کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7850968 | 1508849 | 2016 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A honeycomb-cobweb inspired hierarchical core-shell structure design for electrospun silicon/carbon fibers as lithium-ion battery anodes
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The silicon/carbon (Si/C) hybrid fibers with a hierarchical core-shell structure are prepared by encapsulating Si nanoparticles in the interconnected hollow carbon fibers ([email protected]) based on a dual coaxial electrospinning technique. For the hierarchical structure, Si nanoparticles are embedded in the honeycomb-like carbon framework in the fiber core, which is further wrapped by the interlocked cobweb-like carbon shell network. As lithium-ion battery anode, the well-defined [email protected] demonstrates a reversible capacity of 903 mAh gâ1 and a capacity retention of 89% after 100 cycles with a current density of 0.2 A gâ1. With the current density gradually increasing to 2.0 A gâ1, the electrode shows a specific capacity of 743 mAh gâ1, exhibiting superior rate capability compared to the Si/C fibers with a core-shell but unconnected structure. The excellent electrochemical properties are attributed to the hierarchical core-shell structure and cross-linked network for the Si/C composite fibers. The carbon framework in the core region accommodates the volume expansion of Si by the honeycomb-like pores. And the interconnected carbon shell can not only prevent electrolyte from permeating into the core section, but also improve the electronic conductivity by the connections in the fiber network.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 98, March 2016, Pages 582-591
Journal: Carbon - Volume 98, March 2016, Pages 582-591
نویسندگان
Junxiong Wu, Xianying Qin, Cui Miao, Yan-Bing He, Gemeng Liang, Dong Zhou, Ming Liu, Cuiping Han, Baohua Li, Feiyu Kang,