Mitigating Capacity Decay by Adding Carbohydrate in the Negative Electrolyte of Vanadium Redox Flow Battery

Liming Chen, Tao Liu, Yimin Zhang, Hong Liu, Muqing Ding and Dong Pan
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Liming Chen: 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
Muqing Ding: 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

Energies, 2022, vol. 15, issue 7, 1-16

Abstract: Glucose, sucrose, D(+)-xylose and α-lactose monohydrate are selected as additives relative to the negative electrolyte of Vanadium Redox Flow Battery (VRFB), with the aim of reducing vanadium permeation and improving electrochemical performance to mitigate capacity decay. The results of a charge–discharge test show that the cell with α-Lactose monohydrate in the negative electrolyte exhibits the best capacity retention. The capacity retention of a single cell employing 1 wt% α-Lactose monohydrate in the negative electrolyte was 71% after 30 cycles, which is 41.5% higher than 29.5% of the control group. Correspondingly, adding α-Lactose monohydrate into the negative electrolyte also significantly inhibits vanadium crossover and water transfer. Furthermore, the effects of additives on the performance of the negative electrolyte are studied by thermal stability experiments, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The stability experiments indicate that the introduction of 1 wt% α-Lactose monohydrate can elevate the stability of the negative electrolyte at low temperatures. The electrochemical measurements indicate that V(III) electrolyte with 1 wt% α-Lactose monohydrate obtains superior electrochemical activity and reversibility, which can be ascribed to the fact that the hydroxyl group carried by the additive provides more active sites for the redox reaction. Herein, the study provides a meaningful reference for mitigating the capacity decay of VRFB.

Keywords: vanadium redox flow batteries; additive; capacity decay/retention; stability (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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