中文摘要：

以膨胀石墨微粉为原料,采用氧化法制备了氧化石墨烯。并以此氧化石墨烯为前驱体,制备了具有＂三明治＂结构的氧化铜/石墨烯复合材料,采用原子力显微镜、X射线衍射仪、扫描和透射电子显微镜等分析方法对氧化石墨烯及氧化铜/石墨烯复合材料进行了表征。结果表明,氧化铜可有效地阻止石墨烯的团聚,同时石墨烯构成的三维导电网络加快了电子的迁移,并为氧化铜的体积膨胀收缩预留了足够的空间。与纯氧化铜和石墨烯相比,氧化铜/石墨烯复合材料作为锂离子负极材料的可逆容量和循环稳定性均有明显提升,首次可逆容量可以达到748.3 mAh.g-1,50次循环后保持率为81.3%。

英文摘要：

Graphene oxide was synthesized from expanded graphite powder by a simple one-step oxidation method. A CuO/gra- phene composite was then obtained using a hydrothermal method. The samples were characterized using AFM, XRD, SEM, TEM and electrochemical measurements. Results show that CuO acts as a spacer to prevent the agglomeration of graphene sheets. The graphene formed a 3D conducting network for fast electron transfer, as well as space to accommodate the volume expansion/contrac- tion of CuO during the discharge/charge process. The CuO/graphene composite exhibits enhanced electrochemical performance compared with pure CuO and graphene, such as improved initial coulombic efficiency （69.9%） and a reversible capacity of 748.3 mAh/g with 81.3 % retention after 50 cycles.