Dresden 2026 – wissenschaftliches Programm
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FM: Fachverband Funktionsmaterialien
FM 5: Focus Session: Holistic structural and safety assessment of battery materials and cells
FM 5.11: Vortrag
Montag, 9. März 2026, 17:45–18:00, BEY/0E40
Sodium Contamination Impact on Performance of Lithium-Ion Battery Cells — •Slaheddine Jabri1, Krum Banov2, Anita Röstek3, Wibke Dempwolf4, Olaf Rienitz3, Petr Novák2, Markus Etzkorn1, and Uta Schlickum1 — 1Institute of Applied Physics Mendelsohnstraße 2, 38106 Braunschweig, Germany — 2Institute of Energy and Process Systems Engineering, Langer Kamp 19b, 38106 Braunschweig, Germany — 3Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany. — 4Institut für Technische Chemie, Hagenring 30, 38106 Braunschweig, Germany
Sodium impurities can enter battery materials through several contamination sources, particularly when NaCl or NaOH are used in the recycling processes. Residual sodium is difficult to eliminate completely, and due to its high solubility, it easily dissolves into the electrolyte, where it may influence the cell performance. In this work, the electrochemical testing of high power NMC881-Graphite cells was studied using LP572 electrolyte containing sodium Na+ impurities with various concentrations. It was found that the discharge capacity decreased drastically and increase of impedance compared to Na+ free electrolyte. The Na+ ion sodium could intercalate between the Graphen layers like Li+ and due to its big ionic radius and higher charge density modify the C-C bonding and lattice parameters. The degradation effects could be found with 3 ppm Na level as impurity in electrolyte.
Keywords: sodium ion Na+; Sodiation/Lithiation; ageing; Graphite