Multiphase hydrogen-absorbing alloy electrode for an alkaline storage cell
AssigneeSanyo Electric Co., Ltd.
InventorsNobuhiro Furukawa, Kazuro Moriwaki, Mitsuzo Nogami, Seiji Kameoka, Motoo Tadokoro
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Abstract
A hydrogen-absorbing alloy electrode for an alkaline storage cell, the electrode including a hydrogen-absorbing alloy expressed by a composition formula ReBxMy, wherein Re is at least one element selected from a group consisting of rare earth elements and alkali earth elements, B is boron, and M is at least one element selected from a group consisting of Ni, Co, Mn, Al, Cr, Fe, Cu. Sn, Sb, Mo, V, Nb, Ta, Zn, Zr and Ti. The alloy consists essentially of an RM.sub.y main metal phase, and a subordinate boron-containing phase, such as a compound phase of boron and a IV-a, V-a, or VI-a group metal.
Claims7
In a hydrogen-absorbing alloy electrode for an alkaline storage cell comprising a hydrogen-absorbing negative electrode, a positive electrode and an electrolyte, the improvement comprising:
- a hydrogen-absorbing alloy consisting essentially of RBxMy present as a main metal phase and a subordinate metal phase, the main metal phase being represented by a composition formula R-My and the subordinate metal phase of the alloy includes at least boron, R being at least one element selected from a group consisting of rare earth elements and alkali earth elements, and M being at least one element selected from a group consisting of Ni, Co, Mn, Al, Cr, Fe, Cu, Sn, Sb, Mo, V, Nb, Ta, Zn, Zr and Ti, x being greater than 0.015 and less than 0.1 and y being greater than 3.5 and less than 6.0, said alloy having a hydrogen absorption pressure of 0.05 to 5 air pressure at a temperature of 40.degree. C.
Dependencies are inferred from the claim text.