FeV2S4 as a high capacity electrode material for sodium-ion batteries

Abstract

Iron vanadium sulfide (FeV₂S₄) was synthesized via a high temperature solid state reaction and was investigated as a cheap anode material for Na and Li ion batteries. Discharge capacities as high as 723 mA h g⁻¹ (Na) and 890 mA h g⁻¹ (Li) were found for half-cell measurements at room temperature. The capacity of the Na–FeV₂S₄ system remained constant at 529 mA h g⁻¹ after the 10th cycle with an area capacity of 2.7 mA h cm⁻² being very close to that of conventional Li-ion technology.