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@ARTICLE{Klein:903576,
      author       = {Klein, Sven and Wrogemann, Jens Matthies and van Wickeren,
                      Stefan and Harte, Patrick and Bärmann, Peer and Heidrich,
                      Bastian and Hesper, Jakob and Borzutzki, Kristina and Nowak,
                      Sascha and Börner, Markus and Winter, Martin and
                      Kasnatscheew, Johannes and Placke, Tobias},
      title        = {{U}nderstanding the {R}ole of {C}ommercial {S}eparators and
                      {T}heir {R}eactivity toward {L}i{PF} 6 on the {F}ailure
                      {M}echanism of {H}igh‐{V}oltage {NCM}523 || {G}raphite
                      {L}ithium {I}on {C}ells},
      journal      = {Advanced energy materials},
      volume       = {12},
      number       = {2},
      issn         = {1614-6832},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2021-05231},
      pages        = {2102599 -},
      year         = {2022},
      abstract     = {NCM523 || graphite lithium ion cells operated at 4.5 V are
                      prone to an early “rollover” failure, due to electrode
                      cross-talk, that is, transition metal (TM = Mn, Ni, and Co)
                      dissolution from NCM523 and deposition at graphite,
                      subsequent formation of Li metal dendrites, and, in the
                      worst case, generation of (micro-)short-circuits by
                      dendrites growing to the cathode. Here, the impact of
                      different separators on the high-voltage performance of
                      NCM523 || graphite cells is elucidated focusing on the
                      separators’ structural properties (e.g., membrane vs
                      fiber) and their reactivity toward LiPF6 (e.g.,
                      ceramic-coated separators). First, the separator
                      architecture has a major impact on cycle life.
                      Fiber-structured separators can prevent the “rollover”
                      failure by a more homogeneous deposition of TMs and
                      formation of Li metal dendrites, thus, hindering penetration
                      of dendrites to the cathode. In contrast, porous
                      membrane-structured separators cannot prevent the cell
                      failure due to inhomogeneous TM deposits/Li metal dendrites.
                      Second, it is demonstrated that different types of
                      ceramic-coated separators (Boehmite (γ-AlO(OH)) vs
                      α-Al2O3) exhibit different reactivities toward LiPF6. While
                      α-Al2O3 shows a minor reactivity toward LiPF6, the
                      γ-AlO(OH) coating leads to in situ formation of the
                      beneficial difluorophosphate anion in high amounts due the
                      high reactivity toward LiPF6 decomposition, which
                      significantly improves cycle life.},
      cin          = {IEK-12},
      ddc          = {050},
      cid          = {I:(DE-Juel1)IEK-12-20141217},
      pnm          = {1221 - Fundamentals and Materials (POF4-122)},
      pid          = {G:(DE-HGF)POF4-1221},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000725443500001},
      doi          = {10.1002/aenm.202102599},
      url          = {https://juser.fz-juelich.de/record/903576},
}