레이온/폴리에틸렌옥사이드 분리막과 하이드로겔 전해질이 적용된 활성탄 수퍼커패시터 특성
Electrochemical Properties of Activated Carbon Supercapacitor Adopting Rayon/Poly(Ethylene Oxide) Separator and a Hydrogel Electrolyte
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초록
Rayon 분리막에 poly(ethylene oxide) (PEO)를 코팅하고 potassium polyacrylate (PAAK)- KOH 하이드로겔 전해질을 사용하여 기계적 강도 및 전기화학적 성질을 시험하였고, 이를 활성탄 수퍼커패시터에 적용하여 커패시터 특성을 조사하였다. PEO 코팅량의 증가에 따라 기계적강도는 증가하였으며, PEO 함량을 5 wt.% 이하로 유지하면 이온전도도가 10-2S cm-1 이상을 유지하여 실제 커패시터에의 활용이 가능하였다. 결과적으로 Rayon/PEO 분리막과 PAAK/KOH 전해질을 적용한 활성탄 수퍼커패시터는 1000 mV s-1의 높은 스캔속도에서도 비축적용량이1000 사이클까지 안정하게 나타나는데, 이는 PEO 코팅이 Rayon의 장섬유 필라멘트간 엉킴점을고정시켜 고출력 안정성을 얻을 수 있기 때문이다.
Abstract
The mechanical and electrochemical properties of poly(ethylene oxide) (PEO)- coated Rayon separator were characterized using potassium polyacrylate (PAAK)-KOH electrolyte. The supercapacitive properties of activated carbon supercapacitor adopting the Rayon/ PEO separator and PAAK-KOH electrolyte was also tested. As the PEO content increased, the mechanical strength increased. Room-temperature ionic conductivity of over 10-2 S cm-1 was obtained at the PEO content lower than 5 wt.%, applicable to a supercapacitor. As a result, the specific capacitance at 1000 mV s-1 of the activated carbon supercapacitor adopting the Rayon/PEO separator and PAAK-KOH electrolyte was highly stable after 1000th cycle. This was due to high rate-capability provided by the fact that PEO coating could fix the entanglements among fiber filaments of Rayon.
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