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The Eects of Magnetic Field Alignment on Lithium Ion Transport in a Polymer Electrolyte Membrane with Lamellar Morphology

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cris.lastimport.scopus2024-02-12T20:41:54Z
dc.abstract.enThe transport properties of block copolymer-derived polymer electrolyte membranes (PEMs) are sensitive to microstructural disorder originating in the randomly oriented microdomains produced during uncontrolled self-assembly by microphase separation. This microstructural disorder can negatively impact performance due to the presence of conductivity-impeding grain boundaries and the resulting tortuosity of transport pathways. We use magnetic fields to control the orientational order of Li-doped lamellar polyethylene oxide (PEO) microdomains in a liquid crystalline diblock copolymer over large length scales (>3 mm). Microdomain alignment results in an increase in the conductivity of the membrane, but the improvement relative to non-aligned samples is modest, and limited to roughly 50% in the best cases. This limited increase is in stark contrast to the order of magnitude improvement observed for magnetically aligned cylindrical microdomains of PEO. Further, the temperature dependence of the conductivity of lamellar microdomains is seemingly insensitive to the order-disorder phase transition, again in marked contrast to the behavior of cylinder-forming materials. The data are confronted with theoretical predictions of the microstructural model developed by Sax and Ottino. The disparity between the conductivity enhancements obtained by domain alignment of cylindrical and lamellar systems is rationalized in terms of the comparative ease of percola tion due to the intersection of randomly oriented lamellar domains (2D sheets) versus the quasi-1D cylindrical domains. These results have important implications for the development of methods to maximize PEM conductivity in electrochemical devices, including batteries.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorMajewski, Paweł
dc.contributor.authorOsuji, Chinedum O.
dc.contributor.authorGopinadhan, Manesh
dc.date.accessioned2024-01-26T10:11:01Z
dc.date.available2024-01-26T10:11:01Z
dc.date.copyright2019-05-15
dc.date.issued2019
dc.description.accesstimeAT_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number5
dc.description.versionFINAL_PUBLISHED
dc.description.volume11
dc.identifier.doi10.3390/POLYM11050887
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/122153
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofPolymers
dc.relation.pages887
dc.rightsCC-BY
dc.sciencecloudnosend
dc.subject.enblock copolymers
dc.subject.enpolyelectrolyte membrane
dc.subject.enlithium transport
dc.subject.endirected self-assembly
dc.subject.encharge transport
dc.subject.enmagnetic alignment
dc.titleThe Eects of Magnetic Field Alignment on Lithium Ion Transport in a Polymer Electrolyte Membrane with Lamellar Morphology
dc.typeJournalArticle
dspace.entity.typePublication