Ionic Liquid Enabled FeS<sub>2</sub> for High‐Energy‐Density Lithium‐Ion Batteries
Tyler Evans(University of Colorado Boulder), Daniela Molina Piper(University of Colorado Boulder), Seul Cham Kim(Seoul National University), Sang Sub Han(Seoul National University), Vinay S. Bhat(Barber-Nichols (United States)), Kyu Hwan Oh(Seoul National University), Se‐Hee Lee(University of Colorado Boulder)
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Abstract
High-energy-density FeS2 cathodes en-abled by a bis(trifluoromethanesulfonyl)imide (TFSI-) anion-based room temperature ionic liquid (RTIL) electrolyte are demonstrated. A TFSI-based ionic liquid (IL) significantly mitigates polysulfide dissolution, and therefore the parasitic redox shuttle mechanism, that plagues sulfur-based electrode chemistries. FeS2 stabilization with a TFSI(-) -based IL results in one of the highest energy density cathodes, 542 W h kg(-1) (normalized to cathode composite mass), reported to date.
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