A new electrolyte based on fluorinated solvents was studied in a high voltage Li-ion cell using graphite as the anode and 5 V spinel LiNi0.5Mn1.5O4 as the cathode. The electrolyte shows significantly enhanced voltage stability compared with the conventional electrolytes at elevated temperature (55 oC). Post-test study of the harvested cathode using FT-IR and SEM indicated that the buildup of organic decomposition product on the cathode surface previously observed with the conventional electrolyte is negligible for the fluorinated electrolyte. Additionally, the non-flammability of this fluorinated electrolyte will render improved safety of the Li-ion battery under abusive conditions.

High voltage electrolyte based on fluorinated compounds for 5V Li-ion chemistry

246th National Meeting (2013)

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