CN101093900A - Constituents of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate - Google Patents
Constituents of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate Download PDFInfo
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- CN101093900A CN101093900A CNA2007101439177A CN200710143917A CN101093900A CN 101093900 A CN101093900 A CN 101093900A CN A2007101439177 A CNA2007101439177 A CN A2007101439177A CN 200710143917 A CN200710143917 A CN 200710143917A CN 101093900 A CN101093900 A CN 101093900A
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- electrolyte
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- ion battery
- high power
- lithium ion
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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
Abstract
The composition of electrolyte includes ethylene carbonate, carbonic allyl ester, methyl carbonate, diethyl carbonate, vinylene carbonate, 1,3 - propane sultones, and lithium phosphofluoric acid. Dissolved base solvent with higher conductivity and solvent with lower viscosity is adopted in the invention in order to guarantee both of higher conductivity and proper viscosity to better support charging and discharging high power lithium ion battery in large current. When multiplied discharging is carried out, temperature of battery steps up quickly so as to make battery generate flatulence. Thus, additive for preventing flatulence is contained in the electrolyte.
Description
Technical field
The present invention is a kind of lithium-ion battery electrolytes, and it refers to a kind of constituent of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate especially.
Background technology
At present, the low capacity lithium battery of 3C industry---the production as battery of mobile phone, cells in notebook computer etc. is tending towards saturated substantially, but jumbo power lithium-ion battery does not but still come into the market.Electric motor car and large-scale portable power source application are still plumbic acid system battery in occupation of leading position.The positive electrode of lithium ion battery is generally cobalt acid lithium, LiMn2O4 or lithium nickelate and all kinds of transition metal oxide that is doped with other element.The operating voltage of lithium ion battery is the 3.0V-4.2V scope, and rated voltage is 3.6V-3.7V, and the compatibility of electrolyte and electrode material is most important, directly influences the chemical property of battery.
At present, LiFePO 4 has safety, low cost and other advantages as a kind of new material.Because LiFePO 4 conductivity is relatively poor, as high power lithium ion cell, need to use the high power function electrolyte of supporting that lithium ion battery is used, require electrolyte to have higher ionic conductivity, and electrolyte viscosity is wanted suitably to support high current charge-discharge; Inflatable takes place in flexible-packed battery easily, needs electrolyte to have stability preferably, avoids battery when storage and multiplying power discharging inflatable to take place, and is present key subjects to be solved so solve the inflatable problem.
Summary of the invention
The invention provides a kind of constituent of lithium-ion battery electrolytes, can support better that the LiFePO 4 high power lithium ion cell carries out high current charge-discharge.And add film for additive vinylene carbonate (VC), 1, the 3-propane sultone (1,3-PS), can prevent that battery from inflatable taking place when storage or multiplying power discharging.
For realizing purpose of the present invention, this electrolyte consists of ethylene carbonate (EC), propene carbonate (PC), and dimethyl carbonate (DMC), diethyl carbonate (DEC), vinylene carbonate (VC), 1, the 3-propane sultone (1,3-PS), lithium hexafluoro phosphate (LiPF
6).The high power ferrous phosphate lithium ion battery, when carrying out multiplying power discharging, battery temperature raises very fast, be easy to make battery generation inflatable,, in electrolyte, comprise anti-inflatable additive for fear of battery generation inflatable, can effectively prevent battery generation inflatable, and when having high conductance, still can keep proper viscosity, can support better that high power lithium ion cell carries out high current charge-discharge.
Compared to prior art, the present invention has following advantage:
Have higher ionic conductivity, multiplying power discharging property is good, can carry out heavy-current discharge, has anti-inflatable function simultaneously.
Embodiment
For improving the multiplying power discharging property of LiFePO 4 high power lithium ion cell, the invention provides a kind of electrolyte of supporting high power lithium ion cell.Utilize the solvent substrate of high conductivity compatible with low viscous solvent, multiplying power discharging property is good; And add anti-inflatable additive, have anti-inflatable function simultaneously.
At first, the constituent of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate of the present invention selects the high solvent ethylene carbonate (EC) of a kind of conductivity as matrix component.Select a kind of solvent dimethyl carbonate (DMC) and matrix component to mix, and still keep high conductance after mixing.Select the lower solvent diethyl carbonate (DEC) of a kind of viscosity, and mix, make whole dicyandiamide solution keep proper viscosity, have high conductance with said components.Fluorine-containing lithium salts LiPF
6Be dissolved in above dicyandiamide solution, concentration is 0.9～1.2mol/L, and the electrolyte that the dissolving back is formed keeps high conductance (25 ± 2 ℃, greater than 11.0mS/cm) and proper viscosity.Comprise a kind of high-melting-point solvent propene carbonate (PC) in the electrolyte, and add film for additive vinylene carbonate (VC), 1, the 3-propane sultone (1,3-PS), improve the anti-inflatable performance of battery.
