Synergy of nanoconfinement and surface oxygen in recrystallization of sulfur melt in carbon nanocapsules and the related Li-S cathode properties

Zeng, Qingcong (Ray), Wang, Da-Wei, Wu, Kuang-Hsu, Li, Yang, Condi De Godoi, Fernanda and Gentle, Ian R. (2014) Synergy of nanoconfinement and surface oxygen in recrystallization of sulfur melt in carbon nanocapsules and the related Li-S cathode properties. Journal of Materials Chemistry A, 2 18: 6439-6447. doi:10.1039/c4ta00314d


Author Zeng, Qingcong (Ray)
Wang, Da-Wei
Wu, Kuang-Hsu
Li, Yang
Condi De Godoi, Fernanda
Gentle, Ian R.
Title Synergy of nanoconfinement and surface oxygen in recrystallization of sulfur melt in carbon nanocapsules and the related Li-S cathode properties
Journal name Journal of Materials Chemistry A   Check publisher's open access policy
ISSN 2050-7496
2050-7488
Publication date 2014-05
Year available 2014
Sub-type Article (original research)
DOI 10.1039/c4ta00314d
Open Access Status Not Open Access
Volume 2
Issue 18
Start page 6439
End page 6447
Total pages 9
Place of publication Cambridge, United Kingdom
Publisher R S C Publications
Collection year 2015
Language eng
Formatted abstract
We studied the recrystallization behaviours of sulfur melt in oxygen-containing carbon nanocapsules (CNCs). The effects of the oxidizing degree and the nanoconfinement of CNCs on sulfur recrystallization were investigated. We performed weak oxidation on CNCs by firstly grafting >C-Cl3 groups via a Friedel-Craft reaction and successive hydrolysis of >C-Cl3; and the strong oxidation was conducted in nitric acid. It is found that the weak oxidation preserved the CNC structure while the strong oxidation damaged the CNC morphology. Electron microscopy, X-ray diffraction, Raman spectroscopy and X-ray absorption spectroscopy were combined to characterize the sulfur crystallites in pristine and oxidized CNCs. The results revealed that the smaller sulfur crystallites preferentially formed in integrated CNCs (preserved nanoscale hollow structure) regardless of oxygen content; while the stronger oxidation and destruction of hollow structures fostered the growth of larger sulfur crystals. These results suggest a possible approach to control the growth of sulfur in carbon by combining oxygen and nanoconfinement effects, and hopefully to tune the related electrochemical properties in Li-S battery cathodes.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Chemistry and Molecular Biosciences
 
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