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@ARTICLE{Mertens:837604,
      author       = {Mertens, Andreas and Yu, Shicheng and Schön, Nino and
                      Guenduez, Deniz and Tempel, Hermann and Schierholz, Roland
                      and Hausen, Florian and Kungl, Hans and Granwehr, Josef and
                      Eichel, Rüdiger-A.},
      title        = {{S}uperionic bulk conductivity in {L}i 1.3 {A}l 0.3 {T}i
                      1.7 ({PO} 4 ) 3 solid electrolyte},
      journal      = {Solid state ionics},
      volume       = {309},
      issn         = {0167-2738},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2017-06483},
      pages        = {180 - 186},
      year         = {2017},
      abstract     = {Superionic lithium-ion conductors of NASICON structure are
                      promising solid electrolytes for all solid-state batteries.
                      But still further improvement of the ionic conductivity is
                      necessary to be competitive with today's liquid
                      electrolytes. This requires a thorough understanding of
                      grain and grain boundary ion transport properties. However,
                      distinguishing between the impedance contributions of both
                      regimes proved to be difficult before, due to their
                      overlapping time constants, which often necessitate
                      measurements below 0 °C. In contrast, we analyze a
                      Li1.3Al0.3Ti1.7(PO4)3 (LATP) solid electrolyte under battery
                      operation temperatures between 10 °C and 50 °C by
                      impedance measurements in combination with a distribution of
                      relaxation time analysis in two dimensions (2D-DRT). By
                      correlation with microstructural observation in the
                      laser-scanning microscope (LSM), scanning electron
                      microscope (SEM) and atomic force microscope (AFM) the
                      dominating ion transport pathway is determined within a
                      bricklayer model on a macroscopic scale. Moreover, the ionic
                      conductivities of grain and grain boundary are calculated.
                      For the grain, conductivity values of 2 mS cm−1 at room
                      temperature are found. The ion transport activation energies
                      of both domains are determined to be 182 meV and 430 meV,
                      respectively. Optimization routes for further ionic
                      conductivity improvements are derived.},
      cin          = {IEK-9},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-9-20110218},
      pnm          = {131 - Electrochemical Storage (POF3-131) / HITEC -
                      Helmholtz Interdisciplinary Doctoral Training in Energy and
                      Climate Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-131 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000412266100025},
      doi          = {10.1016/j.ssi.2017.07.023},
      url          = {https://juser.fz-juelich.de/record/837604},
}