Patent ID: 8741502

Claim:
A method for producing a nickel oxide powder material comprising a core particle (a) composed of a nickel oxide particle and a coating layer (b) comprising a zirconium hydroxide, which is formed on the surface of the core particle (a), as its main component and that the zirconium content to be contained in the coating layer (b) is 0.001 to 0.01 g/m 2 per surface area of the nickel oxide particle, the method comprising: a step (A) to form the nickel oxide particle having a coating layer comprising a zirconium hydroxide as its main component by supplying an aqueous solution comprising a zirconium salt and urea into an aqueous suspension comprising a nickel oxide particle, and a step (B) for subjecting the nickel oxide particle formed in said step (A) to solid/liquid separation and drying treatment.