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Issue 48, 2018
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A core–shell cathode substrate for developing high-loading, high-performance lithium–sulfur batteries

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Abstract

Lithium–sulfur batteries with a high theoretical energy density would be a promising next-generation energy-storage system if their cell-fabrication parameters (e.g., sulfur loading/content and the electrolyte/sulfur ratio) are improved to a practically necessary level. Herein, we report the design of a three-dimensional core–shell carbon substrate, integrating a porous internal core with a conductive external carbon nanofiber shell. Such a carbon substrate encapsulates a high amount of sulfur as the active material core to form a high-loading core–shell cathode, attaining an ultra-high sulfur loading and content of, respectively, 23 mg cm−2 and 75 wt%. With distinguishable internal and external regions, the carbon substrate facilitates the redox reactions and hinders the polysulfide diffusion. Thus, the core–shell cathodes exhibit a high areal capacity and energy density of, respectively, 14 mA h cm−2 and 27 mW h cm−2 during cycling. During resting, they achieve a long shelf-life of one month with a low capacity-fade rate of 0.25% per day.

Graphical abstract: A core–shell cathode substrate for developing high-loading, high-performance lithium–sulfur batteries

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Supplementary files

Article information


Submitted
17 Sep 2018
Accepted
22 Nov 2018
First published
22 Nov 2018

J. Mater. Chem. A, 2018,6, 24841-24847
Article type
Paper
Author version available

A core–shell cathode substrate for developing high-loading, high-performance lithium–sulfur batteries

R. Yu, S. Chung, C. Chen and A. Manthiram, J. Mater. Chem. A, 2018, 6, 24841
DOI: 10.1039/C8TA09059A

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