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

Author(s): YU Xiao-Lei, YANG Jun, FENG Xue-Jiao, GAO Peng-Fei, WANG Jiu-Lin, NULI Yan-Na

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 28;
Issue: 9;
Start page: 937;
Date: 2013;
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Keywords: silicon anode; lithium-ion batteries; magnesiothermic reduction; SBA-15

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¡æ 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.
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