Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Electrochemical Behavior of Lithium Titanium oxide/activated Carbon Composite for Electrochemical Capacitor

  • Yang, Jeong-Jin (Department of Industrial Engineering Chemistry, Chungbuk National University) ;
  • Kim, Hong-Il (Department of Industrial Engineering Chemistry, Chungbuk National University) ;
  • Yuk, Young-Jae (PureEchem Co., Ltd.) ;
  • Kim, Han-Joo (PureEchem Co., Ltd.) ;
  • Park, Soo-Gil (Department of Industrial Engineering Chemistry, Chungbuk National University)
  • Received : 2010.08.23
  • Accepted : 2010.09.30
  • Published : 2010.09.30
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Abstract

The $Li_4Ti_5O_{12}$/AC composite was prepared by sol-gel process with ultrasonication. The prepared composite was characterized by SEM, XRD and TG analysis, and their electrochemical behaviors were investigated by cyclic voltammetry, electrochemical impedance spectroscopy and charge-discharge test in 1M $LiBF_4$/PC electrolyte. From the results, the $Li_4Ti_5O_{12}$ particles coated on AC surface had an average particle size of 100 nm and showed spinel-framework structure. When the potential range of the $Li_4Ti_5O_{12}$/AC composite was extended from 0.1 to 2.5 V, redox peaks and electric double layer property were revealed. The initial discharge capacity of $Li_4Ti_5O_{12}$/AC composite was 218 mAh $g^{-1}$ at 1 C. The enhancement of discharge capacity was attributed to electric double layer of added activated carbon.

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