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Search / Korean Journal of Chemical Engineering
Korean Chemical Engineering Research,
Vol.55, No.4, 467-472, 2017
고분자-알칼리 전해질이 코팅된 Poly(acrylonitrile) 분리막을 적용한 활성탄 수퍼커패시터 특성
Electrochemical Properties of Activated Carbon Supecapacitor Adopting Poly(acrylonitrile) Separator Coated by Polymer-Alkaline Electrolytes
김광만, 이영기, 고장면
Poly(acrylonitrile) (PAN) 부직포 분리막 상에 poly(ethylene oxide) (PEO), poly(vinyl alcohol)(PVA), potassium poly(acrylate) (PAAK)의 각 고분자와 6 M KOH로 조성된 전해질을 코팅하고 이를 활성탄 수퍼커패터에 적용하여 고분자 종류에 따른 전기화학적 특성을 조사하였다. 특징적으로 PEO와 PVA는 그 고분자 사슬의 자체구조로 인해 알칼리 전해액 성분 (KOH)과의 상호작용이 활성적이지 않은데 반하여, PAAK는 3 wt% 함량만으로도 사슬 및 곁사슬에 분포하는 COO-K+ 이온쌍과 전해액 내 해리되어 있는 K+ 및 OH- 이온들과의 상호작용이 활성으로 진행되어하이드로겔을 형성하며, 이것이 이온전도 및 수퍼커패시터의 전기화학적 특성에 큰 영향을 주었다. 과적으로 PAAKKOH전해질/PAN 분리막으로 포함한 활성탄 수퍼커패시터가 가장 우수한 축전용량 (100 mV s-1에서46.8Fg-1)을 나타내었다.
Alkaline electrolytes consisting of 6 M KOH and polymer (PEO, PVA, and PAAK) are coated on PAN nonwoven fabrics as a separator, and the electrochemical properties of the activated carbon supercapacitor adopting them are investigated in terms of redox behavior, specific capacitance, and interfacial impedance. Although the interaction between polymer and KOH are comparatively inactive in PEO and PVA, PAAK (3 wt.%)-KOH forms a hydrogel phase by active interactions between COO-K+ in side-chain of PAAK and K+OH- from alkaline electrolyte solution, improving ionic conduction of electrolytes and the electrochemical properties of the supercapacitor. As a result, the activated supercapacitor adopting the PAAK-KOH shows the superior specific capacitance of 46.8 F g-1 at 100 mV s-1.
Keywords: Polymer-alkaline electrolyte; Potassium poly(acrylate); Poly(acrylonitrile) separator; Activated carbon supercapacitor; Specific capacitance
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[Cited By]
  1. Kaushal I, Maken S, Sharma AK, Korean Chemical Engineering Research, 56(5), 694, 2018
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