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Korean Chemical Engineering Research,
Vol.52, No.1, 52-57, 2014
Vol.52, No.1, 52-57, 2014
Core-shell 구조의 MCMB/Li4Ti5O12 합성물을 사용한 하이브리드 커패시터의 전기화학적 특성
Electrochemical Characteristics of Hybrid Capacitor using Core-shell Structure of MCMB/Li4Ti5O12 Composite
본 연구에서는 낮은 사이클 안정성을 갖는 MCMB의 단점을 향상시키기 위하여 높은 사이클 안정성과 부피팽창이 없는 장점을 갖는 물질인 Li4Ti5O12를 코팅하여 core-shell 구조의 MCMB/Li4Ti5O12를 합성하고 MCMB-Li4Ti5O12를 음극으로, LiMn2O4, Active carbon fiber를 양극으로 사용하여 단위 셀을 제조하였다. LiPF6 염과 EC/DMC/EMC 용매를 전해질로 사용하여 제조한 하이브리드 커패시터 단위 셀로 충방전, 사이클, 순환전압전류, 임피던스 테스트를 진행하여 전기화학적 특성을 평가한 결과, MCMB-Li4Ti5O12/LiMn2O4 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-Li4Ti5O12 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-Li4Ti5O12 as the negative electrode and LiMn2O4, Active carbon fiber as the positive electrode. The electrochemical behaviors of hybrid capacitor using organic electrolytes (LiPF6, EC/DMC/EMC) were characterized by charge/discharge, cyclic voltammetry, cycle and impedance tests. The hybrid capacitor using MCMB-Li4Ti5O12/LiMn2O4 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.
Keywords:
Meso Carbon Microbeads; Li4Ti5O12; Core-shell Structure; Surface Modification; Hybrid Capacitor
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