Graphene-based three-dimensional hierarchical sandwich-type architecture for high-performance Li/S batteries

Renjie Chen, Teng Zhao, Jun Lu, Feng Wu*, Li Li, Junzheng Chen, Guoqiang Tan, Yusheng Ye, Khalil Amine

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

399 引用 (Scopus)

摘要

A multiwalled carbon nanotube/sulfur (MWCNT@S) composite with core-shell structure was successfully embedded into the interlay galleries of graphene sheets (GS) through a facile two-step assembly process. Scanning and transmission electron microscopy images reveal a 3D hierarchical sandwich-type architecture of the composite GS-MWCNT@S. The thickness of the S layer on the MWCNTs is ∼20 nm. Raman spectroscopy, X-ray diffraction, thermogravimetric analysis, and energy-dispersive X-ray analysis confirm that the sulfur in the composite is highly crystalline with a mass loading up to 70% of the composite. This composite is evaluated as a cathode material for Li/S batteries. The GS-MWCNT@S composite exhibits a high initial capacity of 1396 mAh/g at a current density of 0.2C (1C = 1672 mA/g), corresponding to 83% usage of the sulfur active material. Much improved cycling stability and rate capability are achieved for the GS-MWCNT@S composite cathode compared with the composite lacking GS or MWCNT. The superior electrochemical performance of the GS-MWCNT@S composite is mainly attributed to the synergistic effects of GS and MWCNTs, which provide a 3D conductive network for electron transfer, open channels for ion diffusion, strong confinement of soluble polysulfides, and effective buffer for volume expansion of the S cathode during discharge.

源语言英语
页(从-至)4642-4649
页数8
期刊Nano Letters
13
10
DOI
出版状态已出版 - 9 10月 2013

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Chen, R., Zhao, T., Lu, J., Wu, F., Li, L., Chen, J., Tan, G., Ye, Y., & Amine, K. (2013). Graphene-based three-dimensional hierarchical sandwich-type architecture for high-performance Li/S batteries. Nano Letters, 13(10), 4642-4649. https://doi.org/10.1021/nl4016683