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@ARTICLE{Weiling:1019323,
      author       = {Weiling, Matthias and Lechtenfeld, Christian and Pfeiffer,
                      Felix and Frankenstein, Lars and Diddens, Diddo and Wang,
                      Jian-Fen and Nowak, Sascha and Baghernejad, Masoud},
      title        = {{M}echanistic {U}nderstanding of {A}dditive {R}eductive
                      {D}egradation and {SEI} {F}ormation in {H}igh‐{V}oltage
                      {NMC}811||{S}i{O} x ‐{C}ontaining {C}ells via {O}perando
                      {ATR}‐{FTIR} {S}pectroscopy},
      journal      = {Advanced energy materials},
      volume       = {14},
      number       = {5},
      issn         = {1614-6832},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2023-05297},
      pages        = {2303568},
      year         = {2024},
      abstract     = {The implementation of silicon (Si)-containing negative
                      electrodes is widely discussed as an approach to increase
                      the specific capacity of lithium-ion batteries. However,
                      challenges caused by severe volume changes and continuous
                      (re-)formation of the solid-electrolyte interphase (SEI) on
                      Si need to be overcome. The volume changes lead to
                      electrolyte consumption and active lithium loss, decaying
                      the cell performance and cycle life. Herein, the additive 2
                      sulfobenzoic acid anhydride (2 SBA) is utilized as an
                      SEI-forming electrolyte additive for SiOx-containing anodes.
                      The addition of 2 SBA to a state-of-the-art carbonate-based
                      electrolyte in high-voltage $NMC811||AG+20\%$ SiOx pouch
                      cells leads to improved electrochemical performance,
                      resulting in a doubled cell cycle life. The origin of the
                      enhanced cell performance is mechanistically investigated by
                      developing an advanced experimental technique based on
                      operando attenuated total reflection Fourier-transform
                      infrared (ATR-FTIR) spectroscopy. The operando ATR-FTIR
                      spectroscopy results elucidate the degradation mechanism via
                      anhydride ring-opening reactions after electrochemical
                      reduction on the anode surface. Additionally, ion
                      chromatography conductivity detection mass spectrometry,
                      scanning electron microscopy, energy dispersive X-ray
                      analysis, and quantum chemistry calculations are employed to
                      further elucidate the working mechanisms of the additive and
                      its degradation products.},
      cin          = {IEK-12},
      ddc          = {050},
      cid          = {I:(DE-Juel1)IEK-12-20141217},
      pnm          = {1221 - Fundamentals and Materials (POF4-122) /
                      Elektrolytformulierungen für Lithiumbatterien der nächsten
                      Generation mit großer Energiedichte und hoher
                      Beständigkeit (13XP5129)},
      pid          = {G:(DE-HGF)POF4-1221 / G:(BMBF)13XP5129},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001122818800001},
      doi          = {10.1002/aenm.202303568},
      url          = {https://juser.fz-juelich.de/record/1019323},
}