| 摘要 |
PROBLEM TO BE SOLVED: To provide a carbon material excellent in charging and discharging characteristics, cycle properties, and load characteristics when it is used as an electrode, and to provide a negative electrode material for lithium-ion secondary batteries using the carbon material. SOLUTION: The carbon material is prepared by carbonizing a hardly-graphitizable carbon source. The method for producing the carbon material comprises a first heat treatment step of performing first heating using the hardly-graphitizable carbon source to obtain a carbon precursor and a second heat treatment step of performing second heating using the carbon precursor to obtain the carbon material. In the method for producing the carbon material, the carbon precursor has an elemental ratio of carbon:hydrogen of 7:3 to 9:1. The carbon material is obtained by the method for producing the carbon material as described above. The negative electrode material for lithium-ion secondary batteries comprises the carbon material. COPYRIGHT: (C)2009,JPO&INPIT
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