolyte solution and lithium secondary battery comprising the same |
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Application publication date: 20190917 |