Advances of Metal Oxide Composite Cathodes for Aqueous Zinc-Ion Batteries

Abstract

Aqueous zinc-ion batteries (AZIBs) lately garner a lot of interest and are viewed as a promising energy storage technology due to their low cost, eco-friendliness, and exceptional safety. Crystal metal oxide cathode research has advanced significantly in recent years, making AZIBs a viable choice for low-cost grid storage applications. However, the readily available (Mn- and V-based oxides) electrode materials suffer from instability and low conductivity. As a consequence, extensive study efforts are dedicated into the development and evaluation of high-performance cathode systems. Herein, advanced composite cathodes with modified structures are reviewed in an attempt to increase capacity and cycle life. The Mn- and V-based composite framework with polymer template, graphene, and MXene induces electric conductivity, improved lattice spacing, and tunable characteristics, as well as possible benefits for overcoming the redox kinetics and stability constraints for AZIBs. As a result, rational modification of the metal oxides as well as the production of composites shows promise in solving problems and improving cathode performance in high-performance AZIBs.