Nanocrystalline Fe1-xCoxSn2 solid solutions prepared by reduction of salts in tetraethylene glycol

Nwokeke, Uche G., Chadwick, Alan V., Alcantara, Ricardo, Alfredsson, Maria, Tirado, Jose L. (2011) Nanocrystalline Fe1-xCoxSn2 solid solutions prepared by reduction of salts in tetraethylene glycol. Journal of Alloys and Compounds, 509 (6). pp. 3074-3079. ISSN 0925-8388. (doi:10.1016/j.jallcom.2010.11.202) (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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Abstract

In an effort to improve the electrochemical performance of tin intermetallic phases as electrode active material for lithium-ion batteries, Fe1?xCoxSn2 solid solutions with x = 0.0, 0.25, 0.3, 0.5, 0.6 and 0.8 were prepared by chemical reduction in tetraethylene glycol. Precise control of the synthesis conditions allowed single-phase nanocrystalline materials to be prepared, with particle diameters of about 20 nm and cubic, nanorods, and U-shaped morphologies. The substitution of iron by cobalt induced a contraction of the unit cell volume. The hyperfine parameters of the 57Fe Mössbauer spectra were sensitive to the Co/Fe substitution and revealed a superparamagnetic behaviour. In lithium cells nanocrystalline Fe1?xCoxSn2 active materials delivered reversible capacities above 500 mAh g?1 that depended on the composition and cycling conditions. The intermediate compositions exhibit better electrochemical performance than the end compositions CoSn2 and FeSn2.

Item Type: Article
DOI/Identification number: 10.1016/j.jallcom.2010.11.202
Uncontrolled keywords: Cobalt tin intermetallic compound; Iron tin intermetallic compound; Lithium batteries anode; Mössbauer 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 11:32 UTC
Last Modified: 29 May 2019 14:58 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49980 (The current URI for this page, for reference purposes)
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