Oxygen-deficient vanadium oxides as the cathode for high-performance aqueous zinc-ion batteries

Abstract

Vanadium oxides have become highly promising cathode materials for aqueous zinc-ion batteries (AZIBs) owing to their remarkable theoretical capacities. Nevertheless, the practical application in AZIBs is hindered by poor electronic conductivity and rapid capacity decay. In this study, to overcome these shortcomings of vanadium oxides, vanadium oxides enriched with oxygen vacancies are prepared. The as-prepared electrode impressive electrochemical performance, achieving a high capacity of 410.34 mAh g⁻¹ at 0.1 A g⁻¹ and maintaining 186 mAh g⁻¹ after 8000 cycles at 10 A g⁻¹. These results highlight the excellent cycling stability and rate capability of the electrode.