Method for regenerating positive electrode active material in LiNi1/3Co1/3Mn1/3O2 waste lithium ion battery

Abstract

The invention discloses a method for regenerating a positive electrode active material in a LiNi1 / 3Co1 / 3Mn1 / 3O2 waste lithium ion battery. The method includes the steps that the waste lithium ion battery is subjected to discharging and dismantling or positive pole leftover materials and positive electrode fragments are collected to obtain waste positive plates, and the waste positive plates are subjected to roasting, water dissolving and filtering to obtain waste LiNi1 / 3Co1 / 3Mn1 / 3O2 powder; the waste LiNi1 / 3Co1 / 3Mn1 / 3O2 powder and sodium pyrosulfate are roasted after being mixed according to a certain proportion, roasted products are leached by water, then a sodium carbonate solution is added into liquor, filtering is conducted, after the proportion of Li, Ni, Co and Mn in carbonate modulation filter residues is supplemented, the Li, Ni, Co and Mn are subjected to ball milling, compressing and roasting, and accordingly the LiNi1 / 3Co1 / 3Mn1 / 3O2 positive electrode material is obtained again. Components of filter liquor are adjusted through sulfuric acid, crystallization processing is carried out, and then sodium hydrogen sulfate is obtained.

Description

technical field [0001] The invention relates to the regeneration technology of positive electrode active materials in nickel-cobalt lithium manganese oxide waste lithium ion batteries. 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 lithiu...

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 regeneration method of the positive active material in the lithium-ion battery of lithium-nickel-cobalt-manganate that has been reported so far. 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 increases the cost of recovery.

The subsequent treatment process after the dissolution of waste nickel cobalt lithium manganese oxide is relatively long, which also leads to high recycling costs