SKM 2023 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 42: Interface Controlled Properties and Nanomaterials: Nanoporous Materials and Nanolaminates

MM 42.10: Talk

Thursday, March 30, 2023, 18:15–18:30, SCH A 215

Anode engineering via ultrathin alumina membrane for next-generation stable sodium metal batteries — •Jiajia Qiu, Changfan Xu, Huaping Zhao, and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Sodium metal batteries are recognized as one of the most promising candidates for next-generation batteries, owing to their high theoretical specific capacity and energy density. However, a major bottleneck is the mossy or dendritic growth of Na in the repetitive stripping/plating process with an unstable solid electrolyte interphase (SEI), which limits the Coulombic efficiency and even leads to short circuit risks. In this work, ultrathin alumina membrane (UTAM) is first validated as a functional layer to effectively protect the Na anode for Na-metal batteries. By protecting Na metal with UTAM, the mossy or dendritic growth of Na has been suppressed, resulting in uniform electrodeposition. This highly ordered alumina oxide nanostructure improved electrochemical performance significantly and has the potential to be applied to other metal anodes. The novel design of UTAM protected metal Na anode may bring in new opportunities for next-generation high performance Na metal batteries.