锂离子电池用氧化亚铜/石墨烯负极材料的制备(英文)

Synthesis of Cu_2O/reduced graphene oxide composites as anode materials for lithium ion batteries

在不添加表面活性剂的水溶液体系中,采用水合肼作为还原剂制备得到具有八面体形貌的氧化亚铜/石墨烯复合材料。透射电镜分析表明:氧化亚铜颗粒与石墨烯在复合物中呈多层次分布,而且氧化亚铜一次颗粒很好地嵌入在石墨烯层间。相比于纯氧化亚铜,氧化亚铜/石墨烯复合材料作为锂离子电池负极材料的电化学性能得到了显著的改善。在100 mA/g的电流密度下循环50次后,氧化亚铜/石墨烯复合物的可逆比容量高达348.4 mA·h/g,同时,在不同倍率下(50,100,200,400,800 mA/g)循环60次后,其可恢复容量仍达305.8 mA·h/g。

A facile way was used to synthesize Cu2O/reduced graphene oxide （rGO） composites with octahedron-like morphology in aqueous solution without any surfactant. TEM images of the obtained Cu2O/rGOs reveal that the Cu2O particles and rGO distribute hierarchically and the primary Cu2O particles are encapsulated well in the graphene nanosheets. The electrochemical performance of Cu2O/rGOs is enhanced compared with bare Cu2O when they are employed as anode materials for lithium ion batteries. The Cu2O/rGO composites maintain a reversible capacity of 348.4 mA？h/g after 50 cycles at a current density of 100 mA/g. In addition, the composites retain 305.8 mA？h/g after 60 cycles at various current densities of 50, 100, 200, 400 and 800 mA/g.