Preparation of high-concentration positive electrolyte of vanadium redox flow battery by activating vanadium pentoxide with highly concentrated sulfuric acid

被引：0
|
作者：
Hu C. [1 ,2 ,3 ]
Dong Y. [1 ,2 ]
Zhang W. [3 ]
Zhang H. [1 ,2 ,4 ]
Zhou P. [1 ,2 ]
Xu H. [1 ,2 ,4 ]
机构：
[1] CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing
[2] National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing
[3] Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Hebei, Qinhuangdao
[4] University of Chinese Academy of Sciences, Beijing
来源：
Huagong Xuebao/CIESC Journal | 2023年 / 74卷
关键词：
activation at elevated temperature; positive electrolyte; solubility; vanadium pentoxide; vanadium redox flow battery;
D O I：
10.11949/0438-1157.20221541
中图分类号：
学科分类号：
摘要：
Vanadium redox flow battery (VRFB) is one of the most promising chemical electric source technologies for large scale stationary energy storage. Currently, since a large share of the VRFB costs is attributed to the cost of the electrolyte, vanadium pentoxide was usually chosen as the raw materials of vanadium. However, due to the low solubility of vanadium pentoxide in sulfuric acid, the direct dissolution of vanadium pentoxide in sulfuric acid is unable to prepare an electrolyte with high vanadium concentration. In this study, pentavalent vanadium electrolyte is directly prepared from vanadium pentoxide solid by activating vanadium pentoxide with sulfuric acid at elevated temperatures. The composition, structure, and dissolution processes of the activated solid mixture are analyzed by XRD, Raman, and FT-IR. The results indicate that when the activating temperature is 180°C and the molar ratio of sulfuric acid to vanadium pentoxide of 4, the dissolution performance of vanadium pentoxide after activation is greatly enhanced, and its dissolution mass percentage is up to 98.5%. And the vanadium ion concentration can be dissolved successfully up to 3 mol·L−1. After activation, sulfuric acid and vanadium pentoxide form V2O3(SO4)2. The original structure of vanadium pentoxide is changed and the solubility of the substance is increased. At the same time, it is found that V(V) ions with high concentration will react with SO24- to produce VO2SO-4, while VO+2 in solution would also polymerize to form polymers such as V2O43+ and V2O24+ © 2023 Chemical Industry Press. All rights reserved.
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页码：338 / 345
页数：7
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