| 摘要 |
PURPOSE:To increase high rate charge-discharge efficiency and to decrease self-discharge rate by specifying pore volume to 0.7-1.5cc/g, and the volume of pore having a pore diameter of 30Angstrom or more or 17Angstrom or less, and also specifying the contents of ash, sodium, and potassium. CONSTITUTION:Activated carbon fibers are specified so that the pore volume is 0.7-1.5cc/g, and the volume of pores having a pore diameter of 30Angstrom or more or 17Angstrom or less is 30% or less, and also ash is 0.2% or less, and the contents of sodium and potassium are 20ppm or less and 10ppm or less respectively. IN order that the volume of pores having a pore diameter of 30Angstrom or more does not exceed 20% based on the total pore volume, activation time and activation temperature are controlled. Activated carbon fibers are washed with acid to remove ash so that the content of ash is 0.2% or less, sodium content is 20ppm or less and potassium content is 10ppm or less, then heated in an inactive atmosphere at 700-1,050 deg.C. By this heat treatment, pores having a pore diameter of 17Angstrom or less are decreased. |