Wherein, ethylene carbonate (EC) content is 35～45w.t.%, propene carbonate (PC) content is 10～15w.t.%, dimethyl carbonate (DMC) content is 25～35w.t.%, diethyl carbonate (DEC) content is 15～25%, and vinylene carbonate (VC) content is 0.5～1w.t.%, 1,3-PS content is 5～10w.t.%, LiPF
6Concentration is 0.9～1.2mol/L.All above-mentioned reagent are LITHIUM BATTERY reagent, and purity is greater than 99.95%, and moisture is less than 20ppm.
Ferrous phosphate lithium ion battery is with the anti-inflatable function electrolyte of high power, is 97% of 1C discharge capacity with the 10C discharge under 25 ± 2 ℃ of room temperatures, and the 15C discharge has large current density ability preferably for 95% of 1C discharge capacity; At 85 ℃, store 4 hours, thickness change is less than 5%.
Generally, the LiFePO 4 high power lithium ion cell needs heavy-current discharge, requires used electrolyte to have higher conductivity and suitable viscosity, thereby guarantees that lithium ion can fast transferring.
The present invention adopts the base solvent with high conductance and mixes than low viscosity solvent, when it has high conductance in assurance, still can keep proper viscosity, can support better that high power lithium ion cell carries out high current charge-discharge.And when carrying out multiplying power discharging, battery temperature raises very fast, is easy to make battery generation inflatable, for fear of battery generation inflatable, comprises anti-inflatable additive in electrolyte, can effectively prevent battery generation inflatable.
Claims (10)
1, a kind of constituent of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate, it is characterized in that: electrolyte comprises ethylene carbonate, propene carbonate, dimethyl carbonate, diethyl carbonate, vinylene carbonate, 1,3-propane sultone and lithium hexafluoro phosphate.
2, the constituent of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate according to claim 1 is characterised in that: the employed anodal active component of lithium ion battery is a LiFePO 4.
3, the constituent of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate according to claim 1 is characterised in that: containing ethylene carbonate content is 35～45w.t.%.
4, the constituent of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate according to claim 1 is characterised in that: the propylene carbonate ester content is 10～15w.t.%.
5, the constituent of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate according to claim 1 is characterised in that: DMC addition is 25～35w.t.%.
6, the constituent of lithium-ion battery electrolytes according to claim 1 is characterised in that: diethyl carbonate content 15～25w.t.%.
7, the constituent of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate according to claim 1 is characterised in that: vinylene carbonate content 0.5～1.0w.t.%.
8, the constituent of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate according to claim 1 is characterised in that: 1, and 3-propane sultone content is 5～10w.t.%.
9, the constituent of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate according to claim 1 is characterised in that: the hexafluorophosphoric acid lithium concentration is 0.9～1.2mol/L.
10, the constituent of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate according to claim 1 is characterised in that: all above-mentioned constituents are all LITHIUM BATTERY reagent, and purity is greater than 99.95%, and moisture is less than 20ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101439177A CN101093900A (en) | 2007-08-14 | 2007-08-14 | Constituents of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101439177A CN101093900A (en) | 2007-08-14 | 2007-08-14 | Constituents of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate |
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| CN101093900A true CN101093900A (en) | 2007-12-26 |
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| CNA2007101439177A Pending CN101093900A (en) | 2007-08-14 | 2007-08-14 | Constituents of electrolyte of high power lithium ion battery prepared from lithium ferrous phosphate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354765A (en) * | 2011-09-22 | 2012-02-15 | 安徽金能锂电股份有限公司 | High cycle-index PLIB (polymer lithium ion battery) |
| CN106602133A (en) * | 2016-12-28 | 2017-04-26 | 中国电子科技集团公司第十八研究所 | Lithium iron phosphate battery with high specific property and preparation method thereof |
-
2007
- 2007-08-14 CN CNA2007101439177A patent/CN101093900A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354765A (en) * | 2011-09-22 | 2012-02-15 | 安徽金能锂电股份有限公司 | High cycle-index PLIB (polymer lithium ion battery) |
| CN106602133A (en) * | 2016-12-28 | 2017-04-26 | 中国电子科技集团公司第十八研究所 | Lithium iron phosphate battery with high specific property and preparation method thereof |
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