Journal
APPLIED SURFACE SCIENCE
Volume 256, Issue 8, Pages 2563-2568Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2009.10.105
Keywords
LiFePO4; Pulsed laser deposition; Conductive substrates
Categories
Funding
- Ministerio de Educacion y Ciencia [PTR95.0939.01, MAT2007-66737-C02-01, MAT2007-64486-C07-05]
- Universidad del Pais Vasco/Euskal Herriko Unibertsitatea [GIU06-11]
- CEGASA GROUP
- [GIC07/126-IT-312-07]
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Well crystallized and homogeneous LiFePO4/C (LFPO) thin films have been grown by pulsed laser deposition (PLD). The targets were prepared by the sol-gel process at 600 degrees C. The structure of the polycrystalline powders was analyzed with X-ray powder diffraction (XRD) data. The XRD patterns were indexed having a single phase olivine structure (Pnma). LFPO thin films have been deposited on three different substrates: aluminum(Al), stainless steel (SS) and silicon(Si) by pulsed laser deposition(PLD). The structure of the films was analyzed by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and atomic force microscopy (AFM). It is found that the crystallinity of the thin films depends on the substrate temperature which was set at 500 degrees C. When annealed treatments were used, secondary phases were found, so, one step depositions at 500 degrees C were made. Stainless steel is demonstrated to be the best choice to act as substrate for phosphate deposition. LiFePO4 thin films grown on stainless steel plates exhibited the presence of carbon, inducing a slight conductivity enhancement that makes these films promising candidates as one step produced cathodes in Li-ion microbatteries. (C) 2009 Elsevier B.V. All rights reserved.
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