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Date of Publication:2017-01-01

Journal:无机化学学报

Volume:33

Issue:12

Page Number:2262-2270

ISSN No.:1001-4861

Abstract:Silicon nanoparticles (Si NPs) have been prepared by DC arc-discharge plasma,which were pretreated by 4-aminobenzoic acid (ABA) and further in situ coated by the conductive polyaniline (PANi) on its surface,thus the core/shell type polyaniline-silicon nanoparticles (PANi-Si NPs) composite was fabricated.Analysis results by means of Fourier transform infrared spectroscopy (FTIR),differential scanning calorimetry (DSC),transmission electron microscopy (TEM) and X-ray diffraction (XRD) indicate that ABA and Si NPs are connected by chemical bonds,and the aniline (ANi) group has been grafted onto the surface of Si NPs.The content of PANi in the composite particles is about 62％.As an anode material for Li-ion batteries,the existence of PANi coating layer can greatly improve the cycle stability of Si NPs-containing electrode.About 92.5％ of the initial capacity can be maintained after 100 cycles at current density of 100 mA·g-1.The incorporation of PANi can make the active Si NPs surrounded by the conformal conductive coating,not only providing good electrical connection to Si NPs,but also accommodating huge volume change of silicon during the charge-discharge process to greatly enhance its cycling performance.

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