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Simulation of crack behavior of secondary particles in Li-ion battery electrodes during lithiation/de-lithiation cycles

zhan-sheng guo's picture

The loss of connectivity in particle-based LiMO2 (M = Ni, Co, Al, and/or Mn) electrodes due to mechanical failure
and fracture at the interface between primary particles is one of the major causes of capacity fading in Li-ion
batteries (LIBs) after certain electrochemical cycles. In this study, a model of a secondary particle composed
of randomly distributed primary particles is established using a fractal algorithm. The finite element method
with cohesive crack modeling is employed to simulate the intraparticle fracture within the secondary particle.
The different fracture energies are analyzed during the lithiation process and the crack behavior during the
lithiation/de-lithiation cycling is studied. The fracture energy has a significant influence on crack density and
crack branching. Model I cracks appear at the center of the secondary particle during the lithiation process along
with the crack branching phenomenon. A model II crack appears on the surface of the secondary particle during
the lithiation process. The damage during the electrochemical (lithiation/de-lithiation) cycling results in cracks
within the secondary particle, which can penetrate the entire particle after certain lithiation/de-lithiation cycles.

 

https://authors.elsevier.com/a/1Yg1V4jpxJdhq

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