Method for recovering cobalt and lithium metals in waste lithium-ion battery

Abstract

The invention discloses a method for recovering cobalt and lithium metals from a waste lithium-ion battery. The method comprises the following steps: disassembling the waste lithium-ion battery to obtain a positive plate; cutting the positive plate into small blocks, soaking the small blocks into a separation solution, placing the separation solution with the soaked the positive plate in an ultrasonic environment for a period of time, and taking out an aluminum foil to obtain a mixed solution; carrying out rotary evaporation on the obtained mixed solution to obtain a solid substance, and drying the solid substance to obtain a lithium-ion battery positive electrode material; mixing the positive electrode material with a chelating agent and then carrying out mechanical activation treatment to obtain an activated mixture; and carrying out acid leaching treatment on the obtained activated mixture to obtain an enriched solution containing cobalt and lithium. The operation method is simple,no secondary pollution exists in the recycling process, the cost is low, the industrial production is easy, and the cobalt and lithium metal recycling rate of the positive electrode material of the waste lithium-ion battery can reach 100%.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery recovery, and in particular relates to a recovery method for cobalt and lithium metal in waste lithium ion batteries. Background technique [0002] With the development of technology, batteries have become an indispensable power source for electrical appliances in daily life. Since the 1990s, lithium batteries have replaced wired power supplies and fuel power supplies with their significant advantages such as large capacity, small size, high specific energy, and high operating voltage, and have become the energy and power guarantee for modern technological development. China is the world's largest lithium battery production and manufacturing base. It is estimated that by 2020, the amount of scrapped lithium-ion batteries in my country will reach 32.2GWh. [0003] Lithium-ion batteries are consumables, and they are scrapped after their service life has been reached due to the decline i...

AI Technical Summary

Problems solved by technology

Although this method can recover nickel and cobalt from waste lithium batteries, the operation is complicated and cannot eliminate secondary pollution

Chinese patent (CN104868190A) discloses a method of using reducing agent and organic acid to leach metals in waste lithium-ion battery positive electrode materials. The method utilizes organic acids such as formic acid and reducing agents to improve the metal leaching rate, but the price of formic acid High, and will cause secondary pollution to the water body, and hydrogen peroxide is unstable, a large amount of storage is a safety hazard

Chinese patent (CN102665912A) discloses a method for extracting and recovering cobalt and manganese in the positive electrode material of waste lithium batteries and preparing a Co-Mn-Br liquid phase catalyst (abbreviated as CMB catalyst). Although the method can recover cobalt and manganese, the process Complicated and consumes a large amount of organic solvents, and the recycling of organic solvents cannot be realized

[0005] At present, in most of the published patents and researches, most of the recycling methods for waste lithium-ion battery cathode materials are complicated to operate or the use of reagents will cause secondary pollution

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