Sodium Intercalation Mechanism of 3.8 V Class Alluaudite Sodium Iron Sulfate
| Autor: | Roberta Pigliapochi, Atsuo Yamada, Oliver Pecher, Clare P. Grey, Kent J. Griffith, Gosuke Oyama, Shin-ichi Nishimura |
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| Rok vydání: | 2016 |
| Předmět: |
inorganic chemicals
Reaction mechanism General Chemical Engineering Sodium Inorganic chemistry Intercalation (chemistry) chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 7. Clean energy Redox XANES 0104 chemical sciences Iron sulfate chemistry.chemical_compound chemistry Materials Chemistry 0210 nano-technology Solid solution |
| Zdroj: | Chemistry of Materials |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.6b01091 |
| Popis: | Alluaudite sodium iron sulfate Na2+2xFe2–x(SO4)3 is one of the most promising candidates for a Na-ion battery cathode material with earth-abundant elements; it exhibits the highest potential among any Fe3+/Fe2+ redox reactions (3.8 V vs Na/Na+), good cycle performance, and high rate capability. However, the reaction mechanism during electrochemical charging/discharging processes is still not understood. Here, we surveyed the intercalation mechanism via synchrotron X-ray diffraction (XRD), 23Na nuclear magnetic resonance (NMR), density functional theory (DFT) calculations, X-ray absorption near edge structure (XANES), and Mossbauer spectroscopy. Throughout charging/discharging processes, the structure undergoes a reversible, single-phase (solid solution) reaction based on a Fe3+/Fe2+ redox reaction with a small volume change of ca. 3.5% after an initial structural rearrangement upon the first charging process, where a small amount of Fe irreversibly migrates from the original site to a Na site. Sodium extr... |
| Databáze: | OpenAIRE |
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