Vanadium Redox Flow Battery

The objective is to study the species transport to understand transport phenomena in the Vanadium Redox Flow Battery based on experimental measurements, and computational fluid dynamics (CFD) simulations. Furthermore, study on the system is included.

Transport phenomena in VRFB:

- The effect of flow rate of electrolyte:  The effect of the mass flow rate on the ion concentration for an all-vanadium redox flow battery (VFB) system was examined to determine the optimal operating strategy. As dimensionless parameters, the stoichiometric number and state of charge (SOC) were used to apply the strategy to all scales of the VFB system. In this study, we developed a transient model for this system, which is supported by experimental data, to analyze its responses and determine its optimal operating conditions.

- The effect of flow rate of electrolyte:  This study investigated species transfer through the Nafion® 212 for the all vanadium redox flow battery (VFB) to understand transport phenomena associate with capacity loss. By considering several driving forces related to transfer of vanadium ions, proton, and water molecules, we examined the variation of ion concentration during self-discharge, charge and discharge, and long-term operation.

- Porous Electrode design: The effect of local porosity of electrode on the flow distribution of electrolyte was examined to design optimal electrode as channel for electrolyte. We tried to increase the power density of the all-vanadium redox flow battery (VFB) system by controlling the porosity of the electrolyte inlet and outlet. In this study, we suggested three different electrode design, and conducted experiments to obtain efficiencies at high current density. The flow field of electrolyte according to different electrode design is analyzed by CFD program.