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

doi:10.3724/SP.J.1077.2013.12672

Abstract

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

CLC Number:

TM911
O613

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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