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

被引:43
作者
D'Angelo, Anthony J. [1 ]
Panzer, Matthew J. [1 ]
机构
[1] Tufts Univ, Dept Chem & Biol Engn, 4 Colby St, Medford, MA 02155 USA
关键词
POLYMER ELECTROLYTE; CONDUCTIVITY; TETRAGLYME; LIQUIDS; HARD;
D O I
10.1021/acs.jpcb.6b10125
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:890 / 895
页数:6
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