The effect of partial substitution on the hydrogen storage properties of Mg 2 Ni was investigated. It was found that as a result of substitution of Mg with a more electronegative element (Al or Mn), absorption of hydrogen easily occurs at lower temperature. The alloy powder prepared with a mechanical grinding method was also studied. This alloy powder was found to be mainly changed to an amorphous‐like state by this treatment. Consequently, the negative electrode of the mechanically ground Mg 2 Ni alloy shows a large discharge capacity, 750 mAh/g, which is two and one‐half times that of AB 5 type alloys. It was also found that the hydrogen reversibility of the mechanically ground Mg 1.9 A 0.1 Ni alloy electrode remarkably increased.
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Kohno et al. (1997) studied this question.
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