Cationâanion and cationâpolymer interactions in (PEO)nNaCF3SO3 (n=1â80)
1999; Elsevier BV; Volume: 121; Issue: 1-4 Linguagem: Inglês
10.1016/s0167-2738(98)00534-7
ISSN1872-7689
Autores Tópico(s)Advanced Battery Materials and Technologies
ResumoCation–anion interactions and cation–polymer interactions in the system (PEO)nNaCF3SO3 (1≤n≤80) have been studied using Raman and FTIR spectroscopy. In the dilute salt region (80≥n≥50) there are predominately `free' ions and ion pairs present. However at increasing salt concentration, two aggregate species are observed. The symmetric SO3 stretching mode of one of the aggregate species appears at a frequency which is lower than that of the `free' triflate anion (CF3SO3−), in contrast to behavior seen in the PEO–lithium triflate system. The cation–polymer interactions in high molecular weight PEO–sodium triflate do not appear to involve a local distortion of the –O–C–C–O– torsional angle, consistent with the crystal structure reported for the compound (PEO)NaCF3SO3. However such a distortion does appear to be present in the diglyme–sodium triflate system at salt concentrations n≤20.
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