Nitrogen-Doped Mesoporous Carbon: A Top-Down Strategy to Promote Sulfur Immobilization for Lithium-Sulfur Batteries

ChemSusChem
Xiaohui ZhaoJou-Hyeon Ahn

Abstract

The loss of active sulfur material is a challenge in the application of lithium-sulfur (Li-S) batteries. To immobilize sulfur, a nitrogen-doped mesoporous carbon (PMC) was synthesized with polyaniline (PANi) as the carbon source, which was used for development of Li-S batteries. The nitrogen content and pore system of the PMCs were modulated by varying the pyrolysis temperature to impart good electrochemical properties to the Li-S cells. As a result, the optimal capacity reversibility was obtained with the PMC synthesized at 700 °C that consisted of 12.8 % nitrogen. The enhanced cycle performance of Li-S cells was also validated at high sulfur contents up to 70 % and high C-rates up to 2 C. Furthermore, such sulfur/PMC cathodes could alleviate volume expansion during the discharge process. The results suggest that our synthesized nitrogen-doped PMCs prepared by this top-down strategy are promising materials to immobilize active sulfur in Li-S batteries.

References

May 28, 2009·Nanotechnology·Slavko MentusJaroslav Stejskal
May 19, 2011·Angewandte Chemie·N JayaprakashLynden A Archer
Dec 16, 2011·Nature Materials·Peter G BruceJean-Marie Tarascon
Oct 26, 2012·Accounts of Chemical Research·Arumugam ManthiramYu-Sheng Su
May 8, 2013·Journal of the American Chemical Society·Rafael SilvaTewodros Asefa

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