SKM 2023 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: Poster

DS 12.51: Poster

Wednesday, March 29, 2023, 17:00–19:00, P3

Ultrathin alumina membrane: A new opportunity for constructing stable sodium metal anodes — •Jiajia Qiu, Changfan Xu, Huaping Zhao, and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Unstable solid electrolyte interphase (SEI) remains a major bottleneck for sodium metal batteries due to the mossy or dendritic growth of Na in the repetitive stripping/plating process. Recently, nanostructured modification of Na and Al2O3 coatings have been reported as two effective solutions to address this issue. Accordingly, with almost identical pore regularity and precisely controlled geometrical structure, ultrathin alumina membrane (UTAM) is utilized as a functional layer to effectively protect the Na anode of Na-metal batteries for the first time in this work. The mossy or dendritic growth of Na has been suppressed due to the UTAM protection, resulting in a uniform electrodeposition interface. UTAM significantly improved the Coulombic efficiency while avoiding short circuit risks. And it has the potential to be applied to other metal anodes. The novel design of a UTAM-protected metal Na anode may bring in new opportunities for next-generation high performance Na metal batteries.