Mixed glass former effect in borate and thioborate sodium-ion conducting glass systems

dc.contributor.advisor Steve W. Martin
dc.contributor.author Curtis, Brittany
dc.contributor.department Materials Science and Engineering
dc.date 2018-08-11T12:49:23.000
dc.date.accessioned 2020-06-30T03:10:24Z
dc.date.available 2020-06-30T03:10:24Z
dc.date.copyright Tue May 01 00:00:00 UTC 2018
dc.date.embargo 2001-01-01
dc.date.issued 2018-01-01
dc.description.abstract <p>As alternative energy sources continue to increase their production, there becomes a higher demand for cost-effective, safe, and energy efficient grid storage. Solid-state batteries are becoming of increased attention due to the demands for grid storage of alternative energy production, especially on days when these sources are under producing. As these solid-state batteries are being developed, many aspects of these batteries are being researched to optimize safety, cost-effectiveness and energy density. Current lithium-ion batteries have been scrutinized due to their safety concerns utilizing a flammable, liquid electrolyte. These concerns may be limited by replacing these organic, liquid electrolytes with an inorganic solid-state electrolyte. Of particular interest are glassy electrolytes. Glassy solid-state electrolytes prove to be an advantageous competitor due to the relatively low manufacturing costs and increased safety. In addition, properties of these electrolytes (i.e ionic conductivity, density, glass transition temperature, etc.) can be modified due to the mixed glass former effect (MGFE) which occurs when varying the ratio of glass formers from one binary system to the other through a ternary system. Physical and electrochemical properties vary in a non-linear, non-additive trend as the composition, and subsequently the structure, is changed. The structure and physical properties of three glass systems, 0.2Na2O + 0.8[xBO3/2 + (1-x)GeO2], 0.6Na2S + 0.4[xBS3/2 + (1-x)GeS2], and 0.6Na2S + 0.4[xBS3/2 + (1-x)SiS2], have been examined in an attempt to understand the MGFE. By examining an oxide and a sulfide system, it will be seen how substituting one anion for another affects the structure and the physical properties of these glassy solid-state electrolytes. The glass structure was examined through Raman, infrared and NMR spectroscopies. Glass transition temperature was obtained through differential scanning calorimetry. Ionic conductivities were obtained using impedance spectroscopy. Densities were obtained using the Archimedes method.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/16337/
dc.identifier.articleid 7344
dc.identifier.contextkey 12318557
dc.identifier.doi https://doi.org/10.31274/etd-180810-5967
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/16337
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/30520
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/16337/Curtis_iastate_0097E_17341.pdf|||Fri Jan 14 20:58:39 UTC 2022
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Mechanics of Materials
dc.title Mixed glass former effect in borate and thioborate sodium-ion conducting glass systems
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
thesis.degree.discipline Materials Science and Engineering
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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