%0 Journal Article
%A Rosen, Melanie
%A Mahioui, Samir
%A Schwab, Christian
%A Dück, Gerald
%A Finsterbusch, Martin
%T Tape Casting of NASICON-Based Separators with High Conductivity for Na All-Solid-State Batteries
%J Electrochem
%V 6
%N 1
%@ 2673-3293
%C Basel
%I MDPI
%M FZJ-2026-00504
%P 5 -
%D 2025
%X Sodium–ion batteries are emerging as strong competition to lithium–ion batteries in certain market sections. While these cells do not use critical raw materials, they still feature a liquid electrolyte with all its inherent safety issues, like high flammability and toxicity. Alternative concepts like oxide-ceramic-based all-solid-state batteries feature the highest possible safety while still maintaining competitive electrochemical performance. However, production technologies are still in their infancy, especially for Na all-solid-state batteries, and need to be urgently developed to enable solid-state-battery technology using only abundant raw materials. In this study, the additive-free production of freestanding, undoped NaSICON separators via tape-casting is demonstrated, having an extremely high total Na-ion conductivity of up to 2.44 mS·cm−1 at room temperature. Nevertheless, a strong influence of sample thickness on phase purity as well as electrochemical performance is uncovered. Additionally, the effect of self-coating of NaSICON during high-temperature treatment was evaluated as a function of thickness. While advantageous for increasing the stability against Na-metal anodes, detrimental consequences are identified when separator thickness is reduced to industrially relevant values and mitigation measures are postulated.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.3390/electrochem6010005
%U https://juser.fz-juelich.de/record/1050780