| abstract |
(57) [Summary] [Problems] (1) The stability with hydrogen is so high that it is difficult to release hydrogen, and (2) the problem that it is susceptible to corrosion and oxidation with an aqueous alkaline solution such as an alkaline electrolyte. It is an object of the present invention to provide a hydrogen storage alloy which is excellent in cycle life characteristics of storing and releasing hydrogen and has a large discharge capacity. SOLUTION: It is characterized by including a phase having a composition satisfying the following general formulas (1) and (2). (R 1-ab La a Ce b ) 1-c Mg c Ni ZXY-α-β Mn X Al Y Co α M β ... (1) C = (− 0.025 / a) + γ … (2) |