We are pleased to announce that Ralf Jänicke, professor at the Institute of Applied Mechanics of the TU Braunschweig (GER), will give the SFB 1313 "Pretty Porous Science Lecture" #57. His talk will be on "Multiscale Computational Modeling of Electro-Chemo-Mechanical interactions in Structural Battery electrode materials".
Date: 18 October 2024
Time: 3 pm CET
Speaker: Prof. Dr.-Ing. Ralf Jänicke, TU Braunschweig (GER)
Lecture title: "Multiscale Computational Modeling of Electro-Chemo-Mechanical interactions in Structural Battery electrode materials"
Place: Multi Media Lab (MML), U1.003, Pfaffenwaldring 61, 70569 Stuttgart, Campus Vaihingen
Abstract
The Structural Battery represents an innovative carbon fiber-reinforced polymer composite, designed to serve a dual purpose: As a storage device for electrical energy (viz. as a battery) and as a robust support for mechanical loads. Carbon fibers play a multifaceted role, acting as an active electrode material, current collector, and mechanical reinforcement. These fibers are integrated into a Structural Battery Electrolyte, comprising a solid phase (a porous polymer network) and a liquid electrolyte that facilitates the movement of ions, particularly Li-ions. The ion-mobility is brought about by stress-assisted diffusion (driven by the chemical potential gradient), migration (induced by the electric field), and convection (resulting from fluid motion, i.e., seepage) [1]. In summary, the liquid phase within the porous polymer network promotes ion transport between electrodes, while the solid phase effectively distributes mechanical stresses.
This presentation showcases the capabilities of a recently developed computational two-scale modeling framework, exemplified by [2,3], in evaluating the integrated electro-chemo-mechanical properties of Structural Battery electrode materials. The governing equations of the problem are established upon coupling Gauss law and mass conservation for each mobile species with mechanical (quasi-static) equilibrium. By utilizing Variationally Consistent Homogenization, we are able to establish a two-scale model where both the macro- and the sub-scale equation systems emerge from a single-scale formulation. We explore various couplings and their properties across the scales through numerical assessment of the intricate characteristics of Structural Battery electrode materials.
[1] Carlstedt, D., Runesson, K., Larsson, F., Jänicke, R., & Asp, L. E. (2023). Variationally consistent modeling of a sensor-actuator based on shape-morphing from electro-chemical–mechanical interactions. Journal of the Mechanics and Physics of Solids, 179, 105371.
[2] Rollin, D. R., Larsson, F., Runesson, K., & Jänicke, R. (2023). Upscaling of chemo-mechanical properties of battery electrode material. International Journal of Solids and Structures, 281, 112405.
[3] Tu, V., Larsson, F., Runesson, K., & Jänicke, R. (2023). Variationally consistent homogenization of electrochemical ion transport in a porous structural battery electrolyte. European Journal of Mechanics-A/Solids, 98, 104901.