Article ID Journal Published Year Pages File Type
1295641 Solid State Ionics 2014 7 Pages PDF
Abstract

•Si/C-C core-shell nanofibers were designed by dual nozzle coaxial electrospinning.•Carbon shell buffers volume change and restrains capacity fading of the Si/C core.•Si/C-C core-shell nanofibers show high discharge capacity after prolonged cycling.

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.

Related Topics
Physical Sciences and Engineering Chemistry Electrochemistry
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