Abstract
A series of carbonaceous mesophase spherule/activated carbon composites were prepared as anode materials for super lithium ion capacitors using carbonaceous mesophase spherules as the core materials and pitch as the active carbon shell precursor. The structures of the composites were examined by scanning electron microscopy and X-ray diffractometry. The electrochemical performance was investigated in electric double layer capacitor and half-cell. The results show that, the composite exhibits good performance in both capacitor and battery with a high reversible capacity of 306.6 mA·h/g (0.2C) in the half-cell, along with a capacitance of 25.8 F/g in the capacitor when an optimum ratio of carbonaceous mesophase spherules to active carbon is adopted. The composite also shows a favorable rate performance and good cycle ability. A working model of this anode in super lithium ion capacitors was established.
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Foundation item: Project(2007BAE12B00) supported by the National Key Technology R&D Program of China; Project(50974136) supported by the National Natural Science Foundation of China
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Yang, J., Zhou, Xy., Li, J. et al. Carbonaceous mesophase spherule/activated carbon composite as anode materials for super lithium ion capacitors. J. Cent. South Univ. Technol. 18, 972–977 (2011). https://doi.org/10.1007/s11771-011-0789-0
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DOI: https://doi.org/10.1007/s11771-011-0789-0