▎ 摘　　要

The cost-effective, scalable, and reproducible production of a graphene/Si (Gra/Si) composite still holds the key to their commercialization as anodes for lithium-ion batteries (LIBs). Herein, we report the onestep in situ preparation of liquid-exfoliated Gra/Si composites towards practical anodes for commercial LIBs. The Gra/Si composites are prepared by exposing the mixture of pristine graphite flakes and Si nanoparticles to ultrasonication in water/surfactant solutions. The composite's major ingredients are found to be highly exfoliated graphene and crystal Si nanoparticles. As the anode in LIBs, the composite with similar to 47.3 wt% Si shows improved electrochemical performance, with superiorly rate performance and a high reversible capacity of 700 mA h g(-1) after 100 cycles. The improved performance is ascribed to the graphene-derived 3D porous structure, which makes the Si nanoparticles well dispersed and buffers the volume change during the charge discharge cycles. With respect to the simple and scalable liquid exfoliated Gra/Si composite, the achieved performance here is fascinating for commercial LIBs.