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

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.