钒
流动电池
氧化还原
电解质
无机化学
电池(电)
化学
磷酸钒锂电池
材料科学
电极
物理化学
量子力学
物理
功率(物理)
作者
Tam D. Nguyen,Adam Whitehead,Günther G. Scherer,Nyunt Wai,Moe Ohnmar Oo,Arjun Bhattarai,Ghimire P. Chandra,Zhichuan J. Xu
标识
DOI:10.1016/j.jpowsour.2016.10.017
摘要
Abstract Despite many desirable properties, the vanadium redox flow battery is limited, in the maximum operation temperature that can be continuously endured, before precipitation begins in the positive electrolyte. Many additives have been proposed to improve the thermal stability of the charged positive electrolyte. However, we have found that the apparent stability, revealed in laboratory testing, is often simply an artifact of the test method and arises from the oxidation of the additive, with corresponding partial reduction of V(V) to V(IV). This does not improve the stability of the electrolyte in an operating system. Here, we examined the oxidation of some typical organic additives with carboxyl, alcohol, and multi-functional groups, in sulfuric acid solutions containing V(V). The UV–vis measurements and titration results showed that many compounds reduced the state-of-charge (SOC) of vanadium electrolyte, for example, by 27.8, 88.5, and 81.9% with the addition of 1%wt of EDTA disodium salt, pyrogallol, and ascorbic acid, respectively. The cell cycling also indicated the effect of organic additives on the cell performance, with significant reduction in the usable charge capacity. In addition, a standard screening method for thermally stable additives was introduced, to quickly screen suitable additives for the positive vanadium electrolyte.
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