A functional separator coated with sulfonated metal- organic framework/Nafion hybrids for Li- S batteries
- Authors
- Kim, Seon Hwa; Yeon, Jeong Seok; Kim, Raekyung; Choi, Kyung Min; Park, Ho Seok
- Issue Date
- Dec-2018
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.48, pp 24971 - 24978
- Pages
- 8
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 6
- Number
- 48
- Start Page
- 24971
- End Page
- 24978
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/4155
- DOI
- 10.1039/c8ta08843h
- ISSN
- 2050-7488
2050-7496
- Abstract
- 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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