A high wettability flame retardant electrolyte

An electrolyte and additive technology, which is applied in the field of high-wetting flame-retardant electrolyte, can solve the problems of limiting the power density of lithium batteries, increasing the internal resistance of batteries, and affecting the rate discharge performance of lithium batteries, so as to avoid adverse effects and reduce internal resistance of batteries , to meet the effect of normal charging and discharging

Active Publication Date: 2022-01-28
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding flame retardants to the electrolyte can effectively improve the safety of lithium-ion batteries, but the introduction of flame retardants often increases the internal resistance of the battery, affects the rate discharge performance of lithium batteries, and limits the power density of lithium batteries

Method used

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  • A high wettability flame retardant electrolyte
  • A high wettability flame retardant electrolyte
  • A high wettability flame retardant electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A high-wetting flame-retardant electrolyte formula, including the following raw materials by weight: ethylene carbonate 30 g, diethyl carbonate 20 g, methyl ethyl carbonate 50 g, F127 0.5 g, fluoroethylene carbonate 5 g, ethylene carbonate Vinyl ester 2 g, acetamide 3 g, ethoxypentafluorocyclotriphosphazene 5 g, lithium difluorooxalate borate 2 g, lithium bisfluorosulfonyl imide 2 g, lithium bistrifluoromethylsulfonyl imide 1g, lithium hexafluorophosphate 15g.

Embodiment 2

[0038] A high-wetting flame-retardant electrolyte formula, including the following raw materials: ethylene carbonate 25 g, diethyl carbonate 20 g, methyl ethyl carbonate 50 g, F127 0.3 g, ethyl propionate 5 g, F127 0.3 g, Fluoroethylene carbonate 5 g, vinylene carbonate 2 g, acetamide 2 g, ethoxypentafluorocyclotriphosphazene 5 g, difluorooxalate lithium borate 1 g, bisfluorosulfonimide lithium 2 g, Lithium hexafluorophosphate 15 g.

Embodiment 3

[0040] A high-wetting flame-retardant electrolyte formula, including the following raw materials by weight: ethylene carbonate 30 g, diethyl carbonate 20 g, methyl ethyl carbonate 50 g, ethyl propionate 10 g, F127 0.3 g, fluoroethylene carbonate 10 g ester, 2 g vinylene carbonate, 5 g acetamide, 8 g ethoxypentafluorocyclotriphosphazene, 1 g lithium difluorooxalate borate, 2 g lithium bistrifluoromethanesulfonimide, lithium hexafluorophosphate 15 g.

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Abstract

The invention provides a highly wettable flame-retardant electrolyte, including additives, solvents and lithium salts, the additives include polypropylene glycol and ethylene oxide addition polymer (F127), fluoroethylene carbonate, vinylene carbonate, Acetamide, fluoroorganolithium salt, and ethoxypentafluorocyclotriphosphazene. The invention realizes that the electrolyte is non-combustible under an open flame state, and uses polypropylene glycol and ethylene oxide addition polymer (F127) as the electrolyte wetting agent. In order to prevent the flame retardant additive from affecting the electrochemical performance of the battery, film-forming additives and conductive additives were used to optimize the electrolyte system. The optimized electrolyte showed extremely high safety and electrochemical performance.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a highly wettable flame-retardant electrolyte. Background technique [0002] Fuel vehicles have brought enormous environmental pressure to cities. Lithium batteries are light in weight, long in life, and small in size, quickly occupying the field of new energy vehicles. However, since lithium is an active metal, it is easy to burn and explode when it meets water and air, and there is no effective fire extinguishing method. In recent years, spontaneous combustion and explosion incidents of lithium batteries have occurred frequently, especially as a power battery, under the condition of high current discharge, due to its own internal resistance, the thermal runaway of lithium batteries has resulted in safety accidents. Therefore, the safety of lithium batteries has received more and more attention and has become one of the important factors restricting the development of the new e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0567H01M4/0416H01M4/0407H01M2300/0025H01M2300/002H01M2200/00Y02E60/10
Inventor 刘艳侠王恩阳刘景博秦盼盼赵冲冲
Owner 郑州中科新兴产业技术研究院
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