NOVELTY - A carbon material comprises particles having laminated structure of multiple plates obtained from coking coal composition. The coking coal composition is obtained by the delayed coking method. The ratio of total of the generation rates of one-carbon hydrocarbon gas (1C gas),two-carbon hydrocarbon gas (2C gas) and a hydrogen gas generated by coking processing of heavy oils, over the formation rate of the coking coal composition is 0.30-0.60 %mass. The laminated structure of each plate is curved into a bow shape.    USE - Carbon material is used for negative electrode for lithium-ion secondary battery (claimed). Uses include but are not limited to electric vehicle, plug-in hybrid motor vehicles, notebook computer, mobile telephone, and electric power storage system.    ADVANTAGE - The lithium-ion secondary battery formed by the carbon material has excellent reliability, charge-and-discharge capacity, and charging-discharging cycling characteristics.    DETAILED DESCRIPTION - A carbon material comprises particles having laminated structure of multiple plates obtained from coking coal composition. The coking coal composition is obtained by the delayed coking method. The ratio of total of the generation rates of one-carbon hydrocarbon gas (1C gas), two-carbon hydrocarbon gas (2C gas) and hydrogen gas generated by coking processing of heavy oils, over the formation rate of the coking coal composition is 0.30-0.60 %mass. The laminated structure of each plate is curved into a bow shape. The ratio of average bow height including the plate thickness, and average thickness of the plate is 1.10-1.25. The average length of the plate in the vertical direction, and average thickness of the plate is 5 or more. INDEPENDENT CLAIMS are included for the following:    (1) manufacture of coking coal composition; and    (2) manufacture of carbon material, which involves pulverizing the coking coal composition to average particle diameter of 30 mu m or less, and carrying out carbonization process.