| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydrogen occlusion alloy electrode and a nickel hydrogen storage battery which is not inferior to discharge capacity and excellent in durability represented by the charging-discharging cyclic characteristic compared with conventional ones. SOLUTION: In the composition of hydrogen occlusion alloy powder, R1 denotes at least one element out of lanthanoids with atomic number 59-62, R2 denotes at least one element out of lanthanoids with the atomic number being Y and≥63, and X denotes at least one kind of metal elements not belonging to rare earth elements. When the composition formula is expressed by La<SB>a</SB>Ce<SB>b</SB>R1<SB>c</SB>R2<SB>d</SB>Ni<SB>e</SB>Co<SB>f</SB>S<SB>g</SB>, the following conditions are satisfied: a+b+c+d=1.0, 0.6≤a≤0.9, 0.05≤b, 0≤c, 0<d≤0.06, 5.0≤e+f+g≤5.4, and 0.1≤f≤1.20, 0 < g. COPYRIGHT: (C)2004,JPO
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