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Title: Nuclear magnetic resonance investigation of dynamics in poly(ethylene oxide)-based lithium polyether-ester-sulfonate ionomers

Journal Article · · Journal of Chemical Physics
DOI: https://doi.org/10.1063/1.3669449 · OSTI ID:1076446
 [1];  [1];  [1];  [2]
  1. Pennsylvania State University, University Park, PA (United States)
  2. Pacific Northwest Lab., Richland, WA (United States). Environmental Molecular Sciences Lab.

Nuclear magnetic resonance (NMR) spectroscopy has been utilized to investigate the dynamics of poly(ethylene oxide)-based lithium sulfonate ionomer samples that have low glass transition temperatures. 1H and 7Li spin-lattice relaxation times (T1) of the bulk polymer and lithium ions, respectively, were measured and analyzed in samples with a range of ion contents. The temperature dependence of T1 values along with the presence of minima in T1 as a function of temperature enabled correlation times and activation energies to be obtained for both the segmental motion of the polymer backbone and the hopping motion of lithium cations. Similar activation energies for motion of both the polymer and lithium ions in the samples with lower ion content indicate that the polymer segmental motion and lithium ion hopping motion are correlated in these samples, even though their respective correlation times differ significantly. A divergent trend is observed for correlation times and activation energies of the highest ion content sample with 100% lithium sulfonation due to the presence of ionic aggregation. Details of the polymer and cation dynamics on the nanosecond timescale are discussed and complement the findings of X-ray scattering and Quasi Elastic Neutron Scattering experiments.

Research Organization:
Pennsylvania State University, University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-07ER46409
OSTI ID:
1076446
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 1 Vol. 136; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Correlating the NMR self-diffusion and relaxation measurements with ionic conductivity in polymer electrolytes composed of cross-linked poly(ethylene oxide-propylene oxide) doped with LiN(SO2CF3)2 journal September 2000
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Molecular mobility and Li+ conduction in polyester copolymer ionomers based on poly(ethylene oxide) journal February 2009
Nuclear magnetic relaxation study of poly(ethylene oxide)–lithium salt based electrolytes journal June 1993
Dynamics of sodium ions in NaClO4 complexed in poly(propylene-oxide): A 23Na nuclear magnetic resonance study journal February 1998
Relaxation Effects in Nuclear Magnetic Resonance Absorption journal April 1948
Cation dynamics and relaxation in nanoscale polymer electrolytes: A 7 Li NMR study journal September 1999
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Differences between polymer/salt and single ion conductor solid polymer electrolytes journal January 2013