Electrochemical Performance of (Si+SiO)/G Composites Anode Material

Aiming at large volume expansion (~300%) and poor cycling stability of silicon-based anode material, (Si+SiO)/G composites anode material was prepared by two-step high-energy ball milling method. Its structure, morphology and electrochemical performance were analyzed by X ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge/discharge testing and electrochemical impedance spectrometry. The results show that the prepared (Si+SiO)/G composites has regular morphology and uniform distribution. The electrochemical performance of (Si+SiO)/G composites is significantly improved compared with the original material, the charge capacity is 2 701.9 mAh·g^-1 at current density of 200 mA·g^-1, and the initial coulombic efficiency for first cycle is 83.4%, the reversible capacity is 1 063.8 mAh·g^-1 after 60 cycles.