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@ARTICLE{Buchheit:890814,
      author       = {Buchheit, Annika and Grünebaum, Mariano and Teßmer,
                      Britta and Winter, Martin and Wiemhöfer, Hans-Dieter},
      title        = {{P}olycarbonate-{B}ased {L}ithium {S}alt-{C}ontaining
                      {E}lectrolytes: {N}ew {I}nsights into {T}hermal {S}tability},
      journal      = {The journal of physical chemistry / C},
      volume       = {125},
      number       = {8},
      issn         = {1932-7455},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2021-01222},
      pages        = {acs.jpcc.0c09968},
      year         = {2021},
      abstract     = {For investigation of the thermal stability of
                      polycarbonate-based lithium salt-containing electrolytes,
                      polycarbonate–salt mixtures [polyethylene carbonate (PEC)
                      and polypropylene carbonate (PPC) with lithium
                      bis(trifluoromethanesulfonyl)imide (LiTFSI)] were heated to
                      100 °C and the conductivity was monitored with
                      electrochemical impedance spectroscopy for at least 24 h. At
                      a constant high temperature, the observed rise in
                      conductivity can be correlated to degradation of long-chain
                      polymer units to small-chain polymer units as the viscosity
                      decreases with a shorter chain length. In both cases,
                      degradation can be observed. With PEC–LiTFSI, it takes
                      ≈9 h until total degradation; with PPC–LiTFSI, the
                      process is slower. Additionally, we repeated the experiments
                      with PEC and other Li salts such as lithium
                      trifluoromethanesulfonate (LiOTf), lithium
                      bis(pentafluoroethanesulfonyl)imide (LiBETI), and lithium
                      difluoro(oxalato)borate (LiDFOB). These experiments resulted
                      in the degradation being dependent on the electrophilic
                      activation by the lithium salt. With different Li-free salts
                      such as sodium bis(trifluoromethanesulfonyl)imide (NaTFSI),
                      potassium bis(trifluoromethanesulfonyl)imide (KTFSI), and
                      1-butyl-1-methylpyrrolidinium
                      bis(trifluoromethylsulfonyl)imide (Pyr14TFSI), no
                      degradation of the polymer is observable. As a degradation
                      mechanism, we anticipate a depolymerization of PEC at the
                      α-carbon of the carbonate group in the polymer chain in the
                      presence of a lithium salt with a weakly coordinating
                      anion.},
      cin          = {IEK-12},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-12-20141217},
      pnm          = {122 - Elektrochemische Energiespeicherung (POF4-122)},
      pid          = {G:(DE-HGF)POF4-122},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000626769100007},
      doi          = {10.1021/acs.jpcc.0c09968},
      url          = {https://juser.fz-juelich.de/record/890814},
}