| 摘要 |
PURPOSE:To enhance energy efficiency and to lengthen charge-discharge cycle life by using a carbon material having pseudographite crystal structure, in which <002> interplanar distance obtained by X-ray wide angle analysis is specified and the amount of total acidic functional groups, BET surface area, and the number of surface bonding nitrogen atoms are specified. CONSTITUTION:A carbon material having pseudographite crystal structure in which <002> interplanar distance is 3.70Angstrom or less, and the amount of total acidic functional group, BET surface area, and the ratio of surface bonding nitrogen atoms to carbon atoms (N/C) are specified is used. The amount of total acidic functional group is 0.01meq/g or more, the BET surface area is 1m<2>/g or more, and the ratio of nitrogen to carbon (N/C) is 1.0% or more. As the raw material of the carbon material, coal pitch, oil pitch, phenol family, acrylic family, aromatic polyamide family, or cellulose family material is used. The carbon material having high N/C ratio is obtained by carbonizing the raw material containing rich nitrogen atoms such as acrylic family and aromatic polyamide family material. |
