| 摘要 |
PROBLEM TO BE SOLVED: To obtain high energy density by using nickel oxyhydroxide particles whose surfaces are coated with cobalt oxyhydroxide, or solid solution particles mainly comprising nickel oxyhydroxide particles as active material particles. SOLUTION: In the manufacture of a positive electrode, nickel hydroxide powder is stirred in an aqueous solution containing an oxidizing agent to oxidize 'the nickel hydroxide, nickel oxyhydroxide obtained is washed, stirred in an alkaline aqueous solution, a cobalt salt aqueous solution is dropped therein to obtain nickel oxyhydroxide particles whose surfaces are coated with cobalt oxyhydroxide, obtained particles are washed and dried, then formed in a pasty material, and the pasty material is filled in a substrate. By coating the surfaces of the nickel oxyhydroxide particles of an active material with the cobalt oxyhydroxide of a conductive material, the amount of conductive material is reduced compared with the use of only powdery cobalt hydroxide as the conductive material, the physical filling capability of the active material is enhanced, irreversible electric capacity is reduced, and energy density is enhanced. |
