| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for preparing a carbon material for a negative electrode of a lithium ion secondary cell which can stably prepare the carbon material for the negative electrode of the lithium ion secondary cell and which has a high discharge capacity at unit volume of the cell. SOLUTION: A method for preparing a carbon material for a negative electrode of a lithium ion secondary cell comprising graphitization of a carbonate obtained after a carbonization of an organic material comprises using, as an organic material, 1 or 2 or more of materials selected from (A) a coal tar, (B) a petroleum tar, (C) a coal tar pitch, (D) a petroleum pitch, (E) a mesophase microphase formed by heating a coal tar pitch, (F) a bulk meso-phase and (G) a mesophase containing pitch obtained by polymerizing condensed polycyclic aromatic hydrocarbon, preserving the hydrocarbon before graphitization in an atmosphere which does not contain substantially oxygen, and carrying out graphitization of the hydrocarbon after preservation.
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