Method for recovering cobalt lithium metal from waste lithium ion battery of lithium cobalt oxide positive material

Abstract

The invention discloses a method for recovering cobalt lithium metal from a waste lithium ion battery of a lithium cobalt oxide positive material. The method comprises the following steps: discharging and disassembling the waste lithium ion battery to obtain a waste positive plate, roasting the waste positive plate, dissolving with water and filtering to obtain waste lithium cobalt oxide powder; mixing the waste lithium cobalt oxide powder and sodium hydrogen sulfate according to a certain proportion and then roasting; leaching the roasting product with water; adding sodium carbonate solution into the solution and then filtering; supplementing a certain quantity of lithium carbonate into filter residue and then performing ball milling, pressing and placing in a resistance furnace to roast to newly obtain the lithium cobalt oxide positive material with good electrochemical performance, wherein the ingredients of the filter liquor are adjusted by using sulfuric acid and the sodium hydrogen sulfate obtained after the crystallization treatment is performed can be reutilized.

Description

technical field [0001] The invention relates to the technology of recovering cobalt-lithium metal from waste lithium-ion batteries of lithium cobalt oxide cathode material. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries developed rapidly in the 1990s, and are widely used in small portable electronic communication products and electric vehicles. According to statistics, in 2009, the output of lithium-ion batteries in my country reached 1.87 billion, and in 2010, the output of lithium-ion batteries in my country reached 2.68 billion. Since the service life of lithium-ion batteries is generally 2-3 years, the problems of environmental pollution and resource waste caused by discarded lithium-ion batteries have become increasingly prominent. The problem of how to properly dispose of discarded lithium-ion batteries cannot be ignored. The recycling and reuse of resources such as Co, Ni, Mn, Li, Al, and Cu in waste lithium-ion batter...

AI Technical Summary

Problems solved by technology

[0005] Currently reported methods for recovering valuable metals from waste lithium-ion batteries using lithium cobaltate as the positive electrode material use sulfuric acid plus hydrogen peroxide, sodium thiosulfate, hydrochloric acid, and nitric acid to dissolve waste LiCoO 2 , acid gas, Cl 2 or NO x Exhaust gas, the recycling process has caused serious secondary pollution to the environment

In addition, there are many subsequent treatment procedures and long processes for the leaching solution, resulting in high recovery costs; in order to improve the metal recovery rate and shorten the leaching time, the leaching process adopts a higher acid concentration and leaching temperature, which has high requirements for the anti-corrosion of the leaching equipment.

Using waste LiCoO 2 The method of roasting after mixing the powder with alkali metal sodium and potassium salts has the disadvantages of a large amount of alkali metal sodium and potassium salts in the roasting process and a large amount of precipitant oxalate in the recovery process, resulting in high recovery costs; 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