Grid indentation analysis of mechanical properties of composite electrodes in Li-ion batteries

doi:10.1016/j.eml.2016.03.002

Title: Grid indentation analysis of mechanical properties of composite electrodes in Li-ion batteries

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We report that electrodes in commercial rechargeable batteries are microscopically heterogeneous materials. The constituent components, including active materials, polymeric binders, and porous conductive matrix, often have large variation in their mechanical properties, making the mechanical characterization of composite electrodes a challenging task. In a model system of LiNi _0.5Mn _0.3Co _0.2O ₂ cathode, we employ the instrumented grid indentation to determine the elastic modulus and hardness of the constituent phases. The approach relies on a large array of nanoindentation experiments and statistical analysis of the resulting data provided that the maximum indentation depth is carefully chosen. The statistically extracted properties of the active particles and the surrounding medium are in good agreement with the tests of targeted indentation at selected sites. Lastly, the combinatory technique of grid indentation and statistical deconvolution represents a fast and reliable route to quantify the mechanical properties of composite electrodes that feed the parametric input for the mechanics models.

Authors:

; Xu, Rong ^[1] ; ; Zhao, Kejie ^[1]

Purdue Univ., West Lafayette, IN (United States). School of Mechanical Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Science Division

Publication Date:: 2016-03-09

Grant/Contract Number:: AC05-00OR22725

Type:: Accepted Manuscript

Journal Name:: Extreme Mechanics Letters

Additional Journal Information:: Journal Name: Extreme Mechanics Letters; Journal ID: ISSN 2352-4316

Publisher:: Elsevier

Research Org:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 25 ENERGY STORAGE

OSTI Identifier:: 1302942

Alternate Identifier(s):: OSTI ID: 1397349


                    Vasconcelos, Luize Scalco de, Xu, Rong, Li, Jianlin, and Zhao, Kejie. Grid indentation analysis of mechanical properties of composite electrodes in Li-ion batteries.  United States: N. p.,  
        Web.  doi:10.1016/j.eml.2016.03.002.

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                    Vasconcelos, Luize Scalco de, Xu, Rong, Li, Jianlin, & Zhao, Kejie. Grid indentation analysis of mechanical properties of composite electrodes in Li-ion batteries.  United States.  doi:10.1016/j.eml.2016.03.002.

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                    Vasconcelos, Luize Scalco de, Xu, Rong, Li, Jianlin, and Zhao, Kejie. 2016.  
        "Grid indentation analysis of mechanical properties of composite electrodes in Li-ion batteries".  United States.  
        doi:10.1016/j.eml.2016.03.002.  https://www.osti.gov/servlets/purl/1302942.

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@article{osti_1302942,

  title        = {Grid indentation analysis of mechanical properties of composite electrodes in Li-ion batteries},

  author       = {Vasconcelos, Luize Scalco de and Xu, Rong and Li, Jianlin and Zhao, Kejie},

  abstractNote = {We report that electrodes in commercial rechargeable batteries are microscopically heterogeneous materials. The constituent components, including active materials, polymeric binders, and porous conductive matrix, often have large variation in their mechanical properties, making the mechanical characterization of composite electrodes a challenging task. In a model system of LiNi0.5Mn0.3Co0.2O2 cathode, we employ the instrumented grid indentation to determine the elastic modulus and hardness of the constituent phases. The approach relies on a large array of nanoindentation experiments and statistical analysis of the resulting data provided that the maximum indentation depth is carefully chosen. The statistically extracted properties of the active particles and the surrounding medium are in good agreement with the tests of targeted indentation at selected sites. Lastly, the combinatory technique of grid indentation and statistical deconvolution represents a fast and reliable route to quantify the mechanical properties of composite electrodes that feed the parametric input for the mechanics models.},

  doi          = {10.1016/j.eml.2016.03.002},

  journal      = {Extreme Mechanics Letters},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {2016},

  month        = {3}

}

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Free Publicly Accessible Full Text
Accepted Manuscript (Publisher)
Accepted Manuscript (DOE)
Publisher's Version of Record
10.1016/j.eml.2016.03.002
https://doi.org/10.1016/j.eml.2016.03.002

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Title: Grid indentation analysis of mechanical properties of composite electrodes in Li-ion batteries

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