Method for obtaining cathode active materials from black mass of batteries and apparatus for obtaining cathode active materials to be used in such method

A method for obtaining cathode active materials from black mass, which consists in:

• subjecting said black mass to a leaching operation, by using a leaching agent, thus obtaining a leaching liquor,
• subjecting said leaching liquor to a step of mixing with supercritical water, generating nanoparticle precipitation, thus obtaining a nanoparticle solution of metal oxides,
• subjecting said nanoparticle solution to a step of mixing with a stream of additives and/or cold water to obtain a stoichiometrically correct and/or chemically stable nanoparticle solution,
• cooling said stoichiometrically correct and/or chemically stable nanoparticle solution, thus obtaining cathode active materials and/or precursors of cathode active materials.

An apparatus for obtaining cathode active materials, comprising:

• first pumping means,
• heating means downstream of said first pumping means,
• second pumping means,
• third pumping means,
• fourth pumping means,
• a mixer,
• cooling means,
• a back pressure regulator.