Ni/metal hydride accumulator

Details Ni/metal hydride accumulator Ni/metal hydride accumulator

1994-11-30

1996-03-19

Willis, Jr., Prince

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

H01M 452

Patent

active

055003095

ABSTRACT:
The positive electrode of a Ni/metal hydride accumulator is formed from a mass mixture of Ni(OH).sub.2 and an oxidation-resistant graphite. The stable graphite is notable for a high degree of crystallinity and a low ash content. In conventional Ni/metal hydride accumulators, cobalt compounds play an essential part in developing a conductive matrix within their positive nickel hydroxide electrodes, leading to reductive destruction of the matrix by severe high temperature short circuit testing. In contrast, the same accumulators, with positive electrodes produced according to the present invention, survive the test with only a temporary and slight decline in capacity.

REFERENCES:
patent: 4130696 (1978-12-01), Gunter
patent: 4514473 (1985-04-01), Atkin et al.
patent: 4663256 (1987-05-01), Corrigan
patent: 4935318 (1990-06-01), Ikoma et al.
patent: 5032475 (1991-07-01), Hasebe et al.
Japanese Kokai; 63-334, Jan. 5, 1988, Production of Resin-Bonded Carbon Molding, Abstract.

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