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@ARTICLE{Epp:280761,
      author       = {Epp, Viktor and Ma, Qianli and Hammer, Eva-Maria and Tietz,
                      Frank and Wilkening, Martin},
      title        = {{V}ery fast bulk {L}i ion diffusivity in crystalline
                      {L}i1.5{A}l0.5{T}i1.5({PO}4)3 as seen using {NMR}
                      relaxometry},
      journal      = {Physical chemistry, chemical physics},
      volume       = {17},
      number       = {48},
      issn         = {1463-9084},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {FZJ-2016-00518},
      pages        = {32115 - 32121},
      year         = {2015},
      abstract     = {The realization of large powerful all-solid-state batteries
                      is still hampered by the availability of environmentally
                      friendly and low-cost Li ion conductors that can easily be
                      produced on a large scale and with high reproducibility.
                      Advanced solid electrolytes benefit from fast ion-selective
                      transport and non-flammability, but they may have low
                      electrochemical stability with respect to Li metal.
                      Sol–gel-synthesized lithium titanium aluminum phosphate
                      Li1.5Al0.5Ti1.5(PO4)3 (LATP), which was prepared via a new
                      synthesis route taking advantage of an annealing step at
                      relatively low temperatures, has the potential to become one
                      of the major players in this field although it may suffer
                      from reduction upon direct contact with metallic lithium.
                      Its ion dynamics is, however, as yet poorly understood. In
                      the present study, 7Li nuclear magnetic resonance (NMR)
                      spectroscopy was used to monitor the key Li jump processes
                      on the atomic scale. NMR relaxation clearly reveals
                      heterogeneous dynamics comprising distinct ultra-fast and
                      slower diffusion processes. The high Li ion self-diffusion
                      coefficients deduced originate from a rapid Li exchange with
                      activation energies as low as 0.16 eV which means that
                      sol–gel synthesized LATP is superior to other solid
                      electrolytes. Our NMR results fully support recent
                      theoretical investigations on the underlying diffusion
                      mechanism, indicating that to rapidly jump from site to
                      site, the ions use interstitial sites connected by
                      low-energy barriers in LATP.},
      cin          = {IEK-1 / IEK-12},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / I:(DE-Juel1)IEK-12-20141217},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000365954700004},
      pubmed       = {pmid:26580669},
      doi          = {10.1039/C5CP05337D},
      url          = {https://juser.fz-juelich.de/record/280761},
}