Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Crystal Structures, Electrical Conductivities and Electrochemical Properties of LiCo1-XMgxO2(x=0.03) for Secondary Lithium Ion Batteries

리튬 2차 전지용 LiCo1-XMgxO2(x=0.03)의 결정구조, 전기전도도 및 전기화학적 특성

  • Kim, Ho-Jin (Department of Inorganic Materials Engineering, Kyungpook National University) ;
  • Chung, Uoo-Chang (Industrial Liaison Innovation Cluster, Pusan National University) ;
  • Jeong, Yeon-Uk (Department of Inorganic Materials Engineering, Kyungpook National University) ;
  • Lee, Joon-Hyung (Department of Inorganic Materials Engineering, Kyungpook National University) ;
  • Kim, Jeong-Joo (Department of Inorganic Materials Engineering, Kyungpook National University)
  • 김호진 (경북대학교 무기재료공학과) ;
  • 정우창 (부산대학교 동남권 부품소재 산학협력혁신사업단) ;
  • 정연욱 (경북대학교 무기재료공학과) ;
  • 이준형 (경북대학교 무기재료공학과) ;
  • 김정주 (경북대학교 무기재료공학과)
  • Published : 2005.09.01
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Abstract

[ $LiCoO_{2}$ ] is the most common cathode electrode materials in Lithium-ion batteries. $LiCo_{0.97}Mg_{0.03}O_2$ was synthesized by the solid-state reaction method. We investigated crystal structures, electrical conductivities and electrochemical properties. The crystal structure of $LiCo_{0.97}Mg_{0.03}O_2$ was analyzed by X-ray powder diffraction and Rietveld refinement. The material showed a single phase of a layered structure with the space group R-3m. The lattice parameter(a, c) of $LiCo_{0.97}Mg_{0.03}O_2$ was larger than that of $LiCoO_2$. The electrical conductivity of sintered samples was measured by the Van der Pauw method. The electrical conductivities of $LiCoO_2$ and $LiCo_{0.97}Mg_{0.03}O_2$ were $2.11{\times}10^{-4}\;S/cm$ and $2.41{\times}10^{-1}\;S/cm$ at room temperature, respectively. On the basis of the Hall effect analysis, the increase in electrical conductivities of $LiCo_{0.97}Mg_{0.03}O_2$ is believed due to the increased carrier concentrations, while the carrier mobility was almost invariant. The electrochemical performance was investigated by coin cell test. $LiCo_{0.97}Mg_{0.03}O_2$ showed improved cycling performance as compared with $LiCoO_2$.

Keywords

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