Ni/metal hydride accumulator
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United States of America Patent
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Mar 19, 1996
Grant Date -
N/A
app pub date -
Nov 30, 1994
filing date -
Dec 18, 1993
priority date (Note) -
Expired
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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.
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