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Space-confinement and chemisorption co-involved in encapsulation of sulfur for lithium–sulfur batteries with exceptional cycling stability

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Abstract

The practical applications of lithium–sulfur (Li–S) batteries have been impeded by short cycling life and low sulfur utilization, resulting from the dissolution of intermediate lithium polysulfides into electrolytes and the large volume variation during cycling. This study presents a dual-confinement strategy to efficiently entrap lithium polysulfides and alleviate large volume variation by using N-doped tube-in-tube structured carbon tubes anchored on a 3D scaffold of graphene foam through the synergistic effect of spatial restriction and chemical interaction. This unique carbon hybrid structure provides sufficient empty space to confine sulfur with high loading, accommodate large volume changes during lithiation and de-lithiation, and facilitate better immobilization of polysulfides as demonstrated by first-principles calculations. Therefore, enhanced capacities, ultralong-cycling stability, and improved rate capability even with a high sulfur loading (∼5.6 mg cm−2) could be achieved.

Graphical abstract: Space-confinement and chemisorption co-involved in encapsulation of sulfur for lithium–sulfur batteries with exceptional cycling stability

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Publication details

The article was received on 29 Sep 2017, accepted on 25 Oct 2017 and first published on 25 Oct 2017


Article type: Communication
DOI: 10.1039/C7TA08620B
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Space-confinement and chemisorption co-involved in encapsulation of sulfur for lithium–sulfur batteries with exceptional cycling stability

    J. Wang, H. Yang, C. Guan, J. Liu, Z. Chen, P. Liang and Z. Shen, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA08620B

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