Hydrogen storage alloy and hydrogen storage / release system using the alloy

摘要

PROBLEM TO BE SOLVED: To produce a hydrogen occlusion alloy in which occlusion starting temperature is reduced while holding the amount of hydrogen to be occluded constructing a hydrogen occluding-discharging system favorable in energy efficiency and device cost. SOLUTION: An alloy in which a part of the Mg site and/or Ni site in the conventional Mg2Ni alloy is substituted with elements and forming an alloy or a compound with a reverse CaF2 structure expressed by 2 and an alloy expressed by the general formula of (Mg1-aa)1-y(Ni1-bb)y is prepared, and the hydrogen occlusion alloy in which occlusion starting temperature is reduced by 20 deg.C while holding the amount of hydrogen to be occluded is prepared.