The Current Developments and Perspectives of V₂O₅ as Cathode for Rechargeable Aqueous Zinc‐Ion Batteries

Abstract

In recent years, zinc‐ion batteries (ZIBs) with near neutral (pH ≈ 4–6) Zn2+‐containing aqueous electrolyte have received extensive research due to their advantages of high safety, low production cost, suitable anode zinc, and environmental friendliness, etc. At present, one of the key challenges of aqueous ZIBs is the development of cathode materials with stable structure, rapid kinetics, and high capacity, etc. Compared with other cathode materials, V2O5 has an important potential application because of its high theoretical specific capacity (589 mA h g−1) based on two electron transfers, relatively low production cost, and suitable layered structure that facilitates zinc ion insertion/extraction. Herein, the following sections are proposed: 1) An understanding of the structure and energy storage mechanism of V2O5; 2) The recent development on the aqueous Zn/V2O5 battery from properties of V2O5 cathode and composition optimization of battery structure; 3) The application of V2O5 cathode in flexible ZIBs; and 4) The outlook and development trends in the future.

A Comprehensive Understanding of Interlayer Engineering in Layered Manganese and Vanadium Cathodes for Aqueous Zn‐Ion Batteries

“…To date, structural and morphology build, defect engineering, hybridization, pre‐intercalation, etc. numerous efforts have been developed [52] . Thereinto, the pre‐intercalation strategy is one of the most dominant strategies and will be overviewed thoroughly in the third part of this review.…”

“…numerous efforts have been developed. [52] Thereinto, the pre-intercalation strategy is one of the most dominant strategies and will be overviewed thoroughly in the third part of this review. However, except for V 2 O 5 , the layered V-based materials include hydrated and M x V 2 O 7 (M = alkali, alkaline earth, metals) compounds.…”

Recent Progress in Al‐, K‐, and Zn‐Ion Batteries: Experimental and Theoretical Viewpoints

“…Vanadium‐based composites as cathodes show excellent electrochemical performance in ZIBs. [ 67,68 ] Johnson and coworkers demonstrated a Zn/V 2 O 5 battery in a nonaqueous (0.5 M Zn(TFSI) 2 ) acetonitrile electrolyte. [ 69 ] The cell displayed initial discharge and charge capacity of 196 and 164 mAh g −1 , respectively.…”

Research Progresses and Challenges of Flexible Zinc Battery

“…ZIB, as a promising alternative to lithium ion battery, has attracted widespread attention. ( Tan et al, 2017 ; Li et al, 2019a ; Yu et al, 2019 ; Zhang et al, 2020a ).…”