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Citation: CAI Min, LI Shengying, LI Zesheng, WANG Hongqiang, LI Qingyu. Application of Mesocarbon Microbead/Manganese Oxide Composite Electrodes in Supercapacitor[J]. Chinese Journal of Applied Chemistry, ;2011, 28(4): 414-420. doi: 10.3724/SP.J.1095.2011.00337 shu

Application of Mesocarbon Microbead/Manganese Oxide Composite Electrodes in Supercapacitor

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a Department of Resources Engineering, Guangxi Modem Vocational Technology College, Hechi;
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b School of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin 541004;
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c The State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou

Corresponding author: WANG Hongqiang,
Received Date: 10 June 2010
Available Online: 25 September 2010
Fund Project: 国家自然科学基金资助项目(20663001,200763002) (20663001,200763002)

A novel MnO₂/MSAC(micro-spherical activated carbon base on mesocarbon microbead) composite,which might be used as an electrode material in electrochemical capacitor,was prepared by dispersing thermally decomposed MnO₂ from manganese nitrates on MSAC.The morphology and crystal structure of the composite were investigated by scanning electron microscopy(SEM),transmission electron microscope(TEM) and X-ray diffraction(XRD),respectively.The electrochemical properties of the electrode were studied by cyclic voltammetry(CV),galvanostatic charge-discharge,and electrochemical impedance spectroscopy(EIS) in 1.0 mol/L LiPF₆.Our results showed that the MnO₂ particles dispersed on MSAC have particle size in the range of 100~160 nm,the initial specific capacitance of the MSAC/MnO₂ and single MSAC electrode are 186 F/g and 167 F/g respectively at 2×10^-3 A/cm² current density.The Coulombic efficiency of MnO₂/MSAC spherical compound materials capacitor remained above 95% after 200 charge and discharge cycles.In addition,the charge-discharge curve of the MSAC/MnO₂ electrode showed typical capacitive behavior with a good linearity,and the CV curve also showed good rectangular features,high energy density and good power performance.
- electrochemical capacitor,
- mesocarbon microbead,
- manganese oxide,
- composite electrode
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