Effects of dynamic spatial disorder on ionic transport properties in polymer electrolytes based on poly(propylene glycol)(4000)

摘要: The equivalent ionic dc conductivity (Λ) generally exhibits a dramatic concentration dependence in electrolytic systems based on the host polymer poly(propylene glycol) of molecular weight 4000 (PPG4000). In particular, Λ typically increases rapidly with increasing salt passing through temperature dependent maximum at high concentration. Prompted by recent reports microscopic phase separation occurring these electrolytes, we here report vibrational spectroscopic, conductivity, and restricted diffusion data for ion-conductors PPG4000 complexed lithium salts LiCF3SO3 LiN(CF3SO2)2, an attempt to resolve seemingly contradictory results concerning transport phenomena complexes. We find that differential coefficient Ds, describing bulk motion over long time scales, qualitatively similar as Λ. This is contrary 19F pfg-NMR PPG4000-LiCF3SO3 system whi...