Study of segmental dynamics and ion transport in polymer–ceramic composite electrolytes by quasi-elastic neutron scattering
Abstract
Composite electrolytes composed of a polymer electrolyte and an ion-conducting ceramic electrolyte are promising in fulfilling the requirements for a stable lithium metal anode. In this work, we identify the effects of the surface of a lithium-ion-conducting ceramic, the Ohara LICGC™ ceramic, on the segmental dynamics and ionic conductivity of polymer electrolyte consisting of poly(ethylene oxide) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). Using quasi-elastic neutron scattering, we study the segmental motion of PEO chains under the confinement of LiTFSI salt and Ohara ceramic, in their melt state (363 K). We compare the relaxation time, τ, and the monomeric friction coefficient, ζ, of four samples: neat PEO, PEO + Ohara ceramic, PEO + LiTFSI and PEO + LiTFSI + Ohara ceramic. In the absence of LiTFSI, Ohara ceramic posed negligible change in the segmental dynamics of PEO. In contrast, with the presence of LiTFSI, Ohara ceramic slowed down the segmental motion of PEO chains by ~60% compared to neat PEO + LiTFSI. The intrinsic ionic conductivity of the polymer phase in the composite decreased by ~30% compared to the neat polymer electrolyte. The underpinnings of these results may be that polymer chains in the vicinity of the ceramic surface are less mobile duemore »
- Authors:
-
[1];
[1];
[1];
[1];
[1];
[1]
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1515678
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Molecular Systems Design & Engineering
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 2; Journal ID: ISSN 2058-9689
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Chen, X. Chelsea, Sacci, Robert L., Osti, Naresh C., Tyagi, Madhusudan, Wang, Yangyang, Palmer, Max J., and Dudney, Nancy J. Study of segmental dynamics and ion transport in polymer–ceramic composite electrolytes by quasi-elastic neutron scattering. United States: N. p., 2019.
Web. doi:10.1039/c8me00113h.
Chen, X. Chelsea, Sacci, Robert L., Osti, Naresh C., Tyagi, Madhusudan, Wang, Yangyang, Palmer, Max J., & Dudney, Nancy J. Study of segmental dynamics and ion transport in polymer–ceramic composite electrolytes by quasi-elastic neutron scattering. United States. https://doi.org/10.1039/c8me00113h
Chen, X. Chelsea, Sacci, Robert L., Osti, Naresh C., Tyagi, Madhusudan, Wang, Yangyang, Palmer, Max J., and Dudney, Nancy J. Tue .
"Study of segmental dynamics and ion transport in polymer–ceramic composite electrolytes by quasi-elastic neutron scattering". United States. https://doi.org/10.1039/c8me00113h. https://www.osti.gov/servlets/purl/1515678.
@article{osti_1515678,
title = {Study of segmental dynamics and ion transport in polymer–ceramic composite electrolytes by quasi-elastic neutron scattering},
author = {Chen, X. Chelsea and Sacci, Robert L. and Osti, Naresh C. and Tyagi, Madhusudan and Wang, Yangyang and Palmer, Max J. and Dudney, Nancy J.},
abstractNote = {Composite electrolytes composed of a polymer electrolyte and an ion-conducting ceramic electrolyte are promising in fulfilling the requirements for a stable lithium metal anode. In this work, we identify the effects of the surface of a lithium-ion-conducting ceramic, the Ohara LICGC™ ceramic, on the segmental dynamics and ionic conductivity of polymer electrolyte consisting of poly(ethylene oxide) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). Using quasi-elastic neutron scattering, we study the segmental motion of PEO chains under the confinement of LiTFSI salt and Ohara ceramic, in their melt state (363 K). We compare the relaxation time, τ, and the monomeric friction coefficient, ζ, of four samples: neat PEO, PEO + Ohara ceramic, PEO + LiTFSI and PEO + LiTFSI + Ohara ceramic. In the absence of LiTFSI, Ohara ceramic posed negligible change in the segmental dynamics of PEO. In contrast, with the presence of LiTFSI, Ohara ceramic slowed down the segmental motion of PEO chains by ~60% compared to neat PEO + LiTFSI. The intrinsic ionic conductivity of the polymer phase in the composite decreased by ~30% compared to the neat polymer electrolyte. The underpinnings of these results may be that polymer chains in the vicinity of the ceramic surface are less mobile due to coordination with surface bound lithium ions.},
doi = {10.1039/c8me00113h},
journal = {Molecular Systems Design & Engineering},
number = 2,
volume = 4,
place = {United States},
year = {Tue Mar 26 00:00:00 EDT 2019},
month = {Tue Mar 26 00:00:00 EDT 2019}
}
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