Ferric Oxide-reduced Graphene Oxide Composite Material: Synthesis Based on Covalent Binding and Its Lithium-storage Property

doi:10.15541/jim20170441

Abstract

Abstract:

Monodispersed ferroferric oxide (Fe₃O₄) microspheres were prepared by a solvo-thermal method at first. They were coated with a thin layer of silica, and modified with amino groups. These updated microspheres were mixed with graphene oxide (GO) followed by a chemical reduction to yield Fe₃O₄-W-RGO. The sample was characterized with scanning electron microscopy (SEM) and transition electron microscopy (TEM). Fe₃O₄ microspheres (~440 nm in diameter) are proved to be surface-coated by a SiO₂ layer homogeneously to afford Fe₃O₄@SiO₂core-shell microspheres, tightly bound to reduced graphene oxide (RGO) nanosheets. From X-ray diffraction (XRD) patterns, Fe₃O₄ microspheres display good crystallinity and high purity. Results of electrochemical measurements indicate that Fe₃O₄-W-RGO sample can deliver an initial capacity of 1246 mAh/g at 0.1C rate over 0.01 V-3.00 V (vs. Li⁺/Li), and retain 830 mAh/g after 100 cycles. Even at 2C rate, it can still deliver a capacity of 484 mAh/g. All results suggest that Fe₃O₄-W-RGO composite material possesses good rate capability and cycling performance when used as anode material for lithium-ion batteries.

Key words: ferroferric oxide, graphene oxide, covalent binding interaction, lithium-ion batteries

CLC Number:

TQ174

QIN Shi-Lin, LI Ji-Cheng, LI Zhao-Hui, HU Zhong-Liang, DING Yan-Huai, LEI Gang-Tie, XIAO Qi-Zhen. Ferric Oxide-reduced Graphene Oxide Composite Material: Synthesis Based on Covalent Binding and Its Lithium-storage Property[J]. Journal of Inorganic Materials, 2018, 33(7): 741-748.

Figures/Tables 6

Fig. 1 XRD patterns and the Rietveld refinement of Fe3O4 sample (a), XRD patterns of Fe3O4, Fe3O4/RGO and Fe3O4-W-RGO samples (b), Fe2p (c) and C1s (d) XPS spectra of Fe3O4-W-RGO sample

Fig. 2 SEM images of Fe3O4 (a), Fe3O4/RGO (b) and Fe3O4-W-RGO (c) samples, TEM image of Fe3O4 (d) and HRTEM images (e, f) of the sample Fe3O4-W-RGO

Fig. 3 N2 isothermal adsorption-desorption curves of the samples (a) and pore-size distribution curves (b)

Fig. 4 Galvanostatic charge/discharge profiles of the samples at various cycles and their cyclic voltammograms for the first three cycles, cycling performance and rate capability

Fig. 5 Schematic illustration of the morphology change of samples before and after the repeated charging-discharging process

Fig. 6 Electrochemical impedance spectra of the samples before and after cycling, equivalent circuit model and the stimulated data

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