Issue 17, 2016

Ion-mediated charge transport in ionomeric electrolytes

Abstract

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.

Graphical abstract: Ion-mediated charge transport in ionomeric electrolytes

Supplementary files

Article information

Article type
Paper
Submitted
29 Feb 2016
Accepted
14 Mar 2016
First published
18 Mar 2016

Soft Matter, 2016,12, 3943-3954

Ion-mediated charge transport in ionomeric electrolytes

K. Lu, J. K. Maranas and S. T. Milner, Soft Matter, 2016, 12, 3943 DOI: 10.1039/C6SM00524A

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