Cluster Structural CoFe₂O₄ Particles Loaded onto Graphene and Its Li-Storage Performance

Oxidized graphite was used as carbon precursor, the preparations of graphene and cluster structural CoFe 2 O 4 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 CoFe 2 O 4 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 CoFe 2 O 4 , 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.