Hybridization of Silicon/Carbon Composites with Natural Graphite for Improving Anodic Performances of Lithium-Ion Batteries

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Hybrid composites of silicon/pyrolytic carbon/carbon nanofiber (Si/PyC/CNF) with natural graphite were synthesized as a means of improved the anodic performance of Li-ion batteries. Samples made with hybridization levels of 10-30 wt% exhibited excellent cyclability with a discharge capacity of over 400 mAh/g. Si/PyC/CNF composites showed better hybridization effects on cyclability than composites containing Si/PyC. These effects were attributable to the more homogeneous dispersion of Si/PyC/CNF in the electrode material. The internal spaces created under such circumstances may prevent electrode destruction by relieving tensions induced by the expansion of Si particles in the electrode over the course of repeated charge and discharge processes.

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