The hydrogen storage alloy and its manufacturing method

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PROBLEM TO BE SOLVED : To provide a hydrogen storage alloy of an Mg-containing system by which substantial capacity in a secondary battery can be improved and which has no multistep plateau on the PCT curve and is easy of charge/discharge in the secondary battery and usable for a negative electrode active material of the secondary battery and also to provide its manufacturing method. SOLUTION : The alloy has a composition represented by formula Ln1-xMgxNiyMz(wherein, Ln is Y, Sc or a rare-earth metal element; M is Co, Mn, Al, Fe, V, Cr, Nb, Ga, Zn, Sn, Cu, Si, P or B; x, y, and z satisfy 0.1≤x≤0.5, 2.5≤y≤3.5 and 0≤z≤0.5, respectively; and the sum of y and z satisfies 3.0≤y+z≤3.5) and is composed of a crystalline material produced using liquisol quenching. Moreover, with respect to the PCT curve of the alloy measured at 40°C, the value of H/M at 0.5 MPa is ≥1.00 or the slope Pf of the PCT curve at H/M=0.4 to 0.5 is ≤0.7 or practically no two-or-more-step plateau is exhibited at H/M=0.3 to 0.9. COPYRIGHT : (C)2004, JPO