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@INPROCEEDINGS{Gehrke:186286,
      author       = {Gehrke, Hans-Gregor and Dellen, Christian and Bitzer,
                      Martin and Lobe, Sandra and Tsai, Chih-Long and Bünting,
                      Aiko and Hammer, Eva-Maria and Uhlenbruck, Sven and Guillon,
                      Olivier},
      title        = {{D}evelopment of nanomaterials for all-solid-state lithium
                      ion batteries},
      reportid     = {FZJ-2015-00370},
      year         = {2014},
      abstract     = {In conventional lithium ion batteries liquid electrolytes
                      are used for the ionic transport. The organic solvents
                      required cause safety issues as flammability and leakage. In
                      order to avoid these hazards, the liquid electrolyte is
                      replaced by solid electrolytes. Lithium ion conducting
                      sulfides [1], oxides [2], and phosphates [3] are developed
                      for the construction of all-solid-state Li-ion batteries. A
                      promising oxide material with desirable properties is the
                      garnet-structured Li7La3Zr2O12 (LLZ). Its ionic conductivity
                      (about 10-4 S/cm) and thermal stability (up to 1250°C) are
                      reasonably high. This material has a very large
                      electrochemical window being stable up to 8 V vs. Li/Li+
                      making it feasible for desired high voltage cathode
                      materials. Partial aliovalent substitution of Li by Al or Zr
                      by Ta lowers the required crystallization temperature of the
                      conductive cubic phase. However, compared to conventional
                      liquid electrolytes, LLZ exhibits an about one order of
                      magnitude higher ionic resistivity. Therefore, to maintain
                      low overall resistances of the cells, thin film electrolytes
                      are desirable to compensate the lower conductivity. The thin
                      film deposition of cubic garnet structured LLZ has posed
                      troubles on non-single crystalline substrates [4,5] so far.
                      We successfully obtained cubic LLZ films by r.f. magnetron
                      sputtering and dip coating on metal foil substrates and
                      cathode material. These films were analyzed by X-ray
                      diffraction, scanning electron microscopy (SEM), secondary
                      ion mass spectrometry (SIMS), and electrochemical tests.
                      Thin electrolyte films were compared to reference bulk
                      materials obtained from solid-state reaction powder
                      synthesis, compaction and sintering..[1] Kamaya et al.,
                      Nature Materials 10 (2011) 682[2] Murugan et al., Angew.
                      Chem. Int. Ed. 46(2007) 7778[3] Propovici et al., J. Am.
                      Ceram. Soc. 94 (2011) 3847[4] Kalita et al., Solid State
                      Ionics 2012 (229) 14[5] Chen et al. J., Mater. Chem. A. 2014
                      Accepted Manuscript},
      month         = {Dec},
      date          = {2014-12-19},
      organization  = {Second International Conference on
                       Nano materials and Nanocomposites,
                       Kottayam (India), 19 Dec 2014 - 21 Dec
                       2014},
      subtyp        = {Invited},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {435 - Energy Storage (POF2-435) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF2-435 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/186286},
}