title: Ionic liquid enabled FeS2 for high-energy-density lithium-ion batteries.
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.
authors.affiliation: Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO, 80309, USA.
authors.forename: Tyler
authors.initials: T
authors.lastname: Evans
authors.forename: Daniela Molina
authors.initials: DM
authors.lastname: Piper
authors.forename: Seul Cham
authors.initials: SC
authors.lastname: Kim
authors.forename: Sang Sub
authors.initials: SS
authors.lastname: Han
authors.forename: Vinay
authors.initials: V
authors.lastname: Bhat
authors.forename: Kyu Hwan
authors.initials: KH
authors.lastname: Oh
authors.forename: Se-Hee
authors.initials: SH
authors.lastname: Lee
mesh_terms: D058266:Dielectric Spectroscopy; D011211:Electric Power Supplies; D004566:Electrodes; D005583:Fourier Analysis; D006845:Hydrocarbons, Fluorinated / Q000737:chemistry*; D007094:Imides / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D007477:Ions / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D013057:Spectrum Analysis; D013440:Sulfides / Q000737:chemistry*
chemical_list: D006845:Hydrocarbons, Fluorinated; D007094:Imides; D052578:Ionic Liquids; D007477:Ions; D013440:Sulfides; C575299:bis(trifluoromethanesulfonyl)imide; C011342:pyrite; D008094:Lithium; D007501:Iron
keywords: bis(trifluoromethanesulfonyl)imide; cathodes; polysulfide dissolution; pyrite; room temperature ionic liquids