Ngamsai K., Arpornwichanop A., 2015, Effect of Operating Condition on Electrical Resistance and Voltage Efficiency of an Electrochemical Cell in a Vanadium Redox Flow Battery, Chemical Engineering Transactions, 45, 943-948.
Effect of electrical resistance in the electrochemical cell of a vanadium redox flow battery system on system efficiency is important. Suitable operating conditions can be determined to improve the efficiency of the system without additional cost. In this study, the effect of key parameters, such as, percent compression of fibre electrode, flow rate of electrolyte solution, current density and state of charge (SOC), on the cell electrical resistance and voltage efficiency is analyzed. The results show that the percent compression of fibre electrode and flow rate of electrolyte solution cannot be independently considered due to their coupling effect. Higher percent compression (50 %) and flow rate contribute to the lowest electrical resistance and highest voltage efficiency of the cell. The current density slightly affects the electrical resistance but significantly affects the voltage efficiency of the cell. It shows that high voltage efficiency of the cell is obtained at low current density operation. It is also found that the cell resistance is minimized when the voltage efficiency shows the highest value at 50 % SOC.
