Investigation of Lithium Tetrafluorooxalatophosphate as a Lithium-Ion Battery Electrolyte

A lithium tetrafluorooxalatophosphate [LiPF 4 (C 2 O 4 )] salt, was prepared and its properties as a lithium-ion battery electrolyte were investigated. The conductivity, electrochemical stability, and cycling performance of 1.0 M LiPF 4 (C 2 O 4 ) in 1:1:1 ethylene carbonate/dimethyl carbonate/diethyl carbonate are comparable to the industry standard LiPF 6 electrolyte. While the reversible capacity of the first cycle is lower than LiPF 6 -based electrolytes, the reversible cycling efficiency is equivalent. Electrochemical impedance spectroscopy and electrode surface analysis provide insight into the differences between LiPF 6 and LiPF 4 (C 2 O 4 ).

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