Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 48, Pages 24971-24978Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta08843h
Keywords
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Funding
- R&D Program of the Korea Railroad Research Institute, Republic of 24 Korea - Ministry of Science and ICT [2018M3D1A1058624]
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2018M3D1A1058624]
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A functional separator is designed to improve the utilization of sulfur and to inhibit polysulfide shuttling for high performance lithium-sulfur (Li-S) batteries. Here, we demonstrate a functional separator which is obtained by coating sulfonated UiO-66 metal-organic framework (MOF)/Nafion on a polyethylene separator. This modified separator suppresses the polysulfide diffusion due to a molecular sieving and electrostatic repulsion effect and facilitates the redox kinetics of sulfur conversion because of a fast charge transport by sulfonic groups tethered to the MOF and Nafion. Thus, the Li-S cells based on the MOF/Nafion hybrid-coated separator achieve a discharge capacity of 1127.4 mA h g(-1) at 0.1C, a capacity retention of 66.8% at 3C relative to 0.1C, and a cycling stability of 75.5% over 200 charging/discharging cycles. These values are much greater than those of pristine and Nafion-coated separators, which confirms the superiority of MOF/Nafion hybrid coating layers for the design of functional separators.
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