Hydrogen-absorbing alloy for battery, method of manufacturing th

Details Hydrogen-absorbing alloy for battery, method of manufacturing th Hydrogen-absorbing alloy for battery, method of manufacturing th

1995-05-30

1997-08-05

Nuzzolillo, M.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

421 59, 421101, 421219, 421221, 420900, H01M 402

Patent

active

056541155

ABSTRACT:
A hydrogen-absorbing alloy for battery according to the present invention comprises an alloy having the composition represented by a general formula A Ni.sub.a Mn.sub.b M.sub.c [where, A is at least one kind of element selected from rare earth elements including Y (yttrium), M is a metal mainly composed of at least one kind of element selected from Co, Al, Fe, Si, Cr, Cu, Ti, Zr, Zn, Hf, V, Nb, Ta, Mo, W, Ag, Pd, B, Ga, In, Ge and Sn, 3.5.ltoreq.a.ltoreq.5, 0.1.ltoreq.b.ltoreq.1, 0.ltoreq.c.ltoreq.1, 4.5.ltoreq.a+b+c.ltoreq.6], wherein the alloy has columnar structures in which the area ratio of the columnar structures having the ratio of a minor diameter to a major diameter (aspect ratio) of 1:2 or higher is 50% or more. Further, an average minor diameter of the columnar structures is set to 30 microns or less. With this arrangement, there can be provided a nickel-metal hydride battery capable of satisfying the three leading characteristics of a high electrode capacity, long life and good rising-up all together.

REFERENCES:
patent: 4605603 (1986-08-01), Kanda
patent: 5008164 (1991-04-01), Furukawa et al.
patent: 5219678 (1993-06-01), Hasebe et al.
JP 3188236, Aug. 16, 1991, abstract only.
Journal of Alloys and Compounds, 192(1993), pp. 176-178, R. Mishima, et al., "Hydrogen Storage Alloys Rapidly Solidified by the Melt-Spinning Method and Their Characteristics as Metal Hydride Electrodes" (month N/A).

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