Journal
MATERIALS LETTERS
Volume 70, Issue -, Pages 189-192Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2011.11.108
Keywords
Mixed oxides; Lithium diffusion; Sol-gel; XPS; EIS
Funding
- CONICYF (Fondecyt) [1110755]
- MICINN [MAT2009-14578-CO3-01]
- CSIC/USACH
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Li, Co and Ni mixed oxides of composition LiNixCo2-xO4 (x = 0.25, 0.5, 0.75 and 1) were prepared at 280 degrees C by the Pechini sol-gel method. The Rietveld refinement of the X-ray diffraction data indicated that all the obtained compounds crystallize in the Fd3m space group characteristic of cubic spinel-related oxides. XPS studies on these oxides reveal the presence of Ni2+, Ni3+, Co3+ and Co4+ ions at the surface. The diffusion coefficients of the Li+ ion in the oxide lattice, determined by EIS measurements, are larger (10(-13) cm(2)s(-1) <= D <= 10(-10) cm(2)s(-1)) than that shown by the non-substituted cobalt-lithium oxide, LiCo2O4 (D = 10(-16) cm(2)s(-1)) and present similar values to those of layered oxides of related composition. (C) 2011 Elsevier B.V. All rights reserved.
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