Specific Capacitance Characteristics of Electric Double Layer Capacitors with Phenol Based Activated Carbon Fiber Electrodes and Organic Electrolytes

페놀계 활성탄소섬유 전극과 유기성 전해질을 사용하는 전기이중층 캐패시터의 비축전용량 특성

  • Received : 1998.04.13
  • Accepted : 1999.09.13
  • Published : 1999.10.10

Abstract

The specific capacitance characteristics which were of the electric double layer capacitors(ELDC) made of phenol based activated carbon fiber(ACF) electrodes and organic electrolytes has been investigated with respect to different specific surface area of electrodes and different kinds of organic electrolytes. Throughout charge-discharge cell tests, it has been found that larger surface area and larger pore diameter of electrodes contribute to increase the specific capacitance. Binary mixture of organic solvent with propylene cabonate(PC) and tetrahydrofuran(THF) for 1 M-$LiClO_4$ electrolyte has a higher specific capacitance than single solvent of PC or mixed solvent with PC and diethyl cabonate(DEC). Also, even though 1 M-tetraethylamonium perchlorate(TEAPC) of organic electrolyte shows higher specific capacitance, it has longer charge time because of its lower ion mobility.

Keywords

activated carbon fiber;carbon electrode;electric double layer capacitor;organic electrolytes;supercapacitor

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