TY  - JOUR
AU  - Rosen, Melanie
AU  - Mahioui, Samir
AU  - Schwab, Christian
AU  - Dück, Gerald
AU  - Finsterbusch, Martin
TI  - Tape Casting of NASICON-Based Separators with High Conductivity for Na All-Solid-State Batteries
JO  - Electrochem
VL  - 6
IS  - 1
SN  - 2673-3293
CY  - Basel
PB  - MDPI
M1  - FZJ-2026-00504
SP  - 5 -
PY  - 2025
AB  - 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.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.3390/electrochem6010005
UR  - https://juser.fz-juelich.de/record/1050780
ER  -