Enhancement of the Cyclability of a Si/Graphite@Graphene composite as anode for Lithium-ion batteries
Enhancement of the Cyclability of a Si/Graphite@Graphene composite as anode for Lithium-ion batteries
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DOI：
10.1016/j.electacta.2013.10.195
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发表时间：
2014-01-10
影响因子：
6.6
通讯作者：
Gan, Lei
中科院分区：
文献类型：
--
作者：
Su, Mingru;Wang, Zhixing;Gan, Lei
通过改进的喷雾干燥法和热处理方法制备了Si/Graphite@Graphene复合材料。通过热重分析（TG-DTA）确定前驱体的热沉积，通过X射线衍射（XRD）揭示复合物的结构。同时，通过傅里叶变换红外光谱（FI-IR）和拉曼光谱研究证实了石墨烯的存在。扫描电子显微镜（SEM）和透射电子显微镜（TEM）图像说明了所制备的材料的形貌。Si/Graphite@Graphene复合材料显示出增强的电化学性能。在50 mA g（-1）下，Si/Graphite@Graphene样品表现出820.7 mAh g（-1）的高初始充电容量，具有77.98%的高初始库仑效率，该复合材料在500 g（-1）下仍然可以提供766.2 mAh g（-1）的高初始充电容量，并且表现出上级的循环和倍率性能。此外，它具有低阻抗，这表明它可以用作锂离子电池的有前途的负极材料。(C)2013爱思唯尔有限公司保留所有权利。
Si/Graphite@Graphene composite has been prepared by an improved spray-drying method followed by heating treatment. While the thermal deposition of the precursor is determined by thermogravimetric analysis (TG-DTA), the structure of the composite is revealed by X-ray diffraction (XRD). Meanwhile, the presence of graphene is demonstrated by fourier transform infrared spectra (FI-IR) and Raman spectra studies. And scanning electron microscopy (SEM) and transmission electron microscope (TEM) images illustrate the morphology of the as-prepared material. The Si/Graphite@Graphene composite shows an enhanced electrochemical performance. At 50 mA g(-1), the Si/Graphite@Graphene sample exhibits a high initial charge capacity of 820.7 mAh g(-1), with a high initial columbic efficiency of 77.98%, the composite can still deliver high initial charge capacity of 766.2 mAh g(-1) at 500 g(-1), and shows superior cyclic and rate performance. Moreover, it has low impedance, which indicates that it could be used as a promising anode material for Li-ion batteries. (C) 2013 Elsevier Ltd. All rights reserved.