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Comparison between microparticles and nanostructured particles of FeSn2 as anode materials for Li-ion batteries

✍ Scribed by Mohamad Chamas; Pierre-Emmanuel Lippens; Jean-Claude Jumas; Kada Boukerma; Rémi Dedryvère; Danielle Gonbeau; Jusef Hassoun; Stefania Panero; Bruno Scrosati

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
636 KB
Volume
196
Category
Article
ISSN
0378-7753

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✦ Synopsis

The performances and mechanisms of two types of anodes formed by FeSn 2 microparticles and nanostructured FeSn 2 , respectively, were studied by Mössbauer spectroscopy and electrochemical testing. The specific capacity, which is within the range 400-600 mAh g -1 even at high C-rate, did not vary with cycle number over 50-60 cycles for the microparticles but progressively decreased for the nanostructured material. In the two cases, the first discharge consists in the irreversible transformation of FeSn 2 into Fe/Li 7 Sn 2 nanocomposite. The capacity fade is attributed to the growth and/or coalescence of the particles during cycling.

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Tin-containing nanometric and amorphous intermetallics and alloys are envisaged as negative electrodes for high-capacity lithium ion batteries. Nanocrystalline FeSn 2 has been prepared by reduction of Sn 2+ and Fe 3+ in tetraethylene glycol at 185 • C. Microcrystalline FeSn 2 has been prepared at 49