Alkaline storage battery
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTetsuo Nanno, Kazuhiro Ota, Hiromu Matsuda
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Abstract
The present invention provides an alkaline storage battery which is superior in the rate of utilization of the active material, cycle life, and discharge characteristic through a more simplified way of preparation of a high-performance positive active material by addition of a smaller quantity of a cobalt compound than conventional methods. The alkaline storage battery is obtained by employing an active material prepared by rendering α-type cobalt hydroxide adhere on the surface of nickel hydroxide particles and then treating with an aqueous solution of sodium hypochlorite in the positive plate.
Claims4
An alkaline storage battery wherein cobalt oxyhydroxide obtained by oxidizing treatment of α-type cobalt hydroxide with an oxidizing agent exists on the surface of nickel hydroxide being the positive active material.
An alkaline storage battery which the specific electric conductivity of the positive active material is 1 to 10−4 S/cm under a load of 1000 kg/cm2 by 4-probe method.
An alkaline storage battery wherein nickel hydroxide the surface of which is covered with cobalt oxyhydroxide by adding nickel hydroxide powder into a solution of a cobalt salt, adjusting the pH to within the range 8-10, forming α-type cobalt hydroxide on the surface of nickel hydroxide, and subsequently oxidization treating with an oxidizing agent is employed as the positive active material.
Dependencies are inferred from the claim text.