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@ARTICLE{Arifiadi:1025084,
      author       = {Arifiadi, Anindityo and Schmuch, Richard and Kasnatscheew,
                      Johannes and Winter, Martin},
      title        = {{E}stablishing an {A}ppropriate {V}oltage {W}indow for
                      {S}table {C}ycling of {L}i/{M}n-{R}ich {L}ayered {O}xide ||
                      {G}raphite {F}ull {C}ells},
      journal      = {Meeting abstracts},
      volume       = {MA2023-01},
      number       = {2},
      issn         = {1091-8213},
      address      = {Pennington, NJ},
      publisher    = {Soc.},
      reportid     = {FZJ-2024-02672},
      pages        = {665 - 665},
      year         = {2023},
      note         = {Hierbei handelt es sich lediglich um einen Abstract.},
      abstract     = {Li/Mn-rich layered oxide cathode active materials (LMR)
                      have gained attention due to their exceptionally high
                      practical specific discharge capacity (>250 mAh g-1)
                      originating from both conventional cationic as well as
                      anionic oxygen redox contributions. To achieve this high
                      capacity, the Li2MnO3-like regions of the material, which
                      give rise to oxygen redox need to be electrochemically
                      activated at high voltage (above 4.6 V versus Li+/Li0). This
                      high voltage activation, however, results in the
                      destabilization of lattice oxygen that creates subsequent
                      adverse phenomena such as first-cycle hysteresis and the
                      evolution of redox couples. The latter happens continuously
                      during cycling and results in the activation of Mn3+/Mn4+
                      redox couple. This redox couple involving Mn3+ is
                      problematic because, at this oxidation state, Mn
                      disproportionation reaction can occur, resulting in the
                      formation of highly soluble Mn2+ species. In a half-cell
                      setup, the impact of Mn dissolution may be subtle, however,
                      in LMR||Graphite full cells, the impact is
                      consequential.This work focuses on investigating the
                      degradation mechanism of LMR||Graphite full cells at
                      different voltage windows applied during the activation
                      cycles and the long-term cycling. These different voltage
                      windows alter the redox contributions and thus affect the
                      long-term performance of the cells. We observe that lowering
                      the upper cut-off voltage (UCV) from 4.7 V to 4.5 V during
                      the entire cycling process can increase capacity retention,
                      although rapid degradation can still be observed. Only when
                      the UCV during the long-term cycling is lowered to 4.3 V,
                      can we obtain incremental degradation of the cells. We also
                      show that lowering the activation cycles UCV to 4.5 V is
                      beneficial for long-term cycling due to the lower
                      contribution of Mn3+/Mn4+ redox couple after the activation
                      cycles. Finally, we observe that increasing the lower
                      cut-off voltage from 1.9 V to 2.4 V results in higher
                      discharge voltage. Nevertheless it is followed by a
                      reduction in discharge capacity, resulting in a lower
                      specific energy. This study offers insights into the
                      high-voltage cycling performance of practical LMR||Gr full
                      cells that can be used for the foundation of material design
                      to alleviate the adverse effect of oxygen redox in LMR.},
      cin          = {IEK-12},
      ddc          = {540},
      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},
      doi          = {10.1149/MA2023-012665mtgabs},
      url          = {https://juser.fz-juelich.de/record/1025084},
}