▎ 摘　　要

A stable Si composite anode with a high storage lithium capacity for lithium-ion batteries (LIBs) is important for energy storage. In the present paper, a new scalable method is adopted in combination with large size multilayer reduced graphene and Si electrode materials. Compared with the pure Si particles, the composite has greatly improved performance as Li-ion battery anodes in terms of capacity, cycling stability, and coulombic efficiency. The gravimetric capacity versus the mass of the whole electrode was retained 780 mA h g(-1) after 100 cycles for a sample with 50% Si content. Noteworthy, the initial coulombic efficiency is 83% which is significantly higher than prior studies; meanwhile the electrode also shows a good cycle life during 100 cycles, which is several orders of magnitude higher than that of pure Si loaded on copper foil directly. We believe that the preparation method of large size graphene and Si composite may provide a low cost, high efficiency, and scalable mass-produced method to prepare Si based material for electrochemical energy storage. Such a simple and scalable method may also be applied to other anode systems to boost their energy and power densities for LIBs.