POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY

摘要

The present invention provides a positive electrode active material comprising a nickel-based lithium oxide expressed by Chemical Formula 1, wherein said nickel-based, lithium transition metal oxide has nickel content of 40% or higher and has a surface coated with a polymer having a melting point of 80~300°C. The lithium secondary battery containing the positive electrode active material according to the present invention is advantageous in that high temperature safety is improved without degrading electrical conductivity, thus enabling the lithium secondary battery to effectively exert a high capacity thereof.