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Korean Carbon Society (한국탄소학회)
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Study on electrochemical performances of sulfur-containing graphene nanosheets electrodes for lithium-sulfur cells

  • Son, Ki-Soo (School of Chemical and Biochemical Engineering, Pusan National University) ;
  • Kim, Seok (School of Chemical and Biochemical Engineering, Pusan National University)
  • Received : 2014.01.21
  • Accepted : 2014.03.15
  • Published : 2014.04.30
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Abstract

Due to their morphology, electrochemical stability, and function as a conducting carbon matrix, graphene nanosheets (GNS) have been studied for their potential roles in improving the performance of sulfur cathodes. In this study, a GNS/sulfur (GNS/S) composite was prepared using the infiltration method with organic solvent. The structure, morphology and crystallinity of the composites were examined using scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The electrochemical properties were also characterized using cyclic voltammetry (CV). The CV data revealed that the GNS/S composites exhibited enhanced specific-current density and ~10% higher capacity, in comparison with the S-containing, activated-carbon samples. The composite electrode also showed better cycling performance for multiple charge/discharge cycles. The improvement in the capacity and cycling stability of the GNS/S composite electrode is probably related to the fact that the graphene in the composite improves conductivity and that the graphene is well dispersed in the composites.

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References

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