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The critical role of lithium nitrate in the gas evolution of lithium–sulfur batteries

Jozwiuk, Anna; Berkes, Balázs B.; Weiß, Thomas; Sommer, Heino; Janekac, Jürgen; Brezesinski, Torsten

Abstract (englisch):
Sulfur–carbon composites are promising next generation cathode materials for high energy density lithium batteries and thus, their discharge and charge properties have been studied with increasing intensity in recent years. While the sulfur-based redox reactions are reasonably well understood, the knowledge of deleterious side reactions in lithium–sulfur batteries is still limited. In particular, the gassing behavior has not yet been investigated, although it is known that lithium metal readily reacts with the commonly used ethereal electrolytes. Herein, we describe, for the first time, gas evolution in operating lithium–sulfur cells with a diglyme-based electrolyte and evaluate the effect of the polysulfide shuttle-suppressing additive LiNO3. The use of the combination of two operando techniques (pressure measurements and online continuous flow differential electrochemical mass spectrometry coupled with infrared spectroscopy) demonstrates that the additive dramatically reduces, but does not completely eliminate gassing. The major increase in pressure occurs during charge, immediately after fresh lithium is deposited, but there are differences in gas generation during cycling depending on the addition of LiNO3. ... mehr

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Volltext §
DOI: 10.5445/IR/1000058912
DOI: 10.1039/C6EE00789A
Zitationen: 145
Zitationen: 151
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 1754-5692, 1754-5706
KITopen-ID: 1000058912
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in Energy & environmental science
Verlag Royal Society of Chemistry (RSC)
Band 9
Seiten 2603-2608
Bemerkung zur Veröffentlichung RSC geförderter Open Access-Artikel
Nachgewiesen in Dimensions
Web of Science
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