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High Sulfur Content Material with Stable Cycling in Lithium‐Sulfur Batteries
Author(s) -
Preefer Molleigh B.,
Oschmann Bernd,
Hawker Craig J.,
Seshadri Ram,
Wudl Fred
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201708746
Subject(s) - polysulfide , faraday efficiency , sulfur , cathode , raman spectroscopy , cycling , lithium (medication) , materials science , chemical engineering , chemistry , disulfide bond , electrochemistry , electrode , electrolyte , organic chemistry , medicine , archaeology , history , biochemistry , physics , engineering , optics , endocrinology
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 609 mAh g −1 . The cell gains capacity through 100 cycles and has 98 % capacity retention thereafter through 200 cycles, 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.