A method of manufacturing a lithium ion secondary

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Provided is a method for producing a positive electrode active material that is obtained by uniformly covering a lithium-containing complex oxide with a predetermined amount of a compound without generating an impurity by a side reaction and that is capable of providing a lithium ion secondary battery having excellent cycle characteristics and excellent rate characteristics. A method for producing a positive electrode active material that is obtained by covering the surface of a lithium-containing complex oxide powder with an element X-containing compound that contains an element X (the element X is composed of at least one element selected from the group consisting of transition metals, alkali metals, alkaline earth metals, rare earth elements, halogens and Al). This method for producing a positive electrode active material for lithium ion secondary batteries forms a positive electrode active material that contains the element X-containing compound in an amount of 0.005-0.05 times the mole of the lithium-containing complex oxide by performing a covering step wherein an element X-containing solution that contains 0.001-0.05 mol/L of the element X-containing compound is sprayed over and dried on the lithium-containing complex oxide powder.