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Issue 24, 2012
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A microporous–mesoporous carbon with graphitic structure for a high-rate stable sulfur cathode in carbonate solvent-based Li–S batteries

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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.

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

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Publication details

The article was received on 14 Mar 2012, accepted on 25 Apr 2012 and first published on 26 Apr 2012


Article type: Paper
DOI: 10.1039/C2CP40808B
Citation: Phys. Chem. Chem. Phys., 2012,14, 8703-8710
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    A microporous–mesoporous carbon with graphitic structure for a high-rate stable sulfur cathode in carbonate solvent-based Li–S batteries

    D. Wang, G. Zhou, F. Li, K. Wu, G. Q. (. Lu, H. Cheng and I. R. Gentle, Phys. Chem. Chem. Phys., 2012, 14, 8703
    DOI: 10.1039/C2CP40808B

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