Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 66: Poster: Nanostructures at Surfaces

O 66.17: Poster

Mittwoch, 20. März 2024, 18:00–20:00, Poster C

Surface engineering via an ultrathin alumina membrane for constructing stable sodium metal anodes — •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

Despite the high theoretical specific capacities (1166 mAh g-1) and low redox potentials (-2.71 V vs. normal hydrogen electrode) of Na metals, unstable solid electrolyte interphase (SEI) remains a major bottleneck due to the mossy or dendritic growth of Na in the repetitive stripping and plating process of sodium metal batteries. Owing to chemical and electrochemical stability during electrochemical plating and stripping, the Al2O3 coatings enable reduced Na dendrite growth. Simultaneously, the ultrathin alumina membrane (UTAM) network 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. As a result, the UTAM network significantly improved Coulombic efficiency while avoiding short-circuit risks. This novel design may bring in new opportunities for next-generation high-performance Na metal batteries.

Keywords: ultrathin alumina membrane; network; nanostructures at surface; metal batteries; dendrite-free