| 摘要 |
PROBLEM TO BE SOLVED: To provide new application regarding a low Co hydrogen storage alloy in which the content of Co is extremely low. SOLUTION: As the application of an alloy which can be expressed by the general formula of MmNia Mnb Alc Cod (wherein, Mm is misch metal, and 3.7≤a≤4.7, 0.3≤b≤0.65, 0.2≤c≤0.5, 0<d≤0.65, and 4.9≤a+b+c+d≤5.5), and in which the amount of corrosion at the time when a cycle test of 500 cycles is performed in the region where the hydrogen storage content (H/M) is 0.4 to 0.6 in a prescribed test A, use for a battery charged/ discharged in the central region of charge/discharge depth is proposed. The hydrogen storage alloy satisfying the conditions has inferior service life properties in the case of being charged/discharged in the critical region of charge/discharge depth (H/M=about 0.1 to 0.8), but has excellent performance in initial activity and service life properties (cycle properties) in the case of being charged/discharged in the central region. COPYRIGHT: (C)2005,JPO&NCIPI
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