| abstract |
(57) [Summary] [Objective] To provide a nickel positive electrode with a long life in a charge-discharge cycle with a deep discharge depth. Further, it provides a nickel positive electrode having an excellent utilization factor in a wide temperature atmosphere. [Structure] An active material mixture mainly composed of nickel hydroxide, At least one of cobalt, cobalt hydroxide, and cobalt oxide and the lattice constant d of the (002) plane (angstrom) Contains carbon powder of 3.35 <d ≦ 3.45. Further, it contains the carbon powder or nickel powder having a specific surface area and particle diameter, and strontium hydroxide powder. |