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A method for efficient stripping of waste lithium-ion battery materials

A lithium-ion battery and electrode material technology, which is applied in the field of efficient stripping of waste lithium-ion battery materials, can solve the problems of large amount of organic solvent, complicated operation, and long process, and achieve the effect of fast stripping speed, simple operation, and high efficiency

Active Publication Date: 2021-04-02
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses organic solvents to treat waste lithium cobalt oxide batteries. The process is long, the operation is complicated, the amount of organic solvents is large, and the cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put the positive / negative electrode sheets obtained after dismantling the lithium-ion battery into a microwave sintering furnace with a microwave power of 1.4kw. Under air conditions, the temperature was raised to 350°C at a rate of 10°C / min, and kept for 120min. The pole piece is cooled with the furnace, taken out and sieved, the oversieve is aluminum foil / copper foil, and the undersieve is positive / negative electrode material. The remaining amount of positive / negative electrode materials on the aluminum foil / copper foil is 1.0wt.%.

Embodiment 2

[0030] Put the positive and negative plates obtained after dismantling the lithium-ion battery into a microwave sintering furnace with a microwave power of 2.0kw, vacuumize to 50kPa, raise the temperature to 400°C at a heating rate of 20°C / min, and keep warm for 60min. The pole piece is cooled with the furnace, taken out and sieved, the oversieve is aluminum foil / copper foil, and the undersieve is positive / negative electrode material. The remaining amount of positive / negative electrode materials on the aluminum foil / copper foil is 0.8wt.%.

Embodiment 3

[0032]The positive and negative plates obtained after dismantling the lithium-ion battery were placed in a microwave sintering furnace with a microwave power of 2.5kw. Under air conditions, the temperature was raised to 500°C at a heating rate of 30°C / min and kept for 30 minutes. The pole piece is cooled with the furnace, taken out and sieved, the oversieve is aluminum foil / copper foil, and the undersieve is positive / negative electrode material. The remaining amount of positive / negative electrode materials on the aluminum foil / copper foil is 0.3wt.%.

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PUM

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Abstract

The invention relates to the technical field of spent lithium-ion battery treatment, and provides a method for efficiently stripping material of a spent lithium-ion battery. The method comprises the following steps: carrying out microwave sintering on a pole piece obtained after disassembling the spent lithium ion battery, and carrying out cooling, and then, separating powders on the surface of the pole piece to obtain a metal foil and an electrode material respectively, wherein the temperature of the microwave sintering is 350-500 DEG C, and the heat preservation time is 30-120 minutes. Organic binder molecules vibrate in a high-frequency magnetic field (microwave) and collide and rub with one another to generate heat energy, and the temperature of a material is rapidly increased from inside to outside after the material absorbs the energy, so that an organic binder is decomposed in a short time, and the purpose of separating the positive and negative electrode material and the metalfoil is achieved; and the method provided by the invention has the advantages of short flow, simple operation, no pollution, high stripping speed and high efficiency, and can obtain complete metal foil and the clean positive and negative electrode material.

Description

technical field [0001] The invention relates to the technical field of waste lithium ion battery treatment, in particular to a method for efficiently stripping waste lithium ion battery materials. Background technique [0002] With the development of mobile communication and electronics industry, lithium-ion batteries have also been developed rapidly and are widely used in mobile phones, notebook computers, tablet computers, digital cameras, electric vehicles and other fields. According to statistics, the global consumption of lithium-ion batteries has risen rapidly from 500 million in 2000 to 7 billion in 2015. It is predicted that by 2020, the number of waste lithium-ion batteries in my country alone will reach 25 billion, with a total weight of 500,000 tons. After a lithium-ion battery has been charged and discharged hundreds to thousands of times, the electrode active material will gradually lose its activity due to structural changes, dissolution and loss, etc., result...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 文小强周有池郭春平刘雯雯王玉香赖华生张帆普建周新华陈燕飞袁德林
Owner GANZHOU NONFERROUS METALLURGICAL RES INST