MANUFACTURE OF ANODE ACTIVE MATERIAL FOR NICKEL-CADMIUM ALKALINE STORAGE BATTERY

摘要

PURPOSE:To stabilize viscosity of an anode active material, by mixing cadmium oxide powder or cadmium hydroxide powder in a specific aqueous solution of polyvinyl alcohol, and then adding the aqueous solution of polyvinyl alcohol to be moreover mixed so that a paste or slurry state can be formed. CONSTITUTION:In mixing cadmium oxide powder or cadmium hydroxide powder in an aqueous solution of polyvinyl alcohol, the aqueous solution of polyvinyl alcohol of 70 % or less in a saponification ratio and 500 or less in a polymerization degree is used, and then an aqueous solution of polyvinyl alcohol of 85 % or more in a saponification ratio is added to be moreover mixed so that the paste or slurry can be manufactured. By adding and mixing the aqueous solution of polyvinyl alcohol in this way after the preceded mixture, polyvinyl alcohol is prevented from directly sticking to cadmium oxide or cadmium hydroxide surface, with a rise in viscosity being suppressed. Strength of the electrode plate can be enlarged by molecular intertwinement, which is characteristic of polyvinyl alcohol, among powder particles. The viscosity can be hence stabilized.