Fluorinated Ether Based Electrolyte for High-Energy Lithium-Sulfur Batteries: Li+ Solvation Role behind Reduced Polysulfide Solubility
Artikel i vetenskaplig tidskrift, 2017
By employing new electrolytes, the polysulfide shuttle phenomenon, one of the main problems of lithium-sulfur (Li-S) batteries, can be significantly reduced. Here we present excellent Coulombic efficiencies as well as adequate performance of high-energy Li-S cells by the use of a fluorinated ether (TFEE) based electrolyte at low electrolyte loading. The observed altered discharge profile was investigated both by electrochemical experiments and an especially tailored COSMO-RS computational approach, while the details of the discharge mechanism were elucidated by two operando techniques: XANES and UV-vis spectroscopy. A significant decrease of polysulfide solubility compared to tetraglyme is due to different Li+ solvation mode.
Författare
Sara Drvarič Talian
Kemijski Inštitut
Univerza V Ljubljani
Steffen Jeschke
Chalmers, Fysik, Kondenserade materiens fysik
Alen Vizintin
Kemijski Inštitut
Klemen Pirnat
Kemijski Inštitut
Arcˇon Iztok
Institut Jožef Stefan
University of Nova Gorica
Giuliana Aquilanti
Elettra Sincrotrone Trieste
Patrik Johansson
Chalmers, Fysik, Kondenserade materiens fysik
R. Dominko
Kemijski Inštitut
Alistore - European Research Institute
Univerza V Ljubljani
Chemistry of Materials
0897-4756 (ISSN) 1520-5002 (eISSN)
Vol. 29 23 10037-10044Styrkeområden
Transport
Energi
Materialvetenskap
Ämneskategorier
Atom- och molekylfysik och optik
DOI
10.1021/acs.chemmater.7b03654