| 摘要 |
PURPOSE:To suppress the drop of the discharge capacity of an electrode including powder of hydrogen storage alloy and enhance the cyclic characteristics by forming a layer of metal carbide in a part of the surfaces of this powder of hydrogen storage alloy. CONSTITUTION:A negative electrode 2 includes a power of hydrogen storage alloy which can reversibly store and release hydrogen as neg. electrode active material. By carburization process, metal carbides are formed on at least part of the surfaces of this powder of hydrogen storage alloy. This enhances the anti-erosiveness of the alloy powder, which suppresses its oxidation due to alkaline electrolytic solution or oxygen gas generated when the battery is over- charged. This allows to suppress the drop of the neg. electrode capacity, so that the cyclic characteristics are enhanced. |
