Interaction mechanism between a functionalized protective layer and dissolved polysulfide for extended cycle life of lithium sulfur batteries

Wook Ahn, Sung Nam Lim, Dong Un Lee, Kwang Bum Kim, Zhongwei Chen, Sun Hwa Yeon

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

To improve the cycle life of Li-S rechargeable batteries, chemically dispersed nanocarbon materials are usually employed as adsorbents and conductive matrices for cathodic nano-sized sulfur materials. Herein, a new assembly for Li-S cells is developed by introducing a montmorillonite (MMT) ceramic protective film to form an ion selective separator. The effect of the MMT-coated separator and the reaction mechanism between MMT and polysulfides are characterized via Raman and zeta potential analyses. The utilization of the MMT coated separator enables the minimization of the shuttle effect by preventing the diffusion of polysulfide. The best discharge capacity and cycle life are obtained with the MMT coated separator in a sulfur-MWCNT composite cathode, resulting in a discharge capacity of 1382 mA h g-1 at a current density of 100 mA g-1 and 924 mA h g-1 after 200 cycles. The Li-S cell using the nano-sized sulfur-MWCNT composite and the MMT-coated separator shows significantly excellent electrochemical performance.

Original languageEnglish
Pages (from-to)9461-9467
Number of pages7
JournalJournal of Materials Chemistry A
Volume3
Issue number18
DOIs
Publication statusPublished - 2015 May 14

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Bentonite
Polysulfides
Clay minerals
Life cycle
Separators
Sulfur
Secondary batteries
Composite materials
Protective coatings
Zeta potential
Adsorbents
Lithium sulfur batteries
polysulfide
Cathodes
Current density
Ions

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

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abstract = "To improve the cycle life of Li-S rechargeable batteries, chemically dispersed nanocarbon materials are usually employed as adsorbents and conductive matrices for cathodic nano-sized sulfur materials. Herein, a new assembly for Li-S cells is developed by introducing a montmorillonite (MMT) ceramic protective film to form an ion selective separator. The effect of the MMT-coated separator and the reaction mechanism between MMT and polysulfides are characterized via Raman and zeta potential analyses. The utilization of the MMT coated separator enables the minimization of the shuttle effect by preventing the diffusion of polysulfide. The best discharge capacity and cycle life are obtained with the MMT coated separator in a sulfur-MWCNT composite cathode, resulting in a discharge capacity of 1382 mA h g-1 at a current density of 100 mA g-1 and 924 mA h g-1 after 200 cycles. The Li-S cell using the nano-sized sulfur-MWCNT composite and the MMT-coated separator shows significantly excellent electrochemical performance.",
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Interaction mechanism between a functionalized protective layer and dissolved polysulfide for extended cycle life of lithium sulfur batteries. / Ahn, Wook; Lim, Sung Nam; Lee, Dong Un; Kim, Kwang Bum; Chen, Zhongwei; Yeon, Sun Hwa.

In: Journal of Materials Chemistry A, Vol. 3, No. 18, 14.05.2015, p. 9461-9467.

Research output: Contribution to journalArticle

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AU - Lim, Sung Nam

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AU - Kim, Kwang Bum

AU - Chen, Zhongwei

AU - Yeon, Sun Hwa

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