Highly Flexible and Adaptable, All-Solid-State Supercapacitors Based on Graphene Woven-Fabric Film Electrodes

摘要

Recently, the applications of portable and flexible devices have come to fruition, for instance, devices like flexible touch screens and flexible solar cells have become daily essentials. Such breakthroughs have dramatically stimulated the development of related technologies, such as the design and construction of energy-storage devices, one of the most important devices for human prosperity and health. Supercapacitors, which are also called electrochemical capacitors, are fast but high-power energy-storage devices. In such devices, charges are stored in the interface of electrolyte and electrode material through the rapid and reversible adsorption/ desorption of ions. Much effort has also been made to develop thin-film supercapacitors, which are expected to possess high capacity while maintaining light weight and flexibility. Theoretically, the two-dimensional (2D) extension of thin-film supercapacitors could substantially reduce the deformation resistance from the vertical direction, which ultimately would make the entire device thin, flexible, and easy to fold, twist, or reshape. The travel distance of electrolyte ions in thin-film supercapacitors is also shorter than their counterparts. Consequently, all-solid-state supercapacitors, which do not employ liquid electrolytes, have attracted tremendous attention because of their simplicity, flexibility, effi- ciency, and ease of assembly and usage.