Super high capacity Ti-based hydrogen storage alloy for secondary battery electrodes

摘要

The present invention relates to a novel ultra high capacity Ti-based hydrogen storage alloy. The Ti-based hydrogen formal alloy of the present invention is represented by the following general formula:;Ti _A Zr _B V _C Mn _D Ni _E M _F;Wherein M is at least one metal selected from the group consisting of Cr, Co, Fe, Cu, Al, Si, Hf, Nb, Mo and RF, and RF is La, Ce, Nd and Sm At least one rare earth metal selected from the group; A, B, C, D, E and F are the atomic fractions of the alloy composition elements, respectively, 0.2≤A≤0.35, 0.03≤B≤0.15, 0.15≤C≤0.4, 0.08≤D≤0.2, 0.13≤E≤0.35 And 0 ≦ F ≦ 0.1, provided that A + B + C + D + E + F = 1 and A + B ≦ 0.45.;The Ti-based hydrogen storage alloy of the present invention has a mole molecular weight of 50 to 65 g / mol, a single-phase C14-hexagonal structure, lattice constant a of 4.902 to 5.00 A, c of 7.972 to 8.168 A, and a discharge capacity of 400 mAh. As an alloy having an ultra high capacity of more than / g, it is suitable for use as a negative electrode active material of Ni-MH (nickel-metal hydride) secondary batteries.