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  • Orädd, Greger, et al. (author)
  • Diffusion and dielectric studies of the system PPO4000–NH4CF3SO3
  • 1999
  • In: International Conference(12th) on Solid State Ionics Held in Kassandra, Halkidiki Thessaloniki, Greece on June 6-12, 1999. ; 136-7, s. 457-61
  • Conference paper (peer-reviewed)abstract
    • A polymer electrolyte system composed of poly(propylene oxide) of molecular weight 4000 (PPO4000) complexed with NH4CF3SO3 (NH4TF) has been investigated by multinuclear pfg-NMR and AC impedance methods. Samples in the concentration range 0.03–0.69 mol/kg (O:NH4 ratios of 500:1–22:1) have been investigated over the temperature range 25–75°C. The combination of AC conductance and pfg-NMR diffusion measurements gives clear evidence that extensive ion-aggregation/clustering occurs at low salt concentrations. With increasing salt-content the Haven ratio, defined as Λcalc/Λexp, decreases from >100 to 2 when going from 0.03 to 0.69 mol/kg. Such gross deviations from the Nernst–Einstein relation (i.e. Λ ∝ D++D−) originate in extensively correlated motions of ions. We interpret the results in terms of labile salt-rich sub-domains being further destabilized through an increase in the dielectric constant of the solution with increasing salt content.
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Type of publication
conference paper (1)
Type of content
peer-reviewed (1)
Author/Editor
Orädd, Greger (1)
Ferry, Anders (1)
Furlani, M (1)
University
Umeå University (1)
Language
English (1)
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