Stabilization of Phase Transition Process and Lattice Oxygen of O3‐Layered Oxide Cathode for Sodium‐Ion Battery via Dual‐Doping Strategy

Abstract Satisfying stable cycling under high voltage and efficient ion extraction/insertion kinetics are important factors in constructing high‐energy density sodium‐ion batteries. O3‐layered oxide cathodes draw significant attention due to their high specific capacity and mature synthesis processes. However, these materials are plagued by stress accumulation from phase transitions, sluggish sodium ion diffusion kinetics, and irreversible lattice oxygen oxidation at high voltage. Herein, a Na(Ni 1/3 Fe 1/3 Mn 1/3 ) 0.98 Al 0.02 B 0.02 O 2 material is reported that addresses the inherent limitations of O3‐layered oxides under high voltage through a rationally designed dual‐element doping mechanism. Al 3 ⁺ that…

• NN
  National Natural Science Foundation of China

  Award: 22279089
• NS
  Natural Science Foundation of Tianjin City

  Award: 23JCJQJC00300