High-pressure synthesis of solid solutions between trigonal LiNiO2 and monoclinic Li[Li1/3Ni2/3]O2 |
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Authors: | Elitza Shinova Radostina Stoyanova |
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Affiliation: | a Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Bldg. 11, BG-1113 Sofia, Bulgaria b Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany c Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK |
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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 115 GHz and magnetic susceptibility measurements. The crystal structure of Li[LixNi1−x]O2 , , changes from trigonal R-3m to monoclinic C2/m at Li-to-Ni ratio of 2 (or ). 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 Li1/3Ni2/3-arrangment of the end Li[Li1/3Ni2/3]O2 composition. The charge distribution in these oxides proceeds via Ni3+ and Ni4+ ions. |
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Keywords: | Lithium nickelates High-pressure synthesis in oxygen atmosphere Electron paramagnetic resonance |
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