Patent ID: 11949102
Assignee: SUMITOMO METAL MINING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 3:
4. A method for manufacturing a positive electrode active material precursor for a nonaqueous electrolyte secondary battery, wherein the positive electrode active material precursor includes: a nickel-cobalt-manganese carbonate composite represented by general formula NixCoyMnzMtCO3 (where x+y+z+t=1, 0.05≤x≤0.3, 0.1≤y≤0.4, 0.55≤z≤0.8, 0≤t≤0.1, and M denotes at least one additional element selected from a group consisting of Mg, Ca, Al, Ti, V, Cr, Zr, Nb, Mo, and W); and a hydrogen-containing functional group, wherein H/Me representing a ratio of an amount of hydrogen (H) to an amount of metal components (Me) included in the positive electrode active material precursor is less than 1.60; wherein a secondary particle of the positive electrode active material precursor is formed by a plurality of primary particles of the positive electrode active material precursor that have been aggregated, the method comprising:
a nucleation step of forming nuclei in a mixed aqueous solution that is prepared by mixing together, under the presence of carbonate ions, an initial aqueous solution containing an ammonium ion supplier, an aqueous solution containing nickel as a metal component, an aqueous solution containing cobalt as a metal component, and an aqueous solution containing manganese as a metal component; and
a nucleus growth step of growing the nuclei formed in the nucleation step;
wherein a pH value of the mixed aqueous solution is controlled to be less than or equal to 7.5 at a reaction temperature of 40° C. as a standard temperature in the nucleation step, and
wherein the nucleation step and the nucleus growth step are performed in an atmosphere containing at least one of an inert gas and a carbon dioxide gas.