Enhanced Lithium Ion Transport in Poly(ethylene glycol) Diacrylate-Supported Solvate Ionogel Electrolytes via Chemically Cross-linked Ethylene Oxide Pathways

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 syn...

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Veröffentlicht in:The journal of physical chemistry. B 2017-02, Vol.121 (4), p.890-895
Hauptverfasser: D’Angelo, Anthony J, Panzer, Matthew J
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:1520-6106
1520-5207
DOI:10.1021/acs.jpcb.6b10125