当前位置: X-MOL 学术J. Ind. Eng. Chem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
3D Hierarchical Structure of MoS2@G-CNT Combined with Post-Film Annealing for Enhanced Lithium-ion Storage
Journal of Industrial and Engineering Chemistry ( IF 6.1 ) Pub Date : 2019-01-01 , DOI: 10.1016/j.jiec.2018.09.015
Quoc Hai Nguyen , Jin Seok Choi , Young-Chul Lee , Il Tae Kim , Jaehyun Hur

Abstract We present a three-dimensional hierarchical structure of a ternary nanocomposite consisting of MoS2, graphite, and carbon nanotubes, as a new anode material for lithium-ion batteries. The 3D structure (3D MoS2@G-CNT), prepared by a simple and scalable high-energy ball milling process, contains 2D heterogeneous clusters between MoS2 and graphite, which are effectively interconnected by 1D carbon nanotubes. During the formation of 2D heterogeneous clusters, the surface area of MoS2 is significantly increased due to exfoliation driven by the solid lubrication effect from mechanical milling. The morphology and structural properties of 3D MoS2@G-CNT are analyzed by various techniques including XRD, Raman, SEM, TEM, and BET. At the optimal ratio of ingredients, 3D MoS2@G-CNT shows excellent electrochemical performance in terms of specific capacity, long-term cycle life, and rate capability. Specifically, at the best experimental conditions, 3D MoS2@G-CNT delivers ∼1600 mAh g−1 at 0.2 A g−1 after 100 cycles and ∼1200 mAh g−1 at 0.5 A g−1 after 450 cycles. To achieve these, we also introduce a post-film annealing step which induced rearrangement of the binder, thus improving the adhesion between the electrode material and current collector. Enhanced charge transport and mechanical integrity after this treatment are confirmed by FTIR, ex-situ SEM, and photographs.

中文翻译:

MoS2@G-CNT 的 3D 分层结构结合膜后退火增强锂离子存储

摘要 我们提出了一种由二硫化钼、石墨和碳纳米管组成的三元纳米复合材料的三维分层结构,作为锂离子电池的新型负极材料。通过简单且可扩展的高能球磨工艺制备的 3D 结构 (3D MoS2@G-CNT) 在 MoS2 和石墨之间包含 2D 异质簇,它们通过 1D 碳纳米管有效互连。在 2D 异质团簇的形成过程中,由于机械研磨的固体润滑效应驱动的剥落,MoS2 的表面积显着增加。通过 XRD、拉曼、SEM、TEM 和 BET 等多种技术分析了 3D MoS2@G-CNT 的形貌和结构特性。在最佳的成分比例下,3D MoS2@G-CNT 在比容量、长期循环寿命和倍率性能方面表现出优异的电化学性能。具体而言,在最佳实验条件下,3D MoS2@G-CNT 在 100 次循环后以 0.2 A g-1 提供 ~1600 mAh g-1,在 450 次循环后以 0.5 A g-1 提供 ~1200 mAh g-1。为了实现这些,我们还引入了膜后退火步骤,该步骤会引起粘合剂的重新排列,从而提高电极材料和集电器之间的粘附力。FTIR、非原位 SEM 和照片证实了这种处理后电荷传输和机械完整性的增强。我们还引入了膜后退火步骤,该步骤会引起粘合剂的重排,从而提高电极材料和集电器之间的附着力。FTIR、非原位 SEM 和照片证实了这种处理后电荷传输和机械完整性的增强。我们还引入了膜后退火步骤,该步骤会引起粘合剂的重排,从而提高电极材料和集电器之间的附着力。FTIR、非原位 SEM 和照片证实了这种处理后电荷传输和机械完整性的增强。
更新日期:2019-01-01
down
wechat
bug