Flexible Free-Standing Graphene-Fe2O3 Hybrid Paper with Enhanced Electrochemical Performance for Rechargeable Lithium-Ion Batteries

The cyclic performance of flexible free-standing graphene-Fe2O3 hybrid sheet is considerably improved and was fabricated by a novel one-step hydrothermal process. The X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical workstation are performed to characterize the microstructure and electrochemical performance of the graphene-Fe2O3 hybrid sheet. At a current density of 200 mA center dot g(-1), the obtained product has a high initial discharge capacity of 1466 mAh center dot g(-1). The nanohybrids also exhibited a considerably high reversible capacity of 765 mAh center dot g(-1) and high Coulombic efficiency of 99.8% after 100 cycles, which benefited from the open 3D laminated nanostructure constructed by layered graphene paper and Fe2O3 nanoparticles. Therefore, the composite has excellent rate performance and stability and can be greatly extended as the anode material of lithium-ion batteries.

Automated summary

In this study, a flexible free-standing graphene-Fe2O3 hybrid sheet was successfully fabricated by a novel one-step hydrothermal process. The microstructure and electrochemical performance of the hybrid sheet were characterized using various techniques. The results show that the composite exhibits high initial discharge capacity and reversible capacity, as well as excellent cyclic performance and stability. Therefore, it has great potential as an anode material for lithium-ion batteries.