Highly Stable Aqueous Zn‐Ion Batteries Achieved by Suppressing the Active Component Loss in Vanadium‐Based Cathode

Abstract Aqueous zinc–ion batteries (AZIBs) hold significant promise for large‐scale energy storage due to their inherent safety and environmental benefits. However, their practical application is often limited by rapid capacity loss from the dissolution of active cathode materials. Here, an effective strategy is proposed to suppress the active component loss by doping high‐valence Sn 4+ in V 3 O 7 ·H 2 O (Sn–V 3 O 7 ·H 2 O) cathode material to achieve highly stable AZIBs. An impressive capacity retention of 89.3% over 6000 cycles at 5.0 A g −1 and a high specific capacity of 408 mAh g −1 at 0.1 A g −1 are attained. The Sn 4+ doping thermodynamically lowers the formation energy of Sn–V 3 O 7 ·H 2 O and…

• NN
  National Natural Science Foundation of China

  Award: 52402279
• CP
  China Postdoctoral Science Foundation

  Award: 2024M751753
• CU
  Chulalongkorn University

  Award: N42A660383
• NR
  National Research Council of Thailand
• SK
  State Key Laboratory of Metastable Materials Science and Technology

  Award: 202401
• NK
  National Key Research and Development Program of China

  Award: 2018YFA0703602