Conductive Rigid Skeleton Supported Silicon as High-Performance Li-Ion Battery Anodes

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• 作者：Xilin Chen ; Xiaolin Li ; Fei Ding ; Wu Xu ; Jie Xiao ; Yuliang Cao ; Praveen Meduri ; Jun Liu ; Gordon L. Graff ; Ji-Guang Zhang
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：August 8, 2012
• 年：2012
• 卷：12
• 期：8
• 页码：4124-4130
• 全文大小：408K
• 年卷期：v.12,no.8(August 8, 2012)
• ISSN：1530-6992

文摘

A cost-effective and scalable method is developed to prepare a core鈥搒hell structured Si/B₄C composite with graphite coating with high efficiency, exceptional rate performance, and long-term stability. In this material, conductive B₄C with a high Mohs hardness serves not only as micro/nano-millers in the ball-milling process to break down micron-sized Si but also as the conductive rigid skeleton to support the in situ formed sub-10 nm Si particles to alleviate the volume expansion during charge/discharge. The Si/B₄C composite is coated with a few graphitic layers to further improve the conductivity and stability of the composite. The Si/B₄C/graphite (SBG) composite anode shows excellent cyclability with a specific capacity of 822 mAh路g^鈥? (based on the weight of the entire electrode, including binder and conductive carbon) and 94% capacity retention over 100 cycles at 0.3 C rate. This new structure has the potential to provide adequate storage capacity and stability for practical applications and a good opportunity for large-scale manufacturing using commercially available materials and technologies.

Keywords:

Silicon; anode; rigid skeleton; shell+structure&qsSearchArea=searchText">core鈭抯hell structure; lithium-ion batteries; energy storage; boron carbide