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@ARTICLE{Rittweger:885676,
      author       = {Rittweger, Florian and Modrzynski, Christian and Roscher,
                      Valentin and Danilov, Dmitry L. and Notten, Peter H. L. and
                      Riemschneider, Karl-Ragmar},
      title        = {{I}nvestigation of charge carrier dynamics in positive
                      lithium-ion battery electrodes via optical in situ
                      observation},
      journal      = {Journal of power sources},
      volume       = {482},
      issn         = {0378-7753},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2020-04007},
      pages        = {228943 -},
      year         = {2021},
      abstract     = {We present optical in situ investigations of lithium-ion
                      dynamics in lithium iron phosphate based positive
                      electrodes. The change in reflectivity of these cathodes
                      during charge and discharge is used to estimate apparent
                      diffusion coefficients for the lithiation and delithiation
                      process of the entire electrode. Thereby, a scaling analysis
                      of the transport process is applied, which clearly reveals
                      its diffusive character.Results are shown for cathodes, in
                      which the common additive carbon as well as the conductive
                      and electrochromic marker additives (indium tin oxide and
                      antimony tin oxide) are used. The latter leads to a
                      substantial increase of visibility of the optical effect in
                      the cathodes while electric properties remain qualitatively
                      unchanged.The procedure extends common characterization
                      techniques of positive electrode materials via a novel and
                      integral combination of electrical and optical
                      measurements.},
      cin          = {IEK-9},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-9-20110218},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000597242900009},
      doi          = {10.1016/j.jpowsour.2020.228943},
      url          = {https://juser.fz-juelich.de/record/885676},
}