Method for recovering cobalt lithium aluminum from positive pole plate of scrap lithium ion battery

A technology of lithium-ion batteries and positive plates, which is applied in the field of recycling cobalt, lithium and aluminum, can solve the problems of ball mill equipment corrosion, environmental secondary pollution, high roasting temperature, etc., and achieve no secondary pollution, low recycling cost, and low equipment requirements Effect

Active Publication Date: 2014-10-15
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The methods for recovering cobalt-lithium-aluminum from the positive electrode sheet of scrap lithium-ion batteries that have been reported so far still have the problem that the separation cost of aluminum foil, the base material of the positive electrode sheet, and lithium cobalt oxide, the active material of the positive electrode sheet, is high, and the separation process is easy to cause water pollution due to the introduction of organic solvents. Disadvantages: use sulfuric acid plus hydrogen peroxide or sodium thiosulfate, hydrochloric acid or nitric acid to dissolve waste LiCoO 2 , the leaching process will inevitably produce acid gas, Cl 2 or NO x Exha

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014]Put the obtained waste positive electrode sheet into a ceramic crucible according to a certain proportion, and then place it in a box-type resistance furnace to raise the furnace temperature to 550°C at a heating rate of 5°C / min from room temperature and keep it for 1h; take out the baked positive electrode sheet According to the ratio of the mass of the positive electrode sheet to the volume of water (g / ml) of 1:50, put the positive electrode sheet into a container filled with water and stir it with an electric stirrer for 20 minutes. During the stirring process, the temperature of the water is 35°C. The speed is 80r / min; after the stirring is stopped, the mixture in the container is sieved with a 20-mesh sieve, the sieve is aluminum foil, and the sieve is a solution containing positive active substances; Obtain aluminum foil through natural drying; Under the sieve, carry out suction filtration, filter supernatant water wash 1 time, after natural drying again, obtain lit...

Embodiment 2

[0016] Put the obtained waste positive electrode sheet into a ceramic crucible according to a certain proportion, and then place it in a box-type resistance furnace to raise the furnace temperature to 550°C at a heating rate of 5°C / min from room temperature and keep it for 1h; take out the baked positive electrode sheet According to the ratio of the mass of the positive electrode sheet to the volume of water (g / ml) of 1:50, put the positive electrode sheet into a container filled with water and stir it with an electric stirrer for 20 minutes. During the stirring process, the temperature of the water is 35°C. The speed is 80r / min; after the stirring is stopped, the mixture in the container is sieved with a 20-mesh sieve, the sieve is aluminum foil, and the sieve is a solution containing positive active substances; Obtain aluminum foil through natural drying; Under the sieve, carry out suction filtration, filter supernatant water wash 1 time, after natural drying again, obtain li...

Embodiment 3

[0018] Put the obtained waste positive electrode sheet into a ceramic crucible according to a certain proportion, and then place it in a box-type resistance furnace to raise the furnace temperature to 550°C at a heating rate of 5°C / min from room temperature and keep it for 1h; take out the baked positive electrode sheet According to the ratio of the mass of the positive electrode sheet to the volume of water (g / ml) of 1:50, put the positive electrode sheet into a container filled with water and stir it with an electric stirrer for 20 minutes. During the stirring process, the temperature of the water is 35°C. The speed is 80r / min; after the stirring is stopped, the mixture in the container is sieved with a 20-mesh sieve, the sieve is aluminum foil, and the sieve is a solution containing positive active substances; Obtain aluminum foil through natural drying; Under the sieve, carry out suction filtration, filter supernatant water wash 1 time, after natural drying again, obtain li...

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Abstract

The invention discloses a method for recovering cobalt lithium aluminum from the positive pole plate of a scrap lithium ion battery. The method comprises the steps as follows: firstly, discharging and disassembling the scrap lithium ion battery, calcinating the scrap positive pole plate in a chamber electric furnace, and dissolving and filtering with water so as to obtain scrap lithium cobalt oxides powder and aluminum foil; secondly, mixing the scrap lithium cobalt oxides powder and sodium hydrogen sulfate or sodium purosulfate according to a certain proportion, and then placing the mixture in a ball mill for ball milling; thirdly, placing the mixture obtained after the ball milling in the chamber electric furnace for calcinating at low temperature; fourthly, leaching a product obtained after the calcination with water for generating a leaching liquid to be subjected to operations of cobalt sedimentation and lithium sedimentation so as to obtain cobalt oxalate and lithium carbonate.

Description

technical field [0001] The invention relates to the technology of recovering cobalt lithium aluminum. Background technique [0002] Lithium-ion batteries have a series of advantages such as small size, light weight, high energy density, high working voltage, long cycle life and no memory effect, and have been widely used in cameras, mobile phones, notebook computers, cameras, portable measuring instruments, charging In addition, it is also an optional high-energy power source for electric vehicles and energy storage power stations in the future. After the service life of lithium-ion batteries has expired, its subsequent reasonable treatment is an important issue to be solved. [0003] The contents of valuable metals Co, Li, Cu, and Al vary greatly in different parts of lithium-ion batteries, such as shells, tabs, positive electrodes, negative electrodes, etc. At present, the treatment of scrap lithium ions is generally to first dismantle them mechanically or manually to ob...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54C22B7/006
Inventor 王大辉彭勃王耀军文豪
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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