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Boosting High-Performance in Lithium–Sulfur Batteries via Dilute Electrolyte
journal contribution
posted on 2020-06-04, 18:38 authored by Feixiang Wu, Fulu Chu, Guillermo A. Ferrero, Marta Sevilla, Antonio B. Fuertes, Oleg Borodin, Yan Yu, Gleb YushinPolysulfide
shuttle effects, active material losses, formation
of resistive surface layers, and continuous electrolyte consumption
create a major barrier for the lightweight and low-cost lithium–sulfur
(Li–S) battery adoption. Tuning electrolyte composition by
using additives and most importantly by substantially increasing electrolyte
molarity was previously shown to be one of the most effective strategies.
Contrarily, little attention has been paid to dilute and super-diluted
LiTFSI/DME/DOL/LiNO3 based-electrolytes, which have been
thought to aggravate the polysulfide dissolution and shuttle effects.
Here we challenge this conventional wisdom and demonstrate outstanding
capabilities of a dilute (0.1 mol L–1 of LiTFSI
in DME/DOL with 1 wt. % LiNO3) electrolyte to enable better
electrode wetting, greatly improved high-rate capability, and stable
cycle performance for high sulfur loading cathodes and low electrolyte/sulfur
ratio in Li–S cells. Overall, the presented study shines light
on the extraordinary ability of such electrolyte systems to suppress
short-chain polysulfide dissolution and polysulfide shuttle effects.
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Keywords
material lossesTuning electrolyte compositioncycle performancepolysulfide shuttle effectsshort-chain polysulfide dissolutionDMEpolysulfide dissolutionshuttle effectssulfur loading cathodessurface layers1 wtelectrolyte consumptionelectrolyte systemsBoosting High-PerformanceDilute Electrolyte Polysulfide shuttle effectselectrolyte molarity