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Method for regenerating and recovering cathode material of waste lithium ion battery

A technology for lithium-ion batteries and cathode materials, which is applied in the field of regenerating and repairing the cathode materials of waste lithium-ion batteries, which can solve the problems of performance degradation of cathode materials for regenerated lithium-ion batteries, poor product consistency, and burning of sintered materials, so as to prevent secondary pollution , Recycled products have stable quality and good performance

Active Publication Date: 2018-05-01
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

[0004] However, when there are defects such as collapse in the structure of the positive electrode material of the waste lithium-ion battery, the use of conventional heating methods can easily cause the sintered material to be partially burned or burned, resulting in a decrease in the performance of the positive electrode material of the regenerated lithium-ion battery obtained after repair, and poor product consistency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 100g of waste lithium cobaltate battery materials from which the surface organic matter has been removed and place them in a cyclone classifier for processing to obtain granular cathode waste materials with an average particle size of 10 microns. Then be 0.7 to prepare lithium carbonate according to the molar ratio of the lithium element in the lithium carbonate and the cobalt element in the positive electrode waste material, and carry out wet ball milling and mixing the lithium carbonate after the preparation and the positive electrode waste material to obtain a mixture, and the ball milling medium adopts ethanol, Finally, the mixture was placed in a microwave oven with a frequency of 2450 MHz and a power of 500 W, and was heated for 8 minutes in an air atmosphere.

[0031] After natural cooling, the calcined material was used as the positive electrode, metal lithium as the negative electrode, and lithium hexafluorophosphate as the electrolyte, and assembled into a ...

Embodiment 2

[0033] Put 100g of waste lithium cobaltate battery materials from which the surface organic matter has been removed and place them in a cyclone classifier for processing to obtain granular cathode waste materials with an average particle size of 10 microns. Then prepare a lithium hydroxide solution, and control the molar ratio of the lithium element in the lithium hydroxide to the cobalt element in the positive electrode waste material to be 0.6, and immerse the positive electrode waste material in the lithium hydroxide solution for 8 hours, and then dry it at 80°C for 6 hours. hours, the mixture was obtained, and then the mixture was placed in a microwave oven with a frequency of 2450 MHz and a power of 500 W, and was heated for 8 minutes in an air atmosphere.

[0034] After natural cooling, the regenerated materials are assembled into button batteries, and the regenerated lithium cobalt oxide materials can be charged and discharged at 25°C, 0.1C, 3.0-4.3V, and the first disch...

Embodiment 3

[0036] 100 g of the waste nickel-cobalt-manganese-manganese oxide battery material from which the surface organic matter was removed was placed in a cyclone classifier for processing to obtain granular positive electrode waste with an average particle size of 10.5 microns. Then according to the molar ratio of the lithium element in the lithium hydroxide and the nickel, cobalt and manganese in the positive electrode waste material, the total content of the three elements is 0.8 to prepare lithium hydroxide, and the lithium hydroxide after the preparation and the positive electrode waste material are wet-processed. The mixture was uniformly obtained by ball milling, and the ball milling medium was acetone. Finally, the mixture was placed in a microwave oven with a frequency of 2450 MHz and a power of 600 W, and was heated for 5 minutes under an oxygen atmosphere.

[0037] After natural cooling, the calcined material was used as the positive electrode, metal lithium as the negativ...

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Abstract

The invention discloses a method for regenerating and recovering a cathode material of a waste lithium battery. The method comprises the steps of firstly performing graded treatment on cathode materials of waste lithium ion batteries with organic substances on the surfaces thereof disassembled and removed, and removing powdered small particles from the waste lithium ion battery material; then grinding and mixing the waste materials obtained after grading with lithium salt balls in a suitable proportion or immerging the waste materials into a lithium salt solution to obtain a uniformly lithium-mixed waste material; and finally performing heat treatment on the lithium-mixed waste material in an atmosphere of air or oxygen by adopting a microwave sintering method, and regenerating and preparing a lithium ion battery material. As microwave sintering is adopted in the method, the material temperature rise speed is fast and the efficiency is high; furthermore, strong acid and strong alkalineare not required in the whole recovery process, so that no waste slag, no acid wastewater and no alkaline wastewater is generated, and secondary pollution is hard to occur. Meanwhile, the method is simple in process; and the temperature inside the material is more uniform, the quality of the regenerated product is stable and the performances are good during the microwave heating process.

Description

technical field [0001] The invention relates to the field of waste battery recycling, in particular to a method for regenerating and repairing the positive electrode material of waste lithium ion batteries. technical background [0002] Lithium-ion batteries have been widely used in various fields of our lives, bringing great convenience to life. However, Lithium-ion batteries slowly fail over time. An obvious manifestation of lithium-ion battery failure is the reduction in the capacity of the positive electrode material. During the charging and discharging process of lithium ions, lithium ions are continuously intercalated and extracted in the positive electrode material. During the long-term cyclic deintercalation process of lithium ions, the structure of the positive electrode material will change to a certain extent, resulting in the inability of some lithium ions to return to the original structural position of the material, resulting in the loss of lithium and the de...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M10/0525
CPCH01M10/0525H01M10/54Y02E60/10Y02W30/84
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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