镍氢电池在放电过程中的电极极化  

Study on Electrode Polarizations in Discharge Process of Nickel metal Hydride Battery

作　　者：邢政良[1] 李国勋[1] 萧今声 王超群[1] 

机构地区：[1]北京有色金属研究总院

出　　处：《稀有金属》1999年第1期1-3,共3页Chinese Journal of Rare Metals

基　　金：国家自然科学资助项目

摘　　要：利用暂态技术电流阶跃法对镍氢电池的正负极在放电过程中的电化学极化、浓差极化及欧姆极化进行了研究。镍氢电池放电电压的衰减主要是由正极衰减引起的，浓差极化又是正极衰减的主要原因。负极的电化学极化和浓差极化随放电深度的增加而变大，但电化学极化增加的幅度较小。For identifying various electrode polarization during discharge of nickel metal hydride battery, a transient technique current step method was employed. The results show that the potential decay of positive electrode dominates the depression of voltage plateau for battery. And the decay is mainly caused by diffusion polarization. For negative electrode, at the beginning of discharge, electrochemical polarization determines the decay of potential. The diffusion polarization gradually influences the polarization processes and at last becomes the controlling step. Ohmic polarization exhibits a slightly change during discharge process.

关 键 词：电流阶跃 电压平台 镍氢电池 放电过程 电极极化 

分 类 号：TM912.901[电气工程—电力电子与电力传动]