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

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• 作者：Mohamad Chamas^a ; Pierre-Emmanuel Lippens^a ; ^{lippens@univ-montp2.fr"" rel=""nofollow} ; Jean-Claude Jumas^a ; Kada Boukerma^b ; Ré ; mi Dedryvè ; re^b ; Danielle Gonbeau^b ; Jusef Hassoun^c ; Stefania Panero^c ; Bruno Scrosati^c
• 关键词：FeSn₂ ; Anodes ; Li-ion ; M&#xf6 ; ssbauer spectroscopy ; Nanostructured material
• 刊名：Journal of Power Sources
• 出版年：2011
• 出版时间：15 August 2011
• 年：2011
• 卷：196
• 期：16
• 页码：7011-7015
• 全文大小：636 K

文摘

The performances and mechanisms of two types of anodes formed by FeSn₂ microparticles and nanostructured FeSn₂, 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 FeSn₂ into Fe/Li₇Sn₂ nanocomposite. The capacity fade is attributed to the growth and/or coalescence of the particles during cycling.