Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Electrochemical Properties of Activated Carbon Supercapacitors Adopting Hydrophilic Silica and Hydrogel Electrolytes

친수성 실리카와 하이드로겔 전해질이 적용된 활성탄 수퍼커패시터의 전기화학적 특성

  • Lee, Hae Soo (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Park, Jang Woo (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Lee, Yong Min (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Ryou, Myung Hyun (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Kim, Kwang Man (Research Section of Power Control Devices, Electronics & Telecommunications Research Institute (ETRI)) ;
  • Ko, Jang Myoun (Department of Chemical and Biological Engineering, Hanbat National University)
  • 이해수 (한밭대학교 화학생명공학과) ;
  • 박장우 (한밭대학교 화학생명공학과) ;
  • 이용민 (한밭대학교 화학생명공학과) ;
  • 유명현 (한밭대학교 화학생명공학과) ;
  • 김광만 (한국전자통신연구원 정보통신부품소재연구소 전력제어소자연구실) ;
  • 고장면 (한밭대학교 화학생명공학과)
  • Received : 2015.10.12
  • Accepted : 2015.12.22
  • Published : 2016.06.01
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Abstract

A hydrogel electrolyte consisting of 6 M KOH aqueous solution, potassium polyacrylate (PAAK, 3 wt.%), and a hydrophilic silica OX50 (1 wt.%) was prepared to use as an electrolyte medium coated on a Scimat separator of activated carbon supercapacitor. The silica particle distributed homogeneously on surface pores of the separator to increase ionic conductivity and electrochemical stability of the hydrogel electrolyte. The silica addition also involved superior specific capacitance even at higher scan rates due to decrease in interfacial resistance between hydrogel electrolyte and activated carbon electrode.

6M의 KOH 수계 전해액에 potassium polyacrylate (PAAK)가 3 wt.% 포함된 하이드로겔 전해질을 제조하고, 이에 친수성 실리카 OX50을 1 wt.% 포함시킨 하이드로겔 전해질을 함께 제조하고, 이를 Scimat 분리막에 코팅 및 건조하여 활성탄 수퍼커패시터의 자기지지체 전해질/분리막으로 사용하여 그 실리카 첨가효과를 조사하였다. 실리카 입자는 다공성 분리막 지지체의 표면기공에 균일하게 분포하여 하이드로겔의 이온전도도와 전기화학적 안정성을 향상시켰으며 이에 따라 고속스캔 조건에서도 활성탄 수퍼커패시터의 비축전용량이 비교적 높게 유지되었는데, 이는 실리카가 포함된 하이드로겔 전해질이 활성탄 전극과 분리막 사이에서의 계면저항이 감소하기 때문이다.

Keywords

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