Study of layered iron(III) phosphate phase Na3Fe3(PO4)4 used a positive electrode in lithium batteries
Résumé
The layered Na3Fe3(PO4)4 phase prepared by solid-state reaction was studied as positive electrode in lithium batteries. Up to 1.9 Li+ ions/f.u. could be intercalated, and only 1.7 Li+ ions could be extracted between 4.5 and 2 V vs Li+/Li with an average voltage of around ~2.8 V. In situ and ex situ X-ray diffraction data and Mössbauer spectroscopy measurements indicate that the intercalation/deintercalation process occurs through a solid solution process and is reversible. To improve its electrochemical performances, Na3Fe3(PO4)4 was also prepared via a hydrothermal method that leads to a significant particle size reduction. However, no clear improvements of the cycling performances were observed using this material as positive electrode in sodium and lithium batteries.
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