Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Electrochemical Properties of Activated Carbon Supecapacitor Containing Poly(acrylonitrile) Nonwoven Separator Coated by a Hydrogel Polymer Electrolyte

Poly(acrylonitrile) 부직포 분리막에 코팅된 하이드로겔 고분자 전해질을 포함하는 활성탄 수퍼커패시터 특성

  • Latifatu, Mohammed (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Ko, Jang Myoun (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Lee, Young-Gi (Research Section of Power Control Devices, Electronics & Telecommunications Research Institute (ETRI)) ;
  • Kim, Kwang Man (Research Section of Power Control Devices, Electronics & Telecommunications Research Institute (ETRI)) ;
  • Jo, Jeongdai (Research Section of Power Control Devices, Electronics & Telecommunications Research Institute (ETRI)) ;
  • Jang, Yunseok (Research Section of Power Control Devices, Electronics & Telecommunications Research Institute (ETRI)) ;
  • Yoo, Jung Joon (Department of Printed Electronics, Korea Institute of Machinery & Materials) ;
  • Kim, Jong Huy (Department of Printed Electronics, Korea Institute of Machinery & Materials)
  • 모하메드 라티파투 (한밭대학교 화학생명공학과) ;
  • 고장면 (한밭대학교 화학생명공학과) ;
  • 이영기 (한국전자통신연구원 부품소재연구부문 전력제어소자연구실) ;
  • 김광만 (한국전자통신연구원 부품소재연구부문 전력제어소자연구실) ;
  • 조정대 (한국전자통신연구원 부품소재연구부문 전력제어소자연구실) ;
  • 장윤석 (한국전자통신연구원 부품소재연구부문 전력제어소자연구실) ;
  • 유정준 (한국기계연구원 인쇄전자연구실) ;
  • 김종휘 (한국기계연구원 인쇄전자연구실)
  • Received : 2013.07.02
  • Accepted : 2013.08.04
  • Published : 2013.10.01
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Abstract

A hydrogel electrolyte consisting of potassium poly(acrylate) (PAAK) (3 wt%) in 6 M KOH aqueous solution is coated on poly(acrylonitrile) nonwoven separator to examine high-rate characteristics of activated carbon supercapacitor adopting the separator. The hydrogel is homogeneously coated on the surface pores of the nonwoven separator. The electrolyte uptake of the PAAK hydrogel maintains for 24 days higher than 230% and the coated separator shows slightly lower ionic conductivity ($2.9{\times}10^{-2}Scm^{-1}$) than that ($3.6{\times}10^{-2}Scm^{-1}$) of using 6 M KOH only. The activated carbon supercapacitor adopting the coated separator shows a specific capacitance higher than $27Fg^{-1}$ at $1000mVs^{-1}$ and a retention ratio higher than 97% after the 1000th cycle. This is due to strong interfacial contact of coated hydrogel electrolyte between the activated carbon electrode and the nonwoven separator.

6M KOH 수계 전해액에 potassium poly(acrylate) (PAAK)를 3 wt% 포함시켜 제조한 하이드로겔을 poly(acrylonitrile)부직포 분리막에 코팅하고, 이를 활성탄 수퍼커패시터의 분리막 및 전해질로 사용하여 수퍼커패시터의 고율특성 향상을 시도하였다. 이 분리막 및 전해질은전자현미경 관찰 결과 PAAK 하이드로겔이 부직포의 표면기공에 균일하게 코팅되어 있으며, 24일 동안 하이드로겔의 합습도가 230% 이상으로 균일하게 유지되었고, 6 M KOH 전해액을 사용한 경우($3.6{\times}10^{-2}Scm^{-1}$)보다 약간 낮은 $2.9{\times}10^{-2}Scm^{-1}$의 이온전도도를 나타내었다. 활성탄을 활물질로 사용한 대칭형 수퍼커패시터에 이 분리막 및 전해질을 채택한 경우 사이클릭볼타메트리 시험에서 $1000mVs^{-1}$의 고속스캔 조건에서도 $27Fg^{-1}$ 이상의 높은 비축전용량과 1000 사이클 경과후에도 97% 이상의 유지율을 나타내는데, 이는 부직포 상에 코팅된 PAAK 하이드로겔 전해질이 활성탄 전극과 부직포 분리막 사이에서 강력한 계면밀착을 유지할 수 있기 때문이다.

Keywords

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