Ultrafast Preparation of High‐Entropy NASICON Cathode Enables Stabilized Multielectron Redox and Wide‐Temperature (−50–60 °C) Workability in Sodium‐Ion Batteries

Abstract Avoiding severe structural distortion, irreversible phase transition, and realizing the stabilized multielectron redox are vital for promoting the development of high‐performance NASICON‐type cathode materials for sodium‐ion batteries (SIBs). Herein, a high‐entropy Na 3.45 V 0.4 Fe 0.4 Ti 0.4 Mn 0.45 Cr 0.35 (PO 4 ) 3 (HE‐Na 3.45 TMP) cathode material is prepared by ultrafast high‐temperature shock, which inhibits the possibility of phase separation and achieves reversible and stable multielectron transfer of 2.4/2.8 e − at voltage range of 2.0–4.45/1.5–4.45 V versus Na + /Na (the capacity of 137.2/162.0 mAh g −1 ). The galvanostatic charge/discharge and in‐situ X‐ray diffraction tests indicate the…

• NN
  National Natural Science Foundation of China

  Award: 52102213
• PG
  People's Government of Jilin Province

  Award: 20220502002GH
• NK
  National Key Research and Development Program of China

  Award: 2023YFE0202000