Layered hydrated vanadium oxide as highly reversible intercalation cathode for aqueous Zn‐ion batteries

Carbon Energy

Xiaodong Shi¹  Zhuoxi Wu¹  Jiang Zhou¹  Shuquan Liang¹  Pinji Wang¹  Shan Guo¹ 

[1] School of Materials Science and Engineering Central South University Changsha Hunan China;

关键词: cut‐off voltage;    hydrated vanadium oxide;    layered structure;    zinc storage mechanism;    Zn‐ion battery;   

DOI  :  10.1002/cey2.39

来源: DOAJ

【 摘 要 】

Abstract Aqueous Zn‐ion batteries (ZIBs) hold great potential in large‐scale energy storage systems due to the merits of low‐cost and high safety. However, the unstable structure of cathode materials and sluggish (de)intercalation kinetics of Zn2+ pose challenges for further development. Herein, highly reversible aqueous ZIBs are constructed with layered hydrated vanadium oxide as a cathode material. The electrochemical performances are further tested with the optimized electrolyte of 3M Zn(CF3SO3)2 and a cut‐off voltage of 0.4 to 1.3 V, exhibiting a remarkable capacity of 290 mAh g−1 at 0.5 A g−1, and long‐term cycling stability at high current density. Furthermore, the Zn2+ storage mechanism of V3O7⋅H2O is recognized as a highly reversible (de)intercalation process with good structural stability, implying the potential application in the field of large‐scale energy storage.

【 授权许可】

Unknown