NOVELTY - A raw-coal composition obtained by caulking a heavy-oil composition by a delayed-coking process, is pulverized and classified to obtain a powder. A compression shearing stress is provided to the powder to obtain a carbide precursor. The carbide precursor is heated and carbonized in an inert atmosphere such that the size (Lc(002)) of microcrystal computed from (002) diffraction line measured by X-ray wide-angle diffraction method is 2-8 nm. The raw-coal composition has a hydrogen/carbon atomic ratio of 0.3-0.5, and a micro hardness of 7-17 %mass.    USE - Manufacture of amorphous type carbon material for negative electrodes of lithium ion secondary batteries (all claimed). Uses include but are not limited to motor vehicles, mobile telephones, notebook computers, hybrid vehicles, electric vehicles, plug-in hybrid vehicles, and electric power storage of system infrastructures.    ADVANTAGE - The method provides amorphous type carbon materials capable of suppressing capacity degradation accompanying repeated charge/discharge cycles, storage in a charged state, float-charging, etc. The obtained carbon material provides highly durable lithium ion secondary batteries.    DETAILED DESCRIPTION - A raw-coal composition obtained by carrying out caulking process of a heavy-oil composition by a delayed-coking process, is pulverized and classified to obtain powder of raw-coal composition. A compression shearing stress is provided to the powder to obtain a carbide precursor. The carbide precursor is heated and carbonized at 900-1500 degrees C in an inert atmosphere such that the size (Lc(002)) of microcrystal computed from (002) diffraction line measured by X-ray wide-angle diffraction method is 2-8 nm. The raw-coal composition has a hydrogen/carbon atomic ratio of 0.3-0.5, and a micro hardness of 7-17 %mass.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a cell.    Battery (10)    Positive electrode (11)    Positive-electrode collector (12)    Negative electrode (13)    Negative-electrode collector (14)