Dresden 2026 – wissenschaftliches Programm

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FM: Fachverband Funktionsmaterialien

FM 5: Focus Session: Holistic structural and safety assessment of battery materials and cells

FM 5.1: Vortrag

Montag, 9. März 2026, 15:00–15:15, BEY/0E40

Hot-pressing enhances mechanical strength of PEO solid polymer electrolyte for all-solid-state sodium metal batteries — •Lanqing Zhao^1,2, Huaping Zhao¹, Feng Liang², and Yong Lei¹ — ¹Institut für Physik & IMN MacroNano* (ZIK), Technische Universität Ilmenau, 98693, Ilmenau, Germany — ²Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, 650093, Kunming, China

A PEO-based composite polymer electrolyte (CPE) was successfully prepared using an emerging solvent-free hot-pressing method, with Na3Zr2Si2PO12 (NZSP) and NaClO4 incorporated to improve ionic conductivity. Benefiting from its good mechanical strength and interfacial contact with the electrodes, the Na||Na3V2(PO4)3@C all-solid-state sodium metal battery (ASSSMB) delivers a high-capacity retention of 97.1% after 100 cycles at 0.5 C and 60 °C. Furthermore, the ASSSMB with an electrolyte thickness of approximately 20 μm also demonstrates excellent cycling stability. This study provides a promising strategy for designing stable polymer-ceramic composite electrolytes through hot-pressing to realize high-energy-density sodium metal batteries.

Keywords: composite polymer electrolyte; ionic conductivity; mechanical strength; hot-pressing; sodium metal battery