Journal
MACROMOLECULES
Volume 53, Issue 7, Pages 2406-2411Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.0c00091
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Funding
- Bosch Energy Research Network grant
- National Institute of Standards and Technology [DMR-1508249]
- National Science Foundation [DMR-1508249]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Science Foundation Graduate Student Research Fellowship [DGE-1106400]
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We investigate the segmental dynamics and ion transport in two chemically distinct polymer electrolytes, poly(2-cyanoethyl acrylate) (PCEA) and poly(ethylene oxide) (PEO), and their mixtures with lithium bis(trifluoromethane)sulfonimide (LiTFSI) salt. Quasi-elastic neutron scattering experiments reveal slow dynamics in PCEA/LiTFSI relative to that in PEO/LiTFSI, translating to monomeric friction coefficients that are orders of magnitude different. In spite of the enhanced salt dissociation in PCEA due to the presence of polar groups, ion transport is largely dominated by the effect of increased monomeric friction in the pure polymer. Conductivity in these systems is quantified through a simple expression combining salt dissociation, the monomeric friction in the pure polymer, and the effect of added salt on the monomeric friction.
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