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http://dx.doi.org/10.4191/KCERS.2005.42.9.602

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

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)
Publication Information
Journal of the Korean Ceramic Society / v.42, no.9, 2005 , pp. 602-606 More about this Journal
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
Lithium-cobalt-oxide; Mg doping; Structure; Cycling performance;
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