POSITIVE ELECTRODE ACTIVE MATERIAL CONTAINING LITHIUM COMPOSITE OXIDE AND COVERING MATERIAL AND BATTERY

A positive electrode active material includes a lithium composite oxide containing: at least one element selected from the group consisting of fluorine, chlorine, nitrogen, sulfur, bromine, and iodine; and a covering material that covers a surface of the lithium composite oxide. The lithium composite oxide has a crystal structure that belongs to a space group R-3m. The ratio |/|of a first integrated intensity ||of a first peak corresponding to a (003) plane to a second integrated intensity ||of a second peak corresponding to a (104) plane in an XRD pattern of the lithium composite oxide satisfies 0.62≤|/|≤0.90. The covering material has an electron conductivity of 10S/m or less