Consequences of Plane-Strain and Plane-Stress Assumptions in Fully Coupled Chemo-Mechanical Li-Ion Battery Models: Article No. 143790

Kasra Taghikhani, Avtar Singh, Peter Weddle, Andrew Colclasure, Kandler Smith, J. R. Berger, Robert Kee

Research output: Contribution to journalArticlepeer-review

Abstract

In Li-ion battery research, it is common to simulate chemo-mechanical phenomena in reduced dimensions (e.g., 2-D) as opposed to fully resolve these complex physics in 3-D. It is common to assume either (1) the out-of-plane strain is negligible (commonly referred to as plane-strain), or (2) the out-of-plane stress is negligible (commonly referred to as plane-stress). However, there is typically little consideration as to the quantitative consequences of these approximations. Furthermore, the influence of these out-of-plane assumptions can be compounded and convoluted when chemo-mechanics models implement so-called "fully coupled" formulations, where the local species concentrations influence the stress-state and the stress-state influences the local species fluxes. The present manuscript explores the implications of using plane-stress and plane-strain assumptions in 2-D as compared to simulating a full 3-D electrode particle. This comparative study includes simulating both isotropic and anisotropic particle intercalation where the particles can be surrounded by either a liquid or solid electrolyte. Additionally, common Li-ion battery-model metrics such as the state-of-stress, intercalation fraction distribution, and specific capacity are compared, while also considering the effects of particle size and C-rate. As alternatives to the pure plane-strain and plane stress approximations, two modified plane-strain assumptions are found to better approximate the fully coupled chemo-mechanical 3-D behavior.
Original languageAmerican English
Number of pages13
JournalElectrochimica Acta
Volume479
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5700-87587

Keywords

  • electro-chemo-mechanical model
  • Li-ion battery
  • plane-strain
  • plane-stress

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