Method for recovering active metal of lithium secondary battery
AssigneeSK Innovation Co., Ltd.
InventorsHyeon Hui Lee, Ji Yun Park, Young Bin Seo, Seung Ok Lee, Sung Real Son
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Abstract
In a method for recovering an active metal of a lithium secondary battery, a sulfuric acid solution is added to a lithium metal composite oxide so as to prepare a sulfated active material solution. A transition metal is extracted from the sulfated active material solution. A lithium precursor is recovered by adding a lithium extracting agent to the solution remaining after the transition metal has been extracted from the sulfated active material solution. In the method, the amount of impurities is reduced, and sulfuric acid and the neutralizing agent can be recycled so that a high-yield lithium precursor recovery is enabled.
Claims16
A method for recovering an active metal of a lithium secondary battery, the method comprising:
- adding sulfuric acid to a lithium metal composite oxide to prepare a sulfated active material solution;
- extracting a transition metal from the sulfated active material solution, wherein the extracting of the transition metal comprises adding a transition metal extracting agent;
- and
- adding a lithium extracting agent to a residual solution in which the transition metal is extracted from the sulfated active material solution to recover a lithium precursor, wherein an alkali metal sulfate and lithium sulfate are generated from the residual solution by adding the lithium extracting agent;
- converting the alkali metal sulfate generated from the residual solution into a converted sulfuric acid solution and a converted alkali metal hydroxide;
- and
- recycling the converted alkali metal hydroxide to a saponification of the transition metal extracting agent and the lithium extracting agent,
- wherein the transition metal extracting agent and the lithium extracting agent are added in a saponified state by the converted alkali metal hydroxide.
A method for recovering an active metal of a lithium secondary battery, comprising:
- adding sulfuric acid to a lithium metal composite oxide to prepare a sulfated active material solution;
- extracting a transition metal from the sulfated active material solution wherein the extracting of the transition metal comprises adding a transition metal extracting agent;
- recovering lithium hydroxide directly from a residual solution from which the transition metal is extracted from the sulfated active material solution by an electrodialysis;
- and
- recycling a portion of the recovered lithium hydroxide for a saponification of the transition metal extracting agent.
Dependencies are inferred from the claim text.