Performance Evaluation of Lithium Vanadium Fluorophosphate in Lithium Metal and Lithium-Ion Cells

In this study it is demonstrated that the lithium vanadium fluorophosphate, phase, offers considerable promise as a viable cathode material for commercial lithium-ion batteries. The active material was synthesized using a reaction scheme based on carbothermal reduction. The is isostructural with the known mineral ambygonite, , crystallizing with a triclinic structure (space group, ). Performance evaluation of lithium-ion cells indicates a reversible material utilization for the of around and an average discharge voltage of . Long-term cycling (C∕5 rate at ) of this lithium-ion configuration predicts a cycle life to around 90% of the original discharge capacity.