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 hydrogen 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 hydrogen carbonate present on the surface of the positive electrode active material () is measured by thermogravimetry-mass spectrometry, a proportion R of the mass of the lithium hydrogen carbonate in a mass of the positive electrode active material () is 130 ppm or more and 580 ppm or less.