Regensburg 2022 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 8: Materials for Storage and Conversion of Energy

MM 8.7: Vortrag

Montag, 5. September 2022, 17:30–17:45, H46

Reversible hybrid Na-CO2 batteries with low charging voltage and long-life — •Changfan Xu — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany — School of Metallurgy and Environment, Central South University, Changsha 410083, China — Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China

A reversible and long-life hybrid Na-CO2 battery was proposed by using Na3Zr2Si2PO12 solid electrolyte as a separator, the saturated NaCl solution as an aqueous electrolyte, and nitrogen-rich graphitic carbon framework with well-defined morphology and dense bimetallic Fe-Cu sites (Fe-Cu-N-C) as cathodic catalyst. Besides having high Na+ ion conductivity, Na3Zr2Si2PO12 solid electrolyte also can prevent potential contamination from H2O and CO2 to sodium anode and avoid the internal short-circuit touch of Na dendrite with the cathode, thus improving the battery safety. The aqueous electrolyte can facilitate the dissolution of insulated discharge products, which overwhelmingly improves the reaction kinetics. The Fe-Cu-N-C cathodic catalyst can facilitate the fast evolution and degradation of flocculent discharge products. Finally, the hybrid Na-CO2 battery exhibited an excellent long-term cyclability with up to 1550 cycles (over 600 h). The reaction mechanism of Na-CO2 battery was revealed by in-situ Raman, SEM and XRD analyses.