Mechanical modelling approach for the simulation of solid-state electrolytes

Abstract

Various factors are playing a considerable role on the safety performance of battery systems. One major evaluation factor besides electrical, electrochemical, and thermal behavior is the mechanical integrity. The mechanical safety performance is mainly defined by the ability to avoid internal short circuits, initiated due to mechanical loads. For the evaluation of the mechanical safety, the integrity of separators is crucial. This work is focusing mechanical modelling approaches based on an investigation of key-solid-state electrolyte groups. Five different representative solid-state electrolytes were examined on their mechanical integrity. Tensile, bending and compression tests were conducted on polymeric, sulfidic and oxidic solid-state electrolytes. This work addresses the mathematically description and the systematic mechanical simulation of these electrolyte materials. The processing of data using fitting approaches, the mechanical modelling preparation for LS-Dyna, the simulation model build-ups and the simulation results compared to the testing results are introduced. This work lays the foundation as major ingredients for following works in research and development focusing the mechanical safety of solid-state battery cells.