2019
DOI: 10.1002/mrc.4852
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Nuclear magnetic relaxation and diffusion study of the ionic liquids 1‐ethyl‐ and 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide confined in porous glass

Abstract: The molecular dynamics of the room-temperature ionic liquid 1-butyl-3methylimidazolium bis(trifluoromethylsulfonyl)imide (Bmim Tf2N) confined in porous glass is studied by nuclear magnetic resonance (NMR) relaxometry and diffusometry and is compared with the bulk dynamics over a wide temperature range. The molecular reorientation processes for anions and cations alike are found to be significantly affected by the presence of the glass interface at high temperatures. In this respect, the ionic liquid behaves si… Show more

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Cited by 31 publications
(27 citation statements)
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“…As shown for hydrogen and fluorine, the molecular dynamics becomes more complex when the IL is confined into a silica matrix (IG), but again, it can be treated by assuming the existence of two fractions of the liquid. The same assumption could be made in the case of Li + in the IG, and the total spin–lattice relaxation rate for IGs will be again given by where R 1bulk and R 1RMTD ,, have the following expressions …”
Section: Theorymentioning
confidence: 99%
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“…As shown for hydrogen and fluorine, the molecular dynamics becomes more complex when the IL is confined into a silica matrix (IG), but again, it can be treated by assuming the existence of two fractions of the liquid. The same assumption could be made in the case of Li + in the IG, and the total spin–lattice relaxation rate for IGs will be again given by where R 1bulk and R 1RMTD ,, have the following expressions …”
Section: Theorymentioning
confidence: 99%
“…Solid-state electrolytes have been explored increasingly for use in Li + batteries because of their ability to address the safety issues, packaging constraints, and volumetric design concerns associated with liquid electrolytes. However, solid electrolytes typically exhibit resistive interfaces and an overall low ionic conductivity. Recently, ionogels (IGs), pseudo-solid-state electrolytes consisting of an IL electrolyte confined in a mesoporous inorganic matrix, have attracted interest because of their high ionic conductivity, stability, and solution processability, which ensures a well-wetted electrode/electrolyte interface. Macroscopically, the IG behaves as a solid, but at the nanoscale, a liquid-state is maintained. Structural and dynamical properties of these confined ILs have been investigated using diverse experimental techniques such as quasi-elastic neutron scattering (QENS), solid-state magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, pulsed field gradient (PFG) NMR method, Raman spectroscopy, impedance spectroscopy, and fast field-cycling NMR (FFC-NMR) relaxometry. , Because of the complexity of the trapped liquid, these techniques are yet to fully address the nature of the ion interaction and movement. Understanding how the ions behave inside the matrix is paramount for increasing the ionic conductivity and the Li + transference number.…”
Section: Introductionmentioning
confidence: 99%
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“…The second question concerns diffusion paths, especially the dimensionality of the diffusion process. For ionic liquids in bulk, the translation diffusion is isotropic (three-dimensional) [6][7][8][9][10][11], but for ionic liquids in confinement (e.g., ionogels), one can expect geometrical restrictions that reduce the dimensionality of the motion [12,13].…”
Section: Introductionmentioning
confidence: 99%
“…The underlying principle of NMR diffusometry is monitoring changes in the resonance frequency of NMR active nuclei (such as 1 H or 19 F) associated with different values of the magnetic field experienced by the nuclei as a result of the diffusion of the ions. This method provides self-diffusion coefficients in contrast to NMR relaxometry that probes relative cation-cation, cation-anion, and anion-anion translation movement [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. NMR relaxometry refers to magnetic field (and, hence, resonance frequency) dependent spin-lattice relaxation experiments, typically carried out in the frequency range from about 10 to 40 MHz (for 1 H) [ 20 , 21 ].…”
Section: Introductionmentioning
confidence: 99%