Dynamic patterning in PEO-based single ion conductors for Li Ion batteries

Kokonad Sinha, Wenqin Wang, Karen I. Winey, Janna Kay Maranas

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We use quasi-elastic neutron scattering (QENS) to study polymer dynamics in PEO-based single ion conductors (ionomers) where the anion is covalently bonded to a PEO spacer through a comonomer unit, so that only the cation contributes to conductivity. We compare the effects of changing ion content on the dynamics of the polymer spacer in two ways - by varying the ratio of ionized to nonionized monomer units and by changing the spacer length. In both cases, two dynamic classes of spacer atoms are observed: we associate these classes with bridge atoms located in the midspacer region and anchor atoms located near the ionized comonomer. Because these dynamic classes are associated with different spatial regions on the PEO spacer, we propose that fast [bridge] and slow [anchor] regions are spatially segregated. We use QENS to determine the fraction of bridge and anchor atoms and estimate their ionic compositions. We further combine this with X-ray scattering to assess the degree of ionic phase separation and propose schematics of dynamic patterning in single ion conductors.

Original languageEnglish (US)
Pages (from-to)4354-4362
Number of pages9
JournalMacromolecules
Volume45
Issue number10
DOIs
StatePublished - May 22 2012

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Polyethylene oxides
Ions
Anchors
Atoms
Elastic scattering
Neutron scattering
Polymers
Ionomers
Schematic diagrams
X ray scattering
Phase separation
Anions
Cations
Negative ions
Monomers
Positive ions
Lithium-ion batteries
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Sinha, Kokonad ; Wang, Wenqin ; Winey, Karen I. ; Maranas, Janna Kay. / Dynamic patterning in PEO-based single ion conductors for Li Ion batteries. In: Macromolecules. 2012 ; Vol. 45, No. 10. pp. 4354-4362.
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Dynamic patterning in PEO-based single ion conductors for Li Ion batteries. / Sinha, Kokonad; Wang, Wenqin; Winey, Karen I.; Maranas, Janna Kay.

In: Macromolecules, Vol. 45, No. 10, 22.05.2012, p. 4354-4362.

Research output: Contribution to journalArticle

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AU - Sinha, Kokonad

AU - Wang, Wenqin

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AB - We use quasi-elastic neutron scattering (QENS) to study polymer dynamics in PEO-based single ion conductors (ionomers) where the anion is covalently bonded to a PEO spacer through a comonomer unit, so that only the cation contributes to conductivity. We compare the effects of changing ion content on the dynamics of the polymer spacer in two ways - by varying the ratio of ionized to nonionized monomer units and by changing the spacer length. In both cases, two dynamic classes of spacer atoms are observed: we associate these classes with bridge atoms located in the midspacer region and anchor atoms located near the ionized comonomer. Because these dynamic classes are associated with different spatial regions on the PEO spacer, we propose that fast [bridge] and slow [anchor] regions are spatially segregated. We use QENS to determine the fraction of bridge and anchor atoms and estimate their ionic compositions. We further combine this with X-ray scattering to assess the degree of ionic phase separation and propose schematics of dynamic patterning in single ion conductors.

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