Schmidt, Florian published the artcileSolvate Cation Migration and Ion Correlations in Solvate Ionic Liquids, Computed Properties of 143-24-8, the main research area is solvate cation migration lithium tetrafluoroborate bistrifluoromethanesulfonylimide ionic liquid tetraglyme; electrophoretic NMR solvate cation migration lithium ionic liquid tetraglyme.
Lithium salt-glyme mixtures are interesting candidates as electrolytes for battery applications. Depending on the type of glyme or anion and the salt concentration, they either show ionic liquid-like behavior with stable lithium-glyme complex cations or concentrated salt solution-like behavior. Here, we apply electrophoretic NMR (eNMR) to elucidate transport mechanisms by observing the migration of the mol. species in an elec. field. We investigate two solvate ionic liquids, i.e., lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) and lithium tetrafluoroborate (LiBF4), in tetraglyme (G4) at different glyme-salt molar ratios X. A field-induced migration of neutral glyme mols. is directly observed, which is due to stable solvate-Li complex formation. Transference numbers, effective charges, and ionicities are derived from electrophoretic mobilities and self-diffusion coefficients, resp., for the nuclei 1H, 7Li, and 19F. The effective charges are the highest at the equimolar mixture, X = 1, they differ strongly for lithium and anion, and they show large differences between both systems. These findings are qual. interpreted in a speciation model, suggesting anionic clusters and solvate cations as the species dominating charge transport. The resulting effective charges can only be explained taking into account ion-ion anti-correlations in the framework of the Onsager formalism, where anti-correlations between the solvate cation and the anionic complexes arise due to momentum conservation. The contributions to the anti-correlation are most dominant at high salt concentrations and in the system with the LiBF4- anion due to its lower mass and ability to form larger asym. clusters with Li+. Thus, in either system, also the lithium transference number is influenced to a different extent by ion-ion anti-correlations.
Journal of Physical Chemistry B published new progress about Bond (ionicity). 143-24-8 belongs to class ethers-buliding-blocks, name is 2,5,8,11,14-Pentaoxapentadecane, and the molecular formula is C10H22O5, Computed Properties of 143-24-8.
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem