Fast Na + Kinetics and Suppressed Voltage Hysteresis Enabled by a High‐Entropy Strategy for Sodium Oxide Cathodes

Abstract O3‐type layered transition metal cathodes are promising energy storage materials due to their sufficient sodium reservoir. However, sluggish sodium ions kinetics and large voltage hysteresis, which are generally associated with Na + diffusion properties and electrochemical phase transition reversibility, drastically minimize energy density, reduce energy efficiency, and hinder further commercialization of sodium‐ion batteries (SIBs). Here, this work proposes a high‐entropy tailoring strategy through manipulating the electronic local environment within transition metal slabs to circumvent these issues. Experimental analysis combined with theoretical calculations verify that high‐entropy metal ion…

• NN
  National Natural Science Foundation of China

  Awards: 52250191, 12104356, 52102302
• SK
  State Key Laboratory of Electrical Insulation and Power Equipment

  Award: EIPE23313