Silicon-graphite composite anode materials for lithium ion batteries

A silicon-graphite composite was studied as a means of preparation of silicon-based anode material for lithium ion batteries. The composite was obtained by milling the mixture of nano-silicon powder and fine graphite particle with different mass ratios of silicon to graphite. The crystal structure and the electrochemical performance were characterized by XRD, SEM and electrochemical performance testing. The mass ratio of silicon to graphite, 1:9, was found through the charge-discharge measurement. Studied results demonstrate that this obtained material shows better cycling performance than pure nano-silicon and higher reversible capacity than graphite.