Oxyfluorination of Pitch-based Activated Carbon Fibers for High Power Electric Double Layer Capacitor

고출력 전기이중층 캐패시터를 위한 핏치계 활성탄소섬유의 함산소불소화 처리

  • Received : 2017.08.14
  • Accepted : 2017.09.12
  • Published : 2017.12.10


Pitch based activated carbon fibers for electric double layer capacitor (EDLC) electrodes were treated by oxyfluorination via varying the ratio of fluorine and oxygen gases to improve high power property. As the partial pressure of fluorine increased, the oxyfluorinated activated carbon fibers showed an increase of linear fluorine functional groups. While the oxygen functional groups increased, no changes was observed with respect to the partial gas pressure. The specific surface area and pore volume decreased due to the etching reaction on the activated carbon fiber surface through oxyfluorination, but the mesopore volume increased about 4.5 times. In the case of activated carbon fibers treated with 50% of the fluorine gas partial pressure, the specific capacitance increased to about 29% and 61% at scan rates of 5 and 50 mV/s, respectively. The improvement of the specific capacitance was believed to be due to the introduction of oxygen and fluorine functional groups on the activated carbon fiber surface and the increase of mesopores through oxyfluorination.


EDLC;activated carbon fiber;oxyfluorination;high power property


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