Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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The Preparation of Non-aqueous Supercapacitors with Lithium Transition-Metal Oxide/Activated Carbon Composite Positive Electrodes

  • Kim, Kyoung-Ho (LG Innotek) ;
  • Kim, Min-Soo (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Yeu, Tae-Whan (School of Chemical Engineering and Materials Science, Chung-Ang University)
  • Received : 2010.05.14
  • Accepted : 2010.09.06
  • Published : 2010.11.20
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Abstract

In order to increase the specific capacitance and energy density of supercapacitors, non-aqueous supercapacitors were prepared using lithium transition-metal oxides and activated carbons as active materials. The electrochemical properties were analyzed in terms of the content of lithium transition-metal oxides. The results of cyclic voltammetry and AC-impedance analyses showed that the pseudocapacitance may stem from the synergistic contributions of capacitive and faradic effects; the former is due to the electric double layer which is prepared in the interface of activated carbon and organic electrolyte, and the latter is due to the intercalation of lithium ($Li^+$) ions. The specific capacitance and energy density of a supercapacitor improved as the lithium transition-metal oxides content increased, showing 60% increase compared to those of supercapacitor using a pure activated carbon positive electrode.

Keywords

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