METHOD FOR PREPARING POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, AND POSITIVE ELECTRODE ACTIVE MATERIAL PREPARED THEREBY FOR LITHIUM SECONDARY BATTERY

The present invention relates to a positive electrode active material containing a lithium transition metal oxide in the form of a secondary particle in which primary particles are aggregated, wherein a zirconium-containing coating film is formed on the surface of the lithium transition metal oxide secondary particle and at the interface between the primary particles present inside the secondary particle, and a production method thereof.