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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; secondly, waste gas, waste residue and acid-base waste liquid are inevitably generated during the recycling process, which is likely to cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Cut the positive electrode current collector obtained after discharging and disassembling the waste lithium cobaltate-lithium ion battery into small slices of 2cm*2cm, and pyrolyze it under nitrogen protection at 500°C for 60 minutes. After vibratory screening, wind selection is carried out on the materials under the screen: the materials fall freely, and air is blown in at its vertical position, the light objects change the running track under the action of wind, while the heavy objects continue to fall, and then the separation is realized.

[0040] The separated waste lithium cobalt oxide materials were dry-milled, the grinding balls were zirconia balls, the mass ratio of balls to materials was 20:1, the rotation speed was 400 rpm, and the time was 2 hours. The average particle size of the waste lithium cobalt oxide material after treatment is reduced, indicating that the effect of ball milling is obvious. After grinding, cyclone sorting is carried out, and the fine p...

Embodiment 2

[0044] The positive electrode material of the waste lithium ion battery treated in this example is the ternary material nickel cobalt lithium manganese oxide, and its battery dismantling, material separation and enrichment, ball milling treatment and battery assembly test are the same as in Example 1. The electrochemical test results of the recycled material (product A, whose particle size is 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). After 100 cycles at 1C, the capacity retention rate reaches 95%, and the cycle performance is good.

[0045] The product B was immersed in a 1.5mol / L lithium hydroxide solution for 10 hours, then dried, and then kept at 500°C for 4 hours; then the temperature was raised to 900°C and held for 20 hours. The activated product B is obtained; during segmental sintering, the atmosphere used is air a...

Embodiment 3

[0048] The positive current collector obtained after discharging and disassembling the waste nickel-cobalt lithium manganese oxide battery was cut into small slices of 2cm*2cm, and pyrolyzed under nitrogen protection at 500°C for 90 minutes. After vibratory screening, the material under the screen is re-selected: the material is placed in a jig, and the sieve plate 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 manganese oxide material was wet-milled, the balls were alumina balls, the mass ratio of balls to materials was 20:1, the speed was 400 rpm, and the ball-milling medium was anhydrous ethanol. , time 3 hours. Dry the ground material in a drying oven at 80° C. for 2 hours, and then perform cyclone separation to remove the fine particles (the fine particles are product B), and then obtain the regenerated positive electrode mate...

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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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