Abstract:

Si/C composite anode material was successfully fabricated by electrospinning with PAN as macromolecule polymer collocation and carbon source. Decomposition process of the precursor was investigated by thermal gravimetric analysis (TG), and the structure and morphology of the asprepared samples were characterized by Xray diffraction (XRD), Raman spectrum and scanning electron microscope (SEM). The result shows that Si/C composite anode material is nanofiber structure. The fiber diameter is about 350 nm with distributing interlaced mesh. PAN decomposition products are mostly amorphous carbon at a high temperature. The electrochemical test results demonstrate that battery discharge capacities are respectively 735.6,712.1,685.4,492.3 and 367.9 mA·h/g at 0.1,0.2,0.5,1.0 and 2.0 C, and this material has very excellent rate performance.

Key words: lithiumion battery, electrostatic spinning, anode material, nanofiber