A method of recovering a cathode active material precursor according to an embodiment of the present invention includes preparing a cathode active material mixture including a lithium composite oxide, separating lithium from the cathode active material mixture to form a preliminary transition metal precursor, acid-treating the preliminary transition metal precursor to form a complex transition metal salt solution, and adding an acidic extractant to the complex transition metal salt solution and then adding a basic compound to recover a transition metal precursor, and thus the extraction rate of transition metals can be improved.

A treatment process for crystallizing a metal sulfate involving pre-treating a feedstock comprising calcium, magnesium, and/or lithium impurities, the pre-treating involving pre-leaching the feedstock in the presence of a lixiviant, selectively extracting a first portion of any of the impurities from the feedstock, and forming a leached solution comprising an uncrystallized metal sulfate and any remaining impurities; and/or refining the leached solution and removing a second portion of any of the remaining impurities; and crystallizing the uncrystallized metal sulfate from the leached solution to form a crystallized metal sulfate. So processed, the crystallized metal sulfate may be battery-grade or electroplating-grade.

Disclosed is a method for anaerobically cracking a power battery, which includes the following steps: disassembling a waste power battery to obtain a battery cell; taking out a diaphragm from the battery cell for later use, and pyrolyzing the battery cell to obtain electrode powder; extracting nickel, cobalt and manganese elements from the electrode powder with an extraction buffer, filtering, taking the filtrate, then adjusting the filtrate with a nickel solution, a cobalt solution and a manganese solution to obtain a solution A, adding the solution A dropwise into ammonium hydroxide under stirring, and then adding an alkali solution under stirring to obtain a solution B; subjecting the solution B to a hydrothermal reaction, filtering, and roasting to obtain a catalyst, such that a chemical formula of the catalyst is Ni.sup.2+.sub.1-x-yCo.sup.2+.sub.xMn.sup.2+.sub.yO, where 0.25≤x<0.45, 0.25≤y<0.45.

A process for removal of aluminium and iron in the recycling of rechargeable batteries comprising providing a leachate from black mass, adding phosphoric acid (H.sub.3PO.sub.4) to said leachate and adjusting the pH to form iron phosphate (FePO.sub.4) and aluminium phosphate (AlPO.sub.4), precipitating and removing the formed FePO.sub.4 and AlPO.sub.4, and forming a filtrate for further recovery of cathode metals, mainly NMC-metals and lithium.

A method for recycling lithium batteries containing the steps: (a) digesting comminuted material (10), which contains comminuted components of electrodes of lithium batteries, using concentrated sulphuric acid (12) at a digestion temperature (T.sub.A) of at least 100° C., in particular at least 140° C., so that waste gas (14) and a digestion material (16) are produced, (b) discharging the waste gas (14) and (c) wet chemical extraction of at least one metallic component of the digestion material (16).

The present invention relates to a method of preparing a precursor material of a positive electrode active material from a waste lithium secondary battery, to a method of preparing a lithium secondary battery positive electrode active material including a precursor material prepared by the same precursor preparation method, and to a lithium secondary battery positive electrode active material prepared by the same positive electrode active material preparation method.

A process for removal of aluminium and iron in the recycling of rechargeable batteries comprising providing a leachate from black mass, adding phosphoric acid (H.sub.3PO.sub.4) to said leachate and adjusting the pH to form iron phosphate (FePO.sub.4) and aluminium phosphate (AlPO.sub.4), precipitating and removing the formed FePO.sub.4 and AlPO.sub.4, and forming a filtrate for further recovery of cathode metals, mainly NMC-metals and lithium.

Disclosed is a method for anaerobically cracking a power battery, which includes the following steps: disassembling a waste power battery to obtain a battery cell; taking out a diaphragm from the battery cell for later use, and pyrolyzing the battery cell to obtain electrode powder; extracting nickel, cobalt and manganese elements from the electrode powder with an extraction buffer, filtering, taking the filtrate, then adjusting the filtrate with a nickel solution, a cobalt solution and a manganese solution to obtain a solution A, adding the solution A dropwise into ammonium hydroxide under stirring, and then adding an alkali solution under stirring to obtain a solution B; subjecting the solution B to a hydrothermal reaction, filtering, and roasting to obtain a catalyst, such that a chemical formula of the catalyst is Ni.sup.2+.sub.1-x-yCo.sup.2+.sub.xMn.sup.2+.sub.yO, where 0.25≤x<0.45, 0.25≤y<0.45.

A process for removal of aluminium and iron in the recycling of rechargeable batteries comprising providing a leachate from black mass, adding phosphoric acid (H.sub.3PO.sub.4) to said leachate and adjusting the pH to form iron phosphate (FePO.sub.4) and aluminium phosphate (AlPO.sub.4), precipitating and removing the formed FePO.sub.4 and AlPO.sub.4, and forming a filtrate for further recovery of cathode metals, mainly NMC-metals and lithium.

The present disclosure discloses a recycling method for a mixed waste material of lithium nickel manganese cobalt oxide (LNMCO) and lithium iron phosphate (LFP), including: conducting acid-leaching to obtain an acid-leaching liquor with nickel, cobalt, manganese, phosphorus, iron, and lithium; conducting adsorption separation with a resin, washing the resin with sulfuric acid to obtain a mixed solution of nickel sulfate, cobalt sulfate, and manganese sulfate, and subjecting the mixed solution to precipitation to obtain an LNMCO cathode material precursor; and subjecting an obtained solution with phosphorus, iron, and lithium to lithium precipitation to obtain a lithium salt precipitate, and subjecting a post-precipitation solution to concentration and electrospinning to obtain a ferric phosphate/carbon material. The process of the present disclosure can achieve comprehensive recycling of a mixed waste material of LNMCO and LFP and the directed circulation of waste LNMCO and LFP materials.