Method of recovering lithium from batteries
First Claim
1. A method of recovering lithium from a lithium ion secondary battery having a cathodic active material containing lithium, comprising the steps of:
- dissolving the cathodic active material into mineral acid to obtain an acid solution containing lithium;
adding an alkaline material to the acid solution to obtain a resultant solution;
drying the resultant solution to produce a dried solid;
dissolving the dried solid into a non-aqueous solvent to obtain a non-aqueous solution; and
recovering lithium from the non-aqueous solution.
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Accused Products
Abstract
Disclosed is a method of recovering lithium from a battery containing lithium such as a lithium ion secondary battery. The lithium-containing member of the battery is dissolved with an acidic liquid, and an alkaline material is added to the obtained lithium solution to transform a transition metal which may be dissolved in the lithium solution into a metal hydroxide precipitation, whereby the metal hydroxide precipitate is separated from the lithium solution. The lithium solution is then dried to obtain a solid containing the lithium, and the lithium is eluted from the solid with a non-aqueous solvent. Retrieving lithium from the lithium eluate is accomplished by use of a cation exchanger.
18 Citations
20 Claims
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1. A method of recovering lithium from a lithium ion secondary battery having a cathodic active material containing lithium, comprising the steps of:
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dissolving the cathodic active material into mineral acid to obtain an acid solution containing lithium; adding an alkaline material to the acid solution to obtain a resultant solution; drying the resultant solution to produce a dried solid; dissolving the dried solid into a non-aqueous solvent to obtain a non-aqueous solution; and recovering lithium from the non-aqueous solution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of recovering lithium from a battery having a member containing lithium, comprising the steps of:
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dissolving the lithium of said member with an acidic liquid to obtain a lithium solution; adding an alkaline material to the lithium solution to transform a transition metal which may be dissolved in the lithium solution into a metal hydroxide precipitation, whereby the metal hydroxide precipitation is separated from the lithium solution; drying the lithium solution after the adding step to obtain a solid containing the lithium; eluting the lithium from the solid with a non-aqueous solvent to obtain a lithium eluate; and retrieving the lithium from the lithium eluate.
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11. A method of recovering lithium from a battery having a member containing lithium, comprising the steps of:
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dissolving the lithium of said member with an acidic liquid to obtain a lithium solution; adding an alkaline material to the lithium solution; removing, if a precipitation is produced in the lithium solution at the adding step, said precipitation from the lithium solution; drying the lithium solution after the removing step to obtain a solid containing the lithium; eluting the lithium from the solid with a non-aqueous solvent to obtain a lithium eluate; and retrieving the lithium from the lithium eluate. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification