High-performance SiO/C/G Composite Anode for Lithium Ion Batteries

Silicon monoxide/carbon/graphite(SiO/C/G) composite with high capacity and excellent cycling performance has been successfully synthesized via high-energy mechanical milling and followed pyrolysis of silicon monoxide/sucrose/natural graphite mixture. The phase composition and morphology of the samples were characterized by X-ray diffractometer(XRD) and scanning electron microscope(SEM). Nano-sized(50 nm) SiO particles were bonded by amorphous carbon and homogenously dispersed on graphite flakes in the as-prepared composite. After 100cycles, the composite electrode kept a reversible capacity of 1108.9 mAh/g with the capacity retention of 103.8%.Uniform distribution of SiO particles in the amorphous carbon matrix, better buffering effect of carbon matrix and enhanced electrical conductivity are responsible for the superior electrochemical performance.