Hydrogen storage alloy, process for producing hydrogen storage alloy, hydrogen storage alloy electrode, process for producing hydrogen storage alloy electrode, and battery

摘要

Hydrogen storage alloy has: (1) a main composition expressed by the formula of Mm-(Ni—Al—Co—Mn—Mo); (2) a ratio of the number of atoms expressed by the formula of (Ni—Al—Co—Mn—Mo) is 5.7(Ni+Al+Co+Mn+Mo)≦8, and 3.5≦Ni, when Mm is set at 1 in a ratio of the number of atoms; and (3) an internal structure having hydrogen storage alloy phase expressed by the general formula of AB₅, and a second phase existing in the hydrogen storage alloy phase.