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@INPROCEEDINGS{Barysch:1046456,
      author       = {Barysch, Vera and Wolff, Beatrice and Schleker, Peter
                      Philipp Maria and Jakes, Peter and Streun, Matthias and
                      Granwehr, Josef and Eichel, Rüdiger-A.},
      title        = {{DNP} at 0.34 {T} for the {I}nvestigation of {B}atteries},
      reportid     = {FZJ-2025-03809},
      year         = {2025},
      abstract     = {The performance and lifespan of rechargeable lithium
                      batteries are largely determined by intricate interfacial
                      phenomena occurring at the electrode-electrolyte interface.
                      A key element in this process is the solid electrolyte
                      interphase (SEI), a passivating layer that develops on the
                      electrode surface during battery cycling. Despite its
                      importance, the SEI structure and composition remain
                      difficult to characterize.[1] To achieve higher energy
                      densities, battery designs are increasingly exploring
                      anode-free configurations, where lithium is deposited
                      directly onto a current collector like copper, rather than
                      relying on a conventional lithium-based anode. While this
                      approach holds significant promise, it also presents new
                      challenges — most notably, the formation of lithium
                      dendrites. These needle-like structures can pierce the
                      separator, potentially leading to short circuits or battery
                      failure.[2] Despite extensive research on lithium plating
                      and dendrite formation, the molecular formation processes
                      are not yet fully understood.Dynamic nuclear polarization
                      (DNP) provides a powerful means to gain deeper insight into
                      this phenomenon. By transferring polarization from electron
                      spins to nuclear spins, DNP significantly enhances the
                      sensitivity of NMR, particularly under low magnetic field
                      conditions. We present combined EPR and DNP-enhanced 7Li NMR
                      measurements of lithium on copper, performed using a
                      custom-built setup operating at 0.34 T.[3] The resulting
                      enhanced 7Li NMR signal allows for the observation of
                      electrochemically deposited lithium on copper, harvested
                      from a Cu vs. Li cell, with an enhancement larger than 400.
                      Additionally, upon saturation of the lithium electron
                      resonance, the 1H signal from the nearby electrolyte
                      exhibited approximately a twofold enhancement, suggesting
                      the capability to probe the SEI. These measurements utilized
                      a battery cell housing specifically designed for EPR,[4]
                      highlighting its suitability for future in operando
                      studies.Literature:[1] M. A. Hope et al., Nat. Commun. 2020,
                      11, 2224.[2] K.N. Wood et al., ACS Energy Lett. 2, 2017, 3,
                      664.[3] Barysch et al., Sci. Rep. 2025, 15, 18436.[4] A.
                      Niemöller et al., J. Chem. Phys. 2018, 148, 014705.},
      month         = {Sep},
      date          = {2025-09-15},
      organization  = {46. Jahrestagung der Fachgruppe
                       Magnetische Resonanz (FGMR) 2025, Bonn
                       (Germany), 15 Sep 2025 - 18 Sep 2025},
      subtyp        = {Other},
      cin          = {IET-1},
      cid          = {I:(DE-Juel1)IET-1-20110218},
      pnm          = {1223 - Batteries in Application (POF4-122) / HITEC -
                      Helmholtz Interdisciplinary Doctoral Training in Energy and
                      Climate Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF4-1223 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/1046456},
}