EMIHSO4-Based Polymer Ionic Liquid Electrolyte for Electrochemical Capacitors

Stretching Ion Conducting Polymer Electrolytes: In-Situ Correlation of Mechanical, Ionic Transport, and Optical Properties

“…Ionic conductivity measurements of PEO/EMIBF 4 polymer electrolytes emphasize an increase in ionic conductivity linearly with EMIBF 4 concentration, with conductivities ranging from .1 to 1.6 mS/cm. These conductivities are consistent with that observed for other IL polymer conjugates, [27][28][29][30][31] including the observed values of .5-.6 mS/cm for ∼30% IL PEO/EMIBF 4 polymers observed by Lewandowski et al 30 Raman spectra were collected both for pure and mixed PEO/EMIBF 4 (Figures 1b). The PEO and EMIBF 4 Raman spectra are consistent with those found in literature for these materials, and PEO/EMIBF 4 Raman spectra clearly show a combination of both the PEO and EMIBF 4 spectra.…”

“…[27][28][29][30][31]36,37 However, there has been little characterization of the mechanical-chemical effects in such materials despite their basic function as mechanical interfaces between the z E-mail: cary.l.pint@vanderbilt.edu active materials that store charge in a device. Previous studies have demonstrated that the addition of IL into PEO results in a decrease in the polymer crystallinity, 27,38 which can be expected to impact the polymer mechanical properties, even though this has not yet been fully explored. Although it has been shown that an applied stress can result in irreversible changes that increase ionic conductivity in PEO/LiI, 39,40 the origins of such changes during loading have not been studied.…”

The effects of SiO 2 and TiO 2 nanofillers on structural and electrochemical properties of poly(ethylene oxide)–EMIHSO 4 electrolytes

“…was added to the PEO mixtureand stirred for 7-8 hr, and the resulting precursor solution was cast on a glass petri dish. The mixture was heated from 50 ° to 80 °C and remained at 80 °Cfor 8-10 hrand then dried under vacuum [8,9]. The PEO-EMIHSO 4 composition, reported as a weight ratio of polymer to IL, was held at 1:3 for all experiments.…”

“…They can also be incorporated into polymer electrolytes to act as ionic conductors and plasticizers [5][6][7]. Previously, we reported on polymer electrolytes consisting of PEO and a non-fluorinated room temperature IL, 1-ethyl-3-methylimidazolium hydrogensulfate (EMIHSO 4 ), and investigated their suitability for electrochemical double-layer A C C E P T E D M A N U S C R I P T capacitors [8].Integration of EMIHSO 4 into the PEO network promoted the amorphous phase, resulting in promising conductivity and stability at room temperature [9]. Nevertheless, further improvement in ionic conductivity and a reduction in crystallinity are necessary to achieve satisfactory performance of PEO-EMIHSO 4 electrolytes for electrochemical energy storage.…”

EMIHSO4-Based Polymer Electrolytes and Their Applications in Solid Electrochemical Capacitors

“…Although the high thermal and electrochemical stability of ILs makes them attractive for applications as electrolytes, most of the high performance ILs are still fluorinated, rendering them less favorable from an environmental standpoint. In a previous work, PEO-based electrolytes containing an environmentally benign non-fluorinated IL, 1-ethyl-3-methylimidazolium hydrogensulfate, were studied for electrochemical capacitors (ECs) (1). The polymer electrolyte exhibited promising high-rate performance which outperformed the liquid counterpart.…”