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 electr...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.展开更多
基金Projects(2006A10704003 2006Z3-D2031) supported by the Key Project of Guangdong Province and Guangzhou City, China
文摘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.
