A Facile Synthesis of SiO2@C@graphene Composites as Anode Material For Lithium Ion Batteries

SiO2@C@graphene composites were prepared by two-step hydrothermal method and thermal treatment, and then characterized by XRD, FT-IR, Raman, FE-SEM, and TEM. The results demonstrated that SiO2@C@graphene composites exhibit higher reversible capacity, improved cycling stability, and favorable rate capability compared with bare SiO2 nanoparticles and SiO2@C composites. At 50 mA/g, 200 mA/g and 1000 mA/g, the SiO2@C@graphene composites delivered a discharge capacity of 225 mAh/g, 152 mAh/g, 76 mAh/g, respectively, and after 200 cycles at 50 mA/g, the discharge capacity remained above 250 mAh/g.