Open Access Article
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Attaining a fast conducting, hybrid solid state separator for all solid-state batteries through a facile wet infiltration method
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Philip Heuer , Lukas Ketter , Moumita Rana , Felix Scharf , Gunther Brunklaus and Wolfgang Zeier
First published on 5th September 2025
Abstract
Thin, fast-conducting and mechanically robust separators are expected to be advantageous in enabling all-solid-state batteries with high energy densities and good electrochemical performance. In this study, a potentially new scalable fabrication route for flexible thiophosphate-polymer separator membranes is demonstrated. By infiltrating a commercially available polymer mesh with the highly conductive inorganic solid ion conductor Li5.5PS4.5Cl1.5, a hybrid separator membrane with a high ionic conductivity is realized. The electrochemical evaluation via rate capability tests reveals superior performance at low stack pressures and high C-rates, when comparing cells employing the hybrid membrane separator, to cells utilizing conventional solid electrolyte separators. As a proof of concept, a full cell implementing the hybrid membrane in between a Si-based anode and a LiNi0.83Co0.11Mn0.06O2-Li5.5PS4.5Cl1.5 composite cathode is evaluated. The experimental work is complemented by resistor network modelling of the hybrid membrane sheets, shedding light on potential challenges in cell operation.