{"632994":{"#nid":"632994","#data":{"type":"event","title":"PhD Defense by Ah-Young Song","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETHE SCHOOL OF MATERIALS SCIENCE AND ENGINEERING\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EGEORGIA INSTITUTE OF TECHNOLOGY\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EUnder the provisions of the regulations for the degree\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cbr \/\u003E\r\n\u003Cstrong\u003EDOCTOR OF PHILOSOPHY\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cbr \/\u003E\r\n\u003Cstrong\u003Eon Tuesday, March 10, 2020\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E4:00 PM\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cstrong\u003Ein Love 109\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003Ewill be held the\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EDISSERTATION DEFENSE\u003C\/strong\u003E\u003Cbr \/\u003E\r\n\u003Cbr \/\u003E\r\n\u003Cstrong\u003Efor\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAh-Young Song\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026quot;Understanding Lithium Ion Dynamics in Lithium Hydroxide Chloride and Related Solid Electrolytes\u0026quot;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee Members:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Gleb Yushin, Advisor, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Angus Wilkinson, CHEM\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Johannes Leisen, CHEM\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Josh Kacher, MSE\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EProf. Matthew McDowell, MSE\/ME\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ESolid state electrolytes (SSEs) promise to greatly enhance properties attainable in the next generation rechargeable Li or Li-ion batteries (LIBs) for a wide range of applications from portable electronic equipment to battery-powered electric vehicles (EVs) because many SSEs are non-flammable, less toxic, more stable in higher thermal environments, and potentially more compatible with high capacity Li or Li alloy anodes and high-voltage cathodes. Most battery applications would benefit greatly from high power-to-weight ratio, low cost, and affordable large-scale production of solid state LIBs.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003ELi-rich antiperovskite (LiRAP) has emerged as a promising SSE due to low-cost and broad availability of starting materials, LiRAP low density (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 produced due to a difficulty in identifying lithium and hydrogen by using\u0026nbsp; conventional tools. To demonstrate the impact of proton on total and Li-ion conductivities, I used two complementary approaches: (1) investigating the change in ionic conductivity of Li2OHCl with controlled amount of H replaced by Li in the material, and (2) probing Li+ and H+ dynamics at different temperatures through solid-state nuclear magnetic resonance (NMR) spectroscopy.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EReducing amount of hydrogen was found to decrease Li ionic conductivity, which suggested that the hydrogen assists Li+ hopping. A rotation of a short OH-group opens lower-energy pathways for Li+ jumps, such a Li+ conduction mechanism was confirmed by magic-angle spinning (MAS) 7Li NMR, static 7Li and 1H NMR and spin-lattice T1(7Li)\/T1(1H) relaxation experiments. By measuring both proton and lithium at various temperatures, I have unambiguously determined that protons (H+) do not contribute to long-range diffusion and H+ dynamics is constrained to mostly rotation in the absence of water. Instead, the rearrangement of the OH group controls Li+ and H+ ion dynamics.\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003EI 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 Li and Li-ion batteries.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Understanding Lithium Ion Dynamics in Lithium Hydroxide Chloride and Related Solid Electrolytes"}],"uid":"27707","created_gmt":"2020-02-26 18:32:06","changed_gmt":"2020-02-26 18:32:06","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2020-03-10T17:00:00-04:00","event_time_end":"2020-03-10T19:00:00-04:00","event_time_end_last":"2020-03-10T19:00:00-04:00","gmt_time_start":"2020-03-10 21:00:00","gmt_time_end":"2020-03-10 23:00:00","gmt_time_end_last":"2020-03-10 23:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"174045","name":"Graduate students"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}