Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Performance of Nanosized Fe3O4 and CuO Supported on Graphene as Anode Materials for Lithium Ion Batteries

그래핀에 담지된 Fe3O4와 CuO 나노입자의 리튬이차전지 음극성능

  • Jeong, Jae-Hun (School of Chemical Engineering & Bioengineering, University of Ulsan) ;
  • Jung, Dong-Won (School of Chemical Engineering & Bioengineering, University of Ulsan) ;
  • Han, Sang-Wook (School of Chemical Engineering & Bioengineering, University of Ulsan) ;
  • Kim, Kwang-Hyun (School of Chemical Engineering & Bioengineering, University of Ulsan) ;
  • Oh, Eun-Suok (School of Chemical Engineering & Bioengineering, University of Ulsan)
  • 정재훈 (울산대학교 생명화학공학부) ;
  • 정동원 (울산대학교 생명화학공학부) ;
  • 한상욱 (울산대학교 생명화학공학부) ;
  • 김광현 (울산대학교 생명화학공학부) ;
  • 오은석 (울산대학교 생명화학공학부)
  • Received : 2011.11.08
  • Accepted : 2011.11.28
  • Published : 2011.11.30
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Abstract

In this study, $Fe_3O_4$/graphene and CuO/graphene composites were synthesized by the polyol reduction method using ethylene glycol, and their performances as the anodes of lithium ion batteries were evaluated. The physical characteristics of the synthesized composites were analyzed by SEM, XRD, and TGA. In addition, their electrochemical properties were examined by the electrochemical analysis techniques such as charge/discharge performance, cyclic voltammetry, and AC impedance spectroscopy. The cells composed of $Fe_3O_4$/graphene and CuO/graphene composites showed better performance than the graphene electrode, due to the dispersion of nanosized $Fe_3O_4$ or CuO on the surface of graphene and the formation of good electrical network in the electrode. Their composites kept the reversible capacity more than 600 mAh/g even after the charging/discharging of 30 cycles.

본 연구에서는 에틸렌글리콜을 사용한 polyol reduction 방법으로 나노크기의 $Fe_3O_4$와 CuO가 각각 그래핀에 분산된 $Fe_3O_4$/graphene, CuO/graphene 복합체를 합성하였으며, 이를 리튬이차전지의 음극활물질로 사용한 전극의 성능을 평가하였다. 합성된 복합체의 물리적 특성은 SEM, XRD, TGA 등으로 분석하였으며, 반쪽전지를 제조하여 충/방전, cyclic voltammetry, 교류 임피던스 등의 전기화학적 특성평가를 수행하였다. 그래핀 표면에 분산된 금속산화물 나노입자들에 의한 용량증가 및 전기적 네트워크 향상 등의 효과로 $Fe_3O_4$/graphene 및 CuO/graphene 복합체의 전극성능이 그래핀 전극보다 우수하였다. 복합체의 경우 30회 충/방전 후에도 600 mAh/g 용량을 유지하였다.

Keywords

References

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