Coaxial electrospun Si/C-C core-shell composite nanofibers as binder-free anodes for lithium-ion batteries


Li Y., Xu G., Yao Y., Xue L., Yanilmaz M. , Lee H., ...Daha Fazla

SOLID STATE IONICS, cilt.258, ss.67-73, 2014 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 258
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1016/j.ssi.2014.02.003
  • Dergi Adı: SOLID STATE IONICS
  • Sayfa Sayıları: ss.67-73

Özet

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.