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

We demonstrate an economical polytetrafluoroethylene-assisted fluorination method to synthesize three binary sodium-rich fluorides NaMVF (M = Mn, Fe, and Co). The optimal NaFeVF cathode delivers a high reversible capacity of 146.5 mA h g based on active Fe/Fe and V/V redox reactions in sodium-ion batteries.