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@INPROCEEDINGS{Wolff:873907,
      author       = {Wolff, Michael and Guillon, Olivier},
      collaboration = {Lobe, Sandra and Sebold, Doris and Uhlenbruck, Sven and
                      Fattakhova-Rohlfing, Dina},
      title        = {{S}ol-gel surface coating of cathodematerials for lithium
                      ion batteries},
      reportid     = {FZJ-2020-01092},
      year         = {2019},
      abstract     = {Lithium ion batteries play an important role in the field
                      of electromobility and stationary energy storage.
                      Unfortunately, their improvable energy density, efficiency
                      and lifetime still limit their comprehensive application.
                      Major issues with respect to cathode degradation involve
                      metal ion dissolution due to hydrofluoric acid etching,
                      cation disorder or unwanted phase transitions. The sol-gel
                      method is a useful and widely used strategy to apply
                      functional cathode coatings which prevent the direct contact
                      with the HF-containing electrolyte. These protective
                      coatings not only prevent unwanted side reactions but also
                      reduce heat generation during cycling resulting in an
                      improved electrochemical performance. An initial evaluation
                      of chemical and electrochemical influence of sol-gel
                      coatings (e.g. ZrO2, ZnO) on planar model electrodes
                      produced by radiofrequency magnetron sputtering (e.g.
                      LiCoO2) is conducted. Besides electric and ionic
                      conductivities, surface morphologies and chemical
                      compositions of the respective coatings are investigated.
                      Based on the findings regarding wetting behavior of the
                      sol-gel film and the intrinsic mechanism between the
                      different thin film layers, the coating process is further
                      optimized: Surface pretreatment, sol precursor selection,
                      dip- and spin coating process parameters as well as heat
                      treatment parameters are equally taken into account. In
                      consideration of economic aspects, the previously identified
                      coatings are transferred to commercial cathode materials in
                      powder form. For this purpose, a variety of different
                      precursors, solvents and dispersion agents are evaluated and
                      optimized aiming for a uniform coating with a layer
                      thickness in the nanometer range.},
      month         = {Aug},
      date          = {2019-08-25},
      organization  = {XX International Sol-Gel Conference,
                       St. Petersburg (Russia), 25 Aug 2019 -
                       30 Aug 2019},
      subtyp        = {Other},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/873907},
}