報文
Influence of Temperature on Discharge Process of Misch Metal-Based Hydrogen Storage Alloy Electrodes
2002 年 70 巻 1 号 p. 2-7
詳細
2002 年 70 巻 1 号 p. 2-7
For the purpose of clarifying the reason why the discharge capacity of a misch metal (Mm)-based hydrogen storage alloy negative electrode in nickel-metal hydride battery drastically decreases at relatively low temperatures, the activation energies for hydrogen diffusion in the alloy bulk, charge-transfer reaction on the electrode surface and the electric conductivity of KOH solution were evaluated in the temperature range of 25°C to −40°C. By comparing the activation energies with one another, it was clarified that both the hydrogen diffusion and the charge-transfer reaction significantly influenced the discharge process at relatively low temperatures. The addition of Mo to the MmNi3.6Mn0.4Al0.3Co0.7 alloy was found to be effective for the improvement of the high-rate dischargeability at relatively low temperatures.
