Influence of graphene oxide on electrochemical performance of Si anode material for lithium-ion batteries

摘要

We have developed a Si/graphene oxide electrode synthesized via ultrasonication-stirring method under alkaline condition.Scanning electron microscopy (SEM),transmission electron microscope (TEM),EDS dot-mapping and high-resolution transmission electron microscopy (HRTEM) results show that Si particles are evenly dispersed on the graphene oxide sheets.The electrochemical performance was investigated by galvanostatic charge/discharge tests at room temperature.The results revealed that Si/graphene oxide electrode exhibited a high reversible capacity of 2825 mAh/g with a coulombic efficiency of 94.6％ at 100 mA/g after 15 cycles and a capacity retention of 70.8％ after 105 cycles at 4000 mA/g.These performance parameters show a great potential in the high-performance batteries application for portable electronics,electric vehicles and renewable energy storage.