Cross channel between ordinary supercapacitors and flexible supercapacitors - A flexible supercapacitor based on carbon fiber felt framework

Due to the requirement for wearability and the limitation of flexibility, as well as the lack of materials with both conductive, flexible, and energy storage functions, the structure of flexible supercapacitors is often presented in a two-dimensional plane form. Consequently, the thickness is limited, resulting in low capacity. In order to address this issue, a new approach has been attempted here. By utilizing 1 mm flexible carbon fiber felt as a conductive framework and mechanical support, a certain amount of acetylene black and activated carbon are filled and cured to fully leverage the characteristics of carbon fiber felt for significantly enhancing capacity while meeting performance requirements for flexible supercapacitors. The resulting flexible supercapacitor exhibits high strength, large capacity (1.5Fcm −2 ), good responsiveness, as well as excellent flexibility and magnification performance. Additionally, by using the thickness of carbon fiber felt to increase the thickness of the supercapacitor and changing its shape from the sheet to block accordingly allows for corresponding increases in capacitance and volume. This transformation seems to demonstrate that carbon fiber felt may serve as a framework bridging conventional supercapacitors with flexible ones while transitioning from planar structures to three-dimensional ones.