Enabling a Revolution, page-6

Tin,I may have found the " key issue "

Read more: Janus separator: A new opportunity to improve lithium-sulfur batteries

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0	Accordingly, as the scientists at Tsinghua University report in Advanced Science ("Janus Separator of Polypropylene-Supported Cellular Graphene Framework for Sulfur Cathodes with High Utilization in Lithium–Sulfur Batteries"), their Janus Separator is made up of two different layers. The one is a polymeric porous membrane and the other on is a thin film of nanostructured carbon.
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Read more: Janus separator: A new opportunity to improve lithium-sulfur batteries​

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