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首页> 外文期刊>International Journal of Electrochemical Science >Silicon/Graphite/Polyaniline Nanocomposite with Improved Lithium-Storage Capacity and Cyclability as Anode Materials for Lithium-ion Batteries
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Silicon/Graphite/Polyaniline Nanocomposite with Improved Lithium-Storage Capacity and Cyclability as Anode Materials for Lithium-ion Batteries

机译：硅/石墨/聚苯胺纳米复合材料，具有改进的锂储存能力和可阻碍性作为锂离子电池的阳极材料

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摘要

A silicon/graphite/polyaniline (Si/G/PANI) nanocomposite is facilely prepared by the in-situ chemicalpolymerization of aniline monomer in the presence of nano-Si and graphite powders. This compositeare examined by scanning electronic microscopy, transmission electronic microscopy, Ramanspectroscopy, Fourier-transform infrared spectroscopy, and electrochemical measurements. It isobserved that the composite consists of nanosized silicon and graphite distributed uniformly in apolyaniline matrix. Galvanostatic charge-discharge profiles and cycling curves reveal that theSi/G/PANI composite exhibits good electrochemical performance: a high reversible specific capacity of 1392 mAh g for the first cycle and a stable capacity retention with 866 mAh g after 95 cycles. In contrast, pure Si nanoparticles only deliver the reversible capacity of 888 mAh g and 425 mAh gth for the first and the 95 cycles, respectively. The enhanced electrochemical performance is mainlyattributed to the reinforced electric contact of active materials, better dispersion of Si nanoparticles,and good structural stability of the Si/G/PANI composite electrode during the charge-dischargeprocess, which originate largely from the presence of PANI.
机译：通过在纳米 - Si和石墨粉末存在下，通过苯胺单体的原位化学聚合，硅/石墨/聚苯胺（Si / G / PANI）纳米复合材料易于制备。通过扫描电子显微镜，传输电子显微镜，ramanspectroscopy，傅里叶变换红外光谱和电化学测量来检查该组合。它不足，复合材料由纳米化硅和石墨组成均匀地分布在己酰基基质中。电镀电荷 - 放电曲线和循环曲线表明，ThESI / G / PANI复合材料表现出良好的电化学性能：第一个循环的高可逆特定容量为1392mAhg，95次循环后用866mAhg稳定保留。相比之下，纯Si纳米粒子仅为第一和95个循环分别提供888mAhg和425mAh Gth的可逆容量。增强的电化学性能主要是活性材料的增强电化接触，均匀分散的Si纳米颗粒，以及在电荷 - 放电过程中良好的Si / G / Pani复合电极的结构稳定性，其主要来自PANI的存在。

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