Ball milling한 AB₂계 금속수소화물 전극의 전기화학적 특성

다국어 초록 (Multilingual Abstract)

The electrochemical properties of the AB₂-type (Zr-Ti-V-Ni-Cr-Co-Mn) metal hydride electrodes prepared by ball milling with AB₅-type {(LM)Ni_3.6Al_0.4Co_0.7Mn_0.3}(LM : Lanthanum-rich mischmetal) alloy powder as a surface activator were investigated. By ball milling with AB₅ type alloy powder, the activation of AB₂ type metal hydride electrode was accelerated resulting in an increase of discharge capacity from 35% to 85% of the maximum capacity at the first cycle. As the amount of surface activator increased the activation rate increased, whereas the discharge capacity increased with 10wt% and decreased with 20wt% addition of the surface activator. When the amount of the surface activator was kept constant as 10wt%, the discharge capacity and the activation rate increased with ball milling time up to 20 hours. However beyond 20 hours of ball milling time, they decreased drastically due to the nano-crystallization or amorphorzation of the alloy powder.