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@ARTICLE{Homann:874259,
      author       = {Homann, Gerrit and Stolz, Lukas and Nair, Jijeesh and
                      Cekic-Laskovic, Isidora and Winter, Martin and Kasnatscheew,
                      Johannes},
      title        = {{P}oly({E}thylene {O}xide)-based {E}lectrolyte for
                      {S}olid-{S}tate-{L}ithium-{B}atteries with {H}igh {V}oltage
                      {P}ositive {E}lectrodes: {E}valuating the {R}ole of
                      {E}lectrolyte {O}xidation in {R}apid {C}ell {F}ailure},
      journal      = {Scientific reports},
      volume       = {10},
      number       = {1},
      issn         = {2045-2322},
      address      = {[London]},
      publisher    = {Macmillan Publishers Limited, part of Springer Nature},
      reportid     = {FZJ-2020-01350},
      pages        = {4390},
      year         = {2020},
      abstract     = {Polyethylene oxide (PEO)-based solid polymer electrolytes
                      (SPEs) typically reveal a sudden failure in Li metal cells
                      particularly with high energy density/voltage positive
                      electrodes, e.g. LiNi0.6Mn0.2Co0.2O2 (NMC622), which is
                      visible in an arbitrary, time – and voltage independent,
                      “voltage noise” during charge. A relation with SPE
                      oxidation was evaluated, for validity reasons on different
                      active materials in potentiodynamic and galvanostatic
                      experiments. The results indicate an exponential current
                      increase and a potential plateau at 4.6 V vs. Li|Li+,
                      respectively, demonstrating that the main oxidation onset of
                      the SPE is above the used working potential of NMC622 being
                      < 4.3 V vs. Li|Li+. Obviously, the SPE│NMC622 interface
                      is unlikely to be the primary source of the observed sudden
                      failure indicated by the “voltage noise”. Instead, our
                      experiments indicate that the Li | SPE interface, and in
                      particular, Li dendrite formation and penetration through
                      the SPE membrane is the main source. This could be simply
                      proven by increasing the SPE membrane thickness or by
                      exchanging the Li metal negative electrode by graphite,
                      which both revealed “voltage noise”-free operation. The
                      effect of membrane thickness is also valid with LiFePO4
                      electrodes. In summary, it is the cell set-up (PEO
                      thickness, negative electrode), which is crucial for the
                      voltage-noise associated failure, and counterintuitively not
                      a high potential of the positive electrode.},
      cin          = {IEK-12},
      ddc          = {600},
      cid          = {I:(DE-Juel1)IEK-12-20141217},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {32152474},
      UT           = {WOS:000563354500001},
      doi          = {10.1038/s41598-020-61373-9},
      url          = {https://juser.fz-juelich.de/record/874259},
}