Directing Silicon鈥揋raphene Self-Assembly as a Core/Shell Anode for High-Performance Lithium-Ion Batteries

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• 作者：Yuanhua Zhu ; Wen Liu ; Xinyue Zhang ; Jinchao He ; Jitao Chen ; Yapei Wang ; Tingbing Cao
• 刊名：Langmuir
• 出版年：2013
• 出版时间：January 15, 2013
• 年：2013
• 卷：29
• 期：2
• 页码：744-749
• 全文大小：412K
• 年卷期：v.29,no.2(January 15, 2013)
• ISSN：1520-5827

文摘

There is great interest in utilization of silicon-containing nanostructures as anode materials for lithium-ion batteries but usually limited by manufacturing cost, their intrinsic low electric conductivity, and large volume changes during cycling. Here we present a facile process to fabricate graphene-wrapped silicon nanowires (GNS@Si NWs) directed by electrostatic self-assembly. The highly conductive and mechanical flexible graphene could partially accommodate the large volume change associated with the conversion reaction and also contributed to the enhanced electronic conductivity. The as-prepared GNS@Si NWs delivered a reversible capacity of 1648 mAh路g^鈥? with an initial Coulombic efficiency as high as 80%. Moreover, capacity remained 1335 mAh路g^鈥? after 80 cycles at a current of 200 mA路g^鈥?, showing significantly improved electrochemical performance in terms of rate capability and cycling performance.