Nickel manganese composite hydroxide particles and manufacturing method thereof, cathode active material for a non-aqueous electrolyte secondary battery and manufacturing method thereof, and a non-aqueous electrolyte secondary battery

A method for manufacturing nickel manganese composite hydroxide particles by a crystallization reaction such that the nickel manganese composite hydroxide particles can be expressed by a general formula NixMnyCozMt(OH)2+a

• wherein x+y+z+t=1, 0.3≦x≦0.7, 0.1≦y≦0.55, 0≦z≦0.4, 0≦t≦0.1, 0≦a≦0.5, and M is one or more added element that is selected from among Mg, Ca, Al, Ti, V, Cr, Zr, Nb, Mo and W,
• the manufacturing method comprising:
• a nucleation step of controlling an aqueous solution for nucleation, which includes at least a metallic compound that contains nickel and a metallic compound that contains manganese, and does not include a complex ion formation agent that forms complex ions with nickel, manganese and cobalt, so that the temperature of the solution is 60° C. or greater, and so that the pH value that is measured at a standard solution temperature of 25° C. is 11.5 to 13.5, and generating nuclei as center sections comprising fine primary particles;
• and
• a particle growth step of controlling an aqueous solution for particle growth, which includes the nuclei that were formed in the nucleation step and does not substantially include a complex ion formation agent that forms complex ions with nickel, manganese and cobalt, so that the temperature of the solution is 60° C. or greater, and so that the pH value that is measured at a standard solution temperature of 25° C. is 9.5 to 11.5, and is less than the pH value in the nucleation step, and growing an outer shell section comprising primary particles having a plate shape or needle shape that is larger than the fine primary particles on an outer surface of the nuclei.