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@ARTICLE{Bitzer:812031,
      author       = {Bitzer, Martin and Van Gestel, Tim and Uhlenbruck, Sven and
                      Buchkremer, Hans Peter},
      title        = {{S}ol-gel synthesis of thin solid
                      {L}i$_{7}${L}a$_{3}${Z}r$_{2}${O}$_{12}$ electrolyte films
                      for {L}i-ion batteries},
      journal      = {Thin solid films},
      volume       = {615},
      issn         = {0040-6090},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2016-04327},
      pages        = {128–134},
      year         = {2016},
      abstract     = {The application of a solid state electrolyte layer could
                      greatly improve current Li-ion batteries in terms of safety
                      and reliability. Garnet-type Li7La3Zr2O12 (LLZ) appears as a
                      candidate material, since it shows the highest reported
                      Li-ion conductivity of all oxide ceramics at room
                      temperature (σ > 10− 4 S cm− 1) and at the same time
                      chemical stability against lithium. In this paper, a sol-gel
                      process is presented for fabricating homogeneous thin film
                      LLZ layers. These layers were deposited using dip-coating
                      and spin-coating methods. A stable Yttrium-doped
                      Li-La-Zr-based sol with a particle size of d50 = 10 nm was
                      used as coating liquid. Successful deposition of such layers
                      was accomplished using a sol concentration of 0.04 mol/l,
                      which yielded for each coating step a layer thickness of ~
                      50 nm. The desired single phase LLZ material could be
                      obtained after thermal treatment at 800 °C for 10 min in
                      Argon. Ionic conductivity of the layers was demonstrated
                      with impedance spectroscopy. Continuing work on the
                      development of half-cells is also presented. Half-cells
                      which contain the novel LLZ electrolyte layer, a LiCoO2
                      cathode and a steel support were synthesized and
                      investigated. Of considerable importance was the prevention
                      of Lanthanum diffusion and the formation of non-conductive
                      phases (e.g. La2Li0.5Co0.5O4) at the required heating
                      temperature of 800 °C. It is shown that these unwanted
                      processes can be prevented and that a structure with a
                      single phase LLZ and LiCoO2 layer can be obtained by
                      modifying the heating program to a rapid thermal treatment
                      (10 K/s, 800 °C, no holding time).},
      cin          = {IEK-1},
      ddc          = {070},
      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:000381939700020},
      doi          = {10.1016/j.tsf.2016.07.010},
      url          = {https://juser.fz-juelich.de/record/812031},
}