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Porosity characterisation of solid-state battery electrolyte with terahertz time-domain spectroscopy

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number234050
<mark>Journal publication date</mark>1/03/2024
<mark>Journal</mark>Journal of Power Sources
Publication StatusPublished
Early online date13/01/24
<mark>Original language</mark>English


With a growing interest on inorganic ceramics based solid-state electrolytes for all-solid-state batteries, there is a need to maximise their density to optimise electrochemical performance and fuel impermeability. In this paper, we demonstrate the sensitivity of terahertz time-domain spectroscopy (THz-TDS) combined with effective medium theory to quantify the porosity or density of sodium superionic conductor (NaSICON)-based solid-state electrolyte (SSEs) pellets prepared at densities in the range of 2.2–2.9 g cm−3, corresponding to 50–90 % relative densities sintered at 900–1150 °C. The results of which, have been validated against complementary Archimedes analysis and mercury porosimetry highlighting the potential of THz-TDS for rapid, contactless, non-destructive electrolyte characterisation.