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@PHDTHESIS{Gross:1013309,
      author       = {Gross, Jürgen Peter},
      othercontributors = {Schwaiger, Ruth and Gonzalez-Julian, Jesus},
      title        = {"{M}ikrostrukturelle und mechanische {E}igenschaften
                      gegossener {LATP}- und {LATP}/{LFP}-{F}olien"},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {RWTH Aachen University},
      reportid     = {RWTH-2025-05443},
      pages        = {1 Online-Ressource : Illustrationen},
      year         = {2024},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University 2025; Dissertation, Rheinisch-Westfälische
                      Technische Hochschule Aachen, 2024},
      abstract     = {In this work, the manufacturing influences on the
                      mechanical and microstructural properties of
                      Li1+xAlxTi2-x(PO4)3 and Li1+xAlxTi2-x(PO4)3/LiFePO4 tapes
                      are investigated. Due to the demanding sample geometries
                      which are typical for the application, new methods were used
                      and evaluated to determine the mechanical properties of the
                      ceramic battery components. The strength of Al2O3 reference
                      samples was determined using both a newly developed
                      ball-on-3-balls test rig and a conventional ring-on-ring
                      test setup. Subsequently, the fracture toughness of the
                      reference material was determined using micropillar
                      splitting, the conventional Vickers indentation fracture
                      test and a new modeling approach. A series of cast
                      Li1+xAlxTi2-x(PO4)3 and Li1+xAlxTi2-x(PO4)3/LiFePO4 tapes
                      were examined. As part of the investigations on
                      Li1+xAlxTi2-x(PO4) tapes, the starting powders used, the
                      sintering temperatures and the amount of sintering additives
                      used were varied and the influence of the manufacturing
                      parameters on the relative density, phase purity, microcrack
                      formation and grain growth was characterized. In addition,
                      the influences on the elastic deformation behavior, the
                      fracture toughness and the fracture strength of the
                      materials were investigated. To improve the mechanical
                      integrity of the tapes, the relative density must be
                      increased and the formation of microcracks inhibited. The
                      relative density is maximized at a certain sintering
                      temperature. Further densification of the material can be
                      achieved using sintering additives. The formation of
                      microcracks depends on the grain size and the sintering
                      temperature. If a small amount of additive is added, grain
                      growth increases and more cracking occurs. If a large amount
                      of sintering additive is added, both grain growth and the
                      necessary sintering temperature are reduced. Due to the
                      lower sintering temperatures and the increased lithium
                      content of the samples with high amounts of added sintering
                      additive, an orthorhombic Li1+xAlxTi2-x(PO4) modification is
                      formed, which exhibits low ionic conductivity. Reducing the
                      particle size of the starting powder is a promising approach
                      for optimizing the production of Li1+xAlxTi2-x(PO4) tapes,
                      since it could improve the relative density and inhibits
                      microcracking as well as the formation of or thorhombic
                      Li1+xAlxTi2-x(PO4).},
      cin          = {527110 / 520000},
      ddc          = {620},
      cid          = {$I:(DE-82)527110_20191118$ / $I:(DE-82)520000_20140620$},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2025-05443},
      url          = {https://publications.rwth-aachen.de/record/1013309},
}