Dye-functionalized carbonaceous interlayer as an efficient lithium polysulfide mediator for high performance lithium-sulfur batteries

[Display omitted] •MG is prepared by eco-friendly hydrothermal process.•Dye-functionalized interlayer confines the shuttle behavior of LiPSs efficiently.•The defects arising from the incorporation of heteroatoms physically absorb LiPSs.•The introduction of N, S containing functional groups enhances...

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Veröffentlicht in:Applied surface science 2024-03, Vol.649, p.159156, Article 159156
Hauptverfasser: Lee, Taewoong, Chae, Seongwook, Heo, Woo Sub, Kang, Haisu, Park, Jae Bin, Park, Yiseul, Park, Tae Hyun, Lee, Jin Hong, Lee, Seung Geol
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Sprache:eng
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Zusammenfassung:[Display omitted] •MG is prepared by eco-friendly hydrothermal process.•Dye-functionalized interlayer confines the shuttle behavior of LiPSs efficiently.•The defects arising from the incorporation of heteroatoms physically absorb LiPSs.•The introduction of N, S containing functional groups enhances the LiPSs conversion.•Li–S batteries with MG interlayer exhibits improved cycle and rate performance. Lithium − sulfur (Li–S) batteries with their high theoretical energy density and abundant resources have been considered as a promising candidate for next-generation energy storage systems. Nonetheless, undesirable diffusion of lithium polysulfides (LiPSs) toward the lithium metal anode in electrolytes during discharge/charge cycles of Li–S batteries, which is known as shuttle behavior of LiPSs, degrades the long-term stability of Li–S batteries and limits their practical applications. Herein, we present dye-functionalized carbonaceous interlayer, in which organic dye containing nitrogen and sulfur functional groups are incorporated into the carbon matrix of a graphitic layer via hydrothermal process. The introduction of such functional interlayer in Li–S batteries reveals that the carbon matrix with various heteroatom moieties can create physically/chemically favorable active sites for trapping LiPSs and enhance LiPSs conversion toward insoluble products of Li2S/Li2S2, resulting in excellent rate capability and long-term stability with high coulombic efficiency. This study emphasizes the potential of organic dyes functionalization and demonstrates enhanced LiPSs conversion and long-term stability of Li–S batteries.
ISSN:0169-4332
1873-5584
1873-5584
DOI:10.1016/j.apsusc.2023.159156