| 摘要 |
PROBLEM TO BE SOLVED: To produce a carbon material having a small amount of carbon fine powder attached thereto, capable of increasing a conductivity because of many points of mutual tangency of the fine particles, and useful as a carbon material for a negative electrode of a Li secondary battery having a large service capacity by graphitizing mesophase microspheres having specified contents of α, βand γ components at a prescribed temperature. SOLUTION: This carbon material is obtained by graphitizing mesophase microphones having >=88wt.%, preferably >=90wt.% α component, >=4wt.%, preferably 6-9wt.% β component and <=4wt.%, preferably <=3wt.% γ component, at >=2,500 deg.C. Preferably, an attaching amount of free carbon on the surface of the mesophase microspheres after regulating the particle sizes is decreased to <=10%, preferably <=5% in terms of the surface area by further pulverizing. Further, the powder is preferably formed into the one having >=0.6g/cm<3> bulk density and/or <=60mg/100g oil absorption and/or <=8m<2> /g specific surface area. |
