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Fluorinated Ether Based Electrolyte for High-Energy Lithium-Sulfur Batteries: Li+ Solvation Role behind Reduced Polysulfide Solubility

Sara Drvarič Talian ; Steffen Jeschke (Institutionen för fysik, Kondenserade materiens fysik (Chalmers)) ; Alen Vizintin ; Klemen Pirnat ; Iztok Arčon ; Giuliana Aquilanti ; Patrik Johansson (Institutionen för fysik, Kondenserade materiens fysik (Chalmers)) ; Robert Dominko
Chemistry of Materials (0897-4756). Vol. 29 (2017), 23, p. 10037-10044.
[Artikel, refereegranskad vetenskaplig]

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.



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Denna post skapades 2018-01-02. Senast ändrad 2018-01-11.
CPL Pubid: 254216

 

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