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Article Abstract
Pyrite FeS, recognized as a promising conversion-type cathode material for high-energy-density batteries, encounters a rapid decline in capacity due to the polysulfide shuttle effect. To tackle these challenges, this study introduces a nonflammable locally concentrated ionic liquid electrolyte (LCILE) composed of lithium bis(fluorosulfonyl)imide (LiFSI), 1-vinylpropyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (AMImTFSI), and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE). This electrolyte manifests a tailored solvation structure with FSI-TFSI dual-anion-dominated aggregates (AGGs), which effectively mitigates the shuttle effect of polysulfides and fosters the formation of a robust dual-anion-derived cathode-electrolyte interphase (CEI) on the FeS cathode. Consequently, the Li/FeS battery sustains a capacity of 627 mAh g after 200 cycles with a high retention rate of 90%, which significantly bolsters the cyclic stability of the FeS cathode. This research offers insight into the design of advanced electrolytes for future Li/FeS batteries.
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