Ion Dynamics of Monomeric Ionic Liquids Polymerized In Situ within Silica Nanopores

被引:14
作者
Kinsey, Thomas [1 ]
Glynn, Kaitlin [1 ]
Cosby, Tyler [2 ]
Iacob, Ciprian [3 ,4 ]
Sangoro, Joshua [1 ]
机构
[1] Univ Tennessee, Dept Chem & Biomol Engn, Knoxville, TN 37916 USA
[2] US Naval Acad, Dept Chem, Annapolis, MD 21402 USA
[3] Natl Res & Dev Inst Cryogen & Isotop Technol, Valcea 240050, Romania
[4] Karlsruhe Inst Technol KIT, Inst Chem Technol & Polymer Chem, D-76128 Karlsruhe, Germany
基金
美国国家科学基金会;
关键词
polymerized ionic liquids; nanoconfinement; ion dynamics; molecular conformations; Raman spectroscopy; broadband dielectric spectroscopy; MOLECULAR-STRUCTURE; SEGMENTAL DYNAMICS; HIGH-PRESSURE; FREE-VOLUME; CONFINEMENT; TRANSPORT; ANION; RAMAN; CONDUCTIVITY; TEMPERATURE;
D O I
10.1021/acsami.0c12381
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Polymerized ionic liquids are a promising class of versatile solid-state electrolytes for applications ranging from electrochemical energy storage to flexible smart materials that remain limited by their relatively low ionic conductivities compared to conventional electrolytes. Here, we show that the in situ polymerization of the vinyl cationic monomer, 1-ethyl-3-vinylimidazolium with the bis(trifluoromethanesulfonyl)imide counteranion, under nanoconfinement within 7.5 +/- 1.0 nm diameter nanopores results in a nearly 1000-fold enhancement in the ionic conductivity compared to the material polymerized in bulk. Using insights from broadband dielectric and Raman spectroscopic techniques, we attribute these results to the role of confinement on molecular conformations, ion coordination, and subsequently the ionic conductivity in the polymerized ionic liquid. These results contribute to the understanding of the dynamics of nanoconfined molecules and show that in situ polymerization under nanoscale geometric confinement is a promising path toward enhancing ion conductivity in polymer electrolytes.
引用
收藏
页码:44325 / 44334
页数:10
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