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

Univerza V Ljubljani

National Institute of Chemistry Ljubljana

Steffen Jeschke

Chalmers, Fysik, Kondenserade materiens fysik

Alen Vizintin

National Institute of Chemistry Ljubljana

Klemen Pirnat

National Institute of Chemistry Ljubljana

Arcˇon Iztok

Institut Jozef Stefan

University of Nova Gorica

Giuliana Aquilanti

Elettra Sincrotrone Trieste

Patrik Johansson

Chalmers, Fysik, Kondenserade materiens fysik

R. Dominko

Univerza V Ljubljani

National Institute of Chemistry Ljubljana

Alistore - European Research Institute

Chemistry of Materials

0897-4756 (ISSN) 1520-5002 (eISSN)

Vol. 29 23 10037-10044

Styrkeområden

Transport

Energi

Materialvetenskap

Ämneskategorier

Atom- och molekylfysik och optik

DOI

10.1021/acs.chemmater.7b03654