POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE ACTIVE MATERIAL SLURRY, POSITIVEELECTRODE, LITHIUM-ION SECONDARY BATTERY AND METHOD FOR PREPARING POSITIVE ELECTRODE ACTIVEMATERIAL

The present disclosure relates to a positive electrode active material for a lithium-ion secondary battery having excellent cycle characteristics at high temperature. The positive electrode active material for a lithium-ion secondary battery includes a lithium transition metal oxide, and an iodine-containing material at least partially covering the particles of the lithium transition metal oxide and containing iodine having an oxidation number of +3 to +7.