Guoli Xu

Electron Spin‐State Regulation Unlocks Structural Robustness and Stable Sodium Storage in Na 4 Fe 3 (PO 4 ) 2 P 2 O 7 Cathode

ABSTRACT The low‐cost, structurally robust Na 4 Fe 3 (PO 4 ) 2 P 2 O 7 (NFPP) polyanionic cathode for sodium‐ion batteries is constrained by electronic insulation and sluggish Na + transport. Herein, a spin‐state‐engineered cathode, Na 4 Fe 2.94 Mo 0.03 Co 0.03 (PO 4 ) 2 P 2 O 7...