Scalable synthesis of Na₂MVF₇ (M = Mn, Fe, and Co) as high-performance cathode materials for sodium-ion batteries

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Abstract

We demonstrate an economical polytetrafluoroethylene-assisted fluorination method to synthesize three binary sodium-rich fluorides Na₂MVF₇ (M = Mn, Fe, and Co). The optimal Na₂FeVF₇ cathode delivers a high reversible capacity of 146.5 mA h g-1 based on active Fe2+/Fe3+ and V3+/V4+ redox reactions in sodium-ion batteries. A steady cycling performance with a high capacity retention of 95% over 200 cycles is achieved owing to the negligible structural change during Na+ insertion/extraction.

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