Application Of Carbon Materials In The Electrochemical Double Layer Capacitors

Super-capacitors, also known as electrochemical double-layer capacitors, are energy storage components of rapid charge and discharge. Because of its advantages of high specific capacitance and specific power, as well as longer life compared to conventional batteries, it has a broad application prospect as a new generation of energy storage devices. As a new generation of semiconductor materials, Carbon nanotubes and graphene materials have excellent electrical, mechanical, optical and other properties, besides their unique structural features all make it possible in the application in capacitors. This thesis studies the activated carbon materials, carbon nanotubes and graphene materials for super-capacitor electrode, and compares the two different electrolytes combinations of the three electrode materials and water, ion system. The main contents include the following aspects:(1) The activation of the three carbon materials; comparison of the influence of the activation process on the physical and chemical characteristics of the three materials, as well as the capacitor performance before and after the activation of carbon materials. Make it clear that the activation affects the material porosity, and porosity further affects the performance of the capacitor.(2) Comparison of three capacitor properties of carbon materials; analysis of the structural properties of different carbon materials on the capacitor performance; the calculation of basic electrical properties of the capacitance, energy density, and their comparative analysis.(3) Comparison of the two electrolytic capacitors performance. Through the analysis of cyclic voltammetry, galvanostatic charge-discharge curves and electrochemical impedance spectroscopy, it analyzes the impact of different electrolytes on the electrical properties of the capacitors.