Cresyl diphenyl phosphate as flame retardant additive for lithium-ion batteries

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• 作者：Daiying Zhou ; Weishan Li ; Chunlin Tan ; Xiaoxi Zuo ; Youju Huang
• 关键词：Lithium-ion batteries ; Cresyl diphenyl phosphate (CDP) ; Fame-retardant
• 刊名：Journal of Power Sources
• 出版年：2008
• 出版时间：1 October 2008
• 年：2008
• 卷：184
• 期：2
• 页码：589-592
• 全文大小：472 K

文摘

To improve the safety of lithium-ion batteries, cresyl diphenyl phosphate (CDP) was used as a flame retardant additive in a LiPF₆ electrolyte solution. The flammability of the electrolytes containing CDP and the electrochemical performances of the cells, LiCoO₂/Li, graphite/Li and the battery LiCoO₂/graphite with these electrolytes, were studied by measuring the self-extinguishing time of the electrolytes, the variation of surface temperature of the battery and the charge/discharge curve of the cells or battery. It is found that the addition of CDP to the electrolyte provides a significant suppression in the flammability of the electrolyte and an improvement in the thermal stability of battery. On the other hand, the electrochemical performances of the cells become slightly worse due to the application of CDP in the electrolyte. This alleviated trade-off between the flammability and thermal stability and cell performances provides a possibility to formulate a nonflammable electrolyte by using CDP.