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@ARTICLE{Neises:909448,
      author       = {Neises, Julian and Scheld, Walter Sebastian and Seok,
                      Ah-Ram and Lobe, Sandra and Finsterbusch, Martin and
                      Uhlenbruck, Sven and Schmechel, Roland and Benson, Niels},
      title        = {{S}tudy of thermal material properties for {T}a- and
                      {A}l-substituted {L}i 7 {L}a 3 {Z}r 2 {O} 12 ({LLZO})
                      solid-state electrolyte in dependency of temperature and
                      grain size},
      journal      = {Journal of materials chemistry / A},
      volume       = {10},
      number       = {22},
      issn         = {2050-7488},
      address      = {London},
      publisher    = {RSC},
      reportid     = {FZJ-2022-03195},
      pages        = {12177 - 12186},
      year         = {2022},
      abstract     = {Solid-state electrolytes such as tantalum (Ta)- and
                      aluminum (Al)-substituted Li7La3Zr2O12 (LLZO) are seen as
                      the key component for the next generation of mainstream
                      battery technology. However, this development often lacks
                      specific information on decisive material parameters.
                      Therefore, this work experimentally investigates the thermal
                      material parameters such as the thermal conductivity (κ)
                      and the specific heat capacity (Cp) of LLZO between room
                      temperature and 1225 K using laser flash analysis (LFA) and
                      differential scanning calorimetry (DSC). The DSC
                      measurements reveal a Cp of 0.55–0.80 J g−1 K−1.
                      Furthermore, a decomposition of the cubic LLZO phase to
                      pyrochlore La2Zr2O7 is detected between 1500 K and 1750 K,
                      which is substantiated by Raman- and SEM-analysis. The
                      impact of the grain size on κ is also considered, as the
                      Al-substitution leads to the formation of significantly
                      larger grain sizes compared to a Ta-substitution. The LFA
                      measurements yield a relatively constant κ between
                      1.45–1.55 W m−1 K−1 for both materials and grain
                      sizes, which is the consequence of a phonon mean free path
                      in the range of the interatomic distance of the LLZO
                      crystal. This implies that phonon scattering at grain
                      boundaries is negligible and the main scattering occurs at
                      inhomogeneities in the crystal lattice.},
      cin          = {IEK-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {1223 - Batteries in Application (POF4-122) /
                      Verbundprojekt: OptiKeraLyt: Material- und
                      Produktionsprozessoptimierung für Lithium-Ionen-Batterien
                      mit keramischen Festkörperelektrolyten; Teilvorhaben:
                      Synthese von keramischen Festkörperkomponenten (03ETE016F)},
      pid          = {G:(DE-HGF)POF4-1223 / G:(BMWi)03ETE016F},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000802322800001},
      doi          = {10.1039/D2TA00323F},
      url          = {https://juser.fz-juelich.de/record/909448},
}