| Title |
Crystal Structures and Electrochemical Properties of LiNi(1-X)Mg(X)O2 (0≤x≤0.1) for Cathode Materials of Secondary Lithium Batteries |
| Authors |
김덕형(Deok Hyeong Kim); 정연욱(Yeon Uk Jeong) |
| DOI |
https://doi.org/10.3365/KJMM.2010.48.03.262 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
energy storage materials; chemical synthesis; electrochemistry; X-ray diffraction; Lithium-ion batteries |
| Abstract |
LiNi(1-x)Mg(x)O2 (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(x)O2 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(x)O2. The thicknesses of NiO2 slabs were increased and the distances between the NiO2 slabs were decreased with the increase in Mg contents in the samples. The electrical conductivities of sintered LiNi(1-x)Mg(x)O2 samples were around 10-2 S/cm at room temperature. The electrochemical performances of LiNi(1-x)Mg(x)O2 were evaluated by coin cell test. Compared to LiNiO2, LiNi0.95Mg0.05O2 exhibited improved high-rate capability and cyclability due to the well-ordered layered structure by doping of Mg ion. |