Classification of spatio-temporal patterns in charging and discharging of Li-ion batteries

Moshe Sheintuch*, Olga Nekhamkina

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We classify the dynamic patterns that emerge in charging or discharging of Li-ion batteries, under galvanostatic conditions, using simulations of the two-phase one-dimensional (1D) porous electrode model. This work examines the effect of the exchange current function, R0(X), which expresses the nature of kinetics. This extends our previous study with R0 = 1 where the same pattern emerges in charging or discharging, whether as a homogeneous or a step-wise process made of multiple symmetry breaking events. With commonly-used asymmetric R0(X), the emerging patterns may be one of the two above or as fronts that follow single SB event and the lithiation/delithiation behaviors are different. These effects are clear when parameters are uniform; nonuniformity leads to noise that mask the behavior. The full four-variable model exhibits SB, even in absence of noise, since the liquid potential gradient ((Formula presented.)) works like a perturbation. This similarity allows us to derive approximations to the full model behavior.

Original languageEnglish
JournalAICHE Journal
DOIs
StateAccepted/In press - 2022
Externally publishedYes

Keywords

  • electrochemistry
  • process
  • reactor analysis
  • simulation

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