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Citation
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HERO ID
3860590
Reference Type
Journal Article
Title
Mechanism of ion transport in perfluoropolyether electrolytes with a lithium salt
Author(s)
Timachova, K; Chintapalli, M; Olson, KR; Mecham, SJ; Desimone, JM; Balsara, NP
Year
2017
Is Peer Reviewed?
1
Journal
Soft Matter
ISSN:
1744-683X
Volume
13
Issue
32
Page Numbers
5389-5396
Language
English
PMID
28702622
DOI
10.1039/c7sm00794a
Web of Science Id
WOS:000407769800003
Abstract
Perfluoropolyethers (PFPEs) are polymer electrolytes with fluorinated carbon backbones that have high flash points and have been shown to exhibit moderate conductivities and high cation transference numbers when mixed with lithium salts. Ion transport in four PFPE electrolytes with different endgroups was characterized by differential scanning calorimetry (DSC), ac impedance, and pulsed-field gradient NMR (PFG-NMR) as a function of salt concentration and temperature. In spite of the chemical similarity of the electrolytes, salt diffusion coefficients measured by PFG-NMR and the glass transition temperature measured by DSC appear to be uncorrelated to ionic conductivity measured by ac impedance. We calculate a non-dimensional parameter, β, that depends on the salt diffusion coefficients and ionic conductivity. We also use the Vogel-Tammann-Fulcher relationship to fit the temperature dependence of conductivity. We present a linear relationship between the prefactor in the VTF fit and β; both parameters vary by four orders of magnitude in our experimental window. Our analysis suggests that transport in electrolytes with low dielectric constants (low β) is dictated by ion hopping between clusters.
Tags
PFAS
•
Additional PFAS (formerly XAgency)
Literature Search November 2019
PubMed
Not prioritized for screening
Perfluoropentanesulfonic acid
•
Expanded PFAS SEM (formerly PFAS 430)
Perfluoropentanesulfonate
•
^Per- and Polyfluoroalkyl Substances (PFAS)
PFPeS (2706-91-4)
Literature Search
Pubmed
•
PFPeS
Literature Search
Pubmed
Screening Results
Excluded/Not on Topic
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