Recovery of Cobalt and Manganese from Spent Lithium-ion Batteries using a Phosphonium-based Ionic Liquid

A novel ionic liquid (IL) trioctyldodecyl phosphonium bis(2,4,4-trimethylpentyl)phosphinate was developed as a recovery agent for cobalt(II) and manganese(II) from spent lithium-ion batteries (LIBs). Absence of organic diluent provides an advantageous factor to IL-based extraction than the conventional one. Co(II) Mn(II) were extracted quantitatively aqueous phase IL phase. Extracted stripped using water NH4NO3, respectively. After stripping, can be reused extractant, facilitating realization continuous process. The hydrophobic shows promise extractant LIBs.