| 摘要 |
A secondary cell has a hydrogen-storing alloy electrode as a negative-electrode plate 26 , and the electrode contains first hydrogen-storing alloy particles 36 and second hydrogen-storing alloy particles 37 . The first hydrogen-storing alloy particles 36 has composition expressed by general expression (I) (La<SUB>a1</SUB>Ce<SUB>b1</SUB>Pr<SUB>c1</SUB>Nd<SUB>d1</SUB>(Al)<SUB>el</SUB>)<SUB>1-x</SUB>Mg<SUB>x</SUB>(Ni<SUB>1-y</SUB>(T1)<SUB>y</SUB>)<SUB>z</SUB>, where A1 represents at least one element selected from a group consisting of Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ca, Sr, Sc, Y, Ti, Zr and Hf; T1 represents at least one element selected from a group consisting of V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Al, Ga, Zn, Sn, In, Cu, Si, P and B; a1, b1, c1, d1 and e1 are in the range of 0<a1<=0.25, 0<=b1, 0<=c1, 0<=d1 and 0<=e1 and satisfy the relation a1+b1+c1+d1+e1=1; and x, y and z are in the range of 0<x<1, 0<=y<=0.5 and 2.5<=z<=4.5.
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