New ionic liquids from azepane and 3-methylpiperidine exhibiting wide electrochemical windows

Belhocine, Tayeb; Forsyth, Stewart A.; Gunaratne, H. Q. Nimal; Nieuwenhuyzen, Mark; Puga, Alberto V.; Seddon, Kenneth R.; Сринивасан, Г.; Whiston, Keith

doi:10.1039/c0gc00534g

Cited by 42 publications

(38 citation statements)

References 26 publications

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“…As shown in Fig. 4b 31 ) could be expected to further increase the energy density of EDLCs with conductive MOF electrodes that could withstand such working voltages.…”

Section: Capacitance and Energy Density Of Mof-based Supercapacitorsmentioning

confidence: 97%

Molecular understanding of charge storage and charging dynamics in supercapacitors with MOF electrodes and ionic liquid electrolytes

et al. 2020

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We present a 'computational microscopy' analysis (targeted molecular dynamics simulations) of the structure and performance of conductive metal organic framework (MOF) electrodes in supercapacitors with room temperature ionic liquids. The molecular modeling predicts the characteristic shapes of the potential dependence of electrode capacitance, relying on the structure of MOF electrodes and particularly how ions transport and reside in MOFs under polarization. Transmission line model was adopted to characterize the charging dynamics process and build up a bridge to evaluate the capacitive performance of practical supercapacitor devices at macroscale from the simulation-obtained data at nanoscale. Such nanoscale-to-macroscale analysis demonstrates the potential of MOF supercapacitors for achieving unprecedentedly high volumetric energy and power densities. The investigation gives molecular insights into the preferred structures of MOF for achieving these results, which could provide a blueprint for future experimental characterization of these new systems.

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“…As shown in Fig. 4b 31 ) could be expected to further increase the energy density of EDLCs with conductive MOF electrodes that could withstand such working voltages.…”

Section: Capacitance and Energy Density Of Mof-based Supercapacitorsmentioning

confidence: 97%

Molecular understanding of charge storage and charging dynamics in supercapacitors with MOF electrodes and ionic liquid electrolytes

et al. 2020

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“…The conductivity of the AZ14-TFSI is in good agreement with the value reported by Belhocine et al (0.59 mS cm −1 ). 20 It was also found that the conductivity increased as a function of temperature throughout the range from −20…”

Section: Viscosity and Conductivity-mentioning

confidence: 92%

“…Belhocine et al found that AZ14-TFSI has similar potential window of 6.5 V with a slightly different oxidation onset at 6.25 V and different reduction onset at −0.25 V, that is a higher cathodic stability and lower anodic stability compared to our AZ14-TFSI. 20 This could simply be attributed to a shift in potential due to the use of different electrodes and possibly the presence of impurities due to different synthetic methods.…”

Section: Viscosity and Conductivity-mentioning

confidence: 99%

“…During the course of the study, Belhocine et al published their work on similar ionic liquids but with no report of their battery performance. 20,21 Herein, we describe the * Electrochemical Society Active Member. z E-mail: Yaser.Abu-Lebdeh@nrc.gc.ca physical and chemical properties of synthesized azepanium imide salts and compare it with their five and six-membered counterparts and report on their potential use in lithium batteries.…”

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confidence: 99%

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Room Temperature Ionic Liquid Electrolytes Based on Azepanium Imide Salts for Lithium Batteries

Salem

Nicodemou

Abu-Lebdeh

et al. 2011

J. Electrochem. Soc.

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Ionic liquids based on the imide salts of the dialkyl azepanium cation, AZ (R 1 , R 2 ) were synthesized, characterized, and evaluated as electrolytes in lithium batteries. Nine salts were synthesized with variation in the length of the two alkyl groups [R 1 , R 2 = methyl (1), ethyl (2), propyl (3) and butyl (4)]. It was found that the asymmetric ones with R 2 -R 1 ≥ 2 are liquids at ambient temperature. The three room-temperature ionic liquids (AZ13-TFSI, AZ14-TFSI, AZ24-TFSI) showed, in the neat form, ionic conductivities in the range of 0.1-0.6 mS/cm, viscosities of 260-350 cP and an electrochemical window of 5.5-6 V. It was found that mixing the ionic liquids with ethylene carbonate gave electrolytes with lower viscosities, increased conductivities and improved electrochemical cathodic stability. Electrolytes based on the ILs were evaluated in lithium half cells with different chemistries; Li

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“…Along that vein, phosphonium ILs have been observed to have favorable characteristics, including lower costs [2–6], lower viscosity (by ~50%) [7–11], greater thermal stability (by ~100 °C) [10–12], and wider electrochemical windows compared to their ammonium congeners. The family of ILs bearing cyclic cations (pyrrolidinium, piperidinium, and azepanium) [13–14] have been shown to have better transport and physical properties than most acyclic tetraalkylammonium salts. While cyclic phosphonium salts have been noted in patent applications [15], their characteristics have not been reported therein nor in journals, even though the comparisons noted above suggest those properties might be advantageous.…”

Section: Introductionmentioning

confidence: 99%

Cyclic phosphonium ionic liquids

Lall-Ramnarine¹,

Mukhlall²,

Wishart³

et al. 2014

Beilstein J. Org. Chem.

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SummaryIonic liquids (ILs) incorporating cyclic phosphonium cations are a novel category of materials. We report here on the synthesis and characterization of four new cyclic phosphonium bis(trifluoromethylsulfonyl)amide ILs with aliphatic and aromatic pendant groups. In addition to the syntheses of these novel materials, we report on a comparison of their properties with their ammonium congeners. These exemplars are slightly less conductive and have slightly smaller self-diffusion coefficients than their cyclic ammonium congeners.

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New ionic liquids from azepane and 3-methylpiperidine exhibiting wide electrochemical windows

Cited by 42 publications

References 26 publications

Molecular understanding of charge storage and charging dynamics in supercapacitors with MOF electrodes and ionic liquid electrolytes

Molecular understanding of charge storage and charging dynamics in supercapacitors with MOF electrodes and ionic liquid electrolytes

Room Temperature Ionic Liquid Electrolytes Based on Azepanium Imide Salts for Lithium Batteries

Cyclic phosphonium ionic liquids

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