水热法合成硫化铜微米花及其电化学性能

Synthesis of copper sulfide microflowers by hydrothermal method andits electrochemical properties

以氯化铜(CuCl_(2)·2 H_(2)O)为铜源,硫脲(CH_(4)N_(2)S)为硫源,聚乙二醇(PEG)为表面活性剂,采用水热法于150℃反应10 h成功制备出由纳米片组成的硫化铜(CuS)微米花,利用X射线衍射仪、扫描电子显微镜、透射电子显微镜对样品的组成和形貌进行表征,利用倍率充放电、循环伏安法(CV)以及电化学交流阻抗测试对样品的电化学性能进行研究,讨论了Cu_(7.2)S_(4)的存在对材料电化学性能的影响。分析结果表明:通过水热法制备得到的CuS微米花的首次放电比容量为765.2 mAh/g,首次充电比容量为318.9 mAh/g,库仑效率为41.68%;CuS/Cu_(7.2)S_(4)材料的首次放电比容量为817 mAh/g,首次充电比容量为477.2 mAh/g,库仑效率为58.41%,相较而言,CuS/Cu_(7.2)S_(4)材料的电化学性能比纯相CuS略有提升。

By using copper chloride(CuCl_(2)·2 H_(2)O)as the copper source,thiourea(CH_(4)N_(2)S,Tu)as the sulfur source,and polyethylene glycol(PEG)as the surfactant,the copper sulfide(CuS)microflowers composed of the nanosheets were successfully prepared by hydrothermal method at 150℃for 10 h.X-ray diffractometer,scanning electron microscope,and transmission electron microscope were used to characterize the composition and morphology of the sample,and the electrochemical performance of the sample was measured by rate charge-discharge,cyclic voltammetry(CV),and electrochemical AC impedance test.The influence of the presence of Cu_(7.2)S_(4) on the electrochemical performance of the material was discussed.The analysis results show that the first discharge and charge specific capacity of CuS microflowers prepared by hydrothermal method are 765.2 and 318.9 mAh/g,and the coulomb efficiency is 41.68%.The first discharge and charge specific capacity of CuS/Cu_(7.2)S_(4 )material are 817 and 477.2 mAh/g,and the coulomb efficiency is 58.41%.In comparison,the electrochemical performance of CuS/Cu_(7.2)S_(4) material is slightly better than pure phase CuS.