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Facile Synthesis of Si@SiC Composite as an Anode Material for Lithium-Ion Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1021/acsami.7b10658 Duc Tung Ngo 1 , Hang T. T. Le 1, 2 , Xuan-Manh Pham 1 , Choong-Nyeon Park 1 , Chan-Jin Park 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1021/acsami.7b10658 Duc Tung Ngo 1 , Hang T. T. Le 1, 2 , Xuan-Manh Pham 1 , Choong-Nyeon Park 1 , Chan-Jin Park 1
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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.
中文翻译：
锂离子电池负极材料Si @ SiC复合材料的合成
在此，我们提出了一种简单的方法，该方法可通过Mg热还原法直接合成由SiO 2 @C前驱体衍生的SiO 2 SiC复合材料作为锂离子电池的负极材料。由于SiO 2和Mg之间极高的放热反应以及碳的存在，因此可以自发生成SiC并生成Si。合成的Si @ SiC由充分混合的SiC和Si纳米微晶组成。通过调节前体的碳含量来调节Si @ SiC的SiC含量。在所得的Si @ SiC材料中，由含4.37 wt％的碳的前体制成的Si@SiC-0.5样品具有出色的电化学特性，例如1642 mAh g –1的高首次放电容量在200次循环后，以0.1C的速率保留53.9％的容量。即使在10C的高速率下，也可获得454 mAh g –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电极在20C的充电速率下可提供989 mAh g –1的高容量。此外，通过将锂化的Si@SiC-0.5阳极和LiCoO 2阴极耦合制成的全电池在50个循环中显示出出色的循环性。Si@SiC-0.5的出色电化学性能归因于SiC相，该相作为缓冲层，可稳定Si活性相的纳米结构并增强电极的导电性。
更新日期：2017-09-18
中文翻译：
锂离子电池负极材料Si @ SiC复合材料的合成
在此，我们提出了一种简单的方法，该方法可通过Mg热还原法直接合成由SiO 2 @C前驱体衍生的SiO 2 SiC复合材料作为锂离子电池的负极材料。由于SiO 2和Mg之间极高的放热反应以及碳的存在，因此可以自发生成SiC并生成Si。合成的Si @ SiC由充分混合的SiC和Si纳米微晶组成。通过调节前体的碳含量来调节Si @ SiC的SiC含量。在所得的Si @ SiC材料中，由含4.37 wt％的碳的前体制成的Si@SiC-0.5样品具有出色的电化学特性，例如1642 mAh g –1的高首次放电容量在200次循环后，以0.1C的速率保留53.9％的容量。即使在10C的高速率下，也可获得454 mAh g –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电极在20C的充电速率下可提供989 mAh g –1的高容量。此外，通过将锂化的Si@SiC-0.5阳极和LiCoO 2阴极耦合制成的全电池在50个循环中显示出出色的循环性。Si@SiC-0.5的出色电化学性能归因于SiC相，该相作为缓冲层，可稳定Si活性相的纳米结构并增强电极的导电性。
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