中文摘要：

为了分析储氢合金放电过程中的电化学反应与动力学变化规律，采用电化学交流阻抗分析方法研究LaNi3．8Co0．6Mn0．3A10．3合金电极在不同放电深度下的电化学行为。结果表明：随着放电深度的增加，电极表面活性氢覆盖面积S及内部金属颗粒间接触电阻尺。逐渐降低，即电极的导电性增加；此外，交换电流密度I。也随放电深度增加而增大，意味着电极表面反应速率加快，同时氢扩散系数DH明显降低；合金电极动力学在放电前期主要由电极表面反应速率控制，后期由电极中氢原子在合金颗粒内部的氢扩散系数控制。

英文摘要：

The electrochemical behaviors of LaNi3.8Co0.6Mn0.3A10.3 alloy under different depth of discharge（DOD） have been studied by electrochemical impedance spectroscopy （EIS） to discuss the relationship between electrochemical reaction and kinetics. It shows that the area of active reaction superficial on the electrode S and internal contact resistance Rpp decrease gradually with the increasing of DOD, implying the improvement of electrical conductivity. Moreover, the exchange current density I0 increases, indicated the surface reaction rate has been accelerated, while the hydrogen diffusion coefficient decreases obviously. To electrode kinetics, the electrochemical reaction kinetics is mainly controlled by surface reaction at low depth of discharge, and hydrogen diffusion internal of alloy particles at high depth of discharge.