Valence Engineering via Polyoxometalate-Induced on Vanadium Centers for Efficient Aqueous Zinc-Ion Batteries.

Layered vanadium-based compounds have attracted attention as cathode materials for aqueous zinc-ion batteries (AZIBs) because of their low cost, high theoretical specific capacity, and abundant vanadium valence states. However, the slow migration of Zn ions and their poor cycling stability hinder their practical application in AZIBs. Herein, using a one-pot solvothermal method, the polyoxometalates (POMs) were inserted into the aluminum vanadate interlayer spacing, and a series of novel 3D nanoflower cathode materials (HAVO-MMo-X) were successfully fabricated.