Aluminum-coated nickel cobalt containing composite hydroxide and method for manufacturing same, cathode active matetial for non-aqueous electrolyte secondary battery and method for manufacturing same, and non-aqueous electrolyte secondary battery

A method for manufacturing a cathode active material for a non-aqueous electrolyte secondary battery that includes a lithium nickel cobalt composite oxide having a layered structure that is expressed by a general formula:

• LiuNi1-x-y-zCoxAlyMgz(OH)2 (where 1.00≤u≤1.04, 0.05≤x≤0.20, 0.01≤y≤0.06, and 0.01≤z≤0.03) and that includes secondary particles having a solid structure that are formed by an aggregate of plural primary particles, comprising:
• a mixing step for obtaining a lithium mixture by mixing an aluminum-coated nickel cobalt composite hydroxide with a lithium compound, wherein
• the aluminum-coated nickel cobalt composite hydroxide consists of Ni1-x-y-zCoxAlyMgz(OH)2 (where, 0.05≤x≤0.20, 0.01≤y≤0.06, and 0.01≤z≤0.03), and includes secondary particles, wherein
• the secondary particles have a structure in which a main part has a solid structure that is formed by an aggregate of plural primary particles and in which nickel, cobalt, and magnesium are uniformly dispersed, the main part coated by a coating film that includes aluminum or an aluminum compound;
• and
• the average particle size of the secondary particles being within the range 4 μm to 7 μm or less, the tap density being 1.5 g/mL or greater, and the specific surface area being within the range 5.5 m2/g to 7.5 m2/g;
• and
• a calcination step for obtaining a lithium nickel cobalt containing composite oxide by calcining the lithium mixture in an oxidizing atmosphere in which the oxygen concentration is 98% by volume or greater.