Physicochemical and Electrochemical Characterization of Vanadium Electrolyte Prepared with Different Grades of V 2 O 5 Raw Materials

Muqing Ding, Tao Liu, Yimin Zhang, Hong Liu, Dong Pan and Liming Chen
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Muqing Ding: School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Tao Liu: School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Yimin Zhang: School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Hong Liu: School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Dong Pan: School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Liming Chen: School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China

Energies, 2021, vol. 14, issue 18, 1-15

Abstract: The physicochemical and electrochemical performance of electrolytes prepared with different grades of V 2 O 5 raw materials were investigated systematically for a vanadium redox flow battery. Physicochemical tests showed that the conductivity of electrolytes prepared with lower grades of V 2 O 5 raw materials obviously decreased, while the viscosity increased. The results of electrochemical experiments showed that the electrochemical activity and reversibility of electrolytes decreased, and the solution resistance increased obviously, as the grade of V 2 O 5 raw materials gradually decreased. In addition, the battery efficiency and charge–discharge capacity were negatively affected by impurities in the lower grade V 2 O 5 raw materials, due to an increase of polarization on the charge–discharge voltage. Moreover, the performance of electrolytes was related to the total concentration of impurities in the electrolyte, and Na, K impurity ions were the main factors that adversely affected the electrochemical activity and reversibility, mass transfer, and capacity of the electrolytes. Based on the economic analysis, the impurities in V 2 O 5 raw materials would not only reduce the performance of electrolytes, but also affect the production costs of electrolytes and the economic profits. Through this fundamental research, people can better understand the influence of V 2 O 5 raw materials on electrolyte properties, and direct more attention to research how to effectively use lower grade V 2 O 5 raw materials to reduce the costs of electrolyte preparation.

Keywords: vanadium redox flow battery; electrolyte preparation; impurity ions; grade of V 2 O 5 raw materials; electrochemical performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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