Patent ID: 7718315
Filing Date: 2010-05-18
Classification: C01G,C01P,H01M

Abstract:
1. An alkaline battery comprising a positive electrode material mixture, a negative electrode, a separator interposed between said positive electrode material mixture and said negative electrode, and an alkaline electrolyte, wherein said positive electrode material mixture includes a first active material comprising nickel oxyhydroxide and a second active material comprising manganese dioxide, and the content of said manganese dioxide in said positive electrode material mixture is 20 to 90 wt %, said nickel oxyhydroxide is a solid solution in which both manganese and cobalt are dissolved as an additive element, the amount of each of manganese and cobalt dissolved in said solid solution is 1 to 7 mol % of the total of all of metallic elements included in said solid solution, and a content of nickel in said nickel oxyhydroxide is not less than 45 wt %, an average particle diameter on a volume basis of said nickel oxyhydroxide measured with a laser diffraction particle size distribution analyzer is 3 to 20 μm, and said nickel oxyhydroxide includes a γ-type crystal structure and a β-type crystal structure, and a powder X-ray diffraction pattern of said nickel oxyhydroxide includes a diffraction peak P