Journal
MATERIALS LETTERS
Volume 65, Issue 9, Pages 1323-1326Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2011.01.074
Keywords
Composite materials; Grain boundaries; Lithium-ion batteries; Lithium iron phosphate; Nonstoichiometry; Li3PO4
Funding
- Natural Science Foundation of Yunnan Province [2009ZC001X]
- analysis and testing foundation of Kunming University of Science and Technology [2010199]
- Key Lab of Advanced Materials in Rare & Precious and Non-ferrous Metals, Ministry of Education, KMUST
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Lithium iron phosphate (LiFePO4) was synthesized by a solid-state reaction from a nonstoichiometric mixture of starting materials with an iron: phosphorus excess ratio of 2:1 at a high temperature. The nonstoichiometry synthesis did not affect conductive Fe2P formation, lattice constants of LiFePO4 and materials morphology, but could effectively suppress insulating Li3PO4 impurity formation which was clearly observed in the stoichiometric sample. Our results demonstrate that the positive effect of the conductive Fe2P could be masked by the insulating Li3PO4 impurity presence, and the creation of Fe2P without Li3PO4 formation from carbothermal reduction could be successfully achieved by our nonstoichiometry synthesis. (C) 2011 Elsevier B.V. All rights reserved.
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