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Honeycomb‐Like Nitrogen‐Doped Carbon 3D Nanoweb@Li2S Cathode Material …

Year of publication
Title of paper
Honeycomb‐Like Nitrogen‐Doped Carbon 3D Nanoweb@Li2S Cathode Material for Use in Lithium Sulfur Batteries
Author
[김원배 교수] 이차전지-리튬황전지 양극소재
Publication in journal
ChemSusChem 12(4), p824-829, 2019
Publication date
20190221

[Abstract]

Current lithiumion batteries have a low theoretical capacity that is insufficient for use in emerging electric vehicles and energystorage systems. The development of lithiumsulfur batteries utilizing Li2S cathodes would be a promising option to overcome the capacity limitation. In this work, new threedimensional (3D) honeycomblike Ndoped carbon nanowebs (HCNs) have been synthesized through a facile aqueous solution route for use as a cathode material in lithiumsulfur batteries. The Li2S@HCNs cathode delivers a high discharge capacity of approximately 815mAhg1 after 65cycles at 0.1C, along with a superior rate capacity of approximately 568mAhg1 even at 2C. The outstanding electrochemical rate performance is ascribed to their unique 3D honeycomblike nanoweb structure, consisting of nanowires derived from polypyrrole. These properties greatly enhance the electrochemical reaction kinetics by providing efficient electron pathways and hollow channels for electrolyte transport. Nitrogen doping in the carbon nanowebs also considerably improves the chemisorption properties by tuning affinity between sulfur and oxygen functional groups on the carbon framework. The simple synthesis strategy and the resulting unique electrode structure could present a new avenue in nanostructure research for highperformance lithiumsulfur batteries.

 

DOI: 10.1002/cssc.201802698
Link: https://doi.org/10.1002/cssc.201802698