In a method for producing a coated active material, a coating layer containing niobium is formed on at least a part of a surface of an active material. The method includes: transforming a slurry containing the active material and a coating solution containing niobium into droplets to obtain slurry droplets; drying the slurry droplets in a heated gas stream to obtain a precursor; and baking the precursor. The active material that is used to obtain the slurry droplets contains less than 0.68 wt% of sulfur as an impurity.

The present invention relates to a method of preparing a positive electrode active material for a lithium secondary battery and the positive electrode active material for the lithium secondary battery prepared thereby, and more specifically, to a method of preparing a positive electrode active material for a lithium secondary battery, the method comprising doping or coating the positive electrode active material for the lithium secondary battery with a predetermined metal oxide, and the positive electrode active material for the lithium secondary battery which is prepared thereby and has a reduced amount of residual lithium.

The present invention relates to a method of preparing a positive electrode active material for a lithium secondary battery and the positive electrode active material for the lithium secondary battery prepared thereby, and more specifically, to a method of preparing a positive electrode active material for a lithium secondary battery, the method comprising doping or coating the positive electrode active material for the lithium secondary battery with a predetermined metal oxide, and the positive electrode active material for the lithium secondary battery which is prepared thereby and has a reduced amount of residual lithium.

A hydrometallurgical process is described that can isolate and recover NIMH battery constituents in high-value form: the nickel and cobalt hydroxides (cathode) as nickel and cobalt hydroxides; elemental nickel and cobalt (metallic anode) as nickel and cobalt hydroxides; rare earth metals (metallic anode) as oxides of rare earth metals, conductive carbon (electrodes) as conductive carbon, and the magnetic nickel-plated steel grids (electrodes) and battery cases in a relatively clean and directly smeltable form. The isolation portion of the process isolates the rare earth metals in oxide form from the nickel hydroxide and the cobalt hydroxide. If present, titanium, aluminum, and yttrium are isolated as oxides with the rare earth metal oxides.

A hydrometallurgical process is described that can isolate and recover NIMH battery constituents in high-value form: the nickel and cobalt hydroxides (cathode) as nickel and cobalt hydroxides; elemental nickel and cobalt (metallic anode) as nickel and cobalt hydroxides; rare earth metals (metallic anode) as oxides of rare earth metals, conductive carbon (electrodes) as conductive carbon, and the magnetic nickel-plated steel grids (electrodes) and battery cases in a relatively clean and directly smeltable form. The isolation portion of the process isolates the rare earth metals in oxide form from the nickel hydroxide and the cobalt hydroxide. If present, titanium, aluminum, and yttrium are isolated as oxides with the rare earth metal oxides.

The present disclosure belongs to the technical field of lithium battery recycling, and discloses a method for separating and recovering valuable metals from waste ternary lithium batteries. The method includes the following steps: adding a persulfate to a waste ternary lithium battery powder, and conducting oxidative acid leaching to obtain a leaching liquor and a leaching residue; adding an alkali to the leaching liquor to allow a precipitation reaction; adding a sulfide salt to allow a reaction; adjusting a pH to allow a precipitation reaction to obtain a nickel hydroxide precipitate and a liquid phase A; adding a carbonate to the liquid phase A to allow a reaction, and conducting solid-liquid separation (SLS) to obtain lithium carbonate; and subjecting the leaching residue to calcination, adding a chlorate, heating a resulting mixture, and conducting SLS to obtain manganese dioxide.

The present disclosure belongs to the technical field of lithium battery recycling, and discloses a method for separating and recovering valuable metals from waste ternary lithium batteries. The method includes the following steps: adding a persulfate to a waste ternary lithium battery powder, and conducting oxidative acid leaching to obtain a leaching liquor and a leaching residue; adding an alkali to the leaching liquor to allow a precipitation reaction; adding a sulfide salt to allow a reaction; adjusting a pH to allow a precipitation reaction to obtain a nickel hydroxide precipitate and a liquid phase A; adding a carbonate to the liquid phase A to allow a reaction, and conducting solid-liquid separation (SLS) to obtain lithium carbonate; and subjecting the leaching residue to calcination, adding a chlorate, heating a resulting mixture, and conducting SLS to obtain manganese dioxide.

Disclosed herein is a process for precipitating a mixed hydroxide of TM where TM includes Ni, at least one of Co and Mn, and, optionally, one of Al, Mg, Zr or Ti from an aqueous solution of salts of such transition metals or of Al or of Mg. The process is carried out in a stirred vessel and includes the step of introducing a 10 to 40% by weight aqueous solution of ammonia and an aqueous solution of transition metal salts through at least two inlets into the stirred vessel. An aqueous solution of alkali metal hydroxide is added separately from the at least two inlets.

Disclosed herein is a process for precipitating a mixed hydroxide of TM where TM includes Ni, at least one of Co and Mn, and, optionally, one of Al, Mg, Zr or Ti from an aqueous solution of salts of such transition metals or of Al or of Mg. The process is carried out in a stirred vessel and includes the step of introducing a 10 to 40% by weight aqueous solution of ammonia and an aqueous solution of transition metal salts through at least two inlets into the stirred vessel. An aqueous solution of alkali metal hydroxide is added separately from the at least two inlets.

Embodiments of this application provide a ternary precursor material, a preparation method thereof, and a positive electrode active substance. A ternary precursor material may be provided in this application and may include a core and a shell, wherein (1) the core may have a molecular formula of Ni.sub.xCo.sub.yMn.sub.1-x-y(OH).sub.2±a, where 0.8≤x<1.0, 0<y<0.2, and 0<a<0.2; and the shell may include a doping element; and (2) a deformation stacking fault probability f.sub.D of the ternary precursor material may be ≤4%. With use of the positive electrode active substance prepared by sintering the precursor material, secondary batteries have relatively high gram capacity and cycling performance.