期刊
NANO ENERGY
卷 68, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2019.104307
关键词
Lithium-sulfur batteries; Graphdiyne; Mass transfer; Carbon material; Polyanion
类别
资金
- National Nature Science Foundation of China [21790050, 21790051]
- National Key Research and Development Project of China [2016YFA0200104]
- Key Program of the Chinese Academy of Sciences [QYZDY-SSW-SLH015]
- National Science Foundation for Young Scientists of China [51802311]
- Foundation of the Youth Innovation Promotion Association of Chinese Academy of Sciences [2019032]
The advantages of an enhanced inner mass transfer in the primary nanostructure have been ignored for a long time in the lithium-sulfur (Li-S) batteries. This paper demonstrates the construction of Nafion@graphdiyne core-shell nanostructure, which first embeds a polyanion (Nafion) seamlessly in an all-carbon nanostructure of graphdiyne. The graphdiyne acts as the conductive and mechanical backbone to store sulfur and offers active epicenters (sp-hybridized carbon) for the cathodic reaction. The embedded Nafion greatly enhances the inner mass transfer behavior in the primary nanostructure, thus improves the phase transformation reaction, leading to the efficient suppression of the polysulfides shuttle. The Li-S battery incorporating such core-shell nanostructure performs high retention in its capacity even after 800 cycles at high current densities (0.5C and 1C). A high volume capacity of 1832 A h L-1, which is 53% of the theoretical value of sulfur is obtained succesfully. This core-shell nanostructure appears to produce new phenomena, properties, and functions. It can be applicable in, for example, catalysis, fuel cells, and supercapacitors, as well as batteries.
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