COATED ACTIVE MATERIAL, COATED ACTIVE MATERIAL PRODUCTION METHOD, POSITIVE ELECTRODE MATERIAL AND BATTERY

A coated active material of the present disclosure includes: a positive electrode active material; lithium carbonate present on a surface of the positive electrode active material; and a coating layer coating at least a portion of the surface of the positive electrode active material. The coating layer includes a lithium-containing fluoride. When a mass of the lithium carbonate present on the surface of the positive electrode active material is measured by neutralization titration, a proportion R1 of the mass of the lithium carbonate in a mass of the positive electrode active material is 0.43% or more and 1.4% or less.