Improving the cyclability of sodium-ion cathodes by selection of electrolyte solvent

Vidal-Abarca, C. and Lavela, Pedro and Tirado, Jose L. and Chadwick, Alan V. and Alfredsson, Maria and Kelder, E.M. (2012) Improving the cyclability of sodium-ion cathodes by selection of electrolyte solvent. Journal of Power Sources, 197 . pp. 314-318. ISSN 0378-7753. (doi:https://doi.org/10.1016/j.jpowsour.2011.09.008) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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http://www.dx.doi.org/10.1016/j.jpowsour.2011.09.0...

Abstract

A composite material containing orthorhombic Na1.8FePO4F and carbon is prepared by mechanical activation and ceramic procedures. The material is studied in sodium test cells as a potential candidate for sodium-ion battery cathodes. The effect of the solvents in the electrolyte on the electrochemical performance is analysed by X-ray absorption spectroscopy. The structural changes on cycling are small, while the changes in the oxidation state of iron agree with the sodium insertion–extraction processes. The oxidation state is especially affected by the upper limit of the voltage window, and the discharge capacity is strongly affected when using propylene carbonate solvent. Capacity and capacity retention are higher for sodium cells using mixtures of ethylene carbonate and diethyl carbonate as the solvent of NaPF6 electrolytes.

Item Type: Article
Uncontrolled keywords: Sodium-ion batteries; Sodium iron fluorophosphate; X-ray absorption spectroscopy
Subjects: Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 03 Aug 2015 11:33 UTC
Last Modified: 04 Aug 2015 08:38 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49979 (The current URI for this page, for reference purposes)
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