镁杂质离子对钒电池电解液性能的影响  

Effect of Impurity Magnesium Ion on Electrolyte Performance of Vanadium Redox Flow Battery

作　　者：丁木清 刘涛[1,2,3,4] 张一敏[1,2,3,4,5] 黄晶[1,2,3,4] 杨亚东[1,2,3,4] 刘聪[1,2,3,4] DING Mu-qing;LIU Tao;ZHANG Yi-min;HUANG Jing;YANG Ya-dong;LIU Cong(School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China;Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan University of Science and Technology, Wuhan 480081, China;Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resources, Wuhan University of Science and Technology, Wuhan 430081, China;School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China)

机构地区：[1]武汉科技大学资源与环境工程学院,武汉430081 [2]武汉科技大学国家环境保护矿冶资源利用与污染控制重点实验室,武汉430081 [3]武汉科技大学钒资源高效利用湖北省协同创新中心,武汉430081 [4]武汉科技大学湖北省页岩钒资源高效清洁利用工程技术研究中心,武汉430081 [5]武汉理工大学资源与环境工程学院,武汉430070

出　　处：《有色金属（冶炼部分）》2018年第7期45-49,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51774216);湖北省技术创新专项重大项目(2017ACA185)

摘　　要：通过对含有不同浓度镁杂质离子的电解液进行循环伏安测试、黏度测试及热稳定性测试,考察镁离子对电解液电化学性能及稳定性的影响。结果表明,当电解液中镁杂质离子浓度超过0.96g/L时,电解液黏度从0.89mm2/s增大至0.95mm2/s,电解液中钒离子扩散系数从(2.06~3.33)×10-6 cm2/s降低至(1.30~2.11)×10-6 cm2/s,导致电极反应速率和电极反应可逆性降低;同时电解液中出现钒离子大量沉淀现象,电解液稳定性降低,严重影响钒电池的正常运行。Effect of magnesium ion on electrochemical performance and stability of electrolyte was investigated by cyclic vohammetry, viscosity test and thermal stability test of electrolyte containing different concentrations of magnesium impurity ion. The results show that with concentration of magnesium ion in electrolyte of 0. 96 g/L above, viscosity of electrolyte rises from 0. 89 mm^2/s to 0. 95 mm^2/s, diffusion coefficient of vanadium ion drops from （2.06-3.33）× 10-6 cm^2/s to （1.30-2.11） × 10^-6 cm^2/s, resulting in reduction of electrode reaction rate and reversibility of electrode reaction. In addition, precipitation of a large amount of vanadium ion in electrolyte reduces stability of electrolyte and affects normal operation of vanadium redox flow battery.

关 键 词：钒电池 电解液 镁离子 电化学性能 稳定性 

分 类 号：TM911.3[电气工程—电力电子与电力传动]