| abstract |
Disclosed is a hydrogen storage alloy of which the chemical composition is represented by the general formula M1 t M2 u M3 v Ca w Mg x Ni y M4 z (wherein: 16×(d-1.870)/(d-r) ≤ v ≤ 16×(d-1.860)/(d-r); 1.6 ≤ w ≤ 3.2; 4.1 ≤ x ≤ 5.1; 3.2 ≤ (y+z)/(t+u+v+w+x) ≤ 3.4; t+u+v+w+x+y+z = 100; M1 is one or at least two elements selected from La, Pr, and Nd; M2 is one or at least two elements selected from V, Nb, Ta, Ti, Zr, and Hf; M3 is one or at least two elements selected from Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; M4 is one or at lest two element selected from Co, Mn, Al, Cu, Fe, Cr, Zn; d is the average atomic radius of the elements selected as M1; and r is the average atomic radius of the elements selected as M3). Further disclosed are an electrode and secondary battery using said hydrogen storage alloy. |