Multi-scale and multi-physics modelling of Li-ion batteries: a computational homogenization approach.
Alberto Salvadori (University of Brescia / TUe), Davide Grazioli (University of Brescia, Italy)
Lithium ion batteries: When Chemistry meets Mechanics
Tue 10:45 - 12:15
Salomon 003
There is being great interest in developing next generation of lithium ion battery for higher capacity and longer life of cycling, in order to develop significantly more demanding energy storage requirements for humanity existing and future inventories of power-generation and energymanagement systems. Very large mechanical stresses associated with volume changes during Li intercalation/deintercalation are responsible for poor cyclic behaviors and quick fading of electrical performance. The present contribution aims at providing scientific contributions in this vibrant context. The computational homogenization scheme is here tailored to model the coupling between electrochemistry and mechanical phenomena that coexist during batteries charging and discharging cycles. At the macro-scale, diffusion-advection equations model the electro-chemistry of the whole cell, whereas the micro-scale models the multi-component porous electrode, diffusion and intercalation of Lithium in the active particles, the swelling and fracturing of the latter. The scale transitions are formulated by extending and tailoring the well established first-order computational homogenization scheme to coupled problems.