Patent ID: 7476466
Filing Date: 2009-01-13
Classification: H01M,Y02E

Abstract:
1. An alkaline dry battery comprising: a positive electrode including a positive electrode active material comprising a nickel oxyhydroxide powder and a manganese dioxide powder, a conductive agent comprising graphite, and a calcium compound; and a negative electrode including a negative electrode active material comprising a zinc or zinc alloy powder, a gelling agent, and an aqueous solution of potassium hydroxide, wherein the positive electrode includes a calcium compound having a content of iron element of 150 ppm or less in an amount of 0.1 to 10 mol % with respect to the positive electrode active material, the nickel oxyhydroxide powder has an average nickel valence of 2.95 or more and an average particle diameter of 8 to 18 μm, the weight ratio of the nickel oxyhydroxide powder and the manganese dioxide powder is 20:80 to 90:10, the zinc or zinc alloy powder includes a first powder having a particle diameter more than 75 μm and 425 μm or less, and a second powder having a particle diameter more than 5 μm and 75 μm or less, the weight ratio of the first powder and the second powder is 65:35 to 75:25, and the concentration of the aqueous solution of potassium hydroxide is 33 to 35% by weight.