Waste lithium ion battery positive electrode material regeneration method

A lithium-ion battery and positive electrode material technology, which is applied in the field of regeneration of waste lithium-ion battery positive electrode materials, can solve the problems of inevitable waste gas, waste residue and acid-alkaline waste liquid, large investment in equipment, and long process flow, etc., to achieve superiority Excellent electrical performance, high regeneration efficiency, and strong controllability

Active Publication Date: 2018-06-19
广西埃索凯循环科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the process of extracting valuable metals through strong chemical reactions is long and requires a large amount of equipment investment; secon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] Example 1

[0039] The anode current collector obtained after discharging and disassembling the waste lithium cobalt oxide-lithium ion battery is cut into small pieces of 2cm*2cm, and pyrolyzed under nitrogen protection and 500°C for 60 minutes. After vibrating screening, the materials under the screen are subjected to winnowing treatment: the materials fall freely, and air is blown into the vertical position. The light objects change their trajectory under the action of wind, while the heavy objects continue to fall to achieve separation.

[0040] The separated waste lithium cobalt oxide material is subjected to dry grinding treatment, the grinding balls are zirconia balls, the ball-to-material mass ratio is 20:1, the speed is 400 revolutions / min, and the time is 2 hours. The average particle size of the treated waste lithium cobalt oxide material is reduced, indicating that the ball milling effect is obvious. After the grinding is carried out cyclone sorting, the fine par...

Example Embodiment

[0043] Example 2

[0044] The anode material of the waste lithium ion battery processed in this embodiment is a ternary material of lithium nickel cobalt manganate, and the battery disassembly, material separation and enrichment, ball milling treatment and battery assembly test are the same as those of the first embodiment. The electrochemical test results of the recycled material (product A with a particle size of 10.01-12 microns) show that the discharge capacity of the recycled material can reach 153mAh·g under the conditions of 2.7-4.3V and different rates. -1 (0.1C), 143mAh·g -1 (1C), 138mAh·g -1 (2C). The capacity retention rate reaches 95% after 100 cycles under 1C condition, and the cycle performance is good.

[0045] Product B was immersed in a 1.5 mol / L lithium hydroxide solution, dried after 10 hours of immersion, and then first kept at 500°C for 4 hours; then heated to 900°C for 20 hours. The activated product B is obtained; the atmosphere used in the staged sintering ...

Example Embodiment

[0047] Example 3

[0048] The anode current collector obtained after discharging and disassembling the waste nickel-cobalt-manganese oxide battery is cut into small pieces of 2cm*2cm, and pyrolyzed under nitrogen protection and 500°C for 90 minutes. After vibrating screening, the material under the screen is reselected: the material is placed on a jig, and the screen moves up and down to make the material loose. The aluminum foil and the material are sorted due to the difference in particle size and density.

[0049] The separated waste nickel cobalt lithium manganate material is subjected to wet grinding treatment, the grinding balls are alumina balls, the ball-to-material mass ratio is 20:1, the speed is 400 revolutions / min, and the ball milling medium is absolute ethanol. , Time 3 hours. After the ground material is dried in a drying oven at 80°C for 2 hours, it is subjected to cyclone sorting to remove the fine particles (the fine particles are the product B), and then the reg...

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PUM

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Abstract

The invention discloses a waste lithium ion battery positive electrode material regeneration method, which comprises: discharging and disassembling a waste lithium ion battery to obtain a positive electrode current collector, shearing the positive electrode current collector into small thin sheets, and carrying out pyrolysis; separating the aluminum foil from the active substance by using a physical method; carrying out ball milling treatment on the waste positive electrode active substance, wherein the damaged part on the surface of the waste lithium ion battery positive electrode material can be stripped off through the ball milling so as to directly obtain the undamaged material, and the surface properties of the waste lithium ion battery positive electrode material with different damage degree can be converged so as to reduce the differences between the materials; after the ball milling grading, immersing the material in lithium hydroxide aqueous solution; and calcining to obtain the regenerated material. According to the present invention, the positive electrode material is regenerated by using the ball milling method, such that the method is simple, economic and effective, and has strong operability.

Description

technical field [0001] The invention relates to the field of recycling waste batteries, in particular to a method for regenerating positive electrode materials of waste lithium ion batteries. technical background [0002] Lithium-ion secondary batteries are widely used in our lives because of their small size, good cycle performance, and high energy density. However, as the use of lithium-ion batteries increases, the number of spent lithium-ion batteries continues to increase. There are a lot of scarce metal resources, such as nickel, cobalt and lithium, in the positive electrode materials of waste lithium-ion batteries. At the same time, since nickel and cobalt are toxic elements, if they are not effectively disposed of, they will easily endanger the environment. Therefore, the recycling of waste lithium-ion battery cathode materials can not only alleviate the shortage of resources, but also eliminate environmental pollution, which has both economic and social benefits. ...

Claims

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Application Information

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IPC IPC(8): H01M10/54
Inventor 杨越孙伟胡岳华纪效波宋绍乐
Owner 广西埃索凯循环科技有限公司
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