Abstract: This contribution presents the preparation and electrochemical performance of a series of reduced graphene oxide (RGO)/silicon network structured composites, which differ in RGO/Si ratio and are expected to serve as anode materials for Li-ion batteries. The preparation of the composites involved a combination of several methods such as ultrasonic exfoliation, electrostatic self-assembly, magnetic stirring and high temperature reduction, within an alkaline circumstance and from the graphene oxide (GO) which had been obtained by a modified Hummers method using natural flake graphite powders. The microstructure and relevant characteristics of the prepared RGO/Si composites was characterized and analyzed by means of XRD, SEM, TEM, energy dispersive X-ray microanalysis (EDX), and specific surface area analysis. And the electrochemical performance test was conducted under room temperature and various current densities. The experimental results showed that the prepared RGO/Si composites have a network structure, in which silicon microparticles distribute uniformly in the RGO networks. Moreover, the RGO/Si composites with RGO-to-Si ratios of 2∶1 and 1∶1 displayed relatively satisfactory electrochemical performances compared with the samples with RGO-to-Si ratios of 1∶4, 1∶2 and 4∶1. The RGO/Si (2∶1) composite has a specific capacity of 1 231 mAh/g and a coulomb efficiency of 90.9% for the first cycle, as well as a reversible capacity retaining above 452 mAh/g and a Coulombic efficiency of 99.2% within 20 cycles. The RGO/Si (1∶1) composite was observed to have the most compact RGO lamellar coated onto Si microparticles and the most stable network structure, so that it exhibited high capacity retention abilities at high current density.
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2019, Vol. 33 
