▎ 摘　　要

NOVELTY - A reduced graphene oxide-graphite composite material is obtained by complex conjugating reduced type graphene oxide and graphite, and has functional group ratio of a carbon-oxygen bond and carbonyl bond, obtained from the one carbon spectrum based on the surface analysis measured by the X-ray photoelectron spectroscopy, of 3-6. USE - Reduced graphene oxide-graphite composite material used for active material for negative electrode of lithium-ion secondary battery (claimed) in the form of coin-type, button-type, cylindrical-type, square-type, and laminated-type for electronic device. Uses include but are not limited to mobile telephone, notebook personal computer, tablet-type terminal, portable game machine, electric motorcycle, hybrid car, electric-power-assisted bicycle, conveyance, robot, cart for electric vehicle, domestic electrical storage system, uninterrupted power supply, photovoltaic power generation, wind power generation, and drone. ADVANTAGE - The reduced graphene oxide-graphite composite material provides battery having excellent charging and discharging characteristics, efficiency, and capacity retention rate. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) manufacture of the reduced graphene oxide-graphite composite material, which involves heat-processing graphene oxide with graphite; and (2) lithium-ion secondary battery, which comprises a positive electrode comprising positive electrode active material which occlude-discharging lithium ions, and a negative electrode comprising 10 %mass or more negative electrode active material which occlude-discharging lithium ions and comprising the reduced graphene oxide-graphite composite material, and a nonaqueous electrolyte.