Negative Electrolyte Modification in the All Vanadium Redox Flow Battery

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Abstract

As an excellent rechargeable energy storage battery, all vanadium redox flow battery(VRB)has the advantages of long cycle life, large capacity, small self-discharge, little pollution, and simple structure. Therefore, all vanadium redox flow battery has been widely researched at home and abroad. However, there are some problems restricting the application of all vanadium redox flow battery, for example, low vanadium ion concentration, poor stability and low electrochemical reaction rate in the electrolyte and so on. In this paper, the influence of additives on the electrochemical reaction rate of negative electrolyte for all vanadium redox flow battery has been researched by CV. It is found that the apposite concentration of urea, oxalic acid and tartaric acid can partly increase the reaction rate and electrolyte reversible, especially 0.5% oxalic. Then, the negative electrolyte adding 0.5% oxalic acid was analyzed by AC impedance and found that oxalic acid was mainly to reduce the electrochemical reaction resistance. Finally, the effect of the additives on the stability of negative electrolyte for all vanadium redox flow battery has been studied by potentiometric titration analysis. Both oxalic acid and tartaric acid can effectively improve the stability of electrolyte, and the electrolyte of 1.93 mol/L V(Ⅲ) can be stable in more than 40 days at room temperature.

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	Li Yanlong
	Wang Wei

Keywords： all vanadium redox flow battery； additive； negative electrolyte； electrochemical reaction rate； stability

Received 2013-10-09;

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Cite this article:

Li Yanlong, Wang Wei.Negative Electrolyte Modification in the All Vanadium Redox Flow Battery[J] Chemcial Industry and Engineering, 2016,V33(1): 66-70

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