Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Electrochemical Properties of LiCoO2 Prepared by Mechanochemical Process

Mechanochemical Process로 제조된 LiCoO2의 전기화학적 특성

  • Cho, Byung-Won (Battery Research Center, KIST) ;
  • Lee, Joong Kee (Battery Research Center, KIST) ;
  • Lee, Jae-Ryong (Department of Chemical and Biological Engineering, Korea University) ;
  • Kim, Su-Jin (Department of Chemical and Biological Engineering, Korea University) ;
  • Lee, Kwan-Young (Department of Chemical and Biological Engineering, Korea University) ;
  • Na, Byung-Ki (School of Chemical Engineering, Chungbuk National University)
  • 조병원 (KIST 이차전지연구센터) ;
  • 이중기 (KIST 이차전지연구센터) ;
  • 이재룡 (고려대학교 화공생명공학과) ;
  • 김수진 (고려대학교 화공생명공학과) ;
  • 이관영 (고려대학교 화공생명공학과) ;
  • 나병기 (충북대학교 화학공학부)
  • Received : 2007.10.30
  • Accepted : 2007.11.26
  • Published : 2008.02.28
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Abstract

Discharge capacity of $LiCoO_2$ in preparation by mechanochemical process decreased remarkably over 4.3V. However, Zr coating of $LiCoO_2$ showed very stable electrochemical properties up to 4.5V. Zr coating of $LiCoO_2$ in this experiment showed the discharge capacity of 197 mAh/g at 3.0-4.5V, and it maintained 96% of the initial discharge capacity after 50 cycle of charge/discharge.

Mechanochemical process로 제조된 $LiCoO_2$ 전극의 경우에 4.3 V 이상의 전위영역에서 용량감소현상이 두드러지게 나타난 반면에, Zr을 피복한 $LiCoO_2$의 경우에는 4.5 V의 전위에서도 안정성을 유지하였다. 본 연구에서 제작한 Zr이 피복된 $LiCoO_2$ 전극은 3.0~4.5 V 구간에서 197 mAh/g의 용량을 나타내었으며, 50 사이클 후에 96%의 방전용량을 유지하므로 전지의 안정성을 확보하였다.

Keywords

References

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