Using High-Entropy Configuration Strategy to Design Na-Ion Layered Oxide Cathodes with Superior Electrochemical Performance and Thermal Stability

Na-ion layered oxide cathodes (NaxTMO2, TM = transition metal ion(s)), as an analogue of lithium layered oxide cathodes (such as LiCoO2, LiNixCoyMn1–x–yO2), have received growing attention with the development of Na-ion batteries. However, due to the larger Na+ radius and stronger Na+–Na+ electrostatic repulsion in NaO2 slabs, some undesired phase transitions are observed in NaxTMO2. Herein, we report a high-entropy configuration strategy for NaxTMO2 cathode materials, in which multicomponent TMO2 slabs with enlarged interlayer spacing help strengthen the whole skeleton structure of layered oxides through mitigating Jahn–Teller distortion, Na+/vacancy ordering, and lattice parameter changes. The strengthened…

• NN
  National Natural Science Foundation of China

  Awards: 51725206, 52122214, 52072403
• CP
  China Postdoctoral Science Foundation

  Award: 2021M703460
• YI
  Youth Innovation Promotion Association of the Chinese Academy of Sciences

  Award: 2020006