放电深度对铅炭电池正极板栅腐蚀影响的探究  

Influence of discharge depth on corrosion of positive grids of lead carbon batteries

作　　者：胡晨 金翼 任阳 崔邴晗 杜春雨 HU Chen;JIN Yi;REN Yang;CUI Bing-han;DU Chun-yu(State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems,China Electric Power Research Institute,Beijing 100192,China;School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin Heilongjiang 150001,China)

机构地区：[1]中国电力科学研究院有限公司新能源与储能运行控制国家重点实验室,北京100192 [2]哈尔滨工业大学化工与化学学院,黑龙江哈尔滨150001

出　　处：《电源技术》2020年第12期1744-1747,共4页Chinese Journal of Power Sources

基　　金：国家电网公司科技项目(DG71-17-009)。

摘　　要：研究了储能条件下成品铅炭电池在不同放电深度(DOD)时的正极板栅失效行为特征。电化学测试结果显示0.4 C循环过后铅炭电池容量保持率存在很大差异,放电深度越大容量衰减越严重,导致全生命周期总能量存在最优值。扫描电子显微镜法(SEM)分析表明:循环后正极板栅均出现了腐蚀,其中放电深度大的板栅表面及内部产生明显裂纹和孔洞,为体相腐蚀;X射线衍射光谱法(XRD)和X射线光电子光谱法(XPS)则显示放电深度加大时板栅氧化更多并且导电性更差,这归因于较大放电深度增加了板栅表面腐蚀层组成变化和承受的应力,从而导致其腐蚀加剧和循环稳定性下降。The failure behavior and mechanism of the lead-carbon batteries for the energy storage applications under different depths of discharge(DOD)were studied.The experimental results show that the capacity retention of lead-carbon batteries is rather different after the cycling of different DODs at the current rate of 0.4 C.Higher DOD leads to more serious capacity degradation,demonstrating the presence of an optimized total energy.The SEM results reveal that the positive grids experience severe corrosion,and high DOD even causes cracks and holes in the bulk of positive grids.The XRD and XPS analyses indicate more oxidation and lower conductivity of positive grids for higher DODs,confirming their serious corrosion.The corrosion is ascribed to more composition variation and tension of the corrosion layer on the surface of positive grids under high DOD,which result in more severe grid corrosion and thus lower cycling stability.

关 键 词：铅炭电池 正极失效 正极板栅 使用寿命 板栅腐蚀 

分 类 号：TM912[电气工程—电力电子与电力传动]