Abstract
Optimizing the electrolytic composition is of practical interest to evaluate the flow battery's weatherability. In this work, the electrolytic composition is optimized for different temperature ranges according to the physicochemical characteristics of electrolyte from −30 °C to 50 °C. The solubility curves of lead methanesulfonate are obtained in methanesulfonic acid, and an equation is proposed among lead methanesulfonate's content, methanesulfonic acid's content and temperature. The conductivity and dynamic viscosity of electrolytes with different compositions can be enhanced by increasing temperature. The voltage efficiency of cell is improved with increasing temperature, but the coulombic efficiency has the maximum value around 30 °C. The high energy efficiency can be achieved by increasing the concentration of H+ below 0 °C or increasing the concentration of Pb2+ above 30 °C. The electrolytic composition of 1.5 M Pb2+ and 1.0 M H+ is suitable for the temperature range of −20 °C − 50 °C. It is also found that the concentration of H+ is demanded at least 0.17 mol/L for charging the battery.
Published Version
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