In this study, a mixture of trioctylmethyl ammonium oleate and tridecylmethyl ammonium oleate ionic liquids was synthesized and structurally characterized by FT-IR, and MNR spectroscopy. The synthesized ionic liquidr were used as a solvent for the extraction process to recover precious metal ions (Mn2+, Co2+, Ni2+, Li+) in spent batteries. The principle of the process is based on the ionic liquid's ability to adsorb metal ions changes according to environmental conditions. Research results show that the yiled of metal ions Mn2+, Co2+, Ni2+, Li+recovery rearched 97.05%, 96.12%, 99.43%, 98.04%, respectively. Spents ionic liquid can be recovered up to 80%, metal ions recovery efficiency of reused ionic liquid reaches >
95% compared to the first time.