5. A method as claimed in any one of Li-Ni composite oxide claim 1-4 for producing a powder particle method, characterized in:
The lithium powder of the compound and the Ni-Co hydroxide particles are mixed, the resulting mixture is fired,
Ni-Co hydroxide particles is obtained through the following operation, a metal sulfate aqueous solution, an aqueous ammonia solution and a sodium hydroxide aqueous solution, the concentration of ammonia is controlled such that the reaction tank to 1.4 mol/L or less, and the (the concentration of ammonia reactor) /(group consisting of hydroxide concentration of the remaining in the reaction tank) is a 6 or more, to obtain Ni-Co hydroxide.
reaction tank
concentration of ammonia
1.4 mol/L
mol/L