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Stabilizing effect of polysulfides on lithium metal anodes in sparingly solvating solvents

Stabilisation der Lithiummetall-Anode durch Polysulfide in Sparingly Solvating Solvents
: Reuter, Florian; Huang, Chen-Jui; Hsieh, Yi-Chen; Dörfler, Susanne; Brunklaus, Gunther; Althues, Holger; Winter, Martin; Lin, Shawn D.; Hwang, Bing-Joe; Kaskel, Stefan

Volltext ()

Batteries & supercaps 4 (2021), Nr.2, S.347-358
ISSN: 2566-6223
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
DEAL; 03XP0133D; LiBest
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
DEAL; 03XP0133 A; LiBest
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWS ()
lithium; electrochemistry; interface; lithium sulfur battery; operando analytics

Electrolytes with sparingly polysulfide solubility such as 1.5 M LiTFSI in tetramethylene sulfone (TMS) and 1,1,2,2-tetrafluoroethyl- 2,2,3,3-tetrafluoropropyl ether (TTE) are beneficial for the cycle stability of Li-S pouch cells. In this work, this specific electrolyte system and the role of dissolved polysulfides (PS) in symmetrical Li/Li cells is investigated. By studying varying TMS/TTE volume ratios and polysulfide addition aided by both ex situ and operando spectroscopic as well as microscopic techniques, the positive impact of PS on the lithium plating/ stripping behavior is evaluated. The composition of the solid-electrolyte interphase (SEI) as well as the microscopic morphology differs for electrolytes with PS from those without PS addition. These findings are crucial for the development of electrolytes for cycle-stable Li-S prototype cells.