Preparation of Silicon-based Anode Material by Ball Milling and Its Enhanced Lithium Storage Performance
Carbon nanotube/reduced graphene oxide/silicon anode material was prepared using the low-cost micron silicon as the raw material by using the high-energy ball milling method which is easy to scale up and high efficiency.Scanning electron microscopy,X-ray diffraction,Fourier transform Infrared spectros-copy and electrochemical testing techniques were used to investigate the crystal structure,morphology and electrochemical properties of materials.The results show that the ball milling process can not only reduce the size of silicon particles,but also promote the partial reduction and exfoliation of graphite oxide,so that it can be transformed into graphene.When the addition of carbon nanotubes is 1％and the addition of graphite oxide is 5％,the prepared negative electrode material has good electrochemical performance.After cyclig 200 times at a current density of 0.4 A/g,a discharge specific capacity of 1779.7 mAh/g is main-tained.This is mainly because carbon nanotubes and reduced graphene oxide can establish a highly efficient conductive network in the silicon anode,increasing the electron transfer rate,and at the same time,carbon nanotubes and reduced graphene oxide can reduce the charge transfer resistance of lithium ions and improve the diffusion of lithium ions during the lithium intercalation into silicon negative electrode.
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