Method for recovering lithium carbonate and nickel-cobalt-manganese mixed metal oxide from waste lithium battery of ternary positive electrode material

Abstract

The invention discloses a method for recovering lithium carbonate and nickel-cobalt-manganese mixed metal oxide from a waste lithium battery of a ternary positive electrode material. The method comprises: splitting a waste lithium battery into a positive electrode sheet, a negative electrode sheet, a diaphragm, an electrode lug and an outer package; heating the positive electrode sheet in air to aset temperature of 350-550 DEG C to enable the positive electrode material to automatically fall off from the positive electrode sheet; separating an Al current collector from the waste positive electrode material, adding water into the waste positive electrode material, performing ball milling to obtain slurry, transferring the slurry into a reaction kettle, introducing CO2 to a certain pressureof 1-50 atm, and reacting at 30-220 DEG C for 1-20 hours; after the reaction is finished, separating a solid and a solution, and evaporating the solution to remove water to obtain lithium carbonate;and drying the separated solid to obtain a nickel-cobalt-manganese mixed metal oxide and carbonate, and roasting the nickel-cobalt-manganese mixed metal oxide and carbonate at high temperature to obtain the nickel-cobalt-manganese mixed metal oxide.

Description

technical field [0001] The invention discloses a method for recovering lithium carbonate and nickel-cobalt-manganese mixed metal oxides from waste lithium batteries of ternary positive electrode materials. The method of the invention uses CO 2 As an extractant, the process of separating lithium from waste ternary cathode materials under pollution-free conditions is realized. Background technique [0002] In recent years, lithium-ion batteries have been widely used as power batteries for vehicles, but power batteries have a certain service life. After the battery life expires, there is a problem of battery scrapping. After the waste batteries are scrapped, in order to eliminate environmental pollution As well as recycling high-value elements in batteries, waste batteries must be recycled. For example, the ternary lithium battery commonly used now contains lithium ions (existing in the electrode material in the form of lithium oxide), cobalt oxide, nickel oxide, manganese oxi...

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Problems solved by technology

[0003] In the battery recycling technologies that have been disclosed or reported, most of the batteries are indiscriminately pulverized together, and then the electrode material and Al current collector are dissolved with strong acid, and then the lithium salt, cobalt salt, nickel salt, and manganese salt are processed. The separate separation of these methods consumes a large amount of acid, and the alkali will produce waste water with high salt load and high acid content, which will pollute the environment. At the same time, the operation process is complicated, the process is cumbersome and the cost is too high

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