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@ARTICLE{Beltrop:851243,
      author       = {Beltrop, Kolja and Klein, Sven and Nölle, Roman and
                      Wilken, Andrea and Lee, Juhyon J. and Köster, Thomas K.-J.
                      and Reiter, Jakub and Tao, Liang and Liang, Chengdu and
                      Winter, Martin and Qi, Xin and Placke, Tobias},
      title        = {{T}riphenylphosphine {O}xide as {H}ighly {E}ffective
                      {E}lectrolyte {A}dditive for {G}raphite/{NMC}811 {L}ithium
                      {I}on {C}ells},
      journal      = {Chemistry of materials},
      volume       = {30},
      number       = {8},
      issn         = {1520-5002},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2018-04938},
      pages        = {2726 - 2741},
      year         = {2018},
      abstract     = {Nickel-rich layered oxide materials (LiNixMnyCo1–x–yO2,
                      x ≥ 0.8, LiNMC) attract great interest for application as
                      positive electrode in lithium ion batteries (LIBs) due to
                      high specific discharge capacities at moderate upper cutoff
                      voltages below 4.4 V vs Li/Li+. However, the comparatively
                      poor cycling stability as well as inferior safety
                      characteristics prevent this material class from commercial
                      application so far. Against this background, new electrolyte
                      formulations including additives are a major prerequisite
                      for a sufficient electrochemical performance of Ni-rich NMC
                      materials. In this work, we introduce triphenylphosphine
                      oxide (TPPO) as electrolyte additive for the application in
                      graphite/LiNi0.8Mn0.1Co0.1O2 (NMC811) cells. The addition of
                      only 0.5 wt $\%$ TPPO into a carbonate-based electrolyte
                      (LiPF6 in EC:EMC) significantly increases the first cycle
                      Coulombic efficiency as well as the reversible specific
                      capacity and improves the capacity retention of the LIB full
                      cell cycled between 2.8 and 4.3 V. Electrochemical results
                      indicate that the full cell capacity fade is predominantly
                      caused by active lithium loss at the negative electrode. In
                      this contribution, X-ray photoelectron spectroscopy and
                      inductively coupled plasma-mass spectrometry analysis
                      confirm the participation of the electrolyte additive in the
                      solid electrolyte interphase formation on the negative
                      electrode as well as in the cathode electrolyte interphase
                      formation on the positive electrode, thus, effectively
                      reducing the active lithium loss during cycling.
                      Furthermore, the performance of the TPPO additive is
                      compared to literature known electrolyte additives including
                      triphenylphosphine, vinylene carbonate, and diphenyl
                      carbonate demonstrating the outstanding working ability of
                      TPPO in graphite/NMC811 cells.},
      cin          = {IEK-12},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-12-20141217},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000431088400029},
      doi          = {10.1021/acs.chemmater.8b00413},
      url          = {https://juser.fz-juelich.de/record/851243},
}