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Method and system for recycling and preparing composite positive electrode materials from leftover waste and defective products

A technology of composite cathode material and corner waste, applied in the field of lithium battery recycling, can solve the problems of poor material stability and consistency, bacterial culture, harsh use conditions, and powder that cannot be directly reused, and achieves a mild heat treatment process. Controllable, eliminate secondary environmental pollution, excellent capacity retention rate

Active Publication Date: 2021-10-26
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in the process technology of alkali dissolution-acid leaching-extraction of nickel, cobalt and manganese, although the extraction efficiency of the solvent extraction method is high and the product purity is high, the organic solvent is more or less dissolved and volatile and pollutes the environment, causing secondary Pollution, and the cost of the extraction method is relatively high, and there are limitations in industrial production
Another example is that due to the similar potential of nickel and cobalt, nickel and cobalt will be deposited synchronously in the electrodeposition technology to form a cobalt-nickel alloy, which will affect the subsequent purification and restrict the expanded application.
Other methods such as ion exchange method, sulfide bacteria leaching, etc. have successfully recovered valuable metal elements, but these methods have certain limitations, such as ion exchange method is more complicated to operate, the steps are more cumbersome, and it is only suitable for the separation and purification of a small amount of ions ; Factors such as the cultivation of sulfur bacteria leaching technology bacteria, harsh conditions of use, and difficulty in industrialization have restricted the application and promotion of the technology
Moreover, the existing waste battery recycling process is basically to precipitate or extract nickel, cobalt and manganese, and then purify the lithium-containing solution, which consumes a lot of acid and alkali and has a lengthy process. The product is the primary raw material for the synthesis of positive electrode materials.
Furthermore, the positive electrode powder recovered by traditional dry method contains a little metal impurities or the original material structure is destroyed during the recovery process. The recovered powder cannot be directly reused or the stability and consistency of the material after simple modification Poor performance restricts recycling

Method used

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  • Method and system for recycling and preparing composite positive electrode materials from leftover waste and defective products
  • Method and system for recycling and preparing composite positive electrode materials from leftover waste and defective products
  • Method and system for recycling and preparing composite positive electrode materials from leftover waste and defective products

Examples

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Effect test

Embodiment 1

[0075] A certain type of waste ternary lithium battery scraps are used as raw materials. Firstly, cut the waste scraps into 0.5x0.5cm chips of 2kg, put them into the pyrolysis kiln and heat them at 650°C for 10 minutes, take them out while they are still hot, and directly add them to ice water to cool them down from 650°C to 30°C instantly. Ultrasonic vibration treatment was performed for 20 minutes to peel off the positive electrode material and the aluminum foil, and the aluminum foil and black powder were filtered with a large-pore sieve to obtain an aluminum foil with a smooth surface. The black powder is filtered to remove moisture, dried at 50° C., and then sieved for a second time to filter out metal debris; a carbon-containing positive electrode powder is obtained. The carbon-containing powder is fired in an air atmosphere at a temperature of 850°C for 0.5h. Sampling and weighing, adding excess 5% and 8% lithium salt and titanium dioxide respectively, ball milling and...

Embodiment 2

[0078]A certain type of waste ternary lithium battery scraps are used as raw materials. Firstly, cut the waste scraps into 0.2x0.2cm scraps of 1.2kg, put them into the pyrolysis furnace and heat them at 400°C for 6 hours, then take them out while they are hot and add them to ice water to cool them down instantly from 550°C to 20°C. At the same time, the ultrasonic vibration treatment was performed for 15 minutes to peel off the positive electrode material and the aluminum foil, and the aluminum foil and the black powder were filtered with a large-pore sieve to obtain an aluminum foil with a smooth surface. The black powder is filtered to remove moisture, dried at 80° C., and then sieved for a second time to filter out metal debris; a carbon-containing positive electrode powder is obtained. The carbon-containing powder is fired in an air atmosphere at a temperature of 700°C for 10 hours. Sampling and weighing, adding an excess of 8% lithium salt and silicon dioxide, ball milli...

Embodiment 3

[0081] A certain type of waste ternary lithium battery scraps are used as raw materials. Firstly, cut the waste scraps into 0.5x0.5cm scraps of 2.5kg, put them into the pyrolysis furnace and heat-treat at 650°C for 1min, then take them out while they are still hot and directly add them to ice water to cool them down from 450°C to 10°C instantly. At the same time, the ultrasonic vibration treatment was performed for 20 minutes to peel off the positive electrode material and the aluminum foil, and the aluminum foil and the black powder were filtered with a large-pore sieve to obtain an aluminum foil with a smooth surface. The black powder is filtered to remove moisture, dried at 60° C., and then sieved for a second time to filter out metal debris; a carbon-containing positive electrode powder is obtained. The carbon-containing powder is fired in an oxygen-enriched atmosphere at a temperature of 750°C for 2 hours. Sampling and weighing, adding an excess of 3% lithium salt and yt...

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Abstract

The invention discloses a method and a system for recycling and preparing a composite positive electrode material from corner waste and defective products. The method includes: classifying and crushing waste, scraps and defective products to obtain positive electrodes; Roasting treatment to obtain positive electrode powder; ball milling and sintering the mixture containing the positive electrode powder, lithium salt and coating raw material to obtain repaired composite positive electrode material. The invention uses dry separation to preferentially peel off the positive electrode powder and foil, the separation process is a physical process, green and environmentally friendly; then the positive electrode powder is roasted to remove carbon powder and organic matter, and then modified and sintered to obtain the repaired composite positive electrode powder , can be directly used for battery production. The method of the invention has simple technological process, high recovery rate, good product consistency, stable performance and strong application potential.

Description

technical field [0001] The invention relates to a lithium battery cathode recycling method, in particular to a method and system for recycling and preparing a composite cathode material from leftover waste and defective products, and belongs to the technical field of lithium battery recycling. Background technique [0002] Lithium and lithium compounds are important energy materials, widely used in energy storage power supply and national defense construction. Lithium-ion batteries have the characteristics of high energy density, high voltage platform, small self-discharge, and no memory effect. They have developed into the main energy source of 3C electronic products, accounting for more than 80% of the consumer electronics market. Benefiting from the high growth of the new energy vehicle industry, domestic power battery shipments were 39.2GWh in 2017, and it is expected that the CAGR will remain above 30% in the next three years. The effective life of the battery of a pas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54H01M10/052
CPCH01M10/052H01M10/54Y02E60/10Y02W30/84
Inventor 彭正军王敏祝增虎王怀有贾国凤赵有璟
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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