Crystal structures and electrochemical properties of LiNi 1-xMgxO2 (0 ≤ x ≤ 0.1) for cathode materials of secondary lithium batteries

Deok Hyeong Kim; Yeon Uk Jeong

doi:10.3365/KJMM.2010.48.03.262

Crystal structures and electrochemical properties of LiNi _1-xMg_xO₂ (0 ≤ x ≤ 0.1) for cathode materials of secondary lithium batteries

Deok Hyeong Kim, Yeon Uk Jeong

Kyungpook National University

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

LiNi_1-xMg_xO2 (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-xMg_xO₂ 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-xMg_xO₂. The thicknesses of NiO₂ 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-xMg _xO₂ samples were around 10^-2 S/cm at room temperature. The electrochemical performances of LiNi_1-xMg _xO₂ were evaluated by coin cell test. Compared to LiNiO₂, LiNi_0.95Mg_0.05O₂ exhibited improved highrate capability and cyclability due to the well-ordered layered structure by doping of Mg ion.

Original language	English
Pages (from-to)	262-267
Number of pages	6
Journal	Journal of Korean Institute of Metals and Materials
Volume	48
Issue number	3
DOIs	https://doi.org/10.3365/KJMM.2010.48.03.262
State	Published - Mar 2010

Keywords

Chemical synthesis
Electrochemistry
Energy storage materials
Lithium-ion batteries
X-ray diffraction

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10.3365/KJMM.2010.48.03.262

Cite this

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title = "Crystal structures and electrochemical properties of LiNi 1-xMgxO2 (0 ≤ x ≤ 0.1) for cathode materials of secondary lithium batteries",

abstract = "LiNi1-xMgxO2 (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-xMgxO2 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 LiNi1-xMgxO2. The thicknesses of NiO2 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 LiNi1-xMg xO2 samples were around 10-2 S/cm at room temperature. The electrochemical performances of LiNi1-xMg xO2 were evaluated by coin cell test. Compared to LiNiO2, LiNi0.95Mg0.05O2 exhibited improved highrate capability and cyclability due to the well-ordered layered structure by doping of Mg ion.",

keywords = "Chemical synthesis, Electrochemistry, Energy storage materials, Lithium-ion batteries, X-ray diffraction",

author = "Kim, {Deok Hyeong} and Jeong, {Yeon Uk}",

year = "2010",

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AU - Kim, Deok Hyeong

AU - Jeong, Yeon Uk

PY - 2010/3

Y1 - 2010/3

N2 - LiNi1-xMgxO2 (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-xMgxO2 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 LiNi1-xMgxO2. The thicknesses of NiO2 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 LiNi1-xMg xO2 samples were around 10-2 S/cm at room temperature. The electrochemical performances of LiNi1-xMg xO2 were evaluated by coin cell test. Compared to LiNiO2, LiNi0.95Mg0.05O2 exhibited improved highrate capability and cyclability due to the well-ordered layered structure by doping of Mg ion.

AB - LiNi1-xMgxO2 (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-xMgxO2 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 LiNi1-xMgxO2. The thicknesses of NiO2 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 LiNi1-xMg xO2 samples were around 10-2 S/cm at room temperature. The electrochemical performances of LiNi1-xMg xO2 were evaluated by coin cell test. Compared to LiNiO2, LiNi0.95Mg0.05O2 exhibited improved highrate capability and cyclability due to the well-ordered layered structure by doping of Mg ion.

KW - Chemical synthesis

KW - Electrochemistry

KW - Energy storage materials

KW - Lithium-ion batteries

KW - X-ray diffraction

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