Acid leaching of LiCoO2 from LIBs: thermodynamic study and reducing agent effect

A.A. MARTINEZ; M.H. RODRIGUEZ; F.M.TUNEZ; E.G.PINNA; D.S. DRAJLIN

REVISTA MEXICANA DE INGENIERIA QUIMICA

UNIV AUTONOMA METROPOLITANA-IZTAPALAPA

Lugar: México D.F.; Año: 2019 vol. 18 p. 441 - 449

1665-2738

This work shows the results of a comparative hydrometallurgical study of LiCoO2 leaching, obtained from the cathodes of spent lithium-ion batteries (LIBs), with HF and HF/H2O2. The operational parameters researched were H2O2 and HF concentrations, solid-liquid ratio, stirring speed, temperature and reaction time. The experimental results indicated that the best working conditions, with dissolution values close to 100%, were 348 K, 330 rpm, 30 min, 8 g/L, HF 0.6 M and H2O2 0.7 M. ThermodynamicstudyofthedissociationofHFinaqueoussolutionandEH-pHdiagramsforLi-H2O,Co-H2OandLi-Co-F-H2O systems were performed. The results showed the feasibility of extracting and recovering metals contained in the sample. Keywords: LiCoO2, LIBs, reducing agent, thermodynamic.