METHOD OF RECOVERING LITHIUM FROM FLY ASHES OR WASTE WATER DERIVED FROM ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY BY USING ELECTROCHEMISTY PROCESS

摘要

The present invention provides a method for collecting lithium from fly ashes or waste water caused in the production process of active materials for a lithium secondary battery using an electrochemical method. The method comprises the steps of: preparing fly ash water or waste water caused in the production process of active materials for a lithium secondary battery (S10); manufacturing lithium manganese oxide by putting a sorbent into the fly ash water or the waste water caused in the production process of the active materials for a lithium secondary battery (S20); manufacturing slurry by stirring after putting the lithium manganese oxide, a conductive material, a binder, and a solvent into a stirrer (S30); coating the manufactured slurry on aluminum foil or copper foil and drying the coated slurry (S40); checking the reactive potential with a cyclic voltammetry after the slurry-coated aluminum foil or copper foil is put into an electrolytic cell containing an electrode plate and lithium metal (S50); depositing the lithium on the surface of the electrode plate by maintaining the electrolytic cell as the checked reactive potential (S60); and separating the lithium deposited on the surface of the electrode plate (S70). [Reference numerals] (AA) START; (BB) END; (S10) Prepare fly ash water or waste water caused in the production process of active materials for a lithium secondary battery; (S20) Manufacture lithium manganese oxide by putting a sorbent into the fly ash water or the waste water caused in the production process of the active materials for a lithium secondary battery; (S30) Manufacture slurry by stirring a stirrer after the lithium manganese oxide, a conductive material, a binder, and a solvent are put into the stirrer; (S40) Dry the manufactured slurry after the manufactured slurry is coated with aluminum foil or copper foil; (S50) check the reactive potential with a cyclic voltammetry after the slurry-coated aluminum foil or copper foil is put into an electrolytic cell containing an electrode plate and lithium metal; (S60) Deposit lithium on the surface of the electrode plate by maintaining the electrolytic cell as the checked reactive potential; (S70) Separate the lithium deposited on the surface of the electrode plate