MANUFACTURING METHOD OF POSITIVE ELECTRODE ACTIVE MATERIAL, MANUFACTURING METHOD OF POSITIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, AND MANUFACTURING METHOD OF LITHIUM ION SECONDARY BATTERY

To provide a positive electrode active material capable of further improving the output characteristics and cycle characteristics of a lithium ion secondary battery, a manufacturing method of the positive electrode active material, a positive electrode for a lithium ion secondary battery including the positive electrode active material, and a lithium ion secondary battery having the positive electrode.SOLUTION: In a positive electrode active material containing Li, Ni, Co, Mn, and W, when the total of metal elements other than Li contained in the positive electrode active material is 100 mol%, the proportion of Ni is 30 mol% or more and 60 mol% or less, and the proportion of Co is 15 mol% or more and 35 mol% or less, the proportion of Mn is 15 mol% or more and 35 mol% or less, the proportion of W is more than 0 mol% and 5 mol% or less, and W is unevenly distributed on the surface layer of the positive electrode active material rather than inside the positive electrode active material, and does not include a W-containing crystalline compound.SELECTED DRAWING: None 【課題】リチウムイオン二次電池の出力特性およびサイクル特性をさらに向上できる正極活物質、該正極活物質の製造方法、該正極活物質を含むリチウムイオン二次電池用正極、および該正極を有するリチウムイオン二次電池の提供。【解決手段】Ｌｉ、Ｎｉ、Ｃｏ、ＭｎおよびＷを含む正極活物質であり、前記正極活物質に含まれるＬｉ以外の金属元素の合計を１００モル％としたとき、Ｎｉの割合が、３０モル％以上６０モル％以下であり、Ｃｏの割合が、１５モル％以上３５モル％以下であり、Ｍｎの割合が、１５モル％以上３５モル％以下であり、Ｗの割合が、０モル％超５モル％以下であり、Ｗが前記正極活物質の内部よりも前記正極活物質の表層に偏在しており、Ｗ含有結晶性化合物を含まない正極活物質。【選択図】なし