Preparation of uniform flower-like CuO and flower-like CuO/graphene composite and their application in lithium ion batteries

来源期刊:中国有色金属学报(英文版)2012年第10期

论文作者:陈晗 冯钒 胡忠良 刘富生 龚文强 向楷雄

文章页码:2523 - 2528

关键词:锂离子电池;负极材料;氧化铜微球;石墨烯

Key words:lithium ion batteries; anode materials; CuO microsphere; graphene

摘    要:采用水热法合成了花状CuO 和花状CuO/石墨烯复合材料。采用XRD、SEM、TEM、BET、TG对材料的结构、形貌及性能进行表征和分析。花状CuO由CuO的纳米片组成,平均直径为4.2 μm,比表面积为12.6 m2/g。与花状CuO相比,花状CuO/石墨烯复合材料具有更高的充放电容量和更优良的循环稳定性。在0.1C、1C倍率下,其放电容量分别为603 mA·h/g、382 mA·h/g;在1C倍率下,经过50次循环,其容量保持率高达95.5%。

Abstract: Flower-like CuO and flower-like CuO/graphene composite were prepared successfully by hydrothermal method. They were characterized by X-ray diffraction, scanning electron microscopy, nitrogen adsorption, temperature-programmed reduction, and thermogravimetric analysis. It is found that the flower-like CuO microspheres, which are composed of CuO nanosheets, possess an average diameter of 4.2 μm and a Brunauer–Emmett–Teller surface area of 12.6 m2/g. Compared with the flower-like CuO, the obtained flower-like CuO/graphene composite shows an enhanced electrochemical performance with a higher capacity of 603 mA·h/g at 0.1 C rate and 382 mA·h/g at 1 C rate, and exhibits a better cycle stability with a high capacity retention of 95.5 % after 50 cycles even though at 1 C rate.

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