Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Crystal Structures and Electrochemical Properties of LiNi1-xMgxO2 (0≤x≤0.1) for Cathode Materials of Secondary Lithium Batteries

리튬 이차전지의 양극 활물질 LiNi1-xMgxO2 (0≤x≤0.1)의 결정구조 및 전기화학적 특성

  • Kim, Deok-Hyeong (School of Materials Science and Engineering, Kyungpook National University) ;
  • Jeong, Yeon Uk (School of Materials Science and Engineering, Kyungpook National University)
  • 김덕형 (경북대학교 신소재공학부) ;
  • 정연욱 (경북대학교 신소재공학부)
  • Received : 2009.08.31
  • Published : 2010.03.20
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Abstract

$LiNi_{1-x}Mg_xO_2$(x=0, 0.025, 0.05, 0.075, 0.1) samples were synthesized by the solid-state reaction method. The crystal structure was analyzed by X-ray powder diffraction and Rietveld refinement. $LiNi_{1-x}Mg_xO_2$samples give single phases of hexagonal layered structures with a space group of R-3m. The calculated cation-anion distances and angles from the Rietveld refinement were changed with Mg contents in $LiNi_{1-x}Mg_xO_2$. The thicknesses of $NiO_2$ slabs were increased and the distances between the $NiO_2$ slabs were decreased with the increase in Mg contents in the samples. The electrical conductivities of sintered $LiNi_{1-x}Mg_xO_2$ samples were around $10^{-2}$ S/cm at room temperature. The electrochemical performances of $LiNi_{1-x}Mg_xO_2$were evaluated by coin cell test. Compared to $LiNiO_2$, $LiNi_{0.95}Mg_{0.05}O_2$ exhibited improved high-rate capability and cyclability due to the well-ordered layered structure by doping of Mg ion.

Keywords

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