07.05.2025 • Forschung

Identification of Electrolyte Salts in Lithium-Ion Battery Black Mass

Based on ion chromatographic and thermal analyses, it was demonstrated that the assumption that the presence of PF6– ions in lithium-ion battery (LIB) black mass is due to LiPF6 residues is incorrect.

Autor: Martin Bertau, Saxonian Academy of Sciences, Leipzig

In the industrial samples investigated, PF₆^–-containing residues were present in the case of low temperature-pretreated LIB black mass. Based on thermal analysis, a significant proportion of the PF₆^– species was found to originate from NaPF₆. The presence of NaPF₆ is due to the use of tap water in the commercial workup process. Due to the transformation of the PF₆^– species and the associated changes in degradation and hydrolysis behavior, appropriate recycling routes need to be adapted regarding the handling of the conducting salt.

DOI: 10.1002/cite.202400121

IFAT Munich

Wasser – Technik für Kreislaufführung und Ressourcenschutz

Die IFAT Munich vom 4. bis 7. Mai 2026 rückt unter dem Motto „Circularity is a must“ die strategische Bedeutung zirkulärer Ansätze in den Mittelpunkt.

Lebensmitteltechnik

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