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首页> 外文期刊>RSC Advances >Self-assembly of silicon/carbon hybrids and natural graphite as anode materials for lithium-ion batteries
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Self-assembly of silicon/carbon hybrids and natural graphite as anode materials for lithium-ion batteries

机译：自组装硅/碳杂化物和天然石墨作为锂离子电池的负极材料

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摘要

Silicon/carbonatural graphite (Si-C-NG) composites have been successfully prepared by the granulation of natural graphite (NG) and silicon/poly(acrylonitrile-co-divinylbenzene) [Si/poly(AN-co-DVB)] hybrid microspheres via spray drying and subsequent pyrolysis. The poly(AN-co-DVB) microspheres containing silicon nano-flakes are synthesized by microsuspension polymerization using benzoyl peroxide (BPO) as initiator and polyvinyl alcohol (PVA) as dispersant in aqueous phase. The morphology and microstructure of Si-C-NG composites are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Raman spectroscopy. It is found that the Si nanoparticles are uniformly enwrapped by pyrolytic carbon derived from poly(AN-co-DVB) to form Si-C core/shell structures, which are subsequently decorated on the surface of NG, resulting in a spherical Si-C-NG structure. When used as anode materials for lithium-ion batteries, the Si-C-NG composites exhibit a high specific capacity of 471.5 mA h g(-1), a high initial coulombic efficiency of 78.4%, and a good cycling stability with capacity retention of 87.9% after 100 cycles at a current density of 100 mA g(-1).
机译：硅/碳/天然石墨（Si-C-NG）复合材料已通过天然石墨（NG）和硅/聚（丙烯腈-共二乙烯基苯）[Si / poly（AN-co-DVB）]的造粒成功制备。混合微球通过喷雾干燥和随后的热解。通过过氧化苯甲酰（BPO）作为引发剂和聚乙烯醇（PVA）作为分散剂在水相中进行微悬浮聚合，合成了含硅纳米薄片的聚（AN-co-DVB）微球。 Si-C-NG复合材料的形貌和微观结构通过扫描电子显微镜（SEM），透射电子显微镜（TEM），能量色散光谱（EDS），X射线衍射（XRD）和拉曼光谱表征。发现Si纳米颗粒被聚（AN-co-DVB）衍生的热解碳均匀包裹，形成Si-C核/壳结构，随后将其装饰在NG表面，形成球形Si-C -NG结构。当用作锂离子电池的负极材料时，Si-C-NG复合材料显示出471.5 mA hg（-1）的高比容量，78.4％的高初始库伦效率和良好的循环稳定性以及容量保持率。在100 mA g（-1）的电流密度下进行100次循环后达到87.9％。

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