| 리튬 2차 전지용 LiCo1-XMgxO2(x=0.03)의 결정구조, 전기전도도 및 전기화학적 특성 |
| 김호진, 정우창1, 정연욱, 이준형, 김정주 |
경북대학교 무기재료공학과
1부산대학교 동남권 부품소재 산학협력혁신사업단 |
| Crystal Structures, Electrical Conductivities and Electrochemical Properties of LiCo1-XMgxO2(x=0.03) for Secondary Lithium Ion Batteries |
| Ho-Jin Kim, Uoo-Chang Chung1, Yeon-Uk Jeong, Joon-Hyung Lee, Jeong-Joo Kim |
Department of Inorganic Materials Engineering, Kyungpook National University
1Industrial Liaison Innovation Cluster, Pusan National University |
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| ABSTRACT |
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[ $LiCoO_{2}$ ] 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 $LiCoO_2$. |
| Key words:
Lithium-cobalt-oxide, Mg doping, Structure, Cycling performance |
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