Journal
SCRIPTA MATERIALIA
Volume 69, Issue 1, Pages 96-99Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2013.02.015
Keywords
Antisite defects; Phospho-olivine; FTIR; HRTEM; Nanomaterials
Categories
Funding
- DST [SR/NM/NAT-02/2005]
- Nissan Research Support Program
- National Science Foundation Major Research Instrumentation Program [0521315]
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We report on the suppression of Fe-Li(center dot) antisite defects in LiFe(PO4)(1-x)F-3x with 0 <= x <= 0.4 prepared by sol-gel and hydrothermal methods. Evidence for a systematic suppression of antisite defects upon fluorine doping in LiFePO4 is inferred from Fourier transform infrared spectra, wherein a noticeable red shift in the symmetric P-O stretching vibrational mode of (PO4)(3-) polyanion from 970 to 957 cm(-1) was observed. We report detailed structural and compositional studies of LiFe(PO4)(1-x)F-3x, and discuss the implications for the performance of LiFePO4 cathodes in lithium ion batteries. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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