Spectroscopic studies on interactions and microstructures in propylene carbonate—LiTFSI electrolytes

Abstract

Interactions between propylene carbonate (PC) and lithium bis(trifluoromethane sulfone imide) [LiTFSI, LiN(CF 3 SO 2 ) 2 ] were studied by Fourier transform (FT) Raman and IR spectroscopy. It was found that PC interacts with the Li + ions and the TFSI − anions through its skeletal oxygen atoms, leading to solventseparated ion pairs and contact ion pairs in the solution by way of the nitrogen atoms on the anion.

A comparative study of coordination between host polymers and Li+ ions in UV-cured gel polymer electrolytes

“…5(b)-(e). This result is in good agreement with the previous studies, in which the pronounced peak at 1408 cm − 1 arises from the ion-dipole interaction between the CH 2 moieties of EC or PC and salt anions [15,16]. TEGDA and HDDA-based polymer films with EC/PC do not give the peak at 1408 cm − 1 originated from the interaction of CH 2 moiety in EC with ClO 4 \ in Fig.…”

Effect of tris(methoxy diethylene glycol) borate on ionic conductivity and electrochemical stability of ethylene carbonate-based electrolyte

“…The new peak is formed in the region of 1408 cm −1 by introducing LiClO 4 into EC solvent, as shown in Fig. 2(a) and (b) [15]. This peak is assigned to the ion-dipole interaction between -CH 2 -CH 2 -of the EC molecule and ClO 4 − anions.…”

Electrochemical and Spectroscopic Analyses of Lithium Ion Conductive Polymers Prepared by the Copolymerization of Ionic Liquid Monomer with Lithium Salt Monomer

“…26 The s (CF 3 ) band of the free TFSI anion appears at 740 cm À1 in Figure 4. For ion pairs and aggregates, this peak shifted to higher frequencies.…”

“…For ion pairs and aggregates, this peak shifted to higher frequencies. [26][27][28] From the measured shift, we can quantify the amount of free ions, ion pairs, and aggregates. The s (CF 3 ) band of poly(C6EIm) occurs at 741 cm À1 , whereas that of solid LiTFSI occurs at 747 cm À1 .…”