Nickel-cobalt-manganese complex hydroxide particles and method for producing same, positive electrode active material for nonaqueous electrolyte secondary battery and method for producing same, and nonaqueous electrolyte secondary battery

2:

• The method for producing nickel cobalt manganese composite hydroxide particles according to claim 1, wherein
• the aqueous solution for particle growth is formed by adjusting a pH of the aqueous solution for nucleation after completing the nucleation step.

3:

• The method for producing nickel cobalt manganese composite hydroxide particles according to claim 1, wherein
• the aqueous solution for particle growth is prepared by adding the aqueous solution containing the nuclei formed in the nucleation step to an aqueous solution distinct from the aqueous solution for nucleation in which the nuclei have been formed.

4:

• The method for producing nickel cobalt manganese composite hydroxide particles according to claim 1, wherein
• the particle growth step is performed after discharging a part of a liquid portion of the aqueous solution for particle growth after the nucleation step.

5:

• The method for producing nickel cobalt manganese composite hydroxide particles according to claim 1, wherein
• a temperature of each aqueous solution is maintained at 20° C. or more in the nucleation step and the particle growth step.

6:

• The method for producing nickel cobalt manganese composite hydroxide particles according to claim 1, wherein
• an ammonia concentration of each aqueous solution is maintained within a range of 3 to 25 g/l in the nucleation step and the particle growth step.

7:

• The method for producing nickel cobalt manganese composite hydroxide particles according to claim 1, wherein
• a nickel cobalt manganese composite hydroxide obtained in the particle growth step is covered with a compound including at least one of the additional elements.

8:

• Nickel cobalt manganese composite hydroxide particles represented by a general formula:
• NixCoyMnzMt(OH)2+α, where 0.3≦x≦0.7, 0.1≦y≦0.4, 0.1≦z≦0.5, 0≦t≦0.02, x+y+z+t=1, 0≦α≦0.5, and M is at least one additional element selected from the group consisting of Ti, V, Cr, Al, Mg, Zr, Nb, Mo, Hf, Ta and W,
• the nickel cobalt manganese composite hydroxide particles being spherical secondary particles formed by aggregation in a random direction of a plurality of platelike primary particles having an average thickness of 10 to 300 nm and an average length of 100 to 3000 nm.

9:

• The nickel cobalt manganese composite hydroxide particles according to claim 8, wherein
• the secondary particles have an average particle diameter of 3 to 7 μm, and a value represented by an expression of:
• [(d90−d10)/average particle diameter] as a marker indicating spreading of a particle size distribution of 0.55 or less.

10:

• The nickel cobalt manganese composite hydroxide particles according to claim 8, wherein
• at least one of the additional elements are uniformly distributed inside the secondary particles and/or surfaces thereof are uniformly covered with at least one of the additional elements.

13:

• The method for producing a cathode active material for a nonaqueous electrolyte secondary battery according to claim 12, wherein
• calcination is performed at a temperature of 350° C. to 800° C. before the firing step.

14:

• A cathode active material for a nonaqueous electrolyte secondary battery represented by a general formula:
• Li1+uNixCoyMnzMtO2, where −0.05≦u≦0.20, x+y+z+t=1, 0.3≦x≦0.7, 0.1≦y≦0.4, 0.1≦z≦0.4, 0≦t≦0.02, and M is at least one additional element selected from the group consisting of Ti, V, Cr, Al, Mg, Zr, Nb, Mo, Hf, Ta and W, the cathode active material including a lithium nickel cobalt manganese composite oxide of a composite oxide containing lithium with a layer structure belonged in hexagonal crystal system, and having an average particle diameter of 2 to 8 μm and a value represented by an expression of:
• [(d90−d10)/average particle diameter] as a marker indicating spreading of a particle size distribution of 0.60 or less.

16:

• A nonaqueous electrolyte secondary battery having a positive electrode formed with the cathode active material for a nonaqueous electrolyte secondary battery according to claim 14.