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Expanded Graphite Negative Electrode for Lithium-ion Batteries

  • Yoo, Hyun-D. (Department of Chemical and Biological Engineering and WCU program of C2E2, Seoul National University) ;
  • Ryu, Ji-Heon (Graduate School of Knowledge-based Technology and Energy, Korea Polytechnic University) ;
  • Park, Seong-Ho (Department of Chemical and Biological Engineering and WCU program of C2E2, Seoul National University) ;
  • Park, Yu-Won (Department of Chemical and Biological Engineering and WCU program of C2E2, Seoul National University) ;
  • Ka, Bok-H. (Department of Chemical and Biological Engineering and WCU program of C2E2, Seoul National University) ;
  • Oh, Seung-M. (Department of Chemical and Biological Engineering and WCU program of C2E2, Seoul National University)
  • Received : 2011.02.13
  • Accepted : 2011.03.09
  • Published : 2011.03.31

Abstract

A series of expanded graphites is prepared from graphite oxide by changing the heat-treatment temperature, and their lithiation/de-lithiation mechanism and rate performance are examined. A featureless sloping profile is observed in their charge-discharge voltage and dilatometry profiles, which is contrasted by the stepwise plateau-like profiles observed with the pristine graphite. With an increase in the heat-treatment temperature from $250^{\circ}C$ to $850^{\circ}C$, the interlayer distance becomes smaller whereas the electric conductivity becomes larger, both of which are resulted from a removal of foreign atoms (mainly oxygen) from the interlayer gaps. The expanded graphite that is prepared by a heat-treatment at $450^{\circ}C$ delivers the best rate performance, which seems to be a trade-off between the $Li^+$ ion diffusivity that is affected by the interlayer distance and electrical conductivity.

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