Supercapacitor용 이온성 액체 전해질의 전기화학적 특성
Electrochemical Characteristics of Supercapacitor Using Ionic Liquid Electrolyte
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초록
수퍼커패시터는 다양한 응용범위를 갖는 유망한 에너지 저장장치로서 활발히 연구되고 있으며,에너지 밀도 향상을 위하여 이온성 액체의 적용이 필요하다. 본 연구에서는 4급화 반응과 음이온교환반응을 거쳐 4급 imidazolium 염을 생성하는 반응으로 두 종류의 EMI-BF_4를 합성하였다. ^(1)H-NMR을 통하여 EMI-BF_4의 합성을 확인하였고 TGA를 통하여 열적안정성을 확인하였으며,이때 합성된 이온성 액체를 열처리한 경우 열적 안정성이 향상되었다. LSV를 통하여 본 연구에서 합성한 EMI-BF4가 4 V 이상의 넓은 전위창을 가지고 있어, 기존의 전해질 대비 우수한 전기화학적 안정성을 가지고 있음을 확인하였다. 충방전 실험 결과 본 실험에서 합성한 이온성 액체를 상용화 제품과 비교한 경우 용량은 각각 0.067 F 및 0.073 F로 측정되었다.
Abstract
Supercapacitor has been studied actively as one of the most promising electrochemical energy storage system for a wide range of applications. To increase the energy density of supercapacitor,the introduction of ionic liquids is required. In this study, two types of EMI-BF_4based on quaternary imidazolium salt were prepared with quaternary reaction and anion exchange. The structural characterization and thermal stability were analyzed by nuclear magnetic resonance(^(1)H-NMR) and thermogravimetric analysis(TGA), respectively. Thermal stability of the EMI-BF_4 using TGA confirmed that, after heat treatment, the decomposition temperature of EMI-BF_4 was increased. Supercapacitors were fabricated with synthesized and commercial ionic liquids, and charge/discharge characteristics were also investigated. The capacity of supercapacitor,for synthesized and commercial EMI-BF_4 were determined to be 0.067 F and 0.073 F respectively,by means of charge/discharge test.
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