| 摘要 |
PURPOSE:To improve the initial activation of an alloy and the electric conductivity thereof without causing any drop in productivity by treating a pulverized hydrogen storage alloy in an acid water solution, and further treating the alloy in an alkaline water solution after the treatment in the acid water solution. CONSTITUTION:A pulverized hydrogen alloy is treated in an acid water solution, and thereafter further treated in an alkaline water solution. As a result, a dense oxide film formed on the surface of the alloy at the time of pulverization, is well removed due to the chemical properties thereof. Also, the surface of the alloy is covered with a porous film mainly composed of a hydroxide. Even when the alloy is exposed to the atmosphere, therefore, the surface of the alloy is free from the generation of a dense oxide film. Also, as the porous film resembles very much a film generated within the battery, the film can also be applied to a negative electrode without impairing the electrochemical activity of the battery. |
