KCS

We report the interfacial study of a Graphene/Carbon nanofiber/Silicon Composite material as a potentially high performance anode for rechargeable lithium ion batteries. Carbon nanofibers (CNFs) were grown via chemical vapor deposition method with an iron-copper catalysts. Acetylene as a carbon source was flowed into the quartz reactor of a tubular furnace heated to 700℃, and maintained for 30 min to synthesize CNFs. GO aqueous dispersion was added into the CNFs/Silicon solution, and the mixture was sonicated for 6h to obtain a GO/CNFs/Silicon aqueous dispersion. Electrode was fabricated by flow-directed vacuum filtration of GO/CNFs/Silicon aqueous dispersion through a filter membrane (90 mm in diameter and 0.22 μm in pore diameter) followed by air drying and peeling off from the filter. The morphologies, compositions and crystal quality of the prepared Graphene/CNFs/Silicon composites were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscope (TEM), X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The electrochemical characteristics of Graphene/CNFs/Silicon composites as an anode of Li secondary batteries were investigated using three-electrode cell. The galvanostatic charge–discharge cycling and cyclic voltammetry measurements were carried out at room temperature by using a battery tester.