Patent ID: 7344803

Claim:
An alkaline primary cell comprising a positive electrode mixture including nickel oxyhydroxide in which cobalt and zinc alone used at least as an active material for a positive electrode for use as a substitutional element for solid solution, wherein, said nickel oxyhydroxide, a general formula of which being Ni 1-x-y Co x Zn y OOH, has the following total amount X+Y of molar ratios of cobalt atom and zinc atom when the molar ratio of cobalt is represented by X and the molar ratio of zinc is represented by Y 2 mole %≦X+Y≦16 mole %, the molar ratio X of cobalt and the molar ratio Y of zinc, both serving as a solid solution substitutional element, satisfy the following relationship Y≦3/2×X+1/2 Y≧2/3×X−1/3, and a diffraction peak obtained as a result of measurement of X-ray powder diffraction of said nickel oxyhydroxide appears only in the vicinity of 18.5° within a range of 2θ=10°-30°.