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Korean Chemical Engineering Research,
Vol.45, No.2, 178-182, 2007
Vol.45, No.2, 178-182, 2007
LiMn2O4/C 복합 양극을 이용한 비수계 슈퍼커패시터의 제조
The Preparation of Non-aqueous Supercapacitors with LiMn2O4/C Composite Positive Electrodes
LiMn2O4와 활성탄을 양극의 활물질로 사용하여 비수계 슈퍼커패시터를 제조하고 LiMn2O4의 함량에 따른 특성을 분석하였다. Cyclic voltammetry, AC impedance 분석 등을 통하여, 활성탄의 전기 이중층으로 인한 capacitive 효과에 Li+ 이온의 intercalation/deintercalation에 의한 faradaic 효과가 더해진 pseudocapacitance의 발현을 확인할 수 있었으며, LiMn2O4의 함량이 증가할수록 비정전용량 및 에너지 밀도가 증가하는 것을 확인할 수 있었다. LiMn2O4:C의 비율이 0.86:0.14인 복합 양극을 사용하여, 순수 활성탄 양극 대비 2배 이상인 23.83 F/cc의 비정전용량과 17.51 Wh/L의 에너지밀도를 얻을 수 있었다. 또한, 1,000회 충방전 후에도 60% 이상 향상된 비정전용량과 에너지 밀도를 얻을 수 있었다.
Non-aqueous supercapacitors by using activated C and LiMn2O4 as an active material in a positive electrode were prepared and characterized. From the cyclic voltammetry and AC impedance analysis, the capacitive effect by electric double layer of activated carbon and the faradic effect by intercalation/deintercalation of Li+ ion were observed. Increasing the ratio of LiMn2O4, specific capacitances and energy densities of supercapacitor were increased. At the ratio of 0.86:0.14 (LiMn2O4:C), the maximum specific capacitance of 17.51 Wh/L and energy density of 23.83 F/cc were obtained, which were more than twice of those for a conventional electric double layer capacitor. Even after 1,000 charge/discharge cycle, the supercapacitor by using the electrode containing 14% of activated carbon and 86% of LiMn2O4 showed 60% better specific capacitance and energy density than that by using the electrode containing 100% activated carbon.
Keywords:
Supercapacitor; Non-aqueous; Composit Electrode; Lithium Manganese Oxide; Activated Carbon; High Energy Density; High Specific Capacitance
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