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Abstract

A positive collector electrode with an active material which comprises a double hydroxide of the general formula [M.sup.2+ (1-x)Fe.sup.3+ x(OH).sub.2 ].sup.x+ [(x/n)X.sup.n-, yH.sub.2 O].sup.x- in which the transient parameter is 0.05.ltoreq.x.ltoreq.0.4, preferably 0.2, M.sup.2+ is preferably Ni.sup.2+, and X.sup.n- is an anion species, shows a remarkable improvement in electrical behavior as compared to analogous double hydroxides in which X.sup.n- is SO.sub.4.sup.2-, NO.sub.3.sup.- or CO.sub.3.sup.2-. These electrodes, known as siderophile electrodes, exhibit resistance to iron contamination if X.sup.n- is formed at least partly by PO.sub.4.sup.3- or HPO.sub.4.sup.2-. This improvement is manifested in a constancy of the specific discharge capacity at a high level over many cycles during charge/discharge operation as compared to a Cd/Cd(OH).sub.2 electrode. The process for producing the electrode is also disclosed.

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First Claim