A supercapacitor Based on Graphite Paper

Abstract

As a new energy storage device, supercapacitor (SC) has attracted much attention because of its advantages like long service life, high power, and environmental protection. In the study of SCs, Polyaniline (PANI) has attracted great attention because of its high conductivity and good stability. But the working voltage of PANI based electrode is low (≤0.8V) as it usually gets crushed under higher voltage. Therefore, slowing down the crushing of PANI and increasing the working voltage of PANI based SC has been urged for the performance improvement of this kind of SC. Despite many previous attempts, the performance has not been significantly improved. In this research, the performance has been effectively improved by introducing MnO2 and quasi-solid electrolyte into electrode system, where Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and battery test system have been conducted. The specific capacitance was increased by 30% in 1000 cycle times and the working voltage was doubled. Meanwhile, the lead-in of graphite paper (GP) and quasi-solid electrolyte make SC flexible and thinner, which improve the wearability of devices.