| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rare earth-Mg-Ni-based hydrogen storage alloy in which the drop of a working voltage is suppressed even after long-term standing and the high working voltage is obtained when the alloy is applied to a nickel hydrogen secondary battery. <P>SOLUTION: The nickel hydrogen secondary battery includes particles (36) of the hydrogen storage alloy in a negative electrode (26). The hydrogen storage alloy has a composition expressed by general formula (La<SB>a</SB>Nd<SB>b</SB>A<SB>c</SB>D<SB>d</SB>)<SB>1-w</SB>Mg<SB>w</SB>Ni<SB>x</SB>Al<SB>y</SB>T<SB>z</SB>. In formula, A, D and T respectively denote elements of at least one kind selected from a group consisting of Sm and Gd, a group consisting of Pr, Eu and the like, a group consisting of V, Nb, etc.; subscripts a, b, c, d satisfy the relationships respectively expressed by a≥0, b≥0, c>0, 0.1>d≥0, a+b+c+d=1, and subscripts w, x, y, z are respectively in ranges shown by 0<w≤0.25, 0.05≤y≤0.35, 0≤z≤0.5, 3.15≤ x+y+z≤3.35. <P>COPYRIGHT: (C)2010,JPO&INPIT |
