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@INPROCEEDINGS{Basak:912049,
      author       = {Basak, Shibabrata and Tavabi, Amir Hossein and George,
                      Chandramohan and Mayer, Joachim and Dunin-Borkowski, Rafal
                      and Eichel, Rüdiger-A.},
      title        = {{T}hickness dependent coating breaking during battery
                      cycling by in situ {TEM}},
      reportid     = {FZJ-2022-05276},
      year         = {2022},
      abstract     = {Si has gained considerable attraction as an anode material
                      in Li-ion batteries, in which composite electrodes that have
                      different amounts of Si and carbon (with a theoretical
                      capacity for Si of above ∼4000 mAhg-1 based on a Li22S5
                      stoichiometry) offer an enhancement in capacity when
                      compared with pure graphite powder (∼370 mAhg−1).
                      However, the breaking of Si particles because of strain
                      caused by repeated lithiation (during battery
                      charge/discharge cycles) limits exploitation of their full
                      capacity and rate capabilities. In particular, the large
                      volume change $(>300\%)$ of Si particles upon lithiation can
                      result in particle pulverisation, accompanied by excessive
                      solid electrolyte interphase (SEI) formation. The
                      size-dependent cracking and shape-dependent lithiation
                      behavior of Si has been reported, which provided indications
                      about how the mechanical characteristics of Si particles
                      evolve during battery cycling and affect their
                      electrochemical performance. Even nanosized particles that
                      do not easily break [1] during charge/discharge cycles owing
                      to improved strain relaxation are still plagued by excessive
                      electrolyte consumption associated with multiple SEI
                      formation events, which causes rapid depletion of cyclable
                      Li. Conformal coating of silicon (Si) anode particles is a
                      common strategy for improving their mechanical integrity, to
                      mitigate battery capacity fading due to particle volume
                      expansion, which can result in particle crumbling due to
                      lithiation induced strain and excessive solid–electrolyte
                      interface formation. Here, we use in situ transmission
                      electron microscopy in an open cell to show that TiO2
                      coatings on Si/SiO2 particles undergo thickness dependent
                      rupture on battery cycling where thicker coatings crumble
                      more readily than thinner (∼5 nm) coatings, which
                      corroborates the difference in their capacities [2].},
      month         = {May},
      date          = {2022-05-08},
      organization  = {The Seventh Conference on Frontiers of
                       Aberration Corrected Electron
                       Microscopy, Kasteel Vaalsbroek
                       (Netherlands), 8 May 2022 - 12 May
                       2022},
      subtyp        = {Invited},
      cin          = {IEK-9 / ER-C-1 / ER-C-2},
      cid          = {I:(DE-Juel1)IEK-9-20110218 / I:(DE-Juel1)ER-C-1-20170209 /
                      I:(DE-Juel1)ER-C-2-20170209},
      pnm          = {1223 - Batteries in Application (POF4-122) / 5351 -
                      Platform for Correlative, In Situ and Operando
                      Characterization (POF4-535) / 5353 - Understanding the
                      Structural and Functional Behavior of Solid State Systems
                      (POF4-535) / Electroscopy - Electrochemistry of
                      All-solid-state-battery Processes using Operando Electron
                      Microscopy (892916)},
      pid          = {G:(DE-HGF)POF4-1223 / G:(DE-HGF)POF4-5351 /
                      G:(DE-HGF)POF4-5353 / G:(EU-Grant)892916},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/912049},
}