A Polysulfide-Trapping Interface for Electrochemically Stable Sulfur Cathode Development

Sheng Heng Chung, Pauline Han, Arumugam Manthiram

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Lithium-sulfur (Li-S) cells have a strong edge to become an inexpensive, high-capacity rechargeable battery system. However, currently, several prohibitive challenges occur within the sulfur core, especially the polysulfide-diffusion problem. To address these scientific issues, we present here a boron-doped multiwalled carbon nanotube coated separator (B-CNT-coated separator). The B-CNT-coated separator creates a polysulfide trap between the pure sulfur cathode and the polymeric separator as a "polysulfide-trapping interface, " stabilizing the active material and allowing the dissolved polysulfides to activate the bulk sulfur cores. Therefore, the dissolved polysulfides change from causing fast capacity fade to assisting with the activation of bulk sulfur clusters in pure sulfur cathodes. Moreover, the heteroatom-doped polysulfide-trapping interface is currently one of the missing pieces of carbon-coated separators, which might inspire further studies in its effect and battery chemistry. Li-S cells employing B-CNT-coated separators (i) exhibit improved cyclability at various cycling rates from 0.2C to 1.0C rate and (ii) attain a high capacity retention rate of 60% with a low capacity fade rate of 0.04% cycle-1 after 500 cycles. We believe that our B-CNT-coated separator could light up a new research area for integrating heteroatom-doped carbon into the flexible, lightweight, carbon-coated separator.

Original languageEnglish
Pages (from-to)4709-4717
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number7
DOIs
Publication statusPublished - 2016 Feb 24

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Polysulfides
Separators
Sulfur
Cathodes
Carbon
Lithium
Boron
Secondary batteries
polysulfide
Multiwalled carbon nanotubes (MWCN)
Chemical activation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

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abstract = "Lithium-sulfur (Li-S) cells have a strong edge to become an inexpensive, high-capacity rechargeable battery system. However, currently, several prohibitive challenges occur within the sulfur core, especially the polysulfide-diffusion problem. To address these scientific issues, we present here a boron-doped multiwalled carbon nanotube coated separator (B-CNT-coated separator). The B-CNT-coated separator creates a polysulfide trap between the pure sulfur cathode and the polymeric separator as a {"}polysulfide-trapping interface, {"} stabilizing the active material and allowing the dissolved polysulfides to activate the bulk sulfur cores. Therefore, the dissolved polysulfides change from causing fast capacity fade to assisting with the activation of bulk sulfur clusters in pure sulfur cathodes. Moreover, the heteroatom-doped polysulfide-trapping interface is currently one of the missing pieces of carbon-coated separators, which might inspire further studies in its effect and battery chemistry. Li-S cells employing B-CNT-coated separators (i) exhibit improved cyclability at various cycling rates from 0.2C to 1.0C rate and (ii) attain a high capacity retention rate of 60{\%} with a low capacity fade rate of 0.04{\%} cycle-1 after 500 cycles. We believe that our B-CNT-coated separator could light up a new research area for integrating heteroatom-doped carbon into the flexible, lightweight, carbon-coated separator.",
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A Polysulfide-Trapping Interface for Electrochemically Stable Sulfur Cathode Development. / Chung, Sheng Heng; Han, Pauline; Manthiram, Arumugam.

In: ACS Applied Materials and Interfaces, Vol. 8, No. 7, 24.02.2016, p. 4709-4717.

Research output: Contribution to journalArticle

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