期刊
SOLID STATE IONICS
卷 258, 期 -, 页码 67-73出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2014.02.003
关键词
Coaxial electrospinning; Carbon nanofiber; Si nanoparticle; Lithium-ion battery; Anode
资金
- U.S. Department of Energy [DE-EE0001177]
- Advanced Transportation Energy Center
- ERC Program of the National Science Foundation [EEC-08212121]
Si/C-C core-shell nanofiber structure was designed by dual nozzle coaxial electrospinning and subsequent carbonization. This core-shell nanofiber structure has Si/C composite as the core and carbon as the shell. Used as an anode in lithium-ion batteries, the carbon shell can help buffer the large volume expansion/contraction of the Si/C core during charge/discharge and restrain the capacity fading caused by the mechanical failure of the active material. Results showed that after 50 cycles, the discharge capacity of Si/C-C core-shell composite nanofibers was 63% higher than that of Si/C composite nanofibers and the capacity retention increased from 48.6 to 72.4%. It is, therefore, demonstrated that Si/C-C core-shell composite nanofibers are promising anode material with large reversible capacity and good cycling stability. (c) 2014 Elsevier B.V. All rights reserved.
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