Facile Synthesis of Si@SiC Composite as an Anode Material for Lithium-Ion Batteries

By Ngo, Duc Tung; Le, Hang T. T.; Pham, Xuan-Manh; Park, Choong-Nyeon; Park, Chan-Jin
Published in ACS Applied Materials & Interfaces 2017

Abstract

Here, we propose a simple method for direct synthesis of a Si@SiC composite derived from a SiO2@C precursor via a Mg thermal reduction method as an anode material for Li-ion batteries. Owing to the extremely high exothermic reaction between SiO2 and Mg, along with the presence of carbon, SiC can be spontaneously produced with the formation of Si. The synthesized Si@SiC was composed of well-mixed SiC and Si nanocrystallites. The SiC content of the Si@SiC was adjusted by tuning the carbon content of the precursor. Among the resultant Si@SiC materials, the Si@SiC-0.5 sample, which was produced from a precursor containing 4.37 wt % of carbon, exhibits excellent electrochemical characteristics, such as a high first discharge capacity of 1642 mAh g

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