Abstract
High-pressure synthesis in an oxygen-rich atmosphere yields solid solutions between LiNiO2 and Li2NiO3 over the whole concentration range. Structural characterization of the high-pressure oxides was performed using powder XRD, SEM analysis, IR spectroscopy, EPR spectroscopy at 9.23 and 115GHz and magnetic susceptibility measurements. The crystal structure of Li[LixNi1-x]O-2, 0 ≤ x ≤ 1/3, changes from trigonal R-3m to monoclinic C2/m at Li-to-Ni ratio of 2 (orx = 1/3). The incorporation of Li into NiO2-layers causes a decrease in the mean Li-O and Ni1-xLix-O bond distance. Li and Ni ions in the mixed Ni1-xLixO2-layers display a tendency to order at a short length scale in such a way that mimics the Li1/3N2/3-arrangment of the end Li[Li1/3M2/3]O-2 composition. The charge distribution in these oxides proceeds via Ni3+ and Ni4+ ions. © 2005 Elsevier Inc. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 1661-1669 |
| Number of pages | 9 |
| Journal | Journal of Solid State Chemistry |
| Volume | 178 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - May 2005 |
Keywords / Materials (for Non-textual outputs)
- lithium nickelates
- high-pressure synthesis in oxygen atmosphere
- electron paramagnetic resonance
- ELECTRODE MATERIALS
- LITHIUM BATTERIES
- CATHODE MATERIALS
- LI2MNO3
- OXIDES
- EPR
- DIFFRACTION
- PERFORMANCE
- MN