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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Performance of electrolyte with dimethyl methyl phosphonate as flame-retardant additive
ZHOU Dai-ying(周代营)1, LIU Jian-sheng(刘建生)2, 3, LI Wei-shan(李伟善)1,
TAN Chun-lin(谭春林)1, XU Meng-qing(许梦清)2, ZHAO Ling-zhi(赵灵

1. Department of Chemistry, South China Normal University, Guangzhou 510006, China;
2. College of Materials Science and Engineering, South China University of Technology,
Guangzhou 510641, China;
3. Guangzhou Tinci High New Material Technology Trade Co. Ltd., Guangzhou 510600, China

Abstract:To improve the safety of lithium-ion batteries, dimethyl methyl phosphonate(DMMP) was used as a flame-retardant additive in a LiPF6 electrolyte solution. The flammability and thermal stability of DMMP-containing electrolyte was investigated by means of burning test and accelerating rate calorimeter. It was found that the flammability and self-heat rate of the electrolyte can be reduced by the addition of DMMP. On the other hand, the electrochemical performances of graphite/LiCoO2 cells become slightly worse after using DMMP additive in the electrolyte. This alleviated trade-off between electrolyte flammability, thermal stability, and cell performance provides a possibility to formulate a nonflammable electrolyte containing DMMP and improve the electrolyte thermal stability with a minimal sacrifice in performance.

 

Key words: lithium ion batteries; dimethyl methyl phosphonate(DMMP); fame-retardant

ISSN 1672-7029
CN 43-1423/U

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