PURPOSE: To improve an initial discharge characteristic without spoiling high capacity by solving a problem that discharge capacity is very small in the initial stage of a charging and discharging cycle when conventional Zr-Mn- Mo-Cr-Ni type alloy is used in an electrode in a hydrogen storage alloy electrode to store and release electrochemical hydrogen reversibly.
CONSTITUTION: A general equation of hydrogen storage alloy or the hydride is expressed by ZrMnwMoxMyNiz [provided that, M is at least a single kind of element selected from a group composed of Fe and Co, and (0.4≤w≤0.8, 0.1≤x≤0.35, 0≤y≤0.2, 1.0≤z≤1.5 and 2.0≤w+x+y+z≤2.4) is realized]. A main component of an allay phase is a C15 type lavas phase, and the crystal lattice constant (a) is (7.04 angstrom≤a≤7.13 angstrom).
YAMAMURA KOJI
TSUJI YOICHIRO
MAEKAWA NAOKO
IWAKI TSUTOMU
