Identifying the Operating Pressure of Pouch-Type Solid-State Batteries
Year: 2026
Type: conference-paper
Abstract: Solid-state batteries (SSBs) are regarded as a successor to current lithium-ion battery technology due to potential gains in energy density and safety. However, most SSB designs require external stack pressure to maintain contact at the solid-to-solid interfaces. While insufficient pressure increases interfacial resistance and diminishes usable capacity, excessive pressure necessitates heavy, costly mechanical constraints that compromise system-level energy density. This work presents a method leveraging a universal testing machine coupled with a potentiostat in a primary-secondary control architecture to systematically explore the pressure-performance relationship in pouch-type sulfide-based SSBs. Pressure sweeps reveal two distinct operating regimes: an initial exponential improvement in cell resistance and discharge capacity at low pressures, followed by a linear saturation phase with increasing pressure. Based on these findings, a quantitative methodology is established to define an optimal operating pressure$(p_{99})$that balances electrochemical performance with mechanical load. The results provide insight into the trade-off between the cell performance and the operating pressure. This approach facilitates standardized pressure optimization, thereby supporting the transition of SSB technology from laboratory-scale research to industrial application.
Institutions: Technical University of Munich, TUMint Energy Research
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7202285248