| 摘要 |
A carbon material for a secondary cell which is prepared by holding a specific petroleum-based heavy oil under a pressure of 2.0 MPa at a temperature of 400 to 600°C for 3 hours or more, to thereby form a precursor of the carbon material, and subjecting the precursor to a heat treatment at 800 to 1500°C; a precursor of the carbon material; and a nonaqueous electrolyte secondary cell which uses, as a negative electrode active material, the above carbon material or another preferable carbon material prepared by further subjecting the above carbon material to an oxidizing treatment in nitrogen, argon, or a mixed gas thereof containing an oxidizing gas or the in the atmosphere at 200 to 1000°C. The nonaqueous electrolyte secondary cell uses a carbon material prepared from a petroleum-based heavy oil being available at a low cost, has a high capacity, and is excellent in cycle characteristics at a high temperature. |
