Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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The Preparation of Non-aqueous Supercapacitors with LiMn2O4/C Composite Positive Electrodes

LiMn2O4/C 복합 양극을 이용한 비수계 슈퍼커패시터의 제조

  • Kim, Kyoungho (School of Chemical Engineering and Materials Science, Chung-Ang University) ;
  • Yoo, Jeeyoung (School of Chemical Engineering and Materials Science, Chung-Ang University) ;
  • Kim, Minsoo (School of Chemical Engineering and Materials Science, Chung-Ang University) ;
  • Yeu, Taewhan (School of Chemical Engineering and Materials Science, Chung-Ang University)
  • 김경호 (중앙대학교 화학신소재공학부) ;
  • 유지영 (중앙대학교 화학신소재공학부) ;
  • 김민수 (중앙대학교 화학신소재공학부) ;
  • 여태환 (중앙대학교 화학신소재공학부)
  • Received : 2006.10.08
  • Accepted : 2006.11.06
  • Published : 2007.04.30
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Abstract

Non-aqueous supercapacitors by using activated C and $LiMn_2O_4$ 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 $LiMn_2O_4$, specific capacitances and energy densities of supercapacitor were increased. At the ratio of 0.86:0.14 ($LiMn_2O_4:C$), 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 $LiMn_2O_4$ showed 60% better specific capacitance and energy density than that by using the electrode containing 100% activated carbon.

$LiMn_2O_4$와 활성탄을 양극의 활물질로 사용하여 비수계 슈퍼커패시터를 제조하고 $LiMn_2O_4$의 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, $LiMn_2O_4$의 함량이 증가할수록 비정전용량 및 에너지 밀도가 증가하는 것을 확인할 수 있었다. $LiMn_2O_4:C$의 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.

Keywords

Acknowledgement

Supported by : 중앙대학교

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