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Abstract
Iron(iii) hydroxide phosphate hydrate Fe1.13(PO4)(OH)0.39(H2O)0.61 is investigated for the first time as a Na-ion battery cathode, which reveals that the material exhibits similar storage capacities for Na-and Li-ions at relatively low current rates (i.e. C/10). Interestingly, operando X-ray diffraction shows that insertion of Na-ions induces a solid solution transition in the crystalline Fe1.13(PO4)(OH)0.39(H2O)0.61 end-member simultaneously with a major amorphization. This result adds to the series of observations of phosphate-based materials undergoing order-disorder transitions during Na-ion storage. Fe1.13(PO4)(OH)0.39(H2O)0.61 is thus ideal for enhancing our knowledge on such phenomena. To this end, using total X-ray scattering with pair distribution function analysis, we show that the amorphous phase is Na-rich NaxFe1.13(PO4)(OH)0.39(H2O)0.61 with the local [FeO6]-[PO4] motif retained but with coherence lengths of only ca. 0.6 nm. Our investigation also reveals that the crystallinity of Fe1.13(PO4)(OH)0.39(H2O)0.61 is regained upon Na-extraction (battery recharge), i.e. the order-disorder transition is reversible.
Original language | English |
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Journal | Nanoscale |
Volume | 12 |
Issue number | 24 |
Pages (from-to) | 12824-12830 |
Number of pages | 7 |
ISSN | 2040-3364 |
DOIs | |
Publication status | Published - 2020 |
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Development of Novel Electrode Materials for Rechargeable Batteries
01/09/2018 → 31/08/2022
Project: PhD Project