Novel silicon/carbon nano-branches synthesized by reacting silicon. with methyl chloride: A high performing anode material in lithium ion battery
Novel silicon/carbon nano-branches synthesized by reacting silicon. with methyl chloride: A high performing anode material in lithium ion battery
复制标题
通过硅反应合成的新型硅/碳纳米分支。
DOI：
10.1016/j.jpowsour.2016.09.110
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发表时间：
2016-11-15
影响因子：
9.2
通讯作者：
Su, Fabing
中科院分区：
文献类型：
--
作者：
Ren, Wenfeng;Wang, Yanhong;Su, Fabing
为克服锂离子电池中Si/C复合负极粉化和容量衰减快的技术障碍，降低其生产成本，我们开发了一种简单的制备Si/C纳米支化（Si/C NB）的方法。采用X射线衍射、扫描电子显微镜、透射电子显微镜、热重分析和拉曼光谱对样品进行了表征。发现Si/C纳米带的直径和长度分别接近70 nm和6 μ m。当用作锂离子电池负极材料时，它们表现出优异的电化学性能，在50 mA·g（-1）电流密度下的平均比容量为849 mA·h·g（-1）。其电化学性能的显著提高主要归功于其独特的支化纳米结构和表面包覆的碳层，有效地提高了材料的电导率，缓冲了材料的体积变化。本工作为制备新型支化纳米结构Si/C负极材料提供了一条简单、低成本的途径。(C)© 2016 Elsevier B. V.版权所有。
To overcome the existing technical barriers of pulverization and fast capacity fading of Si/C composite anodes in lithium ion batteries and to low their production cost, we have developed a facile method for preparing Si/C nano-branches (Si/C NBs) by reacting commercial Si microparticles directly with CH3Cl gas over Cu-based catalyst particles followed by a simple post treatment. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, and Raman spectroscopy. It was found that the diameter and the length of Si/C NBs were similar to 70 nm and similar to 6 mu m, respectively. When used as the anode materials for lithium ion batteries, they displayed excellent electrochemical properties with an average specific capacity of 849 mA h g(-1) at a current density of 50 mA g(-1). The much improved electrochemical performance is attributed to the unique branched nanostructure and the coated carbon layer on the surface, which can effectively increase the electrical conductivity and buffer the volume change. This work provides a simple and low-cost route to prepare Si/C anode materials with novel branched nanostructure for lithium ion batteries. (C) 2016 Elsevier B.V. All rights reserved.