▎ 摘　　要

NOVELTY - Preparing composite metal oxide involves preparing aqueous metal solution by selecting three metals among nickel, cobalt, iron, manganese, and aluminum, and obtaining precursor by adding precipitating agent and coprecipitating agent to the aqueous metal solution, introducing the resulting mixture into a continuous reactor, and stirring the mixture, and preparing a cathode active material by heat-treating the precursor along with a lithium salt and a heterogeneous element. USE - Method for preparing composite metal oxide used as precursor for carbon-coated cathode active material for lithium secondary battery (claimed). ADVANTAGE - The prepared carbon-coated cathode active material has improved electrical conductivity, improved charging/discharging cycle characteristics, lifespan characteristics, high rate characteristics, and replaced conventional cathode active material electrode substances for lithium secondary batteries. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: 1. a composite metal oxide serving as a precursor for a carbon-coated cathode active material for a lithium secondary battery is prepared by preparation method; 2. a method of preparing a carbon-coated cathode active material for a lithium secondary battery, which involves: (a) preparing an aqueous metal solution by selecting three types among nickel, cobalt, iron, manganese, and aluminum; (b) obtaining a precursor by mixing a precipitating agent and a coprecipitating agent with the aqueous metal solution; (c)introducing the mixture into a continuous reactor; (d)stirring the mixture; and (e) preparing a cathode active material by heat-treating the precursor along with a lithium salt and a heterogeneous element and by using graphene as a coating agent.