Recovery of Al, Co, Cu, Fe, Mn, and Ni from Spent LIBs after Li Selective Separation by the COOL‐Process. Part 1: Leaching of Solid Residue from COOL‐Process

Lithium recycling from spent LIBs along the COOL‐process produces a Li‐free metal rich black mass, which still contains the entire fraction of valuable metal such as Co, Ni, and Mn. A recycling process was developed, which allows for mobilizing these metals. The first process stage is the selective leaching of Li via COOL‐process. Subsequently, two inorganic (H2SO4 and HCl) and two organics acids (citric and gluconic acid) were tested for mobilizing the metals from the solid residue. To optimize this process stage, acid concentration as well as addition of H2O2 as a reduction reagent were investigated. The optimal conditions to dissolve valuable metals such as Co, Cu, Fe, Mn, and Ni was identified as 2 N H2SO4 and 2 vol % H2O2. An approach for mobilization of metals such as Co, Ni, and Mn from spent LIBs after selective recovery of Li via COOL‐Process was developed. Therefore, 4 different acids were tested and the concentration of the acid and the reducer H2O2 was optimized. The optimal leaching conditions were identified as 2 N H2SO4 and 2 vol % H2O2 at 50 °C and 2 h.