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The study of the ageing of the manganese-substituted nickel hydroxides with α-structure in the KOH electrolytic medium of Ni/Cd batteries has given evidence of a new type of structure interstratification. This behaviour is due to spontaneous oxidation of the manganese ions, which are trivalent in the starting phases, to the tetravalent state in the aged materials. According to the infrared and chemical...
Substitution of over 20% of trivalent manganese for nickel leads to α-type nickel hydroxides. In these materials, prepared by precipitation, the compensation of the positive charge excess within the slab results from the insertion of CO 32- anions in the interslab space, as previously reported in the homologous cobalt or iron systems. These phases are unstable in the 5 M KOH electrolytic...
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