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首页> 外文期刊>International Journal of Electrochemical Science >High-cycling-stability of Nanosized Sandwich Structure Silicon/Graphene Composite as Anode for Lithium-Ion Batteries
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High-cycling-stability of Nanosized Sandwich Structure Silicon/Graphene Composite as Anode for Lithium-Ion Batteries

机译：纳米夹心结构硅/石墨烯复合材料作为锂离子电池阳极的高循环稳定性

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摘要

The nanosized sandwich structure silicon/graphene composite anode material was designed to enhance anode performance for lithium-ion batteries (LIBs) by a facile method of mechanical ball milling. The structure and morphology of the materials were investigated by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM). The electrochemical properties of this composites electrode were studied by a series of electrochemical tests. As anode of LIBs, the composite material exhibited a high initial reversible capacity of 2189.7 mAh·g-1 at a current density of 1000 mA·g-1, and showed an enhanced cyclic performance with a reversible capacity of 1212.9 mAh·g-1 after 100 cycles. The performance improvement be attributed that as a good matrix, the graphene sheets mitigated the volume expansion/shrinkage of silicon during the lithiation/delithiation processes and increased electrical conductivity of anode materials.
机译：纳米夹层结构硅/石墨烯复合负极材料经过设计，可通过机械球磨的简便方法来增强锂离子电池（LIB）的负极性能。通过X射线衍射（XRD）和场发射扫描电子显微镜（FESEM）研究了材料的结构和形貌。通过一系列电化学测试研究了该复合电极的电化学性能。作为LIBs的阳极，复合材料在电流密度为1000 mA·g-1时表现出高的初始可逆容量2189.7 mAh·g-1，并显示出增强的循环性能，可逆容量为1212.9 mAh·g-1 100个周期后。性能的提高归因于作为良好的基质，石墨烯片减轻了锂化/去锂化过程中硅的体积膨胀/收缩，并减轻了阳极材料的电导率。

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