A thermo-chemo-mechanically coupled model for cathode particles in lithium–ion batteries

Abstract

As the demand for lithium-ion batteries increases, a better understanding of the complex phenomena involved in their operation becomes crucial. In this work, we propose a coupled thermo-chemo-mechanical model for electrode particles of Li–ion batteries. To this end, we start with a general finite strain continuum framework for the coupled thermo-chemo-mechanical problem and then narrow it down to cathode active particles of Li–ion batteries, particularly to lithium manganese oxide particles. Electrochemical kinetics at the surface of the particle and also heat generation due to current exchange are taken into account. Next, the numerical treatment of the problem using the finite element method is presented. Specific line elements are needed to evaluate the flux of ions at the surface of the particle. Finally, the performance of the proposed model is evaluated using a few representative boundary value problems.

Monolithic parallel overlapping Schwarz methods in fully-coupled nonlinear chemo-mechanics problems

“…Chemo-mechanics problems have gained increasing attention in the past decades, as a more refined understanding of processes in man-made and natural materials as well as living tissue can only be obtained by incorporation of mechanical and chemical loading conditions and their mutual interactions. Research in various fields of chemo-mechanics have emerged and are concerned for example with the coupling of deformation and diffusion in gels [18,19,28,42,58], the prediction of the transition from pitting corrosion to crack formation in metals [17,20], hydrogen diffusion [22,55] and embrittlement [1,4,45], functional degradation in Li-ion batteries [53,54], chemical reaction-induced degradation of concrete [52,64], diffusion mediated tumor growth [29,65], or modeling of lithium-ion batteries [51].…”

Impact of Mechanical Degradation in Polycrystalline NMC Particle on the Electrochemical Performance of Lithium-Ion Batteries

“…The lithium-ion battery is a sophisticated system comprising various interconnected physical processes, including electrical, thermal, chemical, and mechanical processes. 26,27 These processes interact with each other, leading to a complex and intricate coupling within the battery. For instance, the lithium (Li) concentration field influences the mechanical aspects through chemical strain, while the concentration field also influences the occurrence of damage.…”