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In-situ creating a macro-chamber for S conversion reactions in Lithium-Sulfur batteries

Abstract

Lithium-sulfur (Li-S) battery has been identified as the most promising options for energy storage, because of its high theoretical capacity and environmental friendliness. However, the low utilization of sulfur in the cathode and the “shuttle effect” which leads to poor cycle life restricts the realization of Li-S batteries. Here, we have designed a new type of rGO-supported TiN-nanoparticle (TiN/rGO) multifunction cover layer, with an in-situ synthesis method. The excellent blocking effect of lithium polysulfides, outstanding catalytic ability and superior electron conductivity of the TiN/rGO cover could create a macro-chamber for S conversion reactions (MCSR) at a macroscopic scale. This macro-chamber, in which whatever pure sulfur powders or sulfur-based composites can be directly adopted as active materials, could significantly reduce the “shuttle effect” and increase the sulfur utilization for lithium-sulfur battery. When the S powder loading is as high as 8 mg cm-2, the battery continues to deliver outstanding electrochemical performance and cycling stability. With such a MCSR design, the indispensable support materials for S and additives for electrolyte in current Li-S cells will be no longer need.

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Publication details

The article was received on 20 Sep 2017, accepted on 10 Oct 2017 and first published on 11 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA08309B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    In-situ creating a macro-chamber for S conversion reactions in Lithium-Sulfur batteries

    D. Deng, J. Lei, F. Xue, C. Bai, X. Lin, J. Ye, M. Zheng and Q. Dong, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08309B

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