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Oriented wrinkle textures of free-standing graphene nanosheets: application as a high-performance lithium-ion battery anode
Carbon Letters ( IF 5.5 ) Pub Date : 2020-06-23 , DOI: 10.1007/s42823-020-00163-9
Hee-Sung Jeong , Jongsoon Kim , Kyoung-Il Jo , Jinho Kee , Jae-Hak Choi , Jaseung Koo

Morphology control of a graphene nanosheet (GNS) is important for graphene-based battery electrodes to exhibit the increased practical surface area and the enhanced ion diffusion into the nanosheets. Nevertheless, it is very difficult to minutely control the shape of graphene nanosheets based on the conventional GNS suspension methods. In this work, we fabricated wrinkle textures of free-standing GNS for large area using Langmuir–Schaefer technique. The wrinkles are oriented vertically to the direction of the monolayer compression. The textured structure of GNS was obtained by cross-deposition of each layer with controlling the orientation of the wrinkle direction. These wrinkles can cause Li-ion to diffuse into the voids created by them and raise the specific surface area between the GNSs. Consequently, as a prospective anode for Li-ion battery, the wrinkled GNS multilayer, exhibits the high specific capacity of ~ 740 mAh g−1 at 100 mA g−1 and the great power capability with ~ 404 mAh g−1 being delivered even at 2 A g−1. Furthermore, outstanding cycle performance of the wrinkled GNS multilayer is achieved over 200 cycles at 300 mA g−1 with high Coulombic efficiency of ~ 96%.



中文翻译:

独立式石墨烯纳米片的定向皱纹纹理:作为高性能锂离子电池阳极的应用

石墨烯纳米片(GNS)的形态控制对于石墨烯基电池电极表现出增加的实际表面积和增强的离子向纳米片中的扩散性非常重要。然而,基于常规的GNS悬浮方法,很难精细地控制石墨烯纳米片的形状。在这项工作中,我们使用Langmuir–Schaefer技术制作了大面积独立式GNS的皱纹纹理。皱纹垂直于单层压缩方向。通过在控制皱纹方向的方向上对每一层进行交叉沉积,可以获得GNS的纹理结构。这些皱纹会导致锂离子扩散到由它们产生的空隙中,并增加GNS之间的比表面积。因此,作为锂离子电池的预期阳极,-1在100mA克-1,并用〜404毫安克的巨大功率能力-1被即使在2甲克递送-1。此外,在300 mA g -1的200次循环中,起皱的GNS多层膜具有出色的循环性能,库仑效率高达96%。

更新日期:2020-06-24
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