Patent ID: 7691531

Claim:
An alkaline primary battery comprising: a positive electrode comprising a positive electrode active material; a gelled negative electrode comprising zinc powder serving as a negative electrode active material; a separator disposed between said positive electrode and said negative electrode; and an electrolyte, wherein said positive electrode active material comprises spherical nickel oxyhydroxide comprising a crystal of a β-type structure, a powder X-ray diffraction profile of said spherical nickel oxyhydroxide obtained using a Cu target is such that a half-width W of a diffraction peak P derived from a (001) plane is 0.6° or less, the ratio H/W of a height H of said peak P to said half-width W is 10,000 or more, and nickel contained in said spherical nickel oxyhydroxide has a mean valence of 2.95 or more.