Effect of Composite Additives on Positive Catholyte Electrolyte Performance of Vanadium Redox Flow Battery

化学工业与工程

Chemcial Industry and Engineering

2020, Vol. 37

Issue (5) :46-52 DOI: 10.13353/j.issn.1004.9533.20191941

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Effect of Composite Additives on Positive Catholyte Electrolyte Performance of Vanadium Redox Flow Battery

Li Linbo^1,2, Guo Pan¹, Ren Junquan¹, Luo Shuai¹

1. School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. Metallurgical Engineering Technology Research Center of Shaanxi Province, Xi'an 710055, China

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Abstract In order to improve the electrolyte performance of vanadium redox flow battery, three composite additives were selected to investigate their effect on the stability and electrochemical properties systematically. The vanadium redox flow battery electrolyte of 2 mol/L pentavalent vanadium solution was prepared by electrochemical technology, with the ratio of composite additives was acquired by critical micelle concentration method: 1% KHSO₄+3 mmol/L SDBS(sodium dodecyl benzene sulfonate), 1% KHSO₄+2 mmol/L D-sorbitol, 1% KHSO₄+2 mmol/L CTAB(cetyl trimethyl ammonium bromide). The effect of those composite additives on the stability and electrochemical properties of electrolyte were studied. The chemical composition of the electrolyte precipitate was characterized by XRD analysis. The results show that additives cannot cause the valence transition of vanadium ions. After adding 1% KHSO₄+2 mmol/L CTAB, the difference of peak potential for electrolyte decreases by 12 mV while the peak current increases by 9.8 mA, which indicates that the stability and reversibility of the electrolyte are improved by the addition of CTAB+KHSO₄ with optimized ratio. The phase composition of the electrolyte precipitate is not changed and the electrolyte performance is significantly improved by the addition of CTAB+KHSO₄.

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	Li Linbo
	Guo Pan
	Ren Junquan
	Luo Shuai

Keywords： vanadium redox flow battery； electrolyte； composite additives； stability； electrochemical performance

Received 2019-12-11;

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Li Linbo, Guo Pan, Ren Junquan, Luo Shuai.Effect of Composite Additives on Positive Catholyte Electrolyte Performance of Vanadium Redox Flow Battery[J] Chemcial Industry and Engineering, 2020,V37(5): 46-52

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