Facile Fabrication of 3D SiO2@Graphene Aerogel Composites as Anode Material for Lithium Ion Batteries

Abstract

A three-dimensional amorphous SiO2@graphene aerogel (SiO2@GA) composites as anode material for lithium ion batteries was successfully synthesized via a one-pot process. The materials were characterized by nitrogen adsorption-desorption, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectra and Fourier-Transform infrared spectra. The results demonstrate that the SiO2@GA composites are in meso-macoporous structures and present large surface area (SBET=396.9m2g−1) and high pore volume (Vp=0.67cm3g−1). Meanwhile, the incorporation of SiO2 does not make obvious effect at the reduction degree of GO to assemble GA. The results of their electrochemical performance reveal that in contrast with bare SiO2, the SiO2@GA anode exhibit higher reversible capacity (∼300mAhg−1 at a current density of 500mAg−1), more stable cycling performance, and excellent rate-capability. The significantly improves electrochemical performance may be ascribed to the 3D aerogel structure and the doping of GA.