Research on the energy storage ability of coal - based nano carbon materials

Abstract

This study examines the fabrication and performance of electrodes constructed from coal-derived carbon nanotubes (CNN electrodes). These electrodes demonstrate excellent stability, maintaining 65.35% of their initial capacitance after 1000 cyclic voltammetry (CV) cycles. The specific capacitance, measured by the charge-discharge method, is 253 F/g at a current density of 0.1 A/g. Electrochemical impedance spectroscopy reveals the CNN electrodes' high conductivity, with a low charge transfer resistance (Rct) of 2.15 Ω. When assembled as anodes in lithium-ion batteries, the CNN electrodes show significant Li+ ion storage capabilities. At standard current densities of C/10 and C/20, the specific capacities are 306.0 mAh/g and 435.5 mAh/g, respectively. These results highlight the potential of coal-derived nano carbon electrodes for energy storage applications, demonstrating high stability, excellent capacitance, low resistance, and promising lithium-ion storage capability. Further research could focus on optimizing the fabrication process and exploring additional applications for these novel electrode materials.