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

Abstract

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 VO2 as an example, the crystal structure and energy storage mechanism of VO2 cathode are briefly introduced. The challenges of aqueous Zn/VO2 battery are analyzed in depth. Significantly, the current advanced modification strategies for aqueous Zn/VO2 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/VO2 battery and the guiding significance for other metal ion battery.

Enhancing ammonium-ion storage in Mo-doped VO2 (B) nanobelt-bundles anode for aqueous ammonium-ion batteries

“…Vanadium-based materials have become increasingly favored by researchers compared to other anode materials due to their structurally stable and versatile properties, as well as their promising ability to store various cations. 28,29 Among these materials, VO 2 (B), which is widely recognized as one of the most popular vanadium-based materials in energy storage, exhibits significant potential as a NH 4 + host. 30 This is because it possesses desirable characteristics such as a suitable structure, applicable specific capacity, and a large lattice spacing that facilitates the insertion and extraction of NH 4 + .…”

“…, oxygen vacancy, heteroatoms doping) can manage the poor structure stability and strengthen the conductivity as well as increase active sites, and thus the overall electrochemical performance has been improved. 29,35,36 Especially, heteroatom doping has gained significant attention for improving the intrinsic electron configuration and reestablishing the balance of charge distribution. By integrating heteroatoms into the structure of VO 2 (B), the formation of a local electrical field can be optimized, thus addressing the challenges of poor conductivity and inadequate active sites.…”