Nanomaterials for Garnet Based Solid State Energy Storage

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dc.contributor.advisorHu, Liangbingen_US
dc.contributor.authorDai, Jiaqien_US
dc.contributor.departmentMaterial Science and Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2018-07-17T06:00:29Z
dc.date.available2018-07-17T06:00:29Z
dc.date.issued2018en_US
dc.description.abstractSolid state energy storage devices with solid state electrolytes (SSEs) can potentially address Li dendrite-dominated issues, enabling the application of metallic lithium anodes to achieve high energy density with improved safety. In the past several decades, many outstanding SSE materials (including conductive oxides, phosphates, hydrides, halides, sulfides, and polymer-based composites) have been developed for solid-state batteries. Among various SSEs, garnet-type Li7La3Zr2O12 (LLZO) is one of the most important and appealing candidates for its high ionic conductivity (10-4~10-3 S/cm) at room temperature, wide voltage window (0.0-6.0V), and exceptional chemical stability against Li metal. However, its applications in current solid state energy storage devices are still facing various critical challenges. Therefore, in this quadripartite thesis I focus on developing nanomaterials and corresponding processing techniques to improve the comprehensive performance of solid state batteries from the perspectives of electrolyte design, interface engineering, cathode improvement, and full cell construction. The first part of the thesis provides two novel designs of garnet-based SSE with outstanding performance enabled by engineered nanostructures: a 3D garnet nanofiber network and a multi-level aligned garnet nanostructure. The second part of the thesis focuses on negating the anode|electrolyte interfacial impedance. It consists of several processing techniques and a comprehensive understanding, through systematic experimental analysis, of the governing factors for the interfacial impedance in solid state batteries using metallic anodes. The third part of the thesis reports several processing techniques that can raise the working voltage of Li2FeMn3O8 (LFMO) cathodes and enable the self-formation of a core-shell structure on the cathode to achieve higher ionic conductivity and better electrochemical stability. The development and characterization of a solid state energy storage device with a battery-capacitor hybrid design is included in the last part of the thesis.en_US
dc.identifierhttps://doi.org/10.13016/M2HT2GF7B
dc.identifier.urihttp://hdl.handle.net/1903/20900
dc.language.isoenen_US
dc.subject.pqcontrolledMaterials Scienceen_US
dc.subject.pqcontrolledEnergyen_US
dc.subject.pqcontrolledEngineeringen_US
dc.subject.pquncontrolledBatteriesen_US
dc.subject.pquncontrolledEnergy Storageen_US
dc.subject.pquncontrolledInterface Engineeringen_US
dc.subject.pquncontrolledNanomaterialsen_US
dc.subject.pquncontrolledSolid Stateen_US
dc.subject.pquncontrolledStructure Designen_US
dc.titleNanomaterials for Garnet Based Solid State Energy Storageen_US
dc.typeDissertationen_US

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