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A microstructural analysis of LIB electrodes with the sequentially coupled numerical framework using the FEM and the DEM

A microstructural analysis of LIB electrodes with the sequentially coupled numerical framework using the FEM and the DEM

Date28th May 2021

Time02:00 PM

Venue Through Google Meet: https:// meet.google.com/wdv-xbde-pkq

Details

Li ion batteries are widely being used for the various applications and serve as the solutions for the storage of the renewable energy sources. These LIBs are superior over the conventional primary batteries due to the various reasons including the high volumetric and gravimetric densities, wide operating conditions, less environmental hazard among a few others. However, it is well known that the performance and longevity of the batteries are affected due to the stress-diffusion interactions in the active particles which chiefly constitute the microstructure of the electrodes of the batteries. In the present work, a sequential framework is developed to analyse the electrode microstructure due to the potentiostatic charge and discharge using the numerical tools viz., the Finite Element Method (FEM) and the Discrete Element Method (DEM). As a consequence of the diffusion of Li ions in/out of the particles, the resulting expansion/shrinkage of the individual particles is captured using the FEM by incorporating the stress-diffusion interaction. Due to the changes in the sizes of the particles, the alteration in the microstructure is captured using the DEM. Based on the aforementioned framework, a parametric study is carried out on the microstructures of the graphite electrode. The mono and poly-sized assemblies of active particles with the varying packing fractions are considered for the study. The potentiostatic charge and discharge studies are carried out on these assemblies. The changes in the microstructure are quantified using the instantaneous packing fraction of the assembly, the mean distance traversed by the particles during the DEM etc. Furthermore, the effect of the increased partial molar volume of the active particles are studied on the assemblies. In the present talk, the results of the carried out microstructural studies will be discussed in detail.

Speakers

Mr. Pramod Yallappa Kumbhar (ME15D411)

Department of Mechanical Engineering