Journal
MATERIALS TODAY ENERGY
Volume 6, Issue -, Pages 72-78Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2017.09.001
Keywords
Lithium-sulfur batteries; Coated separators; Polysulfide trapping; Sulfur loading; Synergistic effects
Funding
- Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy (EERE) [DE-EE0007218]
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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 lithiumesulfur (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 (similar to 17 mu m) and light-weight (similar to 0.23 mg cm(-2)). (C) 2017 Elsevier Ltd. All rights reserved.
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