A rare-earth metal-nickel-based hydrogen storage alloy, a production method thereof, and a cathode for a nickel-hydrogen secondary battery (RARE EARTH METAL-NICKEL HYDROGEN STORAGE ALLOY, PROCESS FOR PRODUCING THE SAME, AND ANODE FOR NICKEL-HYDROGEN RECHARGEABLE BATTERY)

摘要

(1);(R _1-x L _x ) (Ni _ly M _y ) _z (1);Mg, Ca, M, Co, Al, Mn, Fe, Cu, Zr (R, La, Ce, Pr, Nd, L: Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, Sc, , Ti, Mo, Si, V, Cr, Nb, Hf, Ta, W, B, C, 0.05? X? 0.4, 0? Y? 0.5, 3.0? Z 4.5) Wherein an opposite phase boundary perpendicular to the C axis of the crystal grains contains not less than 5 and not more than 25 but less than 95 and less than 95% Wherein at least 60% and less than 95% of the elements are placed in the reverse phase region, and a method for producing the rare earth metal-nickel-based hydrogen storage alloy.