이산화망간/삼산화이철을 이용한 탄소섬유기반 섬유형 비대칭 유연 슈퍼커패시터 제조

Abstract

Fiber-shaped supercapacitors are prospective energy storage devices for wearable and flexible electronics because of their flexibility, light weight, and design versatility. However, most previously reported fiber-shaped supercapacitors suffer from low capacitances and energy density issues. The limited surface area between the two fiber electrodes and a limited operating voltage range hinder the practical application of fiber-shaped supercapacitors. Herein, we report a successful demonstration of a Swiss roll, fiber-shaped, asymmetric supercapacitor (FSASC) fabricated with MnO2 as a positive electrode and Fe2O3 as a negative electrode, both on carbon fibers as the current collector, with a high operating voltage of 2.0 V. The suggested Swiss roll FSASC device exhibited a high gravimetric energy density of 33.1 Wh kg-1 and a volumetric energy density of 0.16 mWh cm-3, with excellent rate capability, cycling stability, and coulombic efficiency. Additionally, the Swiss roll FSASC showed great durability and flexibility under mechanical stress. The promising performance of the Swiss roll FSASC suggests its potential for applications in wearable and flexible energy storage devices.