Method for reclaiming cobalt lithium aluminum from scrapped lithium ion battery cathode sheet

Abstract

The method for recovering cobalt-lithium-aluminum from the positive electrode sheet of the scrapped lithium ion battery comprises the following steps: discharging and dismantling the spent lithium ion battery, roasting the spent positive electrode sheet in a box-type resistance furnace, dissolving in water, and filtering to obtain waste cobalt acid Lithium powder and aluminum foil, waste lithium cobaltate powder and sodium bisulfate or sodium pyrosulfate are mixed in a certain proportion and then placed in a ball mill for ball milling. The ball-milled mixture is put into a box-type resistance furnace for roasting at low temperature, and the roasted product is leached with water. Cobalt oxalate and lithium carbonate are obtained from the leaching solution through cobalt precipitation and lithium precipitation operations.

Description

technical field [0001] The invention relates to the technology of recovering cobalt lithium aluminum. Background technique [0002] Lithium-ion batteries have a series of advantages such as small size, light weight, high energy density, high working voltage, long cycle life and no memory effect, and have been widely used in cameras, mobile phones, notebook computers, cameras, portable measuring instruments, charging In addition, it is also an optional high-energy power source for electric vehicles and energy storage power stations in the future. After the service life of lithium-ion batteries has expired, its subsequent reasonable treatment is an important issue to be solved. [0003] The contents of valuable metals Co, Li, Cu, and Al vary greatly in different parts of lithium-ion batteries, such as shells, tabs, positive electrodes, negative electrodes, etc. At present, the treatment of scrap lithium ions is generally to first dismantle them mechanically or manually to ob...

AI Technical Summary

Problems solved by technology

[0004] The methods for recovering cobalt-lithium-aluminum from the positive electrode sheet of scrap lithium-ion batteries that have been reported so far still have the problem that the separation cost of aluminum foil, the base material of the positive electrode sheet, and lithium cobalt oxide, the active material of the positive electrode sheet, is high, and the separation process is easy to cause water pollution due to the introduction of organic solvents. Disadvantages: use sulfuric acid plus hydrogen peroxide or sodium thiosulfate, hydrochloric acid or nitric acid to dissolve waste LiCoO 2 , acid gas, Cl 2 or NO x Exhaust gas, causing serious secondary pollution to the environment

In addition, the leaching process adopts a higher acid concentration in order to improve the metal recovery rate and shorten the leaching time, which requires high anti-corrosion requirements for the leaching equipment; using the existing roasting technology, there is a high energy consumption in the roasting process due to high roasting temperature Disadvantages; using waste LiCoO 2 Ball milling technology after mixing materials with natural organic acid and hydrogen peroxide, there is a disadvantage that the ball milling equipment is easily corroded and impurities are introduced during the recycling process