A structural study of LiTFSI-tetraglyme mixtures: From diluted solutions to solvated ionic liquids
Artikel i vetenskaplig tidskrift, 2015

We report on the nano-structure of solvated ionic liquids (SILs) formed by dissolving a Li-salt (LiTFSI) in the solvent tetraglyme. Using small angle X-ray scattering (SAXS), supported by Raman spectroscopy and computational modeling we follow how the nano-structure develops as Li-salt is added to the solvent. We find that, as the Li-salt concentration is increased a peak at Q 0.95 Å- 1 grows in intensity, signaling the presence of structural correlations typical of those found in traditional ionic liquids. The intensity of the peak reaches its maximum at the equimolar concentration, where each Li-ion can be solvated by one solvent molecule forming an effective cation complex. Combining the SAXS data with computer modeling we show that this peak can be assigned to charge alternation, also found in traditional ionic liquids. However, we also show that even at the equimolar concentration not all Li-ions are solvated by the solvent molecules, but a small fraction interacts directly with the anion (TFSI).

Solvated ionic liquids

Ions

SAXS

Ionic liquids

Electrolytes

Molecules

Lithium

X ray scattering

Batteries

Simulation

TFSI

Raman

Electrolyte

Lithium-ion batteries

Solar cells

Solvents

Liquids

Glymes

Nanostructures

Tetraglyme

Författare

Luis Aguilera Medina

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Shizhao Xiong

National University of Defense Technology

Johan Scheers

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Aleksandar Matic

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Journal of Molecular Liquids

0167-7322 (ISSN)

Vol. 210 238-242

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1016/j.molliq.2015.04.053

Mer information

Skapat

2017-10-08