Ion-mediated charge transport in ionomeric electrolytes

Keran Lu, Janna K. Maranas, Scott T. Milner

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Ionomers, or single-ion conductors, serve as a model system to study ion transport in polymeric systems. Conductivity is a system property that depends on the net charge transport in the system. The mechanism through which ions are transported can dramatically change the contribution of an ion's self-motion (i.e. diffusion coefficient) to the conductivity of the system. For example, positive and negative ions diffusing as a pair have no net contribution to conductivity. In a coarse-grained molecular dynamics simulation of sodium-neutralized poly(PEO-co-sulfoisophthalate), we show that ion transport is mediated through consecutive coordination with ion pairs and higher order clusters due to the high density of ions. This transport mechanism is highly efficient and shows evidence of cation relaying. We show that larger ion aggregates can serve as ion-conducting paths for positive charges, and demonstrate how a highly ordered ion aggregate network can improve conductivity by enhancing correlated ion transport.

Original languageEnglish (US)
Pages (from-to)3943-3954
Number of pages12
JournalSoft matter
Issue number17
StatePublished - 2016

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics


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