Preparation of vanadium‐based electrode materials and their research progress in solid‐state flexible supercapacitors

Abstract Solid‐state flexible supercapacitors (SCs) have many advantages of high specific capacitance, excellent flexibility, fast charging and discharging, high power density, environmental friendliness, high safety, light weight, ductility, and long cycle stability. They are the ideal choice for the development of flexible energy storage technology in the future, and provide a good prospect for energy storage applications. At present, solid‐state flexible SCs are widely used for portable electronic equipment and wearable energy storage equipment, the research of them has become the focus of a growing number of researchers. Electrode material is the key part of SCs and always determines the electrochemical performance of SCs. It has been a hotspot and focus of research. Vanadium‐based compounds are considered to be a promising electrode material for SCs because of variable valence, open structure, high theoretical capacity, and low price. Therefore, this study first gives an overview of solid‐state flexible SCs, then reviews the current research status of vanadium‐based electrode materials in solid‐state flexible SCs, and proposes some strategies to solve some problems of vanadium‐based electrode materials.