Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 107: Nanostructured Surfaces and Thin Films

O 107.7: Talk

Friday, March 22, 2024, 12:00–12:15, MA 042

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

Considerable growth in portable electronics and electric vehicles has stimulated the urgent demand for new battery systems. Owing to the high theoretical specific capacities (1166 mAh g-1) and low redox potentials (-2.71 V vs. a normal hydrogen electrode) of Na metals, Na metal batteries have attracted high research attention. But its large volume change and dendrite growth lead to low Coulombic efficiency, limited cyclability, and even a safety risk for high-energy-density Na metal batteries. Owing to chemical and electrochemical stability, Al2O3 coatings enable reduced Na dendrite growth, resulting in performance improvement. Simultaneously, a highly ordered ultrathin alumina membrane (UTAM) can change the traditional nucleation and growth modes from the origin, which can provide a porous 3D host to accommodate the large volume change of the Na anode. This novel nanostructure surface engineering via UTAM may bring in new opportunities for next-generation dendrite-free Na metal batteries.

Keywords: ultrathin alumina membrane; nanostructured thin film; anode; metal batteries; dendrite-free