Electric accumulator

Details Electric accumulator Electric accumulator

H - Electricity

01

M

H01M 4/32 (2006.01) H01M 4/62 (2006.01) H01M 10/34 (2006.01)

Patent

CA 2137318

The positive electrode of a Ni/metal hydride accumulator is formed from a mass mixture of Ni(OH) 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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