Synergistic Modulation of Electronic Structure and Sodium‐Ion Diffusion in Iron Sulfides via High‐Entropy Doping for High Performance Sodium‐Ion Batteries

Abstract Iron sulfides are promising anode materials for high‐energy‐density sodium‐ion batteries (SIBs) due to their high theoretical capacity, exceptional safety features, and abundant resources. However, their practical application is limited by limited intrinsic electronic conductivity, low sodium ion diffusion rates, and rapid capacity degradation. A novel high‐entropy doping strategy is developed using a scalable ball‐milling method to form a solid solution of doped elements (cation dopants: Ni, Mo, Cr, W, and Si; anion dopant: Se) with the primary components (iron and sulfur). Simultaneously, expanded graphite (EG) is incorporated and exfoliated through ball milling to provide abundant active sites for…

• NN
  National Natural Science Foundation of China

  Award: 22271066