K0.1v2o5 with Abundant Oxygen Defects as Cathode for Aqueous Zinc-Ion Battery

Abstract

Aqueous zinc-ion batteries (ZIBs) are anticipated to be used for grid-scale energy storage because of their low cost, abundant resources, high safety, and non-toxicity. In this study, K0.1V2O5 with abundant oxygen defects was prepared using a one-step hydrothermal reaction followed by heat treatment. According to the electrochemical test results, K0.1V2O5 shows excellent specific capacity (307.9 mAhg-1 at 0.2 Ag-1), exceptional rate capability (184.3 mAhg-1 at 10 Ag-1), and good cycling stability (88.5% capacity retention rate after 2000 cycles at 10 Ag-1). Furthermore, electrochemical kinetics revealed that the electrochemical process of the K0.1V2O5 electrode is governed by both ion diffusion and capacitive contribution, with the diffusion coefficient of Zn2+ ranging between 10-11 and 10-9 cm2 s-1. The remarkable performance revealed that K0.1V2O5 with abundant oxygen defects is a potential choice for ZIBs cathode materials.

Keywords: K0.1V2O5, Defects, cathode, Energy storage and conversion, Aqueous zinc-ion batteries