Ultralow-temperature lithium ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of poor low-temperature performance of lithium-ion batteries, and achieve the effects of reducing viscosity, improving electrical conductivity and excellent performance

Active Publication Date: 2021-06-25
TIANNENG BATTERY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The solutions disclosed in the above two patent documents, although the low-temperature performance of the battery has been improved under general low-temperature environmental conditions, still do not solve the problem of poor low-temperature performance of lithium-ion batteries under the ultra-low temperature condition of -60°C, so the development of low-temperature It is of great significance to apply lithium-ion electrolyte under the conditions of

Method used

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  • Ultralow-temperature lithium ion battery electrolyte
  • Ultralow-temperature lithium ion battery electrolyte
  • Ultralow-temperature lithium ion battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In an argon-filled glove box (H 2 O≤0.1ppm, O 2 ≤0.1ppm), weigh 50g ethylene carbonate, 250g ethyl methyl carbonate, 17.5g propylene carbonate, 25g ethylene glycol dimethyl ether and 50g ethyl acetate respectively, put them into a beaker and stir for 20min, mix well, then Slowly add 50g of lithium hexafluorophosphate, 25g of lithium difluorosulfonimide salt, 5g of lithium difluorophosphate and 5g of lithium bistrifluoromethanesulfonimide lithium salt, stir for 3 hours, completely dissolve to form a mixed solution, and then pour into the mixed solution Add 10g of vinylene carbonate and 10g of fluoroethylene carbonate respectively, stir for 20 minutes, and finally add 2.5g of lithium nitrate, stir for 60 minutes to obtain an ultra-low temperature electrolyte with a lithium salt concentration of 1mol / L.

Embodiment 2

[0028] In an argon-filled glove box (H 2 O≤0.1ppm, O 2 ≤0.1ppm), weigh 50g ethylene carbonate, 175g ethyl methyl carbonate, 17.5g propylene carbonate, 25g ethylene glycol dimethyl ether and 50g ethyl acetate respectively, put them into a beaker and stir for 20min, mix well, then Slowly add 100g lithium hexafluorophosphate, 50g lithium difluorosulfonimide salt, 5g lithium difluorophosphate and 5g lithium bistrifluoromethanesulfonylimide lithium salt, stir for 3 hours, completely dissolve to form a mixed solution, and then add Add 10g of vinylene carbonate and 10g of fluoroethylene carbonate respectively, stir for 20 minutes, and finally add 2.5g of lithium nitrate, stir for 60 minutes to obtain an ultra-low temperature electrolyte with a lithium salt concentration of 2mol / L.

Embodiment 3

[0030] In an argon-filled glove box (H 2 O≤0.1ppm, O 2 ≤0.1ppm), weigh 50g ethylene carbonate, 100g ethyl methyl carbonate, 17.5g propylene carbonate, 25g ethylene glycol dimethyl ether and 50g ethyl acetate respectively, put them into a beaker and stir for 20min, mix well, then Slowly add 150g lithium hexafluorophosphate, 65g lithium difluorosulfonimide salt, 5g lithium difluorophosphate and 5g lithium bistrifluoromethanesulfonimide lithium salt, stir for 3 hours, completely dissolve to form a mixed solution, and then pour into the mixed solution Add 10g of vinylene carbonate and 10g of fluoroethylene carbonate respectively, stir for 20 minutes, and finally add 2.5g of lithium nitrate, stir for 60 minutes to obtain an ultra-low temperature electrolyte with a lithium salt concentration of 3mol / L.

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Abstract

The invention discloses an ultralow-temperature lithium ion battery electrolyte, and belongs to the technical field of lithium ion batteries. The electrolyte comprises a solvent, a lithium salt and an additive. The solvent is a mixed solvent composed of carbonic esters, ethers and acetic esters. The lithium salt is a mixed lithium salt consisting of lithium hexafluorophosphate, lithium bis (fluorosulfonyl) imide, lithium difluorophosphate and lithium bis (trifluoromethane) sulfonyl imide. The additive is a mixed additive composed of vinylene carbonate, fluoroethylene carbonate, lithium nitrate and dichloromethane. Compared with the conventional electrolyte, the ultralow-temperature electrolyte prepared by the invention has the advantages that: the conductivity is improved by 400% or more, the interfacial film of the negative electrode of the lithium battery is effectively improved, and the polarization effect is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an ultra-low temperature lithium ion battery electrolyte. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, low self-discharge rate and no memory effect, and are widely used in various fields. Lithium-ion batteries still face many problems in practical applications, and are greatly affected by the temperature of the application environment. At present, the operating temperature range of lithium-ion batteries is -20~55°C, and in the environment of ultra-low temperature (less than -40°C), the discharge capacity, cycle performance and rate performance of lithium-ion batteries will be greatly reduced, and even serious problems will occur. The phenomenon of lithium analysis has brought great potential safety hazards. [0003] Under low temperature conditions, the performance of lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0568H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2300/0037H01M2300/004H01M2300/0042H01M2300/0091Y02E60/10
Inventor 高伟伟陈鹏张元春施璐刘红杰罗秋月宋文龙谷瑞青陈勤忠
Owner TIANNENG BATTERY GROUP
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