Characterization of LiFePO4/C Cathode for Lithium Ion Batteries

Abstract : LiFePO4/C was synthesized from a mixture of different precursors of Li, Fe, and C by solid-state reaction. The initial mixture obtained was heated in different calcination conditions under inert atmosphere. The precursor of LiFePO4 doped with carbon was studied using different techniques such as thermal analysis, chemical and physical characterizations, and Mosbauer spectroscopy. A calculation of the crystallinity of the final product with two different methods is also presented. The chemical analysis techniques used were IRTF, XRD, and SEM. This characterization confirmed that we obtained a well-crystallized LiFePO4/C in all the operating conditions tested. The SEM showed aggregation and sintering during the calcination process, which were confirmed by the particle-size distribution measurements and by the physical characterizations. Mosbauer spectroscopy was used to determine the quantity of Fe(II) and Fe(III) contained in the final product. Our calcination conditions did not significantly modify the quantity of the two oxidation states.
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Nathalie Lyczko, Ange Nzihou, Patrick Sharrock, Alain Germeau, Claudia Toussaint. Characterization of LiFePO4/C Cathode for Lithium Ion Batteries. Industrial and engineering chemistry research, American Chemical Society, 2012, 51 (1), p.292-300. ⟨10.1021/ie201799x⟩. ⟨hal-01634016⟩

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