Title

Investigation of lithium tetrafluorooxalatophosphate [LiPF 4(C2O4)] as a lithium-ion battery electrolyte for elevated temperature performance

Document Type

Article

Date of Original Version

1-1-2010

Abstract

The thermal stability of lithium tetrafluorooxalatophosphate [LiPF 4(C2O4)] electrolyte was investigated. Although the thermal stabilities of the solid LiPF4(C2O 4) and LiPF6 were comparable, the thermal stability of the liquid LiPF4(C2 O4)/carbonate electrolyte was better than LiPF6/carbonate electrolytes. Lithium-ion cells containing LiPF4(C2 O4) electrolyte had better capacity retention than LiPF6 electrolyte containing cells upon cycling after storage at 65°C for 2 weeks. Ex situ analysis of the electrodes before and after storage at 65°C and cycling suggested that differences in the structures of the anode and cathode surface films contributed to the superior performance of cells containing LiPF4(C 2O4) electrolyte. © 2009 The Electrochemical Society.

Publication Title

Journal of the Electrochemical Society

Volume

157

Issue

1

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