Fabrication and microstructure of lithium nickel vanadium oxide prepared by solid-state reaction
Resource
Ceramics International 25 (5): 431-436
Journal
Ceramics International
Journal Volume
25
Journal Issue
5
Pages
431-436
Date Issued
1999
Date
1999
Author(s)
Liou, Shaw-Jang
Abstract
The synthesis process and microstructural evolution of LiNiVO4, a potential cathode material used in lithium ion secondary batteries, prepared by solid-state reaction have been investigated in this study. The formation processes of LiNiVO4 are characterized to be an initial dissociation of LiVO3·0.5H2O to form LiVO3, followed by a subsequent reaction between LiVO3 and NiO to produce LiNiVO4 from above 600 °C. After calcination at 700 °C for 6 h, monophasic LiNiVO4 has been successfully prepared. Further raising the temperature to 800 °C reduces the required heating time to 4 h. In comparison with the results in previous reports, the heating time for synthesizing LiNiVO4 is significantly reduced in the study. The microstructure of LiNiVO4 is found to markedly depend on the heating processes. Increasing heating temperature as well as soaking time results in non-uniform microstructure of the specimens. In the regions having nonstoichiometric composition, the microstructure of the specimens becomes well densified and experiences exaggerated grain-growth. The above phenomena imply that liquid-phase sintering has occurred in the above regions.
Type
journal article
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