▎ 摘　　要

Graphene wrinkles were ubiquitous during the preparation and application. The wrinkles can affect the interfacial interactions between graphene and metal oxides in composites. Here, a high density corn-like Co3O4/graphene hybrid material (Co3O4/GNSs) was prepared by direct pyrolysis of Co(NO3)(2)center dot 6H(2)O on graphene nanosheets (GNSs) through self-assembly induced by graphene wrinkles. The morphology and structure of the as-prepared Co3O4/GNS composites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Co3O4/GNSs, used as an anode material, exhibited a reversible capacity of 911 mA h g(-1) for the first charge process and 1060 mA h g(-1) after 50 cycles at 50 mA g(-1), respectively. At 500 and 1000 mA g(-1), the reversible capacities could reach 763 and 561 mA h g(-1), which were 84% and 62% of that at 50 mA g(-1). The high capacity and excellent rate performance should be attributed to the synergistic effect between Co3O4 and GNSs. The presence of GNSs can act as a substrate for the growth of corn-like Co3O4 and a highly conductive matrix for good contact between GNSs and Co3O4 nanoparticles. In particular, the presence of wrinkles can provide a buffer for the volume expansion of Co3O4. In turn, the presence of Co3O4 can also reduce the restacking of GNSs.