Raman study of triblock polyether/LiCF₃SO₃ polymeric electrolytes

Abstract

A micro-Raman study of triblock polyether/LiCF 3 SO 3 polymeric electrolytes was carried out over a wide range of salt concentrations at room temperature. The different associated species were evidenced by means of a lineshape analysis of the bands related to the symmetric stretching mode n 1 of the SO 3 − termination and to the C-S vibration of the CF 3 SO 3 − anion. The Raman results reveal that the appearance of new associated species coincides with the saturation of prior species.

Hydrogen Bonding Dependent Mesoscale Framework in Crystalline Ln(H2O)9(CF3SO3)3

“…Owing to the smaller ionic electronegativity (EN) of La 3+ than that of H, , the v (C–S) vibration band shifts toward lower wavenumbers with the linkage between hydrated La 3+ and CF 3 SO 3 – . The rocking vibration of SO 3 at ∼354 cm –1 remains nearly unchanged, , indicating the unchanged symmetry of SO 3 . In such a case, the ratio between the relative intensity of v (C–S) and ρ r (SO 3 ) remains identical.…”

The effects of salt concentration on cation complexation in triblock-polyether electrolyte

“…However the ranges of composition were different and no results of thermal and electrical behaviours were presented in that work. In our previous work, 26 the different associated species were evidenced by means of a lineshape analysis of the bands related to the symmetric stretching mode n 1 of the SO 3 À termination and to the C-S vibration of the CF 3 SO 3 À anion. The Raman results revealed that the appearance of new associated species coincides with the saturation of prior species, showing the evolution from small to large associated ionic species with increasing salt concentration.…”

“…Variations in the vibrational frequencies and the Raman spectral linewidth can provide information about the changes in the anion environment. In our previous work, 26 we reported a Raman study of the triblock/LiCF 3 SO 3 system at room temperature. The electrolyte materials studied by Raman spectroscopy in that work were the same as the ones investigated here.…”

“…For more details about the attributions and calculations that allowed the construction of this overall view of the association with salt concentration increase, see ref. 26. For ease of analysis, the presence of 10% of larger aggregates with a Raman line at 1056 cm À1 observed only for O : Li ¼ 3 (ref.…”

“…For ease of analysis, the presence of 10% of larger aggregates with a Raman line at 1056 cm À1 observed only for O : Li ¼ 3 (ref. 26) was omitted in Fig. 4.…”