▎ 摘　　要

Fe3O4/graphene composites have been prepared through a facile solvothermal process. Influence of PVP on the structure, morphologies, and electrochemical properties of composites were detected by means of X-ray diffraction, FT-IR spectra, Raman spectroscopy, scanning electron microscope, transmission electron microscopy, and electrochemical measurements. The results showed that Fe3O4 microspheres were dispersed and anchored on graphene nanosheets. The Fe3O4 microspheres are composed of nanoparticles and exhibit the interstitial cluster structure. The average size of Fe3O4 microspheres with introduction of PVP is smaller than that without PVP. As anodes materials for lithium-ion batteries, Fe3O4/G-PVP electrode exhibits better rate performance and higher capacities compared with Fe3O4/G electrode. Fe3O4/G-PVP can deliver an initial discharge capacity of 850.4 mA h g(-1) and a high capacity of 400 mA h g(-1) after 300 cycles at a current density of 1300 mAg(-1). (C) The Electrochemical Society of Japan, All rights reserved.