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000848095 020__ $$a978-3-95806-331-0
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000848095 041__ $$aGerman
000848095 1001_ $$0P:(DE-Juel1)159367$$aReppert, Thorsten$$b0$$eCorresponding author$$gmale$$ufzj
000848095 245__ $$aHerstellung und Charakterisierung von Lithiumlanthanzirkonat-Funktionsschichten für Lithium-Festkörperbatterien$$f- 2018-06-15
000848095 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek Verlag$$c2018
000848095 300__ $$avii, 187 S.
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000848095 4900_ $$aSchriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment$$v425
000848095 502__ $$aUniversität Bochum, Diss., 2017$$bDissertation$$cUniversität Bochum$$d2017
000848095 520__ $$aThe aim of this work is to produce a lithium ion conducting solid electrolyte as basic material for application in new efficient energy storage such as solid state batteries. If the liquid electrolyte in lithium ion batteries (LIB) is replaced by a self-supported solid electrolyte, safety, durability and energy density can be improved. Tape casting is a suitable method to process aforementioned self-supported solid electrolytes. The focus is on the powder synthesis of lithium lanthanum zirconate (Li$_{7}$La$_{3}$Zr$_{2}$O$_{12}$;LLZO)which can be optimized by substitution with elements like Al, Ta or Y. These substituted LLZO compositions show improved mechanical and (electro-) chemical stability, and have the highest lithium ion conductivity for all oxide electrolytes. Furthermore, a comparison between the synthesis by solid state reaction and by spray pyrolysis is made. In respect of the influence of process parameters, the microstructure, mechanical properties and the ionic conductivity of sintered pellets are examined. Spray pyrolysis has proved to be a scalable method which was used to synthesize Al-LLZO in a purely cubic phase. Moreover, in this work it is shown that Ta-LLZO has the most suitable cross-section profile in matters of sinterbility, the mechanical properties (hardness and elastic modulus) and lithium ion conductivity. Another main focus is the characterization of LLZO’s crystal structure. Several LLZO electrolytes have been sintered in an air or an argon atmosphere and were subsequently examined by complementary characterization methods in the context of a cooperation with the $\textit{Oak Ridge National Laboratory}$ (ORNL). Next to the crystal structure, especially the atomic positions as well as the occupancies of lithium were determined for several LLZO compositions. A water-free synthesis of LLZO powders was proven by inelastic neutron scattering and in addition, a lithium-proton exchange was prevented. Furthermore, neutron backscattering is used to determine LLZO’s self-diffusion constants and related activation energies. Thus, it could be shown that the tetragonal LLZO phase doesn’t contribute significantly to lithium ion’s self-diffusion. Spray pyrolyzed Al-LLZO was used for a tape casting slurry’s development. A defect-free thin electrolyte film was cast and used for sintering experiments. The microstructure of sintered solid state electrolytes still is not sufficient for a self-supported solid electrolyte. Though, a promising candidate for continuing tape casting is tantalum substituted LLZOsynthesized by spray pyrolysis. Its suitable particle size distribution and sinterbility enable the fabrication of self-supported LLZO functional layer for solid state lithium ion batteries.
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