Method of manufacturing an electrode active material

Foreign substance generation and coverage defect of when the electrode active material surface to cover the ion conductive oxide, suppressing deterioration of the electrode active material, the electrode active material that enables higher output of the reduction and the battery of the battery resistance to provide a method and an electrode active material. Surface method for manufacturing a coated electrode active material with an ion conductive oxide, at least, the alkoxide compound, an alkoxide solution prepared by mixing a solute having at least one of liquid water or water of hydration and surface adsorbed water a preparation step of preparing a dry atmosphere, the alkoxide solution, a manufacturing method comprising a coating step of coating and drying the electrode active material surface, and as well, the surface of the electrode active material coated with ion conductive oxide there are, in the electrode active material surface, the area of ​​material occupied other than the ion conductive oxide, the electrode active material is not more than 21%.