Si/Ni₃Si-Encapulated Carbon Nanofiber Composites as Three-Dimensional Network Structured Anodes for Lithium-ion Batteries

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• 作者：Peixin Zhang ; ^{pxzhang@szu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Liang Huang ; Yongliang Li ; ^{liyli@szu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiangzhong Ren ; Libo Deng ; Qiuhua Yuan
• 关键词：Electrospinning ; nanofiber ; alloy ; lithium ion batteries
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：20 February 2016
• 年：2016
• 卷：192
• 期：Complete
• 页码：385-391
• 全文大小：2491 K

文摘

Si/Ni₃Si-encapulated carbon nanofiber composites are synthesized by a facile one-pot electrospinning method and employed as three-dimensional network structured anode materials for lithium ion batteries. It is demonstrated that the composite exhibited increased cycling performance with a reversible capacity of 1132.4 mAh g⁻¹ after 200 cycles, which is 45% higher compared to the bare Si. The improved battery performance is attributed to the alloying of Si with Ni, which could effectively alleviate the volume expansion during lithium insertion/extraction. In addition, the formation of one dimensional nanofiber in which Si/Ni₃Si nanoparticles are well distributed not only increases the electronic conductivity, but also enhances the mechanical strength of the electrodes, resulting in increased cycle stability.