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Title:Polysulfides formation in different electrolytes from the perspective of X-ray absorption spectroscopy
Authors:ID Dominko, Robert (Author)
ID Vižintin, Alen (Author)
ID Aquilanti, Giuliana (Author)
ID Stievano, Lorenzo (Author)
ID Joseph Helen, Maria (Author)
ID Reddy Munnangi, Anji (Author)
ID Fichtner, Maximilian (Author)
ID Arčon, Iztok (Author)
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Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Li-S batteries are promising energy storage technology for the future, however there two major problems remained which need to be solved before successful commercialization. Capacity fading due to polysulfide shuttle and corrosion of lithium metal are directly connected with the type and quantity of electrolyte used in the cells. Several recent works show dependence of the electrochemical behavior of Li-S batteries on type of the electrolyte. In this work we compare and discuss a discharge mechanism of sulfur conversion in three different electrolytes based on measurements with sulfur K-edge XAS. The sulfur conversion mechanism in the ether based electrolytes, the most studied type of solvents in the Li-S batteries, which are enabling high solubility of polysulfides are compared with the fluorinated ether based electrolytes with a reduced polysulfide solubility and in carbonate based electrolytes with the sulfur confined into a ultramicroporous carbon. In all three cases the sulfur reduction proceeds through polysulfide intermediate phases with a difference on the type polysulfides detected at different steps of discharge.
Keywords:Li-S batteries, operando sulphur K-edge XANES, EXAFS, Li-polysulphides
Year of publishing:2018
Number of pages:str. A5014-A5019
Numbering:#Vol. #165, #no. #1
PID:20.500.12556/RUNG-4134 New window
COBISS.SI-ID:6296602 New window
ISSN on article:1945-7111
DOI:10.1149/2.0151801jes New window
Publication date in RUNG:01.06.2018
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Record is a part of a journal

Title:Journal of the Electrochemical Society
Publisher:Electrochemical Society
Year of publishing:2018
COBISS.SI-ID:22698791 New window

Secondary language

Keywords:struktura snovi, spektroskopija, elektroliti