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  Towards stable lithium-sulfur battery cathodes by combining physical and chemical confinement of polysulfides in core-shell structured nitrogen-doped carbons

Yan, R., Oschatz, M., & Wu, F. (2020). Towards stable lithium-sulfur battery cathodes by combining physical and chemical confinement of polysulfides in core-shell structured nitrogen-doped carbons. Carbon, 161, 162-168. doi:10.1016/j.carbon.2020.01.046.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-A670-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-42FC-4
Genre: Journal Article

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 Creators:
Yan, Runyu1, Author              
Oschatz, Martin1, Author              
Wu, Feixiang, Author
Affiliations:
1Martin Oschatz, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2364733              

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Free keywords: Lithium-sulfur battery, Sulfur, Porous carbon, Cathode, Polysulfides
 Abstract: Despite intensive research on porous carbon materials as hosts for sulfur in lithium-sulfur battery cathodes, it remains a problem to restrain the soluble lithium polysulfide intermediates for a long-term cycling stability without the use of metallic or metal-containing species. Here, we report the synthesis of nitrogen-doped carbon materials with hierarchical pore architecture and a core-shell-type particle design including an ordered mesoporous carbon core and a polar microporous carbon shell. The initial discharge capacity with a sulfur loading up to 72 wt% reaches over 900 mA h gsulfur−1 at a rate of C/2. Cycling performance measured at C/2 indicates ∼90% capacity retention over 250 cycles. In comparison to other carbon hosts, this architecture not only provides sufficient space for a high sulfur loading induced by the high-pore-volume particle core, but also enables a dual effect of physical and chemical confinement of the polysulfides to stabilize the cycle life by adsorbing the soluble intermediates in the polar microporous shell. This work elucidates a design principle for carbonaceous hosts that is capable to provide simultaneous physical-chemical confinement. This is necessary to overcome the shuttle effect towards stable lithium-sulfur battery cathodes, in the absence of additional membranes or inactive metal-based anchoring materials.

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Language(s): eng - English
 Dates: 2020-01-182020
 Publication Status: Published in print
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Title: Carbon
  Abbreviation : Carbon
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 161 Sequence Number: - Start / End Page: 162 - 168 Identifier: ISSN: 0008-6223