Santoku Corporation

Tsong P Perng

Bao-Min Ma

Qun Chen

James Landi

Manganese-free rare earth-transition metal AB -type hydrogen-absorbing alloys having favorable high rate discharge characteristics, suitable for use in rechargeable batteries for electrical vehicles or hybrid electrical vehicles, include compositions of the general formula: R(Co Al M Ni ) , where R is at least one element selected from rare earth elements and yttrium (Y), M is at least one refractory metal selected from Groups IVB, VB, and VIB of the periodic table, the value of u is from 0 to about 0.25, v is from 0 to about 0.10, w is from 0 to about 0.05, and z, the ratio of R(Co Al M Ni )/R, is from about 4.70 to about 5.50. The unit cell volume is from about 87 to about 88.5 A at 25&deg; C., the plateau pressure is from about 3 to about 10 apsi at 25&deg; C., and the composition is essentially free of manganese.

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Hsinchu, Taiwan

Tsong P Perng