NICKEL POSITIVE ELECTRODE PLATE FOR ALKALINE STORAGE BATTERIES AND METHOD FOR PRODUCING THE SAME

摘要

The present invention provides a sintered nickel positive electrode plates for alkaline storage batteries with a high capacity density in which the working voltage during discharge is kept from dropping and the utilization of the positive electrode active material remains high even at high temperatures. The electrode comprises a porous sintered nickel substrate and metal hydroxides mainly composed of nickel hydroxide impregnated in the substrate, the metal hydroxides including: a first layer comprising a hydroxide of at least one element selected from the group consisting of yttrium, ytterbium and lutetium, and being in contact with the substrate; a second layer comprising a mixture of nickel hydroxide and cobalt hydroxide, and covering the first layer; and a third layer comprising cobalt hydroxide and covering the second layer.