Mm-Ni type hydrogen storage alloy for Ni/MH secondary cell

Details Mm-Ni type hydrogen storage alloy for Ni/MH secondary cell Mm-Ni type hydrogen storage alloy for Ni/MH secondary cell

1998-05-15

2000-08-22

Mai, Ngoclan

Alloys or metallic compositions

Containing over 50 per cent metal but no base metal

420900, 429220, 429221, 429223, 429224, C22C 3000

Patent

active

061067687

ABSTRACT:
There are disclosed Mm/Ni type hydrogen storage alloys for Ni/MH secondary cells. The alloys which allow the cells to be of high performance and high capacity can be prepared at lower costs than the production costs of conventional Co-rich hydrogen storage alloys, by reducing the amount of the Co element. The Co element is partially or wholly replaced by by Cr, Cu, Fe, Zn and/or Zi, which are each known to be of stronger affinity for hydrogen than is Co and to have such a strong oxidation tendency in electrolytes as to form a highly dense oxide. The novel alloys have discharge capacities and electrode life span as good as those of the conventional Co-rich hydrogen storage alloys but have advantages over the Co-rich alloys, including performance-to-cost.

REFERENCES:
patent: 5512385 (1996-04-01), Komori et al.
patent: 5738953 (1998-04-01), Lichtenberg et al.
patent: 5916519 (1999-06-01), Saito et al.
T. Sakai et al., "Effects of Microencapsulation of Hydrogen Storage Alloy on the Performances of Sealed Nickel/Metal Hyride Batteries," J. Electrochem Soc., Mar. 1987, pp. 558-562.
J. J. G. Willems et al., "From Permanent Magnets to Rechargeable Hydride Electrodes," Journal Of the Less-Common Metals, vol. 129, 1987, pp. 13-30.
T. Sakai et al., "Rare-earth-based alloy elctrodes for a nickel-metal hydride battery," Journal of the Less-Common Metals, vol. 172-174, 1991, pp. 1175-1184.

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