High‐Entropy Phase Stabilization Engineering Enables High‐Performance Layered Cathode for Sodium‐Ion Batteries

Abstract O3‐type layered oxides are considered as one of the most promising cathode materials for rechargeable sodium‐ion batteries (SIBs) due to their appealing energy density and feasible synthesis. Nevertheless, it undergoes complicated phase transitions and pronounced structural degradation during the cycling of charge/discharge process, rendering severe volumetric strain and poor cycling performance. Herein, a zero‐strain high‐entropy NaNi 0.2 Fe 0.2 Mn 0.35 Cu 0.05 Zn 0.1 Sn 0.1 O 2 cathode for SIBs is presented by high‐entropy phase stabilization engineering. It is verified that this low‐nickel cobalt‐free high‐entropy cathode can deliver a highly reversible phase evolution, zero volumetric strain, and…

• NN
  National Natural Science Foundation of China

  Award: 22205250
• YI
  Youth Innovation Promotion Association of the Chinese Academy of Sciences

  Award: 2021210
• NS
  Natural Science Foundation of Shandong Province

  Award: ZR202210290009
• TS
  Taishan Scholar Foundation of Shandong Province

  Award: ts201511063
• AB
  Applied Basic Research Fund of Qingdao

  Award: QDBSH20220201005