期刊
JOURNAL OF ENERGY CHEMISTRY
卷 36, 期 -, 页码 64-73出版社
ELSEVIER
DOI: 10.1016/j.jechem.2019.04.023
关键词
MoS2; Graphene; Yolk shell; 2D heterostructure; Lithium sulfur batteries
资金
- National Key R@D Program of China [2016YBF0100100, 2016YFA0200200]
- National Natural Science Foundation of China [51572259, 51872283]
- LiaoNing Revitalization Talents Program [XLYC1807153]
- Natural Science Foundation of Liaoning Province [20180510038]
- DICP [DICP ZZBS201708, DICP ZZBS201802]
- DICPQIBEBT [DICPQIBEBT UN201702]
- Dalian National Laboratory For Clean Energy (DNL), CAS
- DNL Cooperation Fund, CAS [DNL180310, DNL180308]
- Fundamental Research Funds for the Central Universities of China [N180503012, N172410002-16]
Lithium sulfur (Li-S) batteries hold great promising for high-energy-density batteries, but appear rapid capacity fading due to the lack of overall and elaborated design of both sulfur host and interlayer. Herein, we developed a novel two-dimensional (2D) hierarchical yolk-shell heterostructure, constructed by a graphene yolk, 2D void and outer shell of vertically aligned carbon-mediated MoS2 nanosheets (G@void@MoS2/C), as advanced host-interlayer integrated electrode for Li-S batteries. Notably, the 2D void, with a typical thickness of similar to 80nm, provided suitable space for loading and confining nano sulfur, and vertically aligned ultrathin MoS2 nanosheets guaranteed enriched catalytically active sites to effectively promote the transition of soluble polysulfides. The conductive graphene yolk and carbon mediated shell sufficiently accelerated electron transport. Therefore, the integrated electrode of G@void@MoS2/C not only exceptionally confined the sulfur/polysulfides in 2D yolk-shell heterostructures, but also achieved catalytic transition of the residual polysulfides dissolved in electrolyte to solid Li2S2/Li2S, both of which synergistically achieved an extremely low capacity fading rate of 0.05% per cycle over 1000 times at 2 C, outperforming most reported Mo based cathodes and interlayers for Li-S batteries. 2D hierarchical yolkshell heterostructures developed here may shed new insight on elaborated design of integrated electrodes for Li-S batteries. (C) 2019 The Author(s). Published by Elsevier B.V. and Science Press on behalf of Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences.
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