Improve the charge and discharge performance of vanadium redox flow battery by thermal spraying CNT on the surface of the positive and negative carbon materials

Abstract

The Carbon fiber electrode is a cathode material in all-vanadium flow battery. In order to further reduce the volume of the all-vanadium power storage system, further reduce the internal resistance of the carbon fiber electrode, increase the current density of the electrode, and achieve high electrical conductivity and large electrostatic capacitance are essential. Among them, the graphitization of the positive electrode material and the improvement of the specific surface area of the electrode surface also greatly affect the performance of the all-vanadium redox flow battery. Therefore, in this paper, carbon nanotubes (CNTs) with small diameter and large specific surface area are thermal plated on the surface of conventional carbon fibers, and the specific resistance can be reduced to almost half by increasing the specific surface area of the carbon fibers. The charge and discharge experiments of the all-vanadium flow battery prove that this method is very effective to improve the performance of the all-vanadium flow battery.