A microporous–mesoporous carbon with graphitic structure for a high-rate stable sulfur cathode in carbonate solvent-based Li–S batteries

Wang, Da-Wei, Zhou, Guangmin, Li, Feng, Wu, Kuang-Hsu, Lu, Gao Qing (Max), Cheng, Hui-Ming and Gentle, Ian R. (2012) A microporous–mesoporous carbon with graphitic structure for a high-rate stable sulfur cathode in carbonate solvent-based Li–S batteries. Physical Chemistry Chemical Physics, 14 24: 8703-8710.


Author Wang, Da-Wei
Zhou, Guangmin
Li, Feng
Wu, Kuang-Hsu
Lu, Gao Qing (Max)
Cheng, Hui-Ming
Gentle, Ian R.
Title A microporous–mesoporous carbon with graphitic structure for a high-rate stable sulfur cathode in carbonate solvent-based Li–S batteries
Journal name Physical Chemistry Chemical Physics   Check publisher's open access policy
ISSN 1463-9076
1463-9084
Publication date 2012-04-26
Sub-type Article (original research)
DOI 10.1039/c2cp40808b
Volume 14
Issue 24
Start page 8703
End page 8710
Total pages 8
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Collection year 2013
Language eng
Abstract A microporous–mesoporous carbon with graphitic structure was developed as a matrix for the sulfur cathode of a Li–S cell using a mixed carbonate electrolyte. Sulfur was selectively introduced into the carbon micropores by a melt adsorption–solvent extraction strategy. The micropores act as solvent-restricted reactors for sulfur lithiation that promise long cycle stability. The mesopores remain unfilled and provide an ion migration pathway, while the graphitic structure contributes significantly to low-resistance electron transfer. The selective distribution of sulfur in micropores was characterized by X-ray photoelectron spectroscopy (XPS), nitrogen cryosorption analysis, transmission electron microscopy (TEM), X-ray powder diffraction and Raman spectroscopy. The high-rate stable lithiation–delithiation of the carbon–sulfur cathode was evaluated using galvanostatic charge–discharge tests, cyclic voltammetry and electrochemical impedance spectroscopy. The cathode is able to operate reversibly over 800 cycles with a 1.8 C discharge–recharge rate. This integration of a micropore reactor, a mesopore ion reservoir, and a graphitic electron conductor represents a generalized strategy to be adopted in research on advanced sulfur cathodes.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Mon, 18 Jun 2012, 11:31:05 EST by Lucy O'Brien on behalf of School of Chemistry & Molecular Biosciences