| 摘要 |
PURPOSE:To obtain a hydrogen storage alloy electrode having large hydrogen storage amount, stable in an alkaline electrolyte, and resistant to powdering attendant on hydrogen absorbing-desorbing by using a hydrogen storage alloy having polyphase structure in which an intermetallic compound phase having crystal structure other than the CaCu5 type and also having hydrogen absorbing- desorbing capability is dispersed in a metal phase mainly comprising a CaCu5 type intermetallic compound. CONSTITUTION:A hydrogen storage alloy has polyphase structure in which an intermetallic compound phase having crystal structure other than the CaCu5 type is dispersed in a metal phase mainly comprising a CaCu5 type intermetallic compound. The metal phase consists of a rare earth element selected Sc, Y, La, Ce, Pr, Nd, and Sm, and an element selected from Cr, Mn, Fe, Co, Ni, Cu, Al, and Si. The intermetallic compound phase consists of an element selected from Mo, Ti, Zr, V, Nb, and Ta, and an element selected from Cr, Mn, Fe, Co, Ni, Cu, Al, and Si. The hydrogen storage alloy obtained is stable in an alkaline electrolyte, has large hydrogen storage amount, and is resistant to powdering attendant on hydrogen absorbing-desorbing. |
