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

To improve the safety of lithium-ion batteries, cresyl diphenyl phosphate (CDP) was used as a flame retardant additive in a LiPF 6 electrolyte solution. The flammability of the electrolytes containing CDP and the electrochemical performances of the cells, LiCoO 2/Li, graphite/Li and the battery LiCo...

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Bibliographic Details
Published in:Journal of power sources 2008-10, Vol.184 (2), p.589-592
Main Authors: Zhou, Daiying, Li, Weishan, Tan, Chunlin, Zuo, Xiaoxi, Huang, Youju
Format: Article
Language:English
Subjects:
Applied sciences
Battery
Cresyl diphenyl phosphate (CDP)
Direct energy conversion and energy accumulation
Electric batteries
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrolytes
Electrolytic cells
Exact sciences and technology
Fame-retardant
Flammability
Graphite
Lithium-ion batteries
Phosphates
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Summary:To improve the safety of lithium-ion batteries, cresyl diphenyl phosphate (CDP) was used as a flame retardant additive in a LiPF 6 electrolyte solution. The flammability of the electrolytes containing CDP and the electrochemical performances of the cells, LiCoO 2/Li, graphite/Li and the battery LiCoO 2/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.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2008.03.008