2D V10O24·nH2O sheets as a high-performance cathode material for aqueous zinc-ion batteries

Abstract

In this work, 2D V10O24·nH2O sheets are synthesized via a facile solvothermal method. When used as a cathode material for aqueous rechargeable zinc ion batteries (ZIBs), the as-prepared V10O24·nH2O sheets show high reversible capacity (408 mA h g−1 at 0.1 A g−1), superior long-term cyclability (with a stable capacity of 314 mA h g−1 over 1000 cycles at 2.0 A g−1), as well as excellent rate performance. The impressive electrochemical performance can be attributed to the 2D morphology composed of staked nanosheets and the existence of V4+, which enhances the structural stability, promotes the electrochemical activity and improves the reaction kinetics as demonstrated by electrochemical tests and ex-situ characterizations. This study provides a viable and promising cathode material for practical ZIBs.