Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Electrochemical Behavior of Li4Ti5O12/CNT Composite for Energy Storage

  • Kim, Hong-Il (Dept. of Industrial Engineering Chemistry, Chungbuk National University) ;
  • Yang, Jeong-Jin (Dept. of Industrial Engineering Chemistry, Chungbuk National University) ;
  • Kim, Han-Joo (Dept. of Industrial Engineering Chemistry, Chungbuk National University) ;
  • Osaka, Tetsuya (Graduate School of Science and Engineering, Waseda University) ;
  • Park, Soo-Gil (Dept. of Industrial Engineering Chemistry, Chungbuk National University)
  • Received : 2010.01.29
  • Accepted : 2010.02.17
  • Published : 2010.11.30
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Abstract

The $Li_4Ti_5O_{12}$/CNT composite is prepared by ultrasound associated sol-gel method. The prepared composite is characterized by SEM, TEM, XRD and TG analysis, and their electrochemical behaviors are investigated by cyclic voltammetry, electrochemical impedance spectroscopy and charge-discharge test in 1M $LiBF_4$/PC electrolyte. From the results, it is identified that the $Li_4Ti_5O_{12}$ nanoparticles coated on CNT surface have regular size with around 10~30 nm and spinel-framework structure. At the current rate of 20C, the discharge capacities of $Li_4Ti_5O_{12}$/CNT composites with CNT contents of 15, 30 and 50 wt% are 57, 63 and $48mAhg^{-1}$, respectively, which have similar value. The improved electrochemical behavior of the $Li_4Ti_5O_{12}$/CNT composite electrode is attributed to the addition of CNT with electronic conductivity.

Keywords

References

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