In situ wrapping of the cathode material in lithium-sulfur batteries

Chenji Hu, Hongwei Chen (), Yanbin Shen, Di Lu, Yanfei Zhao, An-Hui Lu, Xiaodong Wu, Wei Lu and Liwei Chen ()
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Chenji Hu: Chinese Academy of Sciences
Hongwei Chen: Huaqiao University
Yanbin Shen: Chinese Academy of Sciences
Di Lu: Chinese Academy of Sciences
Yanfei Zhao: Chinese Academy of Sciences
An-Hui Lu: Dalian University of Technology
Xiaodong Wu: Chinese Academy of Sciences
Wei Lu: Chinese Academy of Sciences
Liwei Chen: Chinese Academy of Sciences

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract While lithium–sulfur batteries are poised to be the next-generation high-density energy storage devices, the intrinsic polysulfide shuttle has limited their practical applications. Many recent investigations have focused on the development of methods to wrap the sulfur material with a diffusion barrier layer. However, there is a trade-off between a perfect preassembled wrapping layer and electrolyte infiltration into the wrapped sulfur cathode. Here, we demonstrate an in situ wrapping approach to construct a compact layer on carbon/sulfur composite particles with an imperfect wrapping layer. This special configuration suppresses the shuttle effect while allowing polysulfide diffusion within the interior of the wrapped composite particles. As a result, the wrapped cathode for lithium–sulfur batteries greatly improves the Coulombic efficiency and cycle life. Importantly, the capacity decay of the cell at 1000 cycles is as small as 0.03% per cycle at 1672 mA g–1.

Date: 2017
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DOI: 10.1038/s41467-017-00656-8

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