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@PHDTHESIS{Reppert:848095,
      author       = {Reppert, Thorsten},
      title        = {{H}erstellung und {C}harakterisierung von
                      {L}ithiumlanthanzirkonat-{F}unktionsschichten für
                      {L}ithium-{F}estkörperbatterien},
      volume       = {425},
      school       = {Universität Bochum},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek Verlag},
      reportid     = {FZJ-2018-03374},
      isbn         = {978-3-95806-331-0},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {vii, 187 S.},
      year         = {2018},
      note         = {Universität Bochum, Diss., 2017},
      abstract     = {The 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.},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/848095},
}