Answers are grounded in this paper and cite their sources.
Polymer electrolytes based on poly(bis(methoxyethoxyethoxy)phosphazene) (MEEP) exhibit some of the highest room temperature ionic conductivities reported in a single-phase system. The mechanism of ionic transport in polymer electrolytes, particularly the nature of the charge-carrying species, has been poorly understood at the molecular level. Vibrational spectroscopy is used to determine the nature and relative amounts of ionic species present in MEEP−LiCF 3 SO 3 as a function of salt concentration. The composition corresponding to the conductivity maximum is completely dominated by neutral cation−anion contact ion pairs and the triple anion species, {Li(CF 3 SO 3 ) 2 } - . Furthermore, the conductivity changes only slightly at higher salt concentrations where triple cations dominate. These data require a dissociation−reassociation mechanism of ion transport in which dynamic equilibrium is established between the various ionically associated species by exchange of individual Li + and CF 3 SO 3 - ions. The individual ions migrate between associated ionic species through the liquidlike domains defined by the entangled ethylene oxide side chains.
No takes yet. Share an insight, caveat, or question.
Frech et al. (2004) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: