Patent ID: 6783892
Filing Date: 2004-08-31
Classification: H01M,Y02E

Abstract:
A positive electrode for an alkaline storage battery comprising an active material comprising a nickel hydroxide powder,wherein said nickel hydroxide is a solid solution containing magnesium, a magnesium content in said nickel hydroxide is 2 to 7 mol % of all metallic elements contained in said nickel hydroxide, a tap density of said nickel hydroxide is 1.9 g/cm3 or more, a half-width of a peak attributed to (101) face near 2&thgr;=37 to 40Â° in a powder X-ray diffraction pattern of said nickel hydroxide by CuK &agr; radiation is 0.7 to 1.2Â°, a ratio of intensity B of a peak in said powder X-ray diffraction pattern attributed to (001) face near 2&thgr;=18 to 21Â° to intensity A of said peak attributed to (101) face near 2&thgr;=37 to 40Â°: B/A is 1.1 or more, and a sulfate ion content in said nickel hydroxide is 0.5 wt % or less; further containing 0.5 to 3 parts by weight of a powder comprising an oxide of at least one element selected from the group consisting of Y, Yb, Lu, Ti and Ca per 100 parts by weight of said active material.