Abstract: Core/shell nanofibers were successfully prepared by co-axial electrospinning, including carbon as a core and tin @ carbon as a shell. According to the classical electrospinning theory to calculate the diameter of nanofibers, the different diameter ratios of core/shell namofibers were obtained using different core/shell electrosppinning speed ratios, and then applied them in lithium-ion battery tests as anode materials. The morphology of core/shell nanofibers was characterized by transmission electron microscopy. X-ray diffractometer were measured to assess the structure of nanofibers. Especially, the electrochemical properties were detected. The study revealed that the different diameters of core/shell nanofibers were got by adjusting core/shell electrospping speed ratio; the crystal structures, tin and carbon were contained after carbonized at 800°C; when the core/shell electrospinning speed ratio at 1:1, carbon/tin@carbon nanofiers owned the best cycle stability, the capacity retention is 69% after 50 cycles.

Key words: tin/carbon encapsulated carbon nanofiber, co-axial electrospinning, morphology, electrochemical property