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A method for efficiently recycling waste lithium battery cathode materials by leaching

A cathode material and recycling method technology, which is applied in the field of efficient recovery of waste lithium battery cathode materials by leaching method, can solve problems such as waste of resources and energy, and achieve the effects of fast leaching speed and short recovery cycle time.

Active Publication Date: 2021-03-02
深圳鑫茂新能源技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, waste lithium batteries contain many valuable resources, such as cobalt, lithium, manganese and other metal substances. If they cannot be recycled, it is also a major waste of resources and energy.

Method used

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  • A method for efficiently recycling waste lithium battery cathode materials by leaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Place the lithium battery whose positive electrode material is lithium iron phosphate in a sodium chloride solution with a mass concentration of 2%, take it out after 4 hours, and complete the discharge;

[0021] (2) Manually disassemble the discharged lithium battery to obtain a complete positive electrode material;

[0022] (3) Put the complete positive electrode material in a muffle furnace, heat it to 450°C for 2 hours, then transfer it to a fluidized bed, feed nitrogen, maintain the pressure at 0.3MPa, heat it to 80°C, and treat it for 50 minutes to achieve activity Rapid separation of materials and current collectors;

[0023] (4) The specific method for the pretreatment of the active material is to mix the active material with calcium bicarbonate particles with a particle size of 1-5 μm, add it to a high-energy ball mill, and grind it for 60 minutes at a speed of 240 r / min. Wash with dilute hydrochloric acid until no gas is produced, and then wash with deion...

Embodiment 2

[0027] (1) Place the lithium battery whose positive electrode material is lithium cobalt oxide in a sodium chloride solution with a mass concentration of 2%, take it out after 3 hours, and complete the discharge;

[0028] (2) Manually disassemble the discharged lithium battery to obtain a complete positive electrode material;

[0029] (3) Put the complete positive electrode material in a muffle furnace, heat it to 400°C for 1 hour, then transfer it to a fluidized bed, feed nitrogen, maintain the pressure at 0.2MPa, heat it to 90°C, and treat it for 30 minutes to achieve activity Rapid separation of materials and current collectors;

[0030] (4) The specific method for the pretreatment of the active material is to mix the active material with calcium bicarbonate particles with a particle size of 1-5 μm, add it to a high-energy ball mill, and grind it for 60 minutes at a speed of 280 r / min. Wash with dilute hydrochloric acid until no gas is generated, and then wash with deioniz...

Embodiment 3

[0034] (1) Place a lithium battery whose positive electrode material is lithium nickelate in a sodium chloride solution with a mass concentration of 2%, take it out after 5 hours, and complete the discharge;

[0035] (2) Manually disassemble the discharged lithium battery to obtain a complete positive electrode material;

[0036] (3) Put the complete positive electrode material in a muffle furnace, heat it to 420°C for 1.5h, then transfer it to a fluidized bed, feed nitrogen, maintain the pressure at 0.25MPa, heat it to 85°C, and treat it for 40min to achieve Rapid separation of active materials and current collectors;

[0037] (4) The specific method for the pretreatment of the active material is to mix the active material with calcium bicarbonate particles with a particle size of 1-5 μm, add it to a high-energy ball mill, and grind it for 40 minutes at a speed of 260 r / min. Wash with dilute hydrochloric acid until no gas is generated, and then wash with deionized water for ...

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Abstract

The invention relates to the field of lithium battery material recovery, and provides a method for efficiently recovering waste lithium battery positive electrode materials by leaching. The steps of the recycling method include discharging, dismantling, rapid separation of the active material and the current collector, pretreatment of the active material, and recovery of metals in the active material by using leachate. Described leach solution is by mass ratio 3-4:3-5:8-10:4-6: 5‑6:100 composition. This method can not only achieve a leaching rate of more than 90% for lithium, iron, nickel, cobalt, and manganese in the positive electrode material of the lithium battery, but also has a fast leaching speed, and the entire recovery cycle takes a short time.

Description

technical field [0001] The invention belongs to the field of lithium battery material recovery, and provides a method for efficiently recovering waste lithium battery positive electrode materials by leaching. Background technique [0002] The lifespan of power lithium batteries is generally 8-10 years, and the lifespan of lithium batteries for portable electronic products is usually 1-3 years, so a large amount of lithium battery waste is generated every year. In the lithium battery production process, there are 2-5% production waste. With the sharp increase in the output of lithium batteries, on the one hand, it brings convenience to life, and on the other hand, it also brings difficulties in recycling and disposal. [0003] After the electrode materials and electrolyte in the waste lithium battery enter the environment, a series of chemical changes will occur, such as hydrolysis, oxidation, decomposition, etc., resulting in heavy metal pollution, fluoride pollution, acid-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C22B7/00C22B23/00C22B26/12
CPCC22B7/007C22B23/0415C22B26/12H01M10/54Y02W30/84Y02P10/20
Inventor 艾戊云孔令超袁海中蒋涛
Owner 深圳鑫茂新能源技术股份有限公司
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