High-Performance Flexible Asymmetric Supercapacitor of Carbon Fiber Hybrid Composites with Carbon Nanosphere and Nanostructured MnO2

Abstract

High-performance electrical energy storage devices are in high demand due to developments in eco-friendly energy production. Due to their high electrical density, quick charge/discharge rate, and electrochemical stability, supercapacitors are gaining attention. Because of their light weight, high electrical conductivity, high flexibility, low internal resistance, and ease of processing, polyacrylonitrile (PAN) based carbon fabrics are becoming a new level of electrodes for supercapacitor electrodes. Due of its distinct stiffness, chemical resistance, and flexibility, it is utilized in many different sectors. Also, its excellent electrical conductivity and low internal resistance, it can be employed as an energy storage device. However, a significant obstacle to this is the low specific surface area. Mesoporous carbon nanospheres (CNS), which have low resistance and high conductivity, have a wide range of applications. At PAN surface, CNS is produced using a straightforward thermal carbonization technique with PVDF (Polyvinylidene Fluoride). It degrades at or just above 300oC and carbonizes at or just above 700oC with developing hydrofluoric acid (HF) in an inert environment. The CNS originated from PVDF increases surface area and conductivity, making it a suitable candidate for use as a supercapacitor material. In this work, the CNS was created by giving variation of wettability levels while applying a layer of dimethylformamide solution to the surface of the carbon fabric coated and finally generating CNS as a function of temperatures in an inert environment. This substrate was undergoing MnO2 anodic deposition at the surface with the ideal temperature to create an asymmetric supercapacitor. As a result, the asymmetric supercapacitor's operating voltage area could be enlarged. Additionally, Polypyrrole was covered at CNS carbon fabric utilizing to raise operating voltage. Finally, we successfully created a supercapacitor device by employing these active materials without using binder. This device emitted red LED for several minutes without any current collector. These active materials suggest new type of active materials.