多孔硅/碳复合负极材料的制备及电化学性能

doi:10.3724/SP.J.1077.2013.12672

无机材料学报 ›› 2013, Vol. 28 ›› Issue (9): 937-942.DOI: 10.3724/SP.J.1077.2013.12672 CSTR: 32189.14.SP.J.1077.2013.12672

多孔硅/碳复合负极材料的制备及电化学性能

于晓磊, 杨军, 冯雪娇, 高鹏飞, 王久林, 努丽燕娜

(上海交通大学化学化工学院, 上海 200240)

收稿日期:2012-11-06 修回日期:2013-01-14 出版日期:2013-09-20 网络出版日期:2013-08-14
作者简介:于晓磊(1988-), 女, 硕士研究生. E-mail: zxlyu@sjtu.edu.cn

Preparation and Electrochemical Properties of Porous Silicon/Carbon Composite as Negative Electrode Materials

YU Xiao-Lei, YANG Jun, FENG Xue-Jiao, GAO Peng-Fei, WANG Jiu-Lin, NULI Yan-Na

(School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

Received:2012-11-06 Revised:2013-01-14 Published:2013-09-20 Online:2013-08-14
About author:YU Xiao-Lei. E-mail: zxlyu@sjtu.edu.cn

摘要/Abstract

摘要： 以介孔二氧化硅SBA-15为硅源, 采用镁热还原法和化学气相沉积(CVD)法合成了具有莲藕状结构的多孔硅/碳复合材料。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和氮气吸脱附法研究了原料配比, 混压方式以及反应温度对多孔硅物相组成和结构形貌的影响。多孔硅的最佳合成条件为: 镁粉过量20wt%, 原料经球磨混合均匀后直接在750℃下高温反应4 h。对多孔硅及多孔硅/碳材料进行了电化学性能测试, 在0.5 A/g电流密度下循环70次后仍保持1633.1 mAh/g的可逆容量, 并且在8 A/g下容量达到580.1 mAh/g, 表现出优异的循环稳定性以及倍率性能。

关键词: 硅负极, 锂离子电池, 镁热还原法, SBA-15

Abstract: Lotus root-like porous silicon / carbon composite was synthesized via magnesiothermic reduction and chemical vapor deposition (CVD) method, using mesoporous silica SBA-15 as silicon source. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and nitrogen adsorption-desorption measurements were used to study the effects of the raw material ratio, mixing-pressing method and reaction temperature on the phase composition and morphology of the lotus root-like porous silicon. The optimal synthesis condition of porous silicon is that the uniformly mixed precursors with the excess amount of 20wt% Mg powder after ball-milling are directly reacted at 750℃ for 4 h. The electrochemical tests reveal the porous silicon/carbon composite material maintains the reversible capacity of 1633.1 mAh/g at a current density of 0.5 A/g after 70 charge-discharge cycles, and attains 580.1 mAh/g even at 8 A/g.

Key words: silicon anode, lithium-ion batteries, magnesiothermic reduction, SBA-15

中图分类号:

TM911
O613

于晓磊, 杨军, 冯雪娇, 高鹏飞, 王久林, 努丽燕娜. 多孔硅/碳复合负极材料的制备及电化学性能[J]. 无机材料学报, 2013, 28(9): 937-942.

YU Xiao-Lei, YANG Jun, FENG Xue-Jiao, GAO Peng-Fei, WANG Jiu-Lin, NULI Yan-Na. Preparation and Electrochemical Properties of Porous Silicon/Carbon Composite as Negative Electrode Materials[J]. Journal of Inorganic Materials, 2013, 28(9): 937-942.

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多孔硅/碳复合负极材料的制备及电化学性能

Preparation and Electrochemical Properties of Porous Silicon/Carbon Composite as Negative Electrode Materials

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