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@ARTICLE{Laptev:838345,
      author       = {Laptev, Alexander M. and Malede, Yohanes C. and Duan,
                      Shanghong and Mücke, Robert and Danilov, Dmitry and Notten,
                      Peter H. L. and Guillon, Olivier},
      title        = {{M}odeling large patterned deflection during lithiation of
                      micro-structured silicon},
      journal      = {Extreme mechanics letters},
      volume       = {15},
      issn         = {2352-4316},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2017-06970},
      pages        = {145 - 150},
      year         = {2017},
      abstract     = {The application of silicon (Si) as potential anode material
                      in Li-ion batteries provides a more than nine-fold increase
                      in gravimetric storage capacity compared to conventional
                      graphite anodes. However, full lithiation of Si induces the
                      volume to increase by approximately $300\%.$ Such enormous
                      volume expansion causes large mechanical stress, resulting
                      in non-elastic deformation and crack formation. This
                      ultimately leads to anode failure and strong decrease in
                      cycle life. This problem can be resolved by making use of
                      structured anodes with small dimensions. Particularly
                      honeycomb-shaped microstructures turned out to be beneficial
                      in this respect. In the present paper, finite element
                      modeling was applied to describe the experimentally observed
                      mechanical deformation of honeycomb-structured Si anodes
                      upon lithiation. A close agreement between simulated and
                      experimentally observed shape changes is observed in all
                      cases. The predictive ability of the model was further
                      exploited by investigating alternative geometries, such as
                      square-based microstructure. Strikingly, dimension and
                      pattern optimization shows that the stress levels can be
                      reduced even below the yield strength, while maintaining the
                      footprint-area-specific storage capacity of the
                      microstructures. The pure elastic deformation is highly
                      beneficial for the fatigue resistance of optimized silicon
                      structures. The obtained results are directly applicable for
                      other (de)lithiating materials, such as mixed
                      ionic–electronic conductors (MIEC) widely applied in
                      Li-ion and future Na-ion batteries.},
      cin          = {IEK-1 / JARA-ENERGY / IEK-9},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / $I:(DE-82)080011_20140620$ /
                      I:(DE-Juel1)IEK-9-20110218},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000418473100021},
      doi          = {10.1016/j.eml.2017.05.001},
      url          = {https://juser.fz-juelich.de/record/838345},
}