A compact cell for electrochemical investigations of solid-state materials
Year: 2025
Type: article
Abstract: Solid electrolytes are a key feature of all-solid-state batteries, which represent advanced energy storage systems. The investigation of electrochemical properties of promising materials is essential for the development of new compounds. Herein, we report a simple and compact polyether ether ketone (PEEK)-based cell for the analysis of air and moisture sensitive solid electrolytes, including brittle microcrystalline powders or tapes. The cell exhibits low intrinsic capacitance, enabling impedance spectroscopy across the full frequency range without interfering features and applicable for a large temperature range from −70 °C to 80 °C. Controlled fabrication and measurement pressures improve the reproducibility of impedance measurements. Using polytetrafluoroethylene samples of varying thickness, this stray capacitance is measured and determined. Temperature-dependent electrochemical impedance spectroscopy of Li 6 PS 5 Cl/hydrogenated nitrile butadiene rubber (HNBR) sheets, conducted between −70 °C and 80 °C, demonstrates the cell durability and the high reproducibility of impedance measurements. Furthermore, the airtightness and experimental consistency were maintained even after 250 h of operation. Finally, we highlight the importance of low intrinsic capacitance by successfully resolving the bulk and grain contributions in Li 6 PS 5 Cl. • Compact polyether ether ketone-based cell enables airtight impedance spectroscopy of brittle materials. • Low quantified stray capacitance allows full-range impedance analysis. • Temperature-stability from −70 °C to 80 °C for reproducible measurements. • Bulk and grain boundary separation achieved in Li 6 PS 5 Cl separator sheets.
Source: Solid State Ionics
Authors: Samuel Merk, Jan Meyer, David Müller, Thomas F. Fässler
Institutions: TUMint Energy Research, Technical University of Munich
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,560
OpenAlex ID: W7117381864