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@ARTICLE{Breuer:280760,
      author       = {Breuer, Stefan and Prutsch, Denise and Ma, Qianli and Epp,
                      Viktor and Preishuber-Pflügl, Florian and Tietz, Frank and
                      Wilkening, Martin},
      title        = {{S}eparating bulk from grain boundary {L}i ion conductivity
                      in the sol–gel prepared solid electrolyte
                      {L}i1.5{A}l0.5{T}i1.5({PO}4)3},
      journal      = {Journal of materials chemistry / A},
      volume       = {3},
      number       = {42},
      issn         = {2050-7496},
      address      = {London {[u.a.]},
      publisher    = {RSC},
      reportid     = {FZJ-2016-00517},
      pages        = {21343 - 21350},
      year         = {2015},
      abstract     = {Lithium aluminium titanium phosphate (LATP) belongs to one
                      of the most promising solid electrolytes. Besides
                      sufficiently high electrochemical stability, its use in
                      lithium-based all-solid-state batteries crucially depends on
                      the ionic transport properties. While many impedance studies
                      can be found in literature that report on overall ion
                      conductivities, a discrimination of bulk and grain boundary
                      electrical responses via conductivity spectroscopy has
                      rarely been reported so far. Here, we took advantage of
                      impedance measurements that were carried out at low
                      temperatures to separate bulk contributions from the grain
                      boundary responses. It turned out that bulk ion conductivity
                      is by at least three orders of magnitude higher than ion
                      transport across the grain boundary regions. At temperatures
                      well below ambient long-range Li ion dynamics is governed by
                      activation energies ranging from 0.26 to 0.29 eV depending
                      on the sintering conditions. As an example, at temperatures
                      as low as 173 K, the bulk ion conductivity, measured in N2
                      inert gas atmosphere, is in the order of 8.1 × 10−6 S
                      cm−1. Extrapolating this value to room temperature yields
                      ca. 3.4 × 10−3 S cm−1 at 293 K. Interestingly, exposing
                      the dense pellets to air atmosphere over a long period of
                      time causes a significant decrease of bulk ion transport.
                      This process can be reversed if the phosphate is calcined at
                      elevated temperatures again.},
      cin          = {IEK-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000363163200061},
      doi          = {10.1039/C5TA06379E},
      url          = {https://juser.fz-juelich.de/record/280760},
}