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dc.contributor.advisorYushin, Gleb
dc.contributor.authorSong, Ah-Young
dc.date.accessioned2022-05-18T19:19:15Z
dc.date.available2022-05-18T19:19:15Z
dc.date.created2020-05
dc.date.issued2020-03-25
dc.date.submittedMay 2020
dc.identifier.urihttp://hdl.handle.net/1853/66399
dc.description.abstractSolid state electrolytes (SSEs) promise to greatly enhance properties attainable in the next generation Li-ion batteries (LIBs) because of non-flammable, less toxic, high thermal stability, and more compatible with electrodes. Li-rich antiperovskite (LiRAP) has emerged as a promising SSE due to low-cost and easy availability of starting materials, light weight and a low melting point for inexpensive and mass production. Unfortunately, there was a lack of clear understanding of the LiRAP chemical composition and its impact on the conductivity. To demonstrate the impact of proton on total and Li-ion conductivities, I used two complementary approaches: (1) investigating the change in the conductivity of Li2OHCl with controlled amount of H in the material, and (2) probing Li+ and H+ dynamics through solid-state nuclear magnetic resonance (NMR) spectroscopy. Reducing amount of proton (H+) was found to decrease the measured conductivity, which suggested that the H+ assists Li+ hopping. A rotation of OH-group opens lower-energy pathways for Li+ jumps, such a Li+ conduction mechanism was confirmed by line shape and spin-lattice T1 relaxation experiments of 7Li and 1H NMR. I have unambiguously determined that H+ are constrained to mostly rotation, which do not contribute to long-range diffusion. Instead, the rotation of the OH group controls Li+ and H+ ion dynamics. I expect the findings reported in my thesis to show new avenues for enhancing Li-ion conductivities in SSEs and contribute to the development of safer and more energy-dense solid-state LIBs.
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technology
dc.subjectSolid electrolyte
dc.subjection dynamic
dc.titleUnderstanding Lithium Ion Dynamics in Lithium Hydroxide Chloride and Related Solid Electrolytes
dc.typeDissertation
dc.description.degreePh.D.
dc.contributor.departmentMaterials Science and Engineering
thesis.degree.levelDoctoral
dc.contributor.committeeMemberWilkinson, Angus
dc.contributor.committeeMemberKacher, Josh
dc.contributor.committeeMemberLeisen, Johannes
dc.contributor.committeeMemberMcDowell, Matthew
dc.date.updated2022-05-18T19:19:15Z


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