Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 47, Pages 15118-15122Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201708746
Keywords
battery; cathode; disulfide; lithium-sulfur battery
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Funding
- Southern California Electrochemical Energy Storage Alliance (SCEESA)
- Materials Research Science and Engineering Center at UCSB [MRSEC NSF DMR 1720256]
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We demonstrate a novel crosslinked disulfide system as a cathode material for Li-S cells that is designed with the two criteria of having only a single point of S-S scission and maximizing the ratio of S-S to the electrochemically inactive framework. The material therefore maximizes theoretical capacity while inhibiting the formation of polysulfide intermediates that lead to parasitic shuttle. The material we report contains a 1:1 ratio of S:C with a theoretical capacity of 609mAhg(-1). The cell gains capacity through 100cycles and has 98% capacity retention thereafter through 200cycles, demonstrating stable, long-term cycling. Raman spectroscopy confirms the proposed mechanism of disulfide bonds breaking to form a S-Li thiolate species upon discharge and reforming upon charge. Coulombic efficiencies near 100% for every cycle, suggesting the suppression of polysulfide shuttle through the molecular design.
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