Journal
CHEMSUSCHEM
Volume 7, Issue 6, Pages 1655-1661Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201301287
Keywords
cell configuration; leaf; lithium-sulfur batteries; nanostructures; renewable resources
Funding
- Seven One Limited [UTA12-000613]
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Attracted by the unique tissue and functions of leaves, a natural carbonized leaf (CL) is presented as a polysulfide diffusion inhibitor in lithium-sulfur (Li-S) batteries. The CL that is covered on the pure sulfur cathode effectively suppresses the polysulfide shuttling mechanism and enables the use of pure sulfur as the cathode. A low charge resistance and a high discharge capacity of 1320mAhg(-1) arise from the improved cell conductivity due to the innately integral conductive carbon network of the CL. The unique microstructure of CL leads to a high discharge/charge efficiency of >98%, low capacity fade of 0.18% per cycle, and good long-term cyclability over 150cycles. The structural gradient and the micro/mesoporous adsorption sites of CL effectively intercept/trap the migrating polysulfides and facilitate their reutilization. The green CL polysulfide diffusion inhibitor thus offers a viable approach for developing high-performance lithium-sulfur batteries.
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