Method for recovering metal from waste lithium ion battery of nickel cobalt lithium manganate cathode material

Abstract

A method for recycling metal from a waste lithium ion battery with Ni-Co lithium manganite positive electrode materials comprises the steps that the waste lithium ion battery is discharged and disassembled or positive electrode leftover materials and positive electrode fragments are collected to obtain a water positive plate, and roasting, water dissolution and filtration are carried out on the waste positive plate to obtain waste Ni-Co lithium manganite powder; the waste Ni-Co lithium manganite powder and sodium hydrogen sulfate are mixed according to a certain proportion and then roasted, a roasted product is obtained through leaching with water, then a sodium carbonate solution is added into the product solution for filtration, carbonate is supplemented, the proportion of Li, Ni, Co and Mn in filter residues is adjusted for conducting ball milling, compressing and roasting on the filter residues, and the Ni-Co lithium manganite positive electrode materials are obtained again; the components of the filtrate are adjusted with sulfuric acid, and sodium hydrogen sulfate obtained after crystallization treatment is carried out can be utilized again.

Description

technical field [0001] The invention relates to a method for recovering metals from waste lithium ion batteries in which nickel-cobalt lithium manganese oxide is used as positive electrode 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 i...

AI Technical Summary

Problems solved by technology

[0005] Sulfuric acid, nitric acid, citric acid, and fluorine-containing organic acids are used to dissolve waste nickel-cobalt lithium manganate in the method for recovering metal from the waste lithium-ion battery that has been reported as positive electrode material. produce acid gas, NO x Exhaust gas and waste water with high acid content and organic content, which have caused serious pollution to the atmospheric environment and water environment

In addition, the dissolution process uses a higher acid concentration and adds hydrogen peroxide, which has high requirements on the anti-corrosion performance of the recycling equipment, which also leads to high recycling costs.