Method for recycling metal in waste LiMn1-x-yNixCoyO2 battery and preparing LiMn1-x-yNixCoyO2

Abstract

A method for recycling metal in a waste LiMn1-x-yNixCoyO2 battery and preparing LiMn1-x-yNixCoyO2 comprises the steps that a waste lithium ion battery is discharged and dismantled, or positive electrode leftover materials and positive electrode fragments are collected, and waste positive plates are obtained; waste LiMn1-x-yNixCoyO2 powder is obtained through the calcinations, water dissolution and the filtration of the waste positive plates; the waste LiMn1-x-yNixCoyO2 powder and potassium pyrosulfate are mixed according to a certain proportion and calcinated, the calcinated products are leached by water, a potassium carbonate solution is added into the solution, then the filtration is carried out, the proportion of Li, Ni, Co and Mn in filter residues is adjusted by supplying carbonate, ball-milling, compressing and the calcinating are carried out on the Li, the Ni, the Co and the Mn, and LiMn1-x-yNixCoyO2 positive materials are regained. Composition adjustment is carried out on filtrate with sulfuric acid, and potassium hydrogen sulfate is obtained after the crystallization treatment is carried out.

Description

technical field [0001] The invention relates to a technology for recovering metal from waste nickel-cobalt lithium manganate batteries and preparing nickel-cobalt lithium manganese oxide. 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 lit...

AI Technical Summary

Problems solved by technology

[0005] In the currently reported method for recovering metal from waste nickel-cobalt lithium manganate batteries and preparing lithium nickel-cobalt manganese oxide, sulfuric acid, nitric acid, citric acid, and fluorine-containing organic acids are used to dissolve waste nickel-cobalt lithium manganese oxide. 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 leaching equipment and leads to an increase in the cost of recovery.