Perfluorinated Ionomer-Enveloped Sulfur Cathodes for Lithium-Sulfur Batteries

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Nafion is known to suppress the polysulfide (PS) shuttle effect, a major obstacle to achieving high capacity and long cycle life for lithium-sulfur batteries. However, elaborate control of the layer's configuration is required for high performance. In this regard, we designed a Nafion-enveloped sulfur cathode, where the Nafion layer is formed on the skin of the cathode, covering its surface and edge while not restricting the porosity. Discharge capacity and efficiency were enhanced with the enveloping configuration, demonstrating suppression of shuttle. The edge protection exhibited better cycling stability than an edge-open configuration. In the absence of the Nafion envelope, charged sulfur concentrated on the top region of the cathode because of the relatively lower PS concentration at the cathode surface. Surprisingly, for the Nafion-enveloped cathode, sulfur was evenly distributed along the cathode, indicating that the configuration imparts a uniform PS concentration within the cathode.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2014-12
Language
English
Article Type
Article
Keywords

POSITIVE ELECTRODE MATERIALS; FUNCTIONAL SEPARATOR; POLYSULFIDE SHUTTLE; PERFORMANCE; COMPOSITE; CELL; ION

Citation

CHEMSUSCHEM, v.7, no.12, pp.3341 - 3346

ISSN
1864-5631
DOI
10.1002/cssc.201402789
URI
http://hdl.handle.net/10203/194474
Appears in Collection
CBE-Journal Papers(저널논문)
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