Harvesting Interconductivity and Intraconductivity of Graphene Nanoribbons for a Directly Deposited, High-Rate Silicon-Based Anode for Li-Ion Batteries
Harvesting Interconductivity and Intraconductivity of Graphene Nanoribbons for a Directly Deposited, High-Rate Silicon-Based Anode for Li-Ion Batteries
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DOI：
10.1021/acsaem.7b00228
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发表时间：
2018-03
影响因子：
9.5
通讯作者：
Ghazal Shoorideh;B. Ko;Adam Berry;M. J. Divvela;Yong Seok Kim;Zhong Li;B. Patel;S. Chakrapani;Y. Joo
中科院分区：
文献类型：
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作者：
Ghazal Shoorideh;B. Ko;Adam Berry;M. J. Divvela;Yong Seok Kim;Zhong Li;B. Patel;S. Chakrapani;Y. Joo
用于高倍率应用（如电动汽车）的电池需要高效地调动电荷（电子和离子）。为此，电极中导电碳的选择可以使电极的性能产生显著差异。在这项工作中，石墨烯纳米带（GNRs）作为硅基阳极的导电途径进行了探索。采用水基静电纺丝将聚乙烯醇(PVA) -硅-石墨烯纳米带复合纤维直接沉积在铜集流器上。所使用的gnr的大小决定了它们的放置位置：要么在每个光纤内（小gnr），要么作为多个光纤之间的桥梁（大gnr）。恒流充放电循环表明，与具有相应前驱体碳纳米管（CNTs）的纤维相比，具有gnr的纤维具有更高的容量和总体保留率。为了进一步区分gnr作为导电剂的有效性，对含有两种gnr及其母碳纳米管的样品进行了速率能力测试。F……
Batteries for high-rate applications such as electric vehicles need to be efficient at mobilizing charges (both electrons and ions). To this end, choice of the conductive carbon in the electrode can make a significant difference in the performance of the electrode. In this work, graphene nanoribbons (GNRs) are explored as conductive pathways for a silicon-based anode. Water-based electrospinning is employed to directly deposit poly(vinyl alcohol) (PVA)–silicon–graphene nanoribbon composite fibers on a copper current collector. The size of the employed GNRs dictates their placement: either inside each fiber (small GNRs) or as a bridge between multiple fibers (large GNRs). Galvanostatic charge/discharge cycles reveal that fibers with GNRs have higher capacity and overall retention compared to those with corresponding precursor carbon nanotubes (CNTs). To further distinguish the effectiveness of GNRs as the conductive agent, samples with two GNRs and their parent CNTs were subject to rate-capability tests. F...