NICKEL MANGANESE CONTAINING-COMPOSITE HYDROXIDE AND METHOD FOR PRODUCING SAME

The present invention industrially provides: a non-aqueous electrolyte secondary battery having a high energy density and high cycling characteristics; a cathode active material for a non-aqueous electrolyte secondary battery having a high packing efficiency; and a nickel manganese containing composite hydroxide having a small particle size, a narrow particle size distribution, and a high sphericity. When producing the nickel manganese containing composite hydroxide by a crystallization reaction using material solution where metal compounds including nickel and manganese dissolve, a nucleation process is performed in a non-oxidizing atmosphere by stirring an aqueous solution for nucleation, that includes the quantity of the material solution corresponding to 0.6% to 5.0% of the whole amount of substance of metal element included in a metal compound used for the overall crystallization reaction, and has an ammonium ion concentration of 3 to 25 g/L and a pH of 12 to 14 (at the temperature of 25°C as a standard), and controlling the stirring power requirement to be within a range of 6 to 30 kW/m 3 , after that, generated nuclei are grown by supplying the material solution to the aqueous solution for particle growth that includes the nuclei with an ammonium ion concentration of 3 to 25 g/L and a pH of 5 to 12 (at the temperature of 25°C as a standard).