1 option
Solvent-swollen nanostructured single-ion conducting polymers for enhanced lithium-ion conductivity Benjamin Thomas Ferko
- Format:
- Book
- Thesis/Dissertation
- Author/Creator:
- Ferko, Benjamin Thomas, author.
- Language:
- English
- Subjects (All):
- Plastics.
- Materials science.
- Morphology.
- Nanoscience.
- 0794.
- 0795.
- 0565.
- 0287.
- Local Subjects:
- Plastics.
- Materials science.
- Morphology.
- Nanoscience.
- 0794.
- 0795.
- 0565.
- 0287.
- Genre:
- Academic theses
- Physical Description:
- 1 online resource (274 pages)
- Contained In:
- Dissertations Abstracts International 87-12B
- Place of Publication:
- Ann Arbor : ProQuest Dissertations and Theses, 2026
- Language Note:
- English
- Summary:
- Lithium-ion batteries are a dominant energy storage technology, and improvements to the electrolyte may further enhance energy density and safety. Single-ion conducting polymer electrolytes show improved ion transport and stability, but fail to meet conductivities for use as an alternative to conventional liquid electrolytes. Strong coupling between lithium-ion transport and segmental dynamics in polymer electrolytes with dissolved salt limits the achievable ionic conductivities, while single-ion conducting polymers sequester ionic groups into channels facilitating decoupling and improving ion transport. This thesis explores the incorporation of solvent into single-ion conducting polymers and correlates solvent chemistries, solvent content, and nanoscale morphologies with lithium-ion conductivity.A bulk, isotropic multiblock copolymer having layered nanostructures is selectively-swollen with a polar solvent incorporated primarily in the ion-containing polar sublayers. Ion transport is enhanced through partial coordination of lithium counterions with solvent molecules. Increasing solvent content increases interactions between lithium-ions and solvent molecules which further improves lithium-ion conductivities.Development of environmental chambers for grazing incidence X-ray scattering and broadband dielectric spectroscopy enables characterization of the morphologies, compositions, dielectric relaxations, and ionic conductivities of polymer thin films exposed to controlled water- or solvent-vapor environments. Thin films of nanostructured polymers display solvent- and temperature-dependent morphological changes, and interdigitated electrodes measure the in-plane ionic conductivities when layered nanostructures are oriented parallel to the substrate. Using these methods, thin films of a multiblock copolymer were prepared with layers oriented parallel to the substrate that persist under flowing solvent vapor. The in-plane ionic conductivities improve in the aligned nanostructures with selective-swelling by four solvents. When solvent-swelling is performed in the presence of grain boundaries, solvent uptake is reduced, while ionic conductivities are improved relative to the thin films.Morphological changes in solvent-swollen aperiodic nanostructured aggregates in lithium-neutralized partially sulfonated polystyrene ionomers are captured using Gaussian random field reconstructions. Wider, more interconnected channels correlate with improved lithium-ion conductivities. Importantly, solvent choice impacts ion transport with sulfolane yielding the highest room-temperature ionic conductivity
- Notes:
- Source: Dissertations Abstracts International, Volume: 87-12, Section: B.
- Advisors: Winey, Karen I. Committee members: Frischknecht, Amalie L.; Osuji, Chinedum O.; Stach, Eric A.
- Ph.D. University of Pennsylvania 2026
- Vendor supplied data
- Local Notes:
- School code: 0175
- ISBN:
- 9798247979777
- Access Restriction:
- Restricted for use by site license
The Penn Libraries is committed to describing library materials using current, accurate, and responsible language. If you discover outdated or inaccurate language, please fill out this feedback form to report it and suggest alternative language.