A Study on the Thermodynamic and Electrochemical Properties of MmNi₅ System Hydrogen Absorbing Alloys Mixed with Nickel Powder

니켈분말 첨가에 따른 MmNi₅계 수소저장합금의 열역학 및 전기화학적 특성

Effect of nickel powder to added to the hydrogen absorbing alloy electrode of $MmNi_{4.5}-xCoxMn_{0.3}Al_{0.2}$ system alloy was investigated. The addition of nickel powder was effective for the improvement of discharging characteristic. It was found that the discharge capacity was 310mAhig when the alloy negative electrode was mixed $MmNi_{3.75}CO_{0.75}Mn_{0.3}Al_{0.2}$ and nickel powder with a mix of one to three. Still another, we have investigated thermodynamic stability of hydrogen in the alloy negative electrode. As a result, enthalpy of hydrogen and hydrogen equilibrium pressure in the alloy negative electrode were a suitable value to easy hydrogen absorption-desorption.