Mechanically alloyed composite anode materials based on SiO-Sn xFeyCz for Li-ion batteries

Bo Liu, Ali Abouimrane, Dennis E. Brown, Xiaofeng Zhang, Yang Ren, Zhigang Zak Fang, Khalil Amine

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A new family of composite materials as anodes for lithium-ion batteries, SiO-SnxFeyCz (x:y:z molar ratio), was synthesized by mechanical alloying. SiO is preferable because of its high capacity and the Sn-Fe-C alloys could be used as a buffer material to extend the cycle life of cells. Rather than expensive and toxic cobalt, we selected cheap and environmentally benign iron instead. The aim of this work is to find the optimal point by tuning the composition of Sn-Fe-C in the hope of obtaining better electrochemical performance. Different combinations were studied by high-energy X-ray diffraction and electrochemical methods. The results indicated that carbon can improve the cycle life, the amount of iron affects phase formation greatly, and the FeSn2 phase should be avoided because of its detrimental effect on cycle life. The 50 wt% SiO-50 wt% Sn 30Fe30C40 composition was studied using the pair distribution function and Mössbauer spectroscopy. This material exhibits high specific capacity (900 mA h g-1 at C/6 rate) with good cycle life and rate capability. These results indicate that SiO-Sn xFeyCz are promising candidate anode materials for commercial rechargeable lithium batteries.

Original languageEnglish
Pages (from-to)4376-4382
Number of pages7
JournalJournal of Materials Chemistry A
Volume1
Issue number13
DOIs
Publication statusPublished - 7 Apr 2013
Externally publishedYes

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ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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