Emerging Amorphous to Crystalline Conversion Chemistry in Ca‐Doped VO2 Cathodes for High‐Capacity and Long‐Term Wearable Aqueous Zinc‐Ion Batteries

Amorphous transition metal oxides have attracted significant attention in energy storage devices owing to their potentially desirable electrochemical properties caused by abundant unsaturated dangling bonds. However, the amorphization further amplifies the shortcoming of the poor intrinsic electronic conductivity of the metal oxides, resulting in unsatisfying rate capability and power density. Herein, freestanding amorphous Ca-doped V