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@ARTICLE{Dellen:809434,
      author       = {Dellen, Christian and Gehrke, Hans-Gregor and Möller,
                      Sören and Tsai, Chih-Long and Breuer, Uwe and Uhlenbruck,
                      Sven and Guillon, Olivier and Finsterbusch, Martin and Bram,
                      Martin},
      title        = {{T}ime-of-flight secondary ion mass spectrometry study of
                      lithium intercalation process in {L}i{C}o{O}$_2$ thin film},
      journal      = {Journal of power sources},
      volume       = {321},
      issn         = {0378-7753},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2016-02540},
      pages        = {241-247},
      year         = {2016},
      abstract     = {A detailed time-of-flight secondary ion mass spectrometry
                      (ToF-SIMS) analysis of the lithium de-/intercalation in thin
                      films of the insertion cathode material lithium cobalt oxide
                      is presented. The LiCoO2 (LCO) thin films are deposited by
                      radio frequency magnetron sputtering at 600 °C, having a
                      (003) preferred orientation after the deposition. The thin
                      electrode films are cycled with liquid electrolyte against
                      lithium metal, showing $80-86\%$ extractable capacities.
                      After disassembling the cells, the depth resolved elemental
                      distribution in the LCO is investigated by ToF-SIMS and glow
                      discharge optical emission spectroscopy. Both techniques
                      show a stepwise lithium distribution in charged state,
                      leading to a lithium depleted layer close to the surface. In
                      combination with the electrochemical results, the
                      qualitative comparison of the different lithium depth
                      profiles yields a reversible lithium extraction in the
                      depleted area below the stability limit for bulk materials
                      of LCO. For bulk LCO, a phase change normally occurs when
                      the lithium concentration in LixCoO2 is lower than x=0.5. As
                      a possible cause for the inhibition of the phase change, the
                      preferred orientation and thus pinning of the crystal
                      structure of the film by the substrate is proposed.},
      cin          = {IEK-1 / JARA-ENERGY / IEK-4 / ZEA-3},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / $I:(DE-82)080011_20140620$ /
                      I:(DE-Juel1)IEK-4-20101013 / I:(DE-Juel1)ZEA-3-20090406},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113) / HITEC - Helmholtz Interdisciplinary Doctoral
                      Training in Energy and Climate Research (HITEC)
                      (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-113 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000377729200027},
      doi          = {10.1016/j.jpowsour.2016.04.084},
      url          = {https://juser.fz-juelich.de/record/809434},
}