Spray‐Drying Synthesis of High‐Entropy‐Doped Na <sub>2.5</sub> Fe <sub>1.75</sub> (SO <sub>4</sub> ) <sub>3</sub> Cathodes With Enhanced Ele
Alluaudite‐type Na 2+2x Fe 2− x (SO 4 ) 3 (NFS) has attracted considerable attention as a promising cathode for sodium‐ion batteries (SIBs), owing to its cost‐effective composition and relatively high operating voltage. Nevertheless, the further practical use of NFS is still hindered by its intrinsical...