| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hydrogen storage alloy having output characteristics greatly exceeding a conventional range by specifying the alloy structure of the hydrogen storage alloy, particularly, a A-component element, and to provide an alkaline battery using the same as a negative electrode active material. <P>SOLUTION: The hydrogen storage alloy includes an A-component consisting of a rare earth element represented by Ln, and magnesium, and a B-component consisting of an element including at least nickel and aluminum. The hydrogen storage alloy has a main alloy phase of a A<SB>5</SB>B<SB>19</SB>type structure, and its general formula is represented by Ln<SB>1-x</SB>Mg<SB>x</SB>Ni<SB>y-a-b</SB>Al<SB>a</SB>M<SB>b</SB>where M is at least one type element selected from Co, Mn, and Zn, 0.1≤x≤0.2, 3.6≤y≤3.9, 0.1≤a≤0.2, and 0≤b≤0.1. The rare earth element Ln consists of maximum two elements including at least La, and stored hydrogen equilibrium pressure (Pa) is 0.03-0.17 MPa when a hydrogen storage amount H/M (an atomic ratio) is 0.5 at 40°C. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
