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@INPROCEEDINGS{Tsai:842143,
      author       = {Tsai, Chih-Long and Lobe, Sandra and Windmüller, Anna and
                      Dellen, Christian and Uhlenbruck, Sven and Guillon, Olivier},
      title        = {{T}hin film deposition of garnet electrolytes for high
                      energy density all-solid-state lithium batteries},
      reportid     = {FZJ-2018-00422},
      year         = {2017},
      abstract     = {Thin film deposition of garnet electrolytes for high energy
                      density all-solid-state lithium batteriesIn recent years
                      battery research concentrated on reaching batteries with
                      high energy and power density and high safety at the same
                      time. A combination of high-voltage cathode materials and
                      solid electrolytes are one approach to fulfill the
                      requirements of future cell technologies. A promising solid
                      electrolyte is the garnet structured Li7La3Zr2O12 (LLZ)
                      because of its high Li-ion conductivity (around 1 mS cm-1)
                      and high chemical (stable with lithium metal) and
                      electrochemical stability. If the solid electrolyte is
                      applied as a thin film, the energy density of the cell will
                      increase remarkably.Our group already showed the deposition
                      of LLZ thin films with a thickness of around 1.8 µm on
                      steel substrates by sputter deposition [1]. The layers
                      showed an in-plane conductivity of 1.2x10-4 S cm-1 at room
                      temperature, which is comparable to bulk LLZ and is the
                      highest value for garnet-structured thin films so far.
                      However, the required high deposition temperature of 700°C
                      leads to unwanted side reactions with the used substrate.
                      This reaction gives a Li-Al-O interlayer with high ionic
                      resistance which makes it not possible for battery
                      application.For a successful combination of LLZ thin films
                      with high-voltage cathodes a decrease of deposition
                      temperature is mandatory, for example high-voltage spinels
                      react with LLZ at temperatures around 500°C [2]. Sputter
                      deposition is a useful technique for depositing thin films
                      far from thermodynamic equilibrium, e.g. the deposition of
                      the high temperature phase of LiCoO2 cathode at around
                      500°C shows how powerful the technique can be [3]. As a
                      further advantage, sputter deposition processes are
                      comparably easy up-scalable, which would facilitate
                      industrial application.In this presentation, different
                      approaches for lowering the deposition temperature as well
                      as the influence of deposition parameters and annealing
                      conditions on the composition, microstructure and
                      electrochemical properties of garnet-structured thin films
                      will be discussed. Approaches of combining garnet-structured
                      thin films with high-voltage cathode materials will also be
                      presented.},
      month         = {Sep},
      date          = {2017-09-06},
      organization  = {1st World conference on Solid
                       Electrolytes for Advanced Applications:
                       Garnets and Competitors, Pondicherry
                       (India), 6 Sep 2017 - 9 Sep 2017},
      cin          = {IEK-1 / JARA-ENERGY},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / $I:(DE-82)080011_20140620$},
      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)1},
      url          = {https://juser.fz-juelich.de/record/842143},
}