SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 5: Materials in Energy Conversion: Mechanical Properties and Solid State Batteries

MM 5.7: Vortrag

Montag, 27. März 2023, 12:00–12:15, SCH A 215

Design for Dual-Functional Electrode Promoting Dendrite-free and CO2 Utilization Enabled High-Reversible Symmetrical Na-CO2 batteries — •Changfan Xu, Huaping Zhao, and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany

A one stone two-birds strategy is presented by using carbon paper embedded with Ru nanoparticles (RuCP) as dual-functional electrodes for both the Na anode and CO2 cathode. As an anode host, the RuCP with remarkable sodiophilicity can dominate Na nucleation behavior and achieve a uniform Na ion flux for the inhibition of dendrite formation, meanwhile, the RuCP affords high catalytic activity for catalyzing the formation/decomposition of Na2CO3 in CO2 cathode. As a result, the Na was homogeneously deposited on the RuCP anode without Na dendrite formation, showing a high Coulombic efficiency of over 99% and a long cycle lifetime, and the RuCP cathode demonstrates low overpotentials and excellent cycling stability (>300 cycles). Implementation of the RuCP@Na anode and RuCP cathode allows for the construction of a symmetrical Na-CO2 battery with long-duration cyclability because of the dendrite-free sodium morphology and numerous Ru catalytic sites. Such electrodes and battery designs offer an effective method for the tailoring and optimization of sodium metal batteries with high energy density.