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2017 | OriginalPaper | Chapter

2. Revealing Localized Electrochemical Transition of Sulfur in Sub-nanometer Confinement

Author : Guangmin Zhou

Published in: Design, Fabrication and Electrochemical Performance of Nanostructured Carbon Based Materials for High-Energy Lithium–Sulfur Batteries

Publisher: Springer Singapore

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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 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.

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next chapter Flexible Nanostructured Sulfur–Carbon Nanotube Cathode with High-Rate Performance for Li–S Batteries

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