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-pr...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.展开更多
以硝酸铁和氯化锰为原料,采用水热法制备铁酸锰(MnFe_2O_4)颗粒,研究不同实验条件对产物纯度的影响。采用X射线衍射仪(XRD)、扫描电镜(SEM)等手段对材料的微观结构和形貌进行表征。采用电化学分析手段分析材料的电化学性能。结果表明,...以硝酸铁和氯化锰为原料,采用水热法制备铁酸锰(MnFe_2O_4)颗粒,研究不同实验条件对产物纯度的影响。采用X射线衍射仪(XRD)、扫描电镜(SEM)等手段对材料的微观结构和形貌进行表征。采用电化学分析手段分析材料的电化学性能。结果表明,碱性条件下,当铁锰的摩尔比为2∶1,反应温度160℃,反应时间3 h时,可以制备出具有尖晶石结构的铁酸锰颗粒。该材料作为锂离子电池负极材料具有优异的电化学性能:首次充放电比容量为1 309 m A·h/g,100次循环后放电比容量稳定在160 m A·h·/g。展开更多
基金Project (20110490594) supported by China Postdoctoral Science Foundation
文摘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.
文摘以硝酸铁和氯化锰为原料,采用水热法制备铁酸锰(MnFe_2O_4)颗粒,研究不同实验条件对产物纯度的影响。采用X射线衍射仪(XRD)、扫描电镜(SEM)等手段对材料的微观结构和形貌进行表征。采用电化学分析手段分析材料的电化学性能。结果表明,碱性条件下,当铁锰的摩尔比为2∶1,反应温度160℃,反应时间3 h时,可以制备出具有尖晶石结构的铁酸锰颗粒。该材料作为锂离子电池负极材料具有优异的电化学性能:首次充放电比容量为1 309 m A·h/g,100次循环后放电比容量稳定在160 m A·h·/g。
