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    Fracture predictions based on a coupled chemo-mechanical model with strain gradient plasticity theory for film electrodes of Li-ion batteries

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    Authors
    Chen, Y.
    Sang, M.
    Jiang, W.
    Wang, Y.
    Zou, Y.
    Lu, Chunsheng
    Ma, Z.
    Date
    2021
    Type
    Journal Article
    
    Metadata
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    Citation
    Chen, Y. and Sang, M. and Jiang, W. and Wang, Y. and Zou, Y. and Lu, C. and Ma, Z. 2021. Fracture predictions based on a coupled chemo-mechanical model with strain gradient plasticity theory for film electrodes of Li-ion batteries. Engineering Fracture Mechanics. 253: Article No. 107866.
    Source Title
    Engineering Fracture Mechanics
    DOI
    10.1016/j.engfracmech.2021.107866
    ISSN
    0013-7944
    Faculty
    Faculty of Science and Engineering
    School
    School of Civil and Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/85068
    Collection
    • Curtin Research Publications
    Abstract

    High-capacity electrodes in Li-ion batteries inevitably undergo a large volume deformation originating from high diffusion-induced stresses during charging and discharging processes. In this paper, we firstly develop a new elastoplastic model for describing diffusion-induced deformation in the framework of high-density dislocation defects generated due to the migration of Li atoms. Then, we analyze the film size effect, diffusion-induced stress, plastic yielding, and hardening of electrode materials based on the evolutions of Li concentration by a strategy combining the strain gradient plasticity theory and finite element simulations. Finally, according to the traction-separation law, interface damage and debonding are characterized in the active film materials (with a thickness of 150, 200, and 250 nm, respectively) on a rigid substrate.

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