| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject carbon fiber suitable for an organic solvent-based electric double layer capacitor, in which an electric double layer capacitor made by using the carbon fiber demonstrates higher service capacity than the conventional electric double layer capacitor. SOLUTION: This is a mesophase pitch-based activated carbon fiber having a BET specific surface area of 500m<2> /g or more. The carbon fiber is obtained by homogeneously mixing a mesophase pitch-based thermoset fiber or a mesophase pitch-based carbon fiber with an alkali metal compound in an amount of 0.5-5 times by weight, in which the carbon fiber is mildly carbonized at a temperature not higher than 800 deg.C after thermosetting, and subsequently treating it by heating at a temperature of 550-900 deg.C. |
