Current Challenges and Advanced Design Strategy of Vanadium Dioxide Cathode for Low‐Cost Aqueous Zinc Metal Battery

Rechargeable aqueous zinc metal battery has been one of the next‐generation energy storage systems with a promising future due to the advantages of aqueous electrolyte and metallic zinc anode. Among many cathode materials, vanadium‐based materials with considerable specific capacity, adjustable crystal structure, and multiple valence states are very promising cathodes, but the electrochemical performance of vanadium‐based zinc metal batteries faces severe challenges such as the limited and declining capacity and sluggish ion/e − transport kinetics process. Herein, taking VO 2 as an example, the crystal structure and energy storage mechanism of VO 2 cathode are briefly introduced. The challenges of aqueous Zn/VO 2 battery are analyzed in depth. Significantly, the current advanced modification strategies for aqueous Zn/VO 2 battery are summarized and discussed in detail, and the future development is also prospected. This article can provide some significant references for the development of aqueous Zn/VO 2 battery and the guiding significance for other metal ion battery.