▎ 摘　　要

A new nanocomposite of Si nanoparticles homogenously encapsulated in a graphene composite was prepared by a facile layer-by-layer (LBL) assembled modification method, followed by an electrostatic attraction directed self-assembly approach and thermally reduced process. The wrinkled graphene sheets were assembled into a three-dimensional network and covered the surface of the highly dispersed Si nanoparticles well. The as-prepared Si-graphene composite exhibited good electrochemical performance as an anode material in lithium-ion batteries, showing a stable reversible capacity of 1150 mA h g(-1) with a high capacity retention rate of 92.0% over 100 cycles and high rate capability (840 mA h g(-1) at 3000 mA g(-1)).