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三维石墨烯/二氧化锰复合材料的制备及其电化学性能

发表时间:2018-10-15  浏览量:79  下载量:35
全部作者: 张素玲,刘天畅,王倩,岳禄丰
作者单位: 廊坊师范学院化学与材料科学学院
摘 要: 以氧化石墨烯(graphene oxide,GO)、二氧化锰(MnO2)为原料,通过水热合成、冷冻干燥、高温活化制备出三维石墨烯/二氧化锰复合材料(3DG/MnO2),并通过扫描电子显微镜(scanning electron microscope,SEM)和X射线衍射(X-ray diffraction,XRD)对材料的结构和形貌进行表征。石墨烯和MnO2有效复合,减少了MnO2粒子间的团聚和石墨烯片层间的堆叠,所得复合材料呈多孔三维网络结构。以制备出的3DG/MnO2复合材料为电极材料,组装锂离子电池。采用恒流充放电、循环伏安(cyclic voltammetry,CV)和交流阻抗(electrochemical impedance spectroscopy,EIS)等对其电化学性能进行测试。结果显示,在0.1 A/g电流密度下放电比容量达1 142.4 mAh/g;在1.0 A/g电流密度下循环100次后,其容量保持率为85.3%. 3DG/MnO2复合材料弥补了单一材料的缺点,在一定程度上提高了电极材料的电化学性能,是一种较理想的储能材料。
关 键 词: 应用化学;石墨烯;复合材料;锂离子电池;电化学性能
Title: Preparation and electrochemical performance of 3D graphene/manganese bioxide composites
Author: ZHANG Suling, LIU Tianchang, WANG Qian, YUE Lufeng
Organization: College of Chemistry and Material Science, Langfang Normal University
Abstract: Three-dimensional (3D) graphene/manganese bioxide composites (3DG/MnO2) were prepared by hydrothermal reaction, followed by freeze-drying and high temperature activation process with graphene oxide (GO) and MnO2 as raw materials. The structure and morphology of the materials were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The effective combination of graphene and MnO2 reduces the agglomeration of MnO2 particles and the stack of graphene sheets presenting the 3D networks with porous structure. Lithium-ion battery is assembled using this 3DG/MnO2 composites as electrode material. The electrochemical performance is measured by galvanostatic charge/discharge, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Results show that the specific discharge capacity at current density of 0.1 A/g can reach 1 142.4 mAh/g, and after 100 cycles at current density of 1.0 A/g, the capacity retention rate is 85.3%. 3DG/MnO2 composites shows more excellent electrochemical performance than graphene or MnO2, becoming an ideal electrode material for energy storage devices.
Key words: applied chemistry; graphene; composites; lithium-ion battery; electrochemical performance
发表期数: 2018年10月第19期
引用格式: 张素玲,刘天畅,王倩,等. 三维石墨烯/二氧化锰复合材料的制备及其电化学性能[J]. 中国科技论文在线精品论文,2018,11(19):1985-1990.
 
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