Ion Conductivity in Salt-Doped Polymers: Combined Effects of Temperature and Salt Concentration.

ABSTRACT: We construct a coarse-grained molecular dynamics model based on poly(ethylene oxide) and lithium bis(trifluoromethane)sulfonimide salt to examine the combined effects of temperature and salt concentration on the transport properties. Salt doping notably slows the dynamics of polymer chains and reduces ion diffusivity, resulting in a glass transition temperature increase proportional to the salt concentration. The polymer diffusion is shown to be well represented by a modified Vogel-Fulcher-Tamman (M-VFT) equation that accounts for both the temperature and salt concentration dependence. Furthermore, we find that, at any temperature, the concentration dependence of the conductivity is well described by the product of its infinite dilution value and a correction factor accounting for the redu

SUBMITTER: Tsamopoulos AJ 

PROVIDER: S-EPMC10956493 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature