A method for reducing waste by recovering a lithium precursor including: a) mixing a waste lithium secondary battery positive electrode material with urea to prepare a first mixture; b) firing the first mixture to prepare a second mixture; and c) subjecting the second mixture to water washing to obtain lithium hydroxide.

A method for reducing waste by recovering a lithium precursor including: a) mixing a waste lithium secondary battery positive electrode material with urea to prepare a first mixture; b) firing the first mixture to prepare a second mixture; and c) subjecting the second mixture to water washing to obtain lithium hydroxide.

A process to produce battery grade lithium hydroxide monohydrate with low content of carbonate from an impure lithium feed by forming a concentrated lithium hydroxide solution that is saturated or nearly saturated with lithium hydroxide monohydrate, removing at least some lithium carbonate from the solution, crystallizing the lithium hydroxide monohydrate, and separating the crystallized lithium hydroxide monohydrate from the solution.

A process to produce battery grade lithium hydroxide monohydrate with low content of carbonate from an impure lithium feed by forming a concentrated lithium hydroxide solution that is saturated or nearly saturated with lithium hydroxide monohydrate, removing at least some lithium carbonate from the solution, crystallizing the lithium hydroxide monohydrate, and separating the crystallized lithium hydroxide monohydrate from the solution.

Disclosed is a method for manufacturing lithium hydroxide from a lithium-ion battery waste. The method includes heat-treating the cathode scraps as the lithium-ion battery waste under an NH.sub.3 gas atmosphere to convert lithium incorporated in the cathode scraps into lithium oxide (Li.sub.2O) or lithium hydroxide (LiOH). The lithium is then leached using water, followed by solid/liquid separation to remove solid residues. CaO is added to the filtered leached solution to precipitate impurities, which are removed before passing the solution through ion exchange resin. After evaporation, crystallization is achieved either by adding isopropyl alcohol or using an evaporative crystallizer, yielding high-purity LiOH.Math.H.sub.2O crystals. This process offers an efficient recycling method for lithium-ion batteries with high lithium recovery and purity.

Disclosed is a method for manufacturing lithium hydroxide from a lithium-ion battery waste. The method includes heat-treating the cathode scraps as the lithium-ion battery waste under an NH.sub.3 gas atmosphere to convert lithium incorporated in the cathode scraps into lithium oxide (Li.sub.2O) or lithium hydroxide (LiOH). The lithium is then leached using water, followed by solid/liquid separation to remove solid residues. CaO is added to the filtered leached solution to precipitate impurities, which are removed before passing the solution through ion exchange resin. After evaporation, crystallization is achieved either by adding isopropyl alcohol or using an evaporative crystallizer, yielding high-purity LiOH.Math.H.sub.2O crystals. This process offers an efficient recycling method for lithium-ion batteries with high lithium recovery and purity.

A system for reducing waste by recovering a lithium precursor, the system comprising: a first mixer for mixing a waste lithium secondary battery positive electrode material with urea to prepare a first mixture; an oven for firing the first mixture to prepare a second mixture containing lithium hydroxide; and a second mixer for subjecting the second mixture to water washing to separate a lithium precursor.

A system for reducing waste by recovering a lithium precursor, the system comprising: a first mixer for mixing a waste lithium secondary battery positive electrode material with urea to prepare a first mixture; an oven for firing the first mixture to prepare a second mixture containing lithium hydroxide; and a second mixer for subjecting the second mixture to water washing to separate a lithium precursor.

A method for preparing battery grade and high purity grade lithium hydroxide and lithium carbonate from high-impurity lithium sources includes steps for preparation of a refined lithium salt solution, preparation of battery grade lithium hydroxide, preparation of high purity grade lithium hydroxide, preparation of high purity grade lithium carbonate and preparation of battery grade lithium carbonate. The system to carry out the preparation includes a refined lithium salt solution preparation subsystem, a battery grade lithium hydroxide preparation subsystem, a high purity grade lithium hydroxide preparation subsystem, a high purity grade lithium carbonate preparation subsystem and a battery grade lithium carbonate preparation subsystem arranged in turn according to production sequence. A combination of physical and chemical treatment methods are used to treat the high-impurity lithium sources having variations in lithium contents, impurity categories, and impurity contents.