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首页> 外文期刊>ACS applied materials & interfaces >Facile Synthesis of Si@SiC Composite as an Anode Material for Lithium-Ion Batteries
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Facile Synthesis of Si@SiC Composite as an Anode Material for Lithium-Ion Batteries

机译：Si @ SiC复合材料的构成为锂离子电池的阳极材料

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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(-1) and 53.9% capacity retention following 200 cycles at a rate of 0.1C. Even at a high rate of 10C, a high reversible capacity of 454 mAh g-1 was obtained. Surprisingly, at a fixed discharge rate of C/20, the Si@SiC-0.5 electrode delivered a high capacity of 989 mAh g(-1) at a charge rate of 20C. In addition, a full cell fabricated by coupling a lithiated Si@SiC-0.5 anode and a LiCoO2 cathode exhibits excellent cyclability over 50 cycles. This outstanding electrochemical performance of Si@SiC-0.5 is attributed to the SiC phase, which acts as a buffer layer that stabilizes the nanostructure of the Si active phase and enhances the electrical conductivity of the electrode.
机译：这里，我们提出了一种简单的方法，可以通过Mg热还原方法直接合成来自SiO 2 @ C前体的Si〜SiC复合物作为锂离子电池的阳极材料。由于SiO 2和Mg之间的极高放热反应，随着碳的存在，可以通过形成Si自发地产生SiC。合成的Si @ SiC由良好混合的SiC和Si纳米晶体组成。通过调节前体的碳含量来调整Si @ SiC的SiC含量。在得到的Si @ Si @ Si @ SiC材料中，由含有4.37wt％的碳的前体制备的Si@sic-0.5样品表现出优异的电化学特性，例如高的第一放电容量为1642mAhg（-1）和53.9％的容量保留在200周期下的速率为0.1℃。即使在10℃的高速率下，也获得了454mAhg-1的高可逆容量。令人惊讶的是，在C / 20的固定放电速率下，Si@sic-0.5电极以20℃的电荷率为高容量的989mAhg（-1）。另外，通过耦合锂化的Si@siC-0.5阳极和LiCoO2阴极制造的全部细胞具有优异的可循环性超过50个循环。 Si@sic-0.5的这种出色的电化学性能归因于SiC相，其用作稳定Si主动相的纳米结构并增强电极的导电性的缓冲层。

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