Boosting Multielectron Reaction Stability of Sodium Vanadium Phosphate by High-Entropy Substitution

Na3V2(PO4)3 (NVP) based on the multielectron reactions between V2+ and V5+ has been considered a promising cathode for sodium-ion batteries (SIBs). However, it still suffers from unsatisfactory stability, caused by the poor reversibility of the V5+/V4+ redox couple and structure evolution. Herein, we propos a strategy that combines high-entropy substitution and electrolyte optimization to boost the reversible multielectron reactions of NVP. The high reversibility of the V5+/V4+ redox couple and crystalline structure evolution are disclosed by in situ X-ray absorption near-edge structure spectra and in situ X-ray diffraction. Meanwhile, the electrochemical reaction kinetics of high-entropy substitution NVP…

• NN
  National Natural Science Foundation of China

  Awards: 52202286, 52250710680, 22309002, 52171217
• SA
  Science and Technology Plan Project of Wenzhou, China

  Award: ZG2022032
• HF
  High-end Foreign Experts Recruitment Plan of China

  Award: G2023016009L
• BR
  Basic Research Project of Wenzhou City

  Awards: G20220016, G2023026
• NS
  Natural Science Foundation of Zhejiang Province

  Award: LY24B030006
• KR
  Key Research and Development Program of Zhejiang Province

  Award: 2023C011232