粉末微电极研究硫酸铅颗粒的电化学活性  

Investigation of Electrochemical Reactivity of PbSO_4 Particles Using Powder Microelectrode

作　　者：李阳[1] 汪的华[1] 赵光金[2] 吴文龙[2] 朱华[1] 

机构地区：[1]武汉大学资源与环境科学学院,湖北武汉430079 [2]河南省电力公司电力科学研究院,河南郑州450052

出　　处：《武汉大学学报（理学版）》2015年第3期213-218,共6页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金资助项目(51325102)

摘　　要：铅酸蓄电池负极活性物质硫酸铅颗粒长大造成的不可逆硫酸盐化是电池早期失效的主要原因之一.本文在合成不同粒径硫酸铅的基础上,借助粉末微电极技术,采用循环伏安法研究了不同粒径硫酸铅颗粒的电化学活性及其可能的电化学活化途径.结果表明,粒径10μm左右硫酸铅颗粒的电化学活性低于粒径2μm左右硫酸铅粉末,经5mV/s的100周循环伏安扫描后,大粒径硫酸铅也可以一定程度上被再活化,峰电流提高10倍以上;非对称循环伏安法可以有效地缩短电极活化所需时间,而快速的循环伏安扫描活化效果较差.Sulfation of the negative plate is one of the major reasons of the early failure of lead-acid batteries,which is caused by the formation of the large size of PbSO4 particles during the operation of the batteries.Based on the synthesis of lead sulfate powder with different particle size and the aid of the powder microelectrode,the electrochemical activity and the possible electrochemical activation methods of lead sulfate particles were studied by cyclic voltammetry（CV）.It was found that the PbSO4 particles with an average size of 10μm can be activated through CV cycling,but it is much slower than that of the particles in an average size of 2μm.After 100 weeks of cyclic voltammetry（5mV/s）,lead sulfate particles with larger size can also be reactivation,and the peak current increased more than 10 times.Rapid potential scanning rate is not helpful to the activation of the large particles,while an asymmetrical CV method can not only activate the particles but also accelerate the activation process.

关 键 词：硫酸盐化 铅酸蓄电池 粉末微电极 硫酸铅 活化 

分 类 号：O646.541[理学—物理化学]