NOVELTY - An electrode material is formed using carbon electrode active material composite particles covered with carbonaceous film comprising carbonaceous material formed by thermal decomposition of organic compound, on the surface of electrode active material particles. The coverage of carbonaceous film in the surface of electrode active material particles is 60% or more. The film thickness of carbonaceous film is 0.1-10 nm. The standard rate constant of oxidation-reduction reaction of ferrocene which occurs on the surface of composite particles is 1x 10-5 cm/second or more.    USE - Electrode material is used for lithium-ion battery. Uses include but are not limited to portable telephone-apparatus, notebook-type personal computer, plug-in hybrid motor vehicle, hybrid vehicle, and electric tool.    ADVANTAGE - The electrode material has high electroconductivity. The carbonaceous film is uniformly and firmly formed on the surface of electrode active material. The lithium-ion battery containing the electrode material has high charge/discharge capacity.    DETAILED DESCRIPTION - An electrode material is formed using carbon electrode active material composite particles comprising carbonaceous material on the surface of electrode active material particles. The carbon electrode active material composite particles are covered with carbonaceous film comprising carbonaceous material formed by thermal decomposition of organic compound, on the surface of electrode active material particles. The coverage of carbonaceous film in the surface of electrode active material particles is 60% or more. The film thickness of carbonaceous film is 0.1-10 nm. The standard rate constant of oxidation-reduction reaction of ferrocene which occurs on the surface of carbon electrode active material composite particles is 1x 10-5 cm/second or more. An INDEPENDENT CLAIM is included for manufacture of electrode material, which involves preparing slurry by mixing precursor of electrode active material, or electrode active material, organic compound and surface modifying agent, spraying slurry, drying, and calcining obtained granules in non-oxidizing atmosphere.