Graphite microspheres decorated with Si particles derived from waste solid of organosilane industry as high capacity anodes for Li-ion batteries
Graphite microspheres decorated with Si particles derived from waste solid of organosilane industry as high capacity anodes for Li-ion batteries
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有机硅烷工业废固体中硅颗粒修饰的石墨微球作为锂离子电池的高容量阳极
DOI：
10.1016/j.jpowsour.2012.11.083
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发表时间：
2013-04-15
影响因子：
9.2
通讯作者：
Su, Fabing
中科院分区：
文献类型：
--
作者：
Yu, Jing;Zhan, Hanhui;Su, Fabing
我们报道了用硅颗粒装饰商用石墨微球（GMs）作为锂离子电池负极材料。硅颗粒是从有机硅工业的固体硅废料中获得的，经过酸洗去除杂质并进一步研磨。以粒径为5 ~ 40 μ m的gm为主要活性物质，粒径为1 ~ 10 μ m的Si颗粒为添加剂，以溶解于水的蔗糖为粘结剂，混合后碳化，得到由蔗糖生成的石墨、Si和无定形碳组成的Si/C复合材料。结果表明，在800℃加热5 h得到的含60.5 wt% GMs、22.1% Si和17.4 wt%无定形碳的复合材料具有最佳的电化学性能，在50 mA g（-1）电流密度下比容量为522.6 mA h g(-1)，在500 mA g（-1）电流密度下比容量为306.9 mA h g(-1)，远远高于GMs。在500 mA g（-1）下，经过20次循环后，其容量保持率达到93.9%。该研究表明，利用工业硅废料增强锂离子电池石墨负极材料的可能性。(C) 2012 Elsevier B.V.版权所有
We report the decoration of commercial graphite microspheres (GMs) with Si particles as anode materials for Li-ion batteries. The Si particles are obtained from solid Si waste of organosilane industry that is acid-washed to remove the impurities and further ground. The GMs with a size of 5-40 mu m as main active material, Si particles with a size of 1-10 mu m as an additive, and sucrose dissolved in water as a binder are mixed and followed by carbonization to obtain Si/C composites containing graphite, Si, and amorphous carbon generated from sucrose. It is found that the composite containing 60.5 wt% of GMs, 22.1 wt% of Si, and 17.4 wt% of amorphous carbon obtained at 800 degrees C for 5 h shows the best electrochemical performance with a specific capacity of 522.6 mA h g(-1) at the current density of 50 mA g(-1) and 306.9 mA h g(-1) at 500 mA g(-1), much higher than those of GMs. Its capacity retention at 500 mA g(-1) attains 93.9% after 20 cycles. The work demonstrates the possibility for utilization of the industrial Si waste to enhance graphite anode materials in Li-ion batteries. (C) 2012 Elsevier B.V. All rights reserved.