Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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A Study on Electrochemical Characteristics of LiCoO2/LiNi1/3Mn1/3Co1/3O2 Mixed Cathode for Li Secondary Battery

리튬2차전지용 LiCoO2/LiNi1/3Mn1/3Co1/3O2계 복합정극의 전기화학적 특성 연구

  • 김현수 (한국전기연구원 전지연구그룹) ;
  • 김성일 (한국전기연구원 전지연구그룹) ;
  • 엄승욱 (한국전기연구원 전지연구그룹) ;
  • 김우성 (대정화금(주) 중앙연구소)
  • Published : 2006.01.01
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Abstract

In this study, the $LiCoO_2/LiNi_{1/3}Mn_{1/3}Co_{1/3}O_2$ mixed cathode electrodes were prepared and their electrochemical performances were measured in a high cut-off voltage. As the content of $LiNi_{1/3}Mn_{1/3}Co_{1/3}O_2$ increased in a mixed cathode, the reversible specific capacity and cycleability of the electrode enhanced, but the rate capability was deteriorated. On the contrary the rate capability of the cathode enhanced, but the reversible specific capacity and cycleability were deteriorated, increasing the content of $LiCoO_2$ in the mixed cathode. The cell of $LiCoO_2/LiNi_{1/3}Mn_{1/3}Co_{1/3}O_2$ ($50:50 wt\%$) mixed cathode delivered a discharge capacity of ca. 168 mAh/g at a 0.2 C rate. The capacity of the cell decreased with the current rate and a useful capacity of ca. 152 mAh/g was obtained at a 2.0 C rate. However, the cell showed very stable cycleability: the discharge capacity of the cell after 20th charge/discharge cycling maintains ca. 163 mAh/g.

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References

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