钒电池负极SOC测定用参比电极的电位稳定性  

Potential stability of reference electrodes for SOC measurement of negative electrolyte in vanadium battery

作　　者：王熙俊 张秀丽 孙贵 WANG Xi-jun;ZHANG Xiu-li;SUN Gui(Electric Power Research Institute,North China State Grid Jibei Electric Power Co.,Ltd.,North China Electric Power Research Institute Co.,Ltd.,Beijing 100045,China;State Electric Power Jiuquan Power Generation Co.,Ltd.,Jiuquan Gansu 735000,China)

机构地区：[1]国网冀北电力有限公司电力科学研究院(华北电力科学研究院有限责任公司),北京100045 [2]国电电力酒泉发电有限公司,甘肃酒泉735000

出　　处：《电源技术》2018年第12期1876-1878,1907,共4页Chinese Journal of Power Sources

基　　金：国家"863"计划(2011AA05A113)

摘　　要：钒液流电池荷电状态(SOC)是反馈电堆剩余容量,实时评价电堆状态的重要参数。电极电位法监测电解液SOC的关键技术是参比电极具有耐强酸性并长期稳定,工作电极电位即代表电解液氧化还原电位大小。通过实验测定了钒电池负极电解液(V^(2+))中5种参比电极的电位稳定性,并在电池充电、放电全过程监测了5种参比电极的电位变化,筛选出了监测负极电解液SOC的最佳参比电极。实验结果表明:银/硫酸银固态参比电极和汞/硫酸亚汞标准参比电极稳定性好,都能很好地感知负极电解液氧化还原反应各价态钒离子浓度变化,同时考虑到电极需要被安装在电解液管路中实现在线监测,因此银/硫酸银固态参比电极是最佳选择。The state of charge is an important parameter to evaluate the battery capacity and performance.The state of charge of the electrolytes can be monitored by measuring the potential of indicator electrodes in the electrolytes.The key factor of this method is the long-term stability of reference electrode potential.In this paper,the potential stability of various reference electrodes in negative electrolyte was investigated.It is found that the solid-state reference electrode and the reference electrode showed very stable potential after long time soaking in negative electrolyte.The electrode is suitable to monitor the state of charge of negative electrolyte.

关 键 词：全钒液流电池 荷电状态 参比电极 电位稳定性 

分 类 号：TM912[电气工程—电力电子与电力传动]