▎ 摘　　要

NOVELTY - A positive electrode active material is made of a nickel-based lithium transition metal oxide, and comprises at least one secondary particles comprising an aggregate of primary macroparticles, and a coating layer comprising a carbon material, positioned on the surface of the secondary particles. The secondary particles have an average particle diameter (D50) of 3-10 mu m. USE - Active material is used for positive electrode of lithium secondary battery (all claimed). Uses include but are not limited to mobile phones, notebook computers, electric vehicles, power tool, hybrid electric vehicle, and plug-in hybrid electric vehicle. ADVANTAGE - The positive electrode active material has reduced resistance and increased thermal stability compared to the existing secondary particles, and improved electroconductivity on the surface by coating the surface of the secondary particles with the conductive carbon material, thus producing lithium secondary battery with improved lifespan performance through minimization of loss of a conductive network after cycles. By smoothing the surface of the secondary particles having a large surface roughness according to the carbon material coating, the rolling density is increased, and generation of fine powder is reduced during rolling. Due to the use of the conductive carbon material, a separate conductive material is not be added when manufacturing the electrode and increases the amount of positive electrode active material included in the electrode, thus increasing energy density of the electrode. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of the positive electrode active material, which involves preparing a porous nickel-based lithium transition metal hydroxide precursor by mixing a precursor and a hydroxide containing nickel, cobalt and manganese, preparing secondary particles by mixing and heat-treating the porous nickel-based lithium transition metal hydroxide precursor and a lithium raw material, mixing the secondary particles and carbon material to form the coating layer. The primary macroparticles have an average particle diameter (D50) of 1.5 mu m or more.