Green Synthesis and Stable Li-Storage Performance of FeSi2/Si@C Nanocomposite for Lithium-Ion Batteries

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• 作者：Yao Chen ; Jiangfeng Qian ; Yuliang Cao ; Hanxi Yang ; Xinping Ai
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：July 25, 2012
• 年：2012
• 卷：4
• 期：7
• 页码：3753-3758
• 全文大小：401K
• 年卷期：v.4,no.7(July 25, 2012)
• ISSN：1944-8252

文摘

Si-based alloy materials have received great attention as an alternative anode for high capacity and safe Li-ion batteries, but practical implementation of these materials is hindered by their poor electrochemical utilization and cyclability. To tackle this problem, we developed a core鈥搒helled FeSi₂/Si@C nanocomposite by a direct ball-milling of Fe and Si powders. Such a nanostructured composite can effectively buffer the volumetric change by alloying active Si phase with inactive FeSi₂ matrix in its inner cores and prevent the aggregation of the active Si particles by outer graphite shells, so as to improve the cycling stability of the composite material. As a result, the FeSi₂/Si@C composite exhibits a high Li-storage capacity of 1010 mA g^鈥? and an excellent cyclability with 94% capacity retention after 200 cycles, showing a great promise for battery applications. More significantly, the synthetic method developed in this work possesses several advantages of low cost, zero emission, and operational simplicity, possibly to be extended for making other Li-storage alloys for large-scale applications in Li-ion batteries.

Keywords:

lithium ion battery; ball milling; Si anode; FeSi₂/Si alloy; core鈭抯hell structure; FeSi₂/Si@C Nanocomposite