High‐Entropy Layered Oxide Cathodes for Sodium‐Ion Batteries

Abstract Material innovation on high‐performance Na‐ion cathodes and the corresponding understanding of structural chemistry still remain a challenge. Herein, we report a new concept of high‐entropy strategy to design layered oxide cathodes for Na‐ion batteries. An example of layered O3‐type NaNi 0.12 Cu 0.12 Mg 0.12 Fe 0.15 Co 0.15 Mn 0.1 Ti 0.1 Sn 0.1 Sb 0.04 O 2 has been demonstrated, which exhibits the longer cycling stability (ca. 83 % of capacity retention after 500 cycles) and the outstanding rate capability (ca. 80 % of capacity retention at the rate of 5.0 C). A highly reversible phase‐transition behavior between O3 and P3 structures occurs during the charge‐discharge process, and importantly, this…

• NN
  National Natural Science Foundation of China

  Award: 51725206, 51421002
• NS
  Natural Science Foundation of Beijing Municipality

  Award: L182056
• KT
  Key Technologies Research and Development Program

  Award: 2016YFB0901500