Combined treatment method of waste lithium ion battery negative electrode and diaphragm

A lithium-ion battery and combined treatment technology, applied in chemical instruments and methods, battery recycling, carbon compounds, etc., can solve the problems of layer edge and surface instability, graphite layer expansion and edge peeling, graphite products can not be compared, etc., to achieve Increase the use of added value, reduce energy consumption and costs, and save resources

Active Publication Date: 2019-11-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with commercial negative electrode graphite, the layer edge and surface of recycled graphite will become unstable as the cycle progresses during the battery cycle, and graphite layer expansion and edge peeling will occur, which makes the recycled graphite products unable to be compared with commercial products. Compared with other carbonaceous materials, the competitive advantage is not obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Break the negative electrode of the waste lithium-ion battery and the PE separator into 3cm 2 The fragments are uniformly mixed to obtain mixed fragments, wherein the mass ratio of the negative electrode to the separator is 10:1;

[0027] (2) Add the mixed chips into solvent A with a volume ratio of NMP and toluene of 3:1, a liquid-solid mass ratio of 10:1, and mechanically stir at a temperature of 140° C. for 6 h. The copper foil is separated from the solution using a screen, rinsed with alcohol, dried and recycled. The remaining solution is denoted as solution B;

[0028] (3) The solution B was sonicated at 50° C., the power was 800 W, the frequency was 300 kHz, and the sonication time was 3 h. Obtain solid C and filtrate respectively through filtration afterwards, and the filtrate of collecting returns step (2) and reuses as solvent;

[0029] (4) The solid C was placed under a nitrogen atmosphere for high-temperature carbonization, the gas flow rate was 100 mL...

Embodiment 2

[0032] (1) Break the waste lithium-ion battery negative electrode and PP separator into 1.5cm 2 The fragments are uniformly mixed to obtain mixed fragments, wherein the mass ratio of the negative electrode to the diaphragm is 7:1;

[0033] (2) Add the mixed chips into solvent A with a volume ratio of DMA and p-xylene of 5:1, a liquid-solid mass ratio of 7:1, and stir at a temperature of 100° C. for 5 h. The copper foil is separated from the solution using a screen, rinsed with alcohol, dried and recycled. The remaining solution is denoted as solution B;

[0034] (3) Ultrasonicate the solution B at 40°C with a power of 500W, a frequency of 150kHz, and an ultrasonic time of 2h, and then filter to obtain solid C and filtrate respectively, and return the collected filtrate to step (2) for reuse as a solvent;

[0035] (4) The solid C was placed in an argon atmosphere for high-temperature carbonization, the gas flow rate was 50 mL / min, the heating rate was 5 °C / min, and the temper...

Embodiment 3

[0038] (1) Break the negative electrode of the waste lithium-ion battery and the three-layer separator of PE-PP-PE into 0.5cm 2 The fragments are uniformly mixed to obtain mixed fragments, wherein the mass ratio of the negative electrode to the separator is 5:1;

[0039] (2) Add the mixed fragments to solvent A with a volume ratio of THF to trichlorethylene of 2:1, a liquid-solid mass ratio of 5:1, and jet-stirring at a temperature of 70°C for 3 hours. The copper foil is separated from the solution using a screen, rinsed with alcohol, dried and recycled. The remaining solution is denoted as solution B;

[0040] (3) Ultrasonicate the solution B at 0°C with a power of 400W, a frequency of 20kHz, and an ultrasonic time of 1h, and then filter to obtain solid C and filtrate respectively, and return the collected filtrate to step (2) for repeated use as a solvent;

[0041] (4) The solid C was placed under a nitrogen atmosphere for high-temperature carbonization, the gas flow rate ...

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Abstract

The invention discloses a combined treatment method of a waste lithium ion battery negative electrode and a diaphragm; the combined treatment method comprises the following steps of (1) carrying out crushing on the waste lithium ion battery negative electrode and the diaphragm, performing mixing to obtain mixed fragments, wherein the mass ratio of the negative electrode to the diaphragm is 5-10: 1; (2) putting the mixed fragments into a mixed solvent, stirring for 3-6 hours at the temperature of 70-140 DEG C, separating and recovering a copper foil from the solution, carrying out ultrasonic treatment on the residual solution at 0-70 DEG C, and separating to obtain a solid and a filtrate, and returning the collected filtrate to the step (2) to be repeatedly used as a solvent; and (3) carrying out high-temperature carbonization on the solid in an inert atmosphere to obtain the composite carbon material. According to the method, the high-additional-value utilization of the carbon materialand the diaphragm of the waste lithium ion battery can be realized, meanwhile, the copper foil can be recycled in an elementary substance form, the operation is simple, the cost is low, the environment is protected, and the like.

Description

technical field [0001] The invention belongs to the technical field of recycling waste batteries, and in particular relates to a combined treatment method for anodes and separators of waste lithium ion batteries. Background technique [0002] Lithium-ion batteries (LIB) have been widely used in 3C digital products and new energy vehicles due to their advantages such as high specific energy, wide operating temperature range and no memory effect. Taking power lithium-ion batteries as an example, due to the limited life of power batteries (3 to 5 years), with the rapid development of the new energy industry, there will be about 120,000-170,000 tons of waste power batteries that need to be recycled by 2020. Otherwise, the harmful substances in it will cause serious pollution to the atmosphere, water and soil. [0003] At present, the recycling methods of spent lithium-ion battery negative electrodes mainly include fire recycling and wet recycling. However, fire recovery requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C01B32/05C01B32/205C22B7/00C22B15/00
CPCH01M10/54C22B15/0063C22B7/006C01B32/05C01B32/205Y02W30/84Y02P10/20
Inventor 田忠良赖延清李松贤罗飞林龚培育张凯
Owner CENT SOUTH UNIV
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