Abstract
Carbon fiber, as an electrode material, has been widely used in all-vanadium liquid flow batteries. In order to further reduce the size of the all-vanadium storage system, it is imperative to increase the current density of the battery and to achieve high conductivity and large electrostatic capacitance. The graphitization of the electrode material and the improvement in the specific surface area of the electrode surface also greatly affect the performance of all-vanadium redox liquid flow batteries. Therefore, in this paper, carbon nanotubes (CNTs) with a small diameter and a large specific surface area were coated on the electrode surface of the VRFB system by the dispersion method to improve the cell performance. The performance of the surface-modified electrode was also verified by Raman spectroscopy, XRD and SEM surface observations and charge/discharge experiments.
Highlights
The liquid flow battery is an electrochemical energy storage technology proposed by Thaller (NASA Lewis Research Center, Cleveland, OH, USA) in 1974 [1,2]
When vanadium ions are used as the active material in the battery, called a vanadium liquid flow battery (VRFB), the vanadium electrolyte in the liquid storage tank is pressed into the battery stack through an external pump during system operation to complete the electrochemical reaction
The performance of the existing carbon felt is improved by the carbon nanotubes (CNTs) surface coating method
Summary
The liquid flow battery is an electrochemical energy storage technology proposed by Thaller (NASA Lewis Research Center, Cleveland, OH, USA) in 1974 [1,2]. The liquid flow battery is known as a battery active material renewable fuel cell [3]. When vanadium ions are used as the active material in the battery, called a vanadium liquid flow battery (VRFB), the vanadium electrolyte in the liquid storage tank is pressed into the battery stack through an external pump during system operation to complete the electrochemical reaction. V4+ in the positive electrode is oxidized to V5+ during charging, and V3+ in the negative electrode is reduced to V2+. The reverse reaction occurs during the discharge process.
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