NOVEL ELECTROLYTE FOR LITHIUM ION BATTERIES

摘要

A non-aqueous electrolyte usable in rechargeable lithium-ion batteries including a solution of LiPF₆/carbonate based electrolytes with low concentrations of LiFOP such that the thermal stability is increased compared to a standard lithium battery. A method of making lithium tetrafluorophospahte (LiF₄C₂O₄, LiFOP) including, reacting PF₅ with lithium oxalate, recrystallizing DMC/dichloromethane from a 1 : 1 mixture of to separate LiF₄OP from LiPF₆ to form a lithium salt. An electric current producing rechargeable Li-ion cell. The rechargeable lithium ion cell includes an anode, a cathode, and a non-aqueous electrolyte comprising a solution of a lithium salt in a non-aqueous organic solvent containing lithium tetrafluorooxalatophosphate (LiPF₄(C₂O₄), LiF₄OP).