Korean Chemical Engineering Research

  • 제52권1호
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  • Pages.52-57
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  • 2014
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  • 0304-128X(pISSN)
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  • 2233-9558(eISSN)
한국화학공학회 (The Korean Institute of Chemical Engineers)
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Core-shell 구조의 MCMB/Li4Ti5O12 합성물을 사용한 하이브리드 커패시터의 전기화학적 특성

Electrochemical Characteristics of Hybrid Capacitor using Core-shell Structure of MCMB/Li4Ti5O12 Composite

  • 투고 : 2013.09.12
  • 심사 : 2013.12.19
  • 발행 : 2014.02.01
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초록

본 연구에서는 낮은 사이클 안정성을 갖는 MCMB의 단점을 향상시키기 위하여 높은 사이클 안정성과 부피팽창이 없는 장점을 갖는 물질인 $Li_4Ti_5O_{12}$를 코팅하여 core-shell 구조의 $MCMB/Li_4Ti_5O_{12}$를 합성하고 $MCMB/Li_4Ti_5O_{12}$를 음극으로, $LiMn_2O_4$, Active carbon fiber를 양극으로 사용하여 단위 셀을 제조하였다. $LiPF_6$ 염과 EC/DMC/EMC 용매를 전해질로 사용하여 제조한 하이브리드 커패시터 단위 셀로 충방전, 사이클, 순환전압전류, 임피던스 테스트를 진행하여 전기화학적 특성을 평가한 결과, MCMB-$Li_4Ti_5O_{12}/LiMn_2O_4$ 전극을 사용한 하이브리드 커패시터가 MCMB 전극의 하이브리드 커패시터 보다 좋은 충/방전 성능을 보였고, 67 Wh/kg, 781 W/kg의 에너지밀도와 출력밀도를 나타내었다.

The MCMB-$Li_4Ti_5O_{12}$ with core-shell structure was prepared by sol-gel process to improve low cycle capability of MCMB in this study. The electrochemical characteristics were investigated for hybrid capacitor using MCMB-$Li_4Ti_5O_{12}$ as the negative electrode and $LiMn_2O_4$, Active carbon fiber as the positive electrode. The electrochemical behaviors of hybrid capacitor using organic electrolytes ($LiPF_6$, EC/DMC/EMC) were characterized by charge/discharge, cyclic voltammetry, cycle and impedance tests. The hybrid capacitor using MCMB-$Li_4Ti_5O_{12}/LiMn_2O_4$ electrodes had better capacitance than MCMB hybrid systems and was able to deliver a specific energy with 67 Wh/kg at a specific power of 781 W/kg.

키워드

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  1. CNT를 첨가한 Silicon/Carbon 음극소재의 전기화학적 특성 vol.54, pp.1, 2014, https://doi.org/10.9713/kcer.2016.54.1.16
  2. 하이브리드 커패시터의 열안정성 개선을 위한 LiFePO4 복합양극 소재에 관한 연구 vol.55, pp.2, 2014, https://doi.org/10.9713/kcer.2017.55.2.242