Positive electrode active material for lithium-ion battery, a positive electrode for lithium-ion battery, and lithium-ion battery

A manufacturing method for a positive electrode active material for lithium ion batteries, represented by composition formula:

• LixNi1−yMyO2+α, wherein
• M is Co as an essential component and at least one species selected from a group consisting of Sc, Ti, V, Cr, Mn, Fe, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B and Zr, 0.9≤x≤1.2, 0<y≤0.7, α>0.05, and
• an average particle size (D50) is 5 μm to 15 μm,
• comprising the steps of (1) to (5):
• (1) producing metal salt solution of Ni and at least one species selected from a group consisting of Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B and Zr,
• (2) suspending lithium carbonate in pure water, and then pouring the metal salt solution in the water to produce metal carbonate solution slurry,
• (3) filtering the metal carbonate solution slurry to produce a filtered lithium-containing carbonate, and then drying the lithium-containing carbonate to produce powders of a precursor for positive electrode active material for lithium ion batteries,
• (4) classifying the powders of a precursor for positive electrode active material for lithium ion batteries to produce powders having a particle size of 1 μm to 30 μm, and
• (5) conducting a calcination of the powders of a precursor for positive electrode active material for lithium ion batteries having a particle size of 1 μm to 30 μm to produce a positive electrode active material for lithium ion batteries.