title: Enhanced Lithium Ion Transport in Poly(ethylene glycol) Diacrylate-Supported Solvate Ionogel Electrolytes via Chemically Cross-linked Ethylene Oxide Pathways.
abstract: Lithium-ion solvate ionic liquids (SILs), consisting of complexed Li+cations and a weakly basic anion, represent an emergent class of nonvolatile liquid electrolytes suitable for lithium-based electrochemical energy storage. In this report, solid-state, flexible solvate ionogel electrolytes are synthesized via UV-initiated free radical polymerization/cross-linking of poly(ethylene glycol) diacrylate (PEGDA) in situ within the [Li(G4)][TFSI] electrolyte, which is formed by an equimolar mixture of lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) and tetraglyme (G4). Ion diffusivity measurements reveal enhanced Li+diffusion in PEGDA-supported solvate ionogels, as compared to poly(methyl methacrylate)-supported gels that lack ethylene oxide chains. At 21 vol% PEGDA, a maximum Li+transport number of 0.58 and a room temperature ionic conductivity of 0.43 mS/cm have been achieved in a solvate ionogel electrolyte that exhibits an elastic modulus of 0.47 MPa. These results demonstrate the importance of polymer scaffold selection on solvate ionogel electrolyte performance for advanced lithium-based batteries.
authors.affiliation: Department of Chemical & Biological Engineering Tufts University , 4 Colby Street, Medford, Massachusetts 02155, United States.
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: D'Angelo
authors.affiliation: Department of Chemical & Biological Engineering Tufts University , 4 Colby Street, Medford, Massachusetts 02155, United States.
authors.forename: Matthew J
authors.identifier: 0000-0002-1741-8548
authors.initials: MJ
authors.lastname: Panzer