Study of segmental dynamics and ion transport in polymer–ceramic composite electrolytes by quasi-elastic neutron scattering
| Autor: | Naresh C. Osti, Yangyang Wang, Max J. Palmer, Robert L. Sacci, X. Chelsea Chen, Madhusudan Tyagi, Nancy J. Dudney |
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| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Materials science Process Chemistry and Technology Composite number Biomedical Engineering Energy Engineering and Power Technology chemistry.chemical_element Polymer Electrolyte Neutron scattering Industrial and Manufacturing Engineering chemistry Chemical engineering Chemistry (miscellaneous) visual_art Phase (matter) Materials Chemistry visual_art.visual_art_medium Chemical Engineering (miscellaneous) Ionic conductivity Lithium Ceramic |
| Zdroj: | Molecular Systems Design & Engineering. 4:379-385 |
| ISSN: | 2058-9689 |
| Popis: | Composite electrolytes composed of a polymer electrolyte and an ion-conducting ceramic 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 to the 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. |
| Databáze: | OpenAIRE |
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