Graphene Loaded with Cluster Structural CoFe2O4 Particles and Its Li-Storage Performanc

doi:10.15541/jim20160624

Abstract

Abstract:

Oxidized graphite was used as carbon precursor, the preparations of graphene and cluster structural CoFe₂O₄ particles which homogeneously loaded on the grasphene were realized on the same time by one-step hydrothermal process combined with the bonding of oxygen-containing functional groups and metal ions. The microstructure observation shows that CoFe₂O₄ particles are composed of many primary particles. The unique structure of the composites helps graphene to develop its advantages of high conductivity and large specific surface area. Compared with pure CoFe₂O₄, the composites have excellent cycle stability and high rate performance. High-rate characteristics arise from high conductivity of graphene which enhances the overall conductivity and the diffusion of lithium in the composites. At the same time, the unique cluster structure and the confine of graphene inhibit the volume change of active nanoparticles in the charging and discharging process, and ensure the stability of active materials.

Key words: graphene, cluster structure, electrochemical performance, sandwich structrue

CLC Number:

TQ174

LIU Shuang-Yu, XU Li, CHEN Xin, HAN Yu, LIU Hai-Zhen, SHENG Peng, WANG Bo, ZHAO Guang-Yao. Graphene Loaded with Cluster Structural CoFe₂O₄ Particles and Its Li-Storage Performanc[J]. Journal of Inorganic Materials, 2017, 32(9): 904-908.

Figures/Tables 5

Fig. 1 Schematic illustration of the growth process of hollow structural CoFe2O4/GNs hybrid

Fig. 2 SEM and TEM images of CoFe2O4/GNs composites (a) Low and (b) high magnification SEM images; (c) low and (d) high magnification TEM images

Fig. 3 XRD pattern of CoFe2O4/GNsc omposite

Fig. 4 Raman and XPS C1s spectra of GO, GNs and CoFe2O4/GNs composite (a) Raman and (b) XPS C1s spectra of GO, GNs and CoFe2O4/GNs

Fig. 5 Electrochemical performances of CoFe2O4/GNs composites (a) First three cycle of CoFe2O4/GNs composites; (b) Discharge/charge curves of CoFe2O4/GNs at different current density; (c) Rate performance of CoFe2O4/GNs compared with bare CoFe2O4; (d) Cycle stability of CoFe2O4/GNs at 400 and 800 mA/g

References 18

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Graphene Loaded with Cluster Structural CoFe₂O₄ Particles and Its Li-Storage Performanc

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