Method for reclaiming cobalt lithium aluminum from scrapped lithium ion battery cathode sheet

A technology of lithium ion battery and positive electrode sheet, which is applied in the field of recycling cobalt, lithium and aluminum, can solve the problems of corrosion of ball milling equipment, secondary pollution of the environment, and high roasting temperature, and achieves no secondary pollution, low recycling cost, and low equipment requirements. Effect

Active Publication Date: 2016-06-15
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 , acid gas, Cl 2 or NO x Exhaust gas, causing serious secondary pollution to the environment
In addition, the leaching process adopts a higher acid concentration in order to improve the metal recovery rate and shorten the leaching time, which requires high anti-corrosion requirements for the leaching equipment; using the existing roasting technology, there is a high energy consumption in the roasting process due to high roasting temperature Disadvantages; using waste LiCoO 2 Ball milling technology after mixing materials with natural organic acid and hydrogen peroxide, there is a disadvantage that the ball milling equipment is easily corroded and impurities are introduced during the recycling process

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 method for recovering cobalt-lithium-aluminum from the positive electrode sheet of the scrapped lithium ion battery comprises the following steps: discharging and dismantling the spent lithium ion battery, roasting the spent positive electrode sheet in a box-type resistance furnace, dissolving in water, and filtering to obtain waste cobalt acid Lithium powder and aluminum foil, waste lithium cobaltate powder and sodium bisulfate or sodium pyrosulfate are mixed in a certain proportion and then placed in a ball mill for ball milling. The ball-milled mixture is put into a box-type resistance furnace for roasting at low temperature, and the roasted product is leached with water. Cobalt oxalate and lithium carbonate are obtained from the leaching solution through cobalt precipitation and lithium precipitation operations.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 王大辉彭勃王耀军文豪
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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