Cycling Data for "Pouch Versus Press Cells – How Cell Configuration Dictates Low-Pressure Performance in Sulfide Solid-State Batteries"

Abstract

This dataset contains electrochemical cycling data of pouch cells, press cells with pellet-type cathode and press-cells with sheet-type cathode. For more information please see the README.txt-file.

Abstract of the underlying text publication: Sulfide-based solid-state batteries (SSBs) offer the potential for higher energy densities compared to state-of-the-art lithium-ion batteries. Although impressive electrochemical performance has already been demonstrated, these results are predominantly obtained under high stack pressures – up to hundreds of MPa. While such conditions are valuable for probing fundamental material properties and intrinsic performance limits, the resulting cell metrics are not easily transferable to practical applications. Consequently, there is a growing imperative for application-oriented evaluation of SSBs under more realistic, low-pressure conditions in the single-digit MPa range. In this study, we demonstrate that the assessment of low-pressure performance can be significantly influenced by the chosen cell architecture. By comparing the cycling performance of sulfide-based SSBs – utilizing an NMC composite cathode and an In/(InLi)x anode with argyrodite-type Li6PS5Cl as electrolyte – in both pouch-cell and presscell configurations, we reveal significant discrepancies in electrochemical performance at stack pressures ranging from 0 MPa to 25 MPa. Notably, the developed pouch cells exhibit vastly superior electrochemical performance at low stack pressures of 1 MPa compared to their press2 cell counterparts despite the same materials used. The dominant failure mechanisms at low stack pressure are investigated using three-electrode pouch cells. Overall, our findings emphasize that a realistic assessment of SSB cell performance requires practical cell architectures that mirror targeted applications.