자외선 조사에 의한 고체 고분자 전해질의 제조와 이를 채용한 활성탄 수퍼커패시터의 전기화학적 특성
Preparation of Solid Polymer Electrolytes by Ultraviolet Radiation and the Electrochemical Properties of Activated Carbon Supercapacitor Adopting Them
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이온성 액체 전해질염 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4)과 용매 acrylonitrile (ACN) 및 propylene carbonate (PC)와 각각 혼합한 용액에 poly(ethylene glycol)diacrylate (PEGDA)를 45−60 wt.% 첨가하고 자외선 조사를 통해 경화시켜 고체 고분자 전해질 필름을 제조하였다. 이 고체 고분자 전해질 필름을 분리막으로 채택하고 활성탄 전극을 사용하는 수퍼커패시터를 제조하여 그 전기화학적 특성을 사이클릭 볼타메트리와 임피던스 방법으로 조사하였다. 결과적으로 PEGDA를 45 wt.% 첨가하여 제조한 고체 고분자 전해질 필름을 채택한 경우가 스캔속도 20 mVs−1에서 46 Fg−1의 가장 우수한 축전용량을 나타내는데, 이것은 PEGDA의 저함량 때문에 상대적으로 자외선 경화가 약하게 진행되어 고분자 전해질 필름의 유연성이 충분히 확보되므로 필름 내 이온전도가 가장 활발히 진행될 수 있었기 때문이다.
Abstract
Solid polymer electrolyte films are prepared by ultraviolet radiation in the mixtures of an ionic liquid salt (1-ethyl-3-methylimidazolium tetrafluoroborate, EMIBF4) and solvent (acetonitrile (ACN) or propylene carbonate(PC)), and an oligomer (poly(ethylene glycol)diacrylate, PEGDA, 45−60 wt.%). Electrochemical properties of activated carbon supercapacitors adopting the solid polymer electrolyte films as a separator are also examined by cyclic voltammetry and impedance measurement techniques. As a result, the supercapacitor adopting the PEGDA as much as 45 wt.% exhibits a superior capacitance of 46 Fg−1 at 20mVs−1. It seems that this is due to fast kinetics of ion conduction by sufficient film flexibility, which can be allowed by comparatively weak ultraviolet curing of small anount of the PEGDA.
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