Akademik Veri Yönetim Sistemi
Separation and Purification Technology, cilt.382, 2026 (SCI-Expanded, Scopus)
Deep eutectic solvents (DESs) formulated with organic acids have gained attention for their high reduction potential and environmentally benign characteristics in extracting valuable metals from end-of-life lithium-ion battery (LIB) cathodes. In this study, a eutectic mixture of choline chloride and oxalic acid in an equimolar ratio was utilized to leach nickel, cobalt, and manganese from NMC-based cathode powders. The leaching was conducted at a fixed solid-to-liquid ratio of 1:100 and stirring rate of 375 rpm, under varying thermal and temporal conditions. Transition metals were selectively precipitated using only deionized water, while residual manganese and lithium were further recovered via sodium carbonate addition. The isolated compounds were used to synthesize both NMC532 and LiMn₂O₄ cathode materials. Structural and morphological analysis of the regenerated NMC532 was performed using XRD, SEM-EDS, and HR-TEM; the LMO phase was characterized by XRD. Electrochemical testing demonstrated that the regenerated NMC532 exhibited high capacity retention over 100 cycles and stable impedance characteristics. Notably, the DES retained its extraction capability and demonstrated effective reusability for at least three consecutive cycles, underscoring its potential for sustainable application in LIB recycling.