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LiFePO4 synthesized via melt synthesis using low-cost iron precursors
Authors:M. Talebi-Esfandarani  S. Rousselot  M. Gauthier  P. Sauriol  G. Liang  M. Dollé
Affiliation:1.Department of Chemistry,Université de Montréal,Montreal,Canada;2.Department of Chemical Engineering, école Polytechnique de Montréal,Montreal,Canada;3.Johnson Matthey Battery material Ltd,Candiac,Canada
Abstract:LiFePO4/C material has been prepared using fast-melt synthesis method followed by grinding and carbon coating. The low-cost iron ore concentrate (IOC) and purified iron ore concentrate (IOP) were used as iron precursors in the melt process to reduce significantly the cost of LiFePO4/C. The same product was also synthesized using pure Fe2O3 under similar conditions as reference. The physical-chemical and electrochemical properties of samples were investigated. The X-ray Diffraction (XRD) results confirm the formation of an olivine structure of LiFePO4 with a minor amount of Li3PO4 and Li4P2O7 impurities for all the samples but no Fe2P. The power performances of LiFePO4/C using low-cost iron precursors were close to the sample using pure Fe2O3 precursor although capacity in mAh g?1 is somewhat lower. With the inherent presence of silicon and other metals species, multi-substitution may take place when using IOC as source of iron leading to a Li(Fe1-yMy)(P1-xSix)O4 general composition. Multi-substitution, however, allows a better cycling stability. Therefore, these iron precursors present a promising option in this field to reduce the cost of a large-scale synthesis of LiFePO4/C for Li-ion batteries application.
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