Modeling Large Mechanical Deformations in Solid-State Batteries

作者：Anudeep Mallarapu, Nathaniel Sunderlin, Avtar Singh, Dylan Hamilton, Chuanbo Yang, Kandler Smith, Donal P. Finegan · 发表于：ECS Meeting Abstracts · 年份：2024 · DOI：10.1149/ma2024-022318mtgabs

Interest in all solid-state batteries has been rising due to their potentially safe operation across a wider temperature range and absence of flammable organic solvents. Solid electrolytes are thermally stable up to very high temperatures but their abuse tolerance towards mechanical failure has been debated[1]. It has been reported that thermal runaway kinetics in all solid-state batteries with lithium metal anode can be much faster than conventional lithium-ion batteries[2]. For electric vehicle applications, one of the main failure modes is mechanical abuse during an automotive crash. Deformation and fracture in batteries depend on mechanical properties of materials like active materials, electrolyte, and current collectors. Solid electrolytes can contribute significantly to the mechanical integrity of all solid-state batteries playing an important role in deformation at cell-level. For safety characterization, it is important to understand the deformation thresholds on solid state batteries leading to internal short circuits and compare them to conventional lithium-ion batteries. We develop a finite element microstructure RVE (Representative Volume Element) model to simulate mechanical deformation in solid state batteries to investigate how cell-level mechanical abuse conditions relate to particle-level deformation. We use a cell-level finite element model using representative sandwich (RS) approach to simulate mechanical indentation by a spherical indenter. The RVE model ...