A rationally designed polysulfide-trapping interface on the polymeric separator for high-energy Li–S batteries

Chi Hao Chang, Sheng Heng Chung, Sanjay Nanda, Arumugam Manthiram

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

A coating layer consisting of a layer of graphene oxide (GO) inserted in between two layers of multi-walled carbon nanotubes (MWCNT) forms a multifunctional polysulfide-trapping triple-interface on the polymeric separator for lithium–sulfur (Li–S) batteries. The top and bottom highly conductive MWCNT interfaces are able to physically inhibit polysulfide diffusion and effectively reutilize the trapped active material during cycling. The inserted ultrathin GO layer with negatively charged carboxyl groups, on the other hand, electrostatically repels the migrating polysulfide anions. The stacked GO sheets also extensively prolong the migration routes of the polysulfides. Additionally, the “buffer zones” interspersed within the triple-interface accommodate the migrating polysulfides. Thus, the sandwiched separators enable Li–S cells with a high-sulfur-loading (10 mg cm−2), high areal capacity (10.9 mA h cm−2), and stable cycling ability even though the coating layer is ultra-thin (∼17 μm) and light-weight (∼0.23 mg cm−2).

Original languageEnglish
Pages (from-to)72-78
Number of pages7
JournalMaterials Today Energy
Volume6
DOIs
Publication statusPublished - 2017 Dec 1

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science (miscellaneous)
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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