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Micro- and mesoporous carbide-derived carbon prepared by a sacrificial template method in high performance lithium sulfur battery cathodes

 
: Oschatz, Martin; Lee, J.T.; Kim, H.; Borchardt, Lars; Cho, W.I.; Ziegler, C.; Kaskel, Stefan; Yushin, G.; Nickel, Winfried

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Journal of materials chemistry. A, Materials for energy and sustainability 2 (2014), Nr.41, S.17649-17654
ISSN: 2050-7488
ISSN: 2050-7496
Bundesministerium für Wirtschaft und Technologie BMWi
MaLiSu
Nanomaterials for future generation lithium sulfur batteries
National Science Foundation NSF
DMR 0922776
Englisch
Zeitschriftenaufsatz
Fraunhofer IWS ()
carbide-derived carbon; CDC; lithium sulfur battery cathodes; carbon materials

Abstract
Polymer-based carbide-derived carbons (CDCs) with combined micro- and mesopores are prepared by an advantageous sacrificial templating approach using poly(methylmethacrylate) (PMMA) spheres as the pore forming material. Resulting CDCs reveal uniform pore size and pore shape with a specific surface area of 2434 m2 g−1 and a total pore volume as high as 2.64 cm3 g−1. The bimodal CDC material is a highly attractive host structure for the active material in lithium–sulfur (Li–S) battery cathodes. It facilitates the utilization of high molarity electrolytes and therefore the cells exhibit good rate performance and stability. The cathodes in the 5 M lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) electrolyte show the highest discharge capacities (up to 1404 mA h gs−1) and capacity retention (72% after 50 cycles at C/5). The unique network structure of the carbon host enables uniform distribution of sulfur through the conductive media and at the same time it facilitates rapid access for the electrolyte to the active material.

: http://publica.fraunhofer.de/dokumente/N-379477.html