Amorphous silicon-carbon nanospheres synthesized by chemical vapor deposition using cheap methyltrichlorosilane as improved anode materials for Li-ion batteries.
Amorphous silicon-carbon nanospheres synthesized by chemical vapor deposition using cheap methyltrichlorosilane as improved anode materials for Li-ion batteries.
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DOI：
10.1039/c3nr00635b
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发表时间：
2013-06
期刊：
影响因子：
6.7
通讯作者：
Zailei Zhang;Meiju Zhang;Yanhong Wang;Qiangqiang Tan;Xiaopeng Lv;Z. Zhong;Hong Li;F. Su
中科院分区：
文献类型：
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作者：
Zailei Zhang;Meiju Zhang;Yanhong Wang;Qiangqiang Tan;Xiaopeng Lv;Z. Zhong;Hong Li;F. Su
本文报道了非晶硅碳纳米球作为锂离子电池负极材料的制备和表征。这些纳米球是在900℃的化学气相沉积下合成的，以甲基三氯硅烷（CH3SiCl3）作为Si和C前驱体，这是有机硅烷工业中廉价的副产物。采用x射线衍射、透射电镜、扫描电镜、氮吸附、热重分析、拉曼光谱和x射线光电子能谱对样品进行了表征。结果表明，由非晶C（约60 wt%）和Si（约40 wt%）组成的Si-C纳米球直径为400-600 nm，比表面积为43.8 m(2) g（-1）。在50、200、500、1000和50 mA g（-1）循环50次后，其充电容量分别为483.6、331.7、298.6、180.6和344.2 mA h g(-1)，均高于商用石墨阳极。Si- c非晶结构可以吸收Li插入和提取反应中大量Si的体积变化，阻止电极的开裂或破碎，从而提高了可逆容量和循环稳定性。本研究为低成本制备锂离子电池负极材料开辟了一条新途径。
We report the preparation and characterization of amorphous silicon-carbon (Si-C) nanospheres as anode materials in Li-ion batteries. These nanospheres were synthesized by a chemical vapor deposition at 900 °C using methyltrichlorosilane (CH3SiCl3) as both the Si and C precursor, which is a cheap byproduct in the organosilane industry. The samples were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, nitrogen adsorption, thermal gravimetric analysis, Raman spectroscopy, and X-ray photoelectron spectroscopy. It was found that the synthesized Si-C nanospheres composed of amorphous C (about 60 wt%) and Si (about 40 wt%) had a diameter of 400-600 nm and a surface area of 43.8 m(2) g(-1). Their charge capacities were 483.6, 331.7, 298.6, 180.6, and 344.2 mA h g(-1) at 50, 200, 500, 1000, and 50 mA g(-1) after 50 cycles, higher than that of the commercial graphite anode. The Si-C amorphous structure could absorb a large volume change of Si during Li insertion and extraction reactions and hinder the cracking or crumbling of the electrode, thus resulting in the improved reversible capacity and cycling stability. The work opens a new way to fabricate low cost Si-C anode materials for Li-ion batteries.