镁热还原法制备有序介孔Si/C锂离子电池负极材料及其电化学性能  

Magnesiothermic Reduction Preparation and Electrochemical Properties of a Highly Ordered Mesoporous Si/C Anode Material for Lithium-Ion Batteries

作　　者：唐艳平[1] 元莎 郭玉忠[1] 黄瑞安[2] 王剑华[1] 杨斌[2] 戴永年[2] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]昆明理工大学真空冶金国家工程实验室,昆明650093

出　　处：《物理化学学报》2016年第9期2280-2286,共7页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(51464025)资助项目~~

摘　　要：以SBA-15为前驱体,在660°C下通过镁热还原反应得到介孔硅材料,并对其进行碳包覆处理,成功地制备了有序介孔Si/C(OMP-Si/C)复合材料。该OMP-Si/C材料保留了SBA-15模板的有序蜂窝孔道,并且形成具有高堆积密度的莲藕链束结构。文中还提出了一个SBA-15镁热还原液态环境反应模型,探讨了660°C下硅的高度有序介孔与莲藕链束结构的形成机理。利用X射线衍射(XRD)仪、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、氮气吸脱附法及拉曼光谱对样品物相和微观形貌进行了表征。这种高度有序介孔Si/C复合材料具有优异的电化学性能,展现出其在第二代锂电池负极材料领域中的潜在应用价值。A highly ordered mesoporous Si/C composite was prepared by magnesiothermic reduction method, using SBA-15 as the precursor at 660 ℃ with subsequent carbon coating. This Si/C composite preserved the ordered honeycomb pore channels of SBA-15 and exhibited a lotus root-like structure with high packing density. A liquid ambient reaction model is proposed to explain the reaction between SBA-15 and magnesium powder at 660 ℃ as well as the mechanism by which the highly ordered mesoporous structure is generated. The phase composition and morphology of this material were analyzed by X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, nitrogen adsorption-desorption and Raman spectroscopy. The excellent electrochemical performance of the as-prepared material suggests potential applications as an anode material in second-generation Li-ion batteries.

关 键 词：锂离子电池 介孔硅 负极材料 纳米复合材料 镁热还原法 

分 类 号：TB332[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]