FeSe2 Microspheres as a High‐Performance Anode Material for Na‐Ion Batteries

Abstract

FeSe₂ microspheres assembled by nano­octahedra are used as an anode material for Na-ion batteries for the first time, showing a high discharge capacity (447 mA h g⁻¹ at 0.1 A g⁻¹), excellent rate performance (388 mA h g⁻¹ at 5 A g⁻¹ and 226 mA h g⁻¹ at 25 A g⁻¹), and long cycling stability (372 mA h g⁻¹ after 2000 cycles at 1 A g⁻¹).