Ionic Liquid‐Polymer Gel Electrolytes

Abstract

New rubbery gel electrolytes have been prepared from room temperature ionic liquids and poly(vinylidene fluoride)-hexafluoropropylene copolymer [PVdF(HFP)]. The ionic liquids employed in these preparations were 1-ethyl-3-methylimidazolium salts of triflate (CF 3 SO3) and BF4. When properly processed, the ionic liquid-PVdF(HFP) gels are freestanding, flexible films with room temperature conductivities ranging from 1.1 to 5.8 mS cm-'. Because both the ionic liquids and the PVdF(HFP) are nonvolatile and are thermally stable, the gels can be operated at elevated temperatures without performance degradation. An ionic conductivity of 41 mS cm ' was measured for a triflate ionic liquid-PVdF(HFP) gel at 205°C.

Potentialities of ionic liquids as new electrolyte media in advanced electrochemical devices

“…Highly ion-conducting rubbery gel electrolytes from nonchloroaluminate ILs and poly-(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) have been reported by Carlin and coworkers [2]. Stable solid gel electrolytes and membranes can be formed by the addition of PVdF-HFP to 1,3-dialkylimidazolium ILs.…”

“…There are three methods to obtain an ILs-based polymer electrolyte: the first is the incorporation of IL in a polymer matrix [2]; the second is the polymerization of a vinyl monomer in ILs as a solvent [34]; in the third case, the cation or the anion structure is fixed in the polymer segments [35,36].…”

“…Ionic liquids (ILs), i.e., molten salts at temperatures approaching room conditions, are of great actual interest for their unique characteristics, which include: (1) a liquid state over a wide temperature range, which opens a series of new applications; (2) nonvolatility, which assures thermal stability and nonflammability; (3) high ion content, which results in high ionic conductivity; and (4) great chemical and electrochemical stability [1][2][3]. The most common ILs are composed of organic ions, which undergo almost unlimited structural variations because of the easy preparation of a large variety of their components.…”

Enhanced proton transport in nanostructured polymer electrolyte/ionic liquid membranes under water-free conditions

“…Excellent ionic conductivity up to the degradation temperature can open great possibilities regarding the high-temperature PEFC application 19,20 . Among various ILs, imidazolium-based ILs are the most widely studied, and poly(vinylidenefluoride-co-hexafluoropropylene) is a commonly used PEM material.…”

Composite Electrolytes for Lithium Batteries: Ionic Liquids in APTES Cross-Linked Polymers

“…A final conductivity experiment was run in which polymer A imbibed with 150% P 13 was compared to commercially available PEO and PVDF(HFP) imbibed with 150% P 13 . 21 Polymer A is more conductive than both commercial polymers at lower temperatures. The lower conductivity in PEO is most likely due to the presence of less conductive crystalline regions 22,23 within the film, while the PVDF(HFP) film has a less flexible matrix with a higher melt transition.…”