Patent ID: 8877372

Claim:
An alkaline secondary battery comprising a positive electrode having a substrate and active material particles principally made of nickel hydroxide, a negative electrode, and an electrolyte solution, wherein the positive active material particle has a core layer containing nickel hydroxide and a conductive auxiliary layer which coats the surface of the core layer, the conductive auxiliary layer contains a cobalt oxyhydroxide phase and a cerium dioxide phase, the electrolyte solution is principally made of an aqueous sodium hydroxide solution, the cobalt oxyhydroxide phase has a rhombohedral structure and an R3m structure, and a portion of cobalt of the cobalt oxyhydroxide phase is substituted by cerium, and the cerium dioxide phase has a fluorite structure and an Fm3m structure, and a portion of cerium of the cerium dioxide phase is substituted by cobalt.