From Stress to Voltage - Modeling the Hysteresis and Slow Relaxation of Silicon Anodes

Kurzfassung

This talk presents a modeling approach for silicon anodes, focusing on the formation and growth of the solid electrolyte interphase (SEI). We explore the coupled mechanics of the silicon-SEI system, emphasizing how SEI-induced mechanical effects evoke a stress hysteresis. This stress hysteresis, in turn, leads to a voltage hysteresis in the silicon anode. We further examine the long-term voltage relaxation behavior using a thermodynamically consistent continuum modeling framework. References: L. Köbbing, A. Latz , B. Horstmann, J. Power Sources 2023 , 561, 232651. L. Köbbing, A. Latz , B. Horstmann, Adv. Funct . Mater. 2024 , 34, 202308818. L. Köbbing, Y. Kuhn, B. Horstmann, ACS Appl. Mater. Interfaces 2024 , 16 (49), 67609 67619. R. Schoof, L. Köbbing, A. Latz , B. Horstmann, W. Dörfler , Batter. Supercaps 2025 , 8 (5), 202400604.