A reduced graphene oxide loading iron-based fluoride (abbreviated as Fe2F5·H2O/rGO) as a cathode material for sodium ion batteries (SIBs) has been successfully prepared by an ionic-liquid-assisted route. The morphology, structure, physicochemical properties and electrochemical performance are characterized by X-ray powder diffraction (XRD), Rietveld refinement of XRD pattern, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical tests. The XRD result shows that the crystal structure of the as-prepared sample can be indexed to the cubic Fd-3m space group and the lattice parameter is as follow: a = 1.04029 nm and V = 1.12581 nm3. Moreover, the SEM and TEM images reveal that the as-prepared rGO has a rough wavy structure and flexural paper-like morphology, and numerous Fe2F5·H2O particles are firmly adhered on the surface of the rGO to form an uniform Fe2F5·H2O/rGO composite. Electrochemical tests show that the initial discharge capacity of Fe2F5·H2O/rGO sample is 248.7 mAh g−1and the corresponding charging capacity up to 229.7 mAh g−1at a rate of 20 mA g−1. Especially, the Fe2F5·H2O/rGO possesses good cycling stability, and it can deliver a discharge capacity of 164.2 mAh g−1at the 100th cycle. Besides, the rate capability tests show that a stable high capacity of 186.0 mAh g−1can be resumed when the current rate returns to 20 mA g−1after 20 cycles.
Jiang, M., Wang, X., Wei, S., Shen, Y., Hu, H. (2016). An ionic-liquid-assisted approach to synthesize a reduced graphene oxide loading iron-based fluoride as a cathode material for sodium-ion batteries. JOURNAL OF ALLOYS AND COMPOUNDS, 670, 362-368 [10.1016/j.jallcom.2016.01.248].
An ionic-liquid-assisted approach to synthesize a reduced graphene oxide loading iron-based fluoride as a cathode material for sodium-ion batteries
Wei S.;
2016
Abstract
A reduced graphene oxide loading iron-based fluoride (abbreviated as Fe2F5·H2O/rGO) as a cathode material for sodium ion batteries (SIBs) has been successfully prepared by an ionic-liquid-assisted route. The morphology, structure, physicochemical properties and electrochemical performance are characterized by X-ray powder diffraction (XRD), Rietveld refinement of XRD pattern, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical tests. The XRD result shows that the crystal structure of the as-prepared sample can be indexed to the cubic Fd-3m space group and the lattice parameter is as follow: a = 1.04029 nm and V = 1.12581 nm3. Moreover, the SEM and TEM images reveal that the as-prepared rGO has a rough wavy structure and flexural paper-like morphology, and numerous Fe2F5·H2O particles are firmly adhered on the surface of the rGO to form an uniform Fe2F5·H2O/rGO composite. Electrochemical tests show that the initial discharge capacity of Fe2F5·H2O/rGO sample is 248.7 mAh g−1and the corresponding charging capacity up to 229.7 mAh g−1at a rate of 20 mA g−1. Especially, the Fe2F5·H2O/rGO possesses good cycling stability, and it can deliver a discharge capacity of 164.2 mAh g−1at the 100th cycle. Besides, the rate capability tests show that a stable high capacity of 186.0 mAh g−1can be resumed when the current rate returns to 20 mA g−1after 20 cycles.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
