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• W1988536184 endingPage "891" @default.
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• W1988536184 abstract "In the recent hunt for novel Na-ion cathode hosts, a variety of sodium analogues of classic Li-ion structures have been thoroughly explored. However, Na-ion analogues generally possess modified structures and dissimilar Na-ion energetics compared to their Li-ion analogues due to the large size of Na+ (102 pm) vs Li+ (76 pm), often resulting in sluggish Na+ kinetics. Materials development targeted toward new and different specific host structures possessing optimum properties for Na-ion migration is crucial. Here, we report the first sodium metal fluoropyrophosphate Na-ion host with a three-dimensional framework—Na4NiP2O7F2—which is predicted to have a high voltage (∼5 V) based on its Ni2+/3+/4+ redox couple and composition. Structure solution from single crystal diffraction data combined with atomistic simulation computation suggests the presence of low activation energy Na-ion migration pathways (<0.6 eV) in all three dimensions. The particularly low barrier of 0.36 eV calculated for migration along the [010] direction is in full accord with temperature dependent ionic conductivity measurements that yield an experimental value of 0.32 eV. Spacious Na-ion pathways endow the material with good ionic conductivity as determined by ac impedance spectroscopy, and facile exchange of three Na+ ions for Li+ is observed at slightly elevated temperatures. Furthermore, the polycrystalline material exhibits excellent thermal stability under ambient atmosphere up to 600 °C, crucial for the safe operation of a Na-ion battery." @default.
• W1988536184 created "2016-06-24" @default.
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• W1988536184 date "2015-01-20" @default.
• W1988536184 modified "2023-10-13" @default.
• W1988536184 title "Synthesis, Structure, and Na-Ion Migration in Na₄NiP₂O₇F₂: A Prospective High Voltage Positive Electrode Material for the Na-Ion Battery" @default.
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• W1988536184 doi "https://doi.org/10.1021/cm504058k" @default.
• W1988536184 hasPublicationYear "2015" @default.
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