전기이중층 커패시터의 분극성 전극물질로서 전도성 개량제의 첨가없이 상용 시제품 활성탄 및 왕겨 활성탄과 PVdF 단일 및 PVdF-PVP 복합결합제를 이용하여 전극을 제조한 후 물리화학적 특성 및 전기화학적 특성을 조사하였다. 왕겨 활성탄은 PVdF-PVP 복합결합제를 사용할 경우 PVP의 개공제 역할 때문에 중간세공이 발달된 이상적인 전극을 제조할 수 있었고 도전성 개량제를 첨가하지 않고도 에너지밀도 7.9Wh/kg, 비정전용량 33.5 F/g, ESR 0.7 Ω 및 자기방전율이 우수한 특성을 갖는 커패시터를 제조할 수 있었으며 기존의 상업화된 YP-17, BP-20 활성탄 전극에 비교하여 우수한 전극특성을 나타내었다.

High surface area and high pore volume activated carbon was prepared by KOH activation of rice hull. The elec-trodes were fabricated by compounding the commercial and rice hull activated carbons with PVdF and PVdF-PVP mixed bind-ers without addition of conductivity improver. The electrodes fabricated with rice hull activated carbon and PVdF-PVP mixed binders showed the best performance because the PVP played as a pore-forming agent. The electrode exhibited excellent elec-trochemical characteristics having 7.9 W · h/kg of energy density, 33.5 F/g of specific capacitance, 0.7 Ω of ESR and good effi-ciency of self discharge compared with that fabricated with commercial activated carbons.

Electric Double Layer Capacitor Rice Hull Activated Carbon Electrode PVdF and PVdF-PVP Mixing Binder Energy Density

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