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Method for recycling graphite negative electrode of waste battery

A graphite negative electrode and waste battery technology, which is applied to battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of easy generation of waste liquid and discomfort of recycling lithium-ion battery graphite negative electrodes, and achieve environmental protection, high efficiency, and high-quality process in the recycling process. The effect of simple process

Inactive Publication Date: 2021-08-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The graphite prepared by this method contains some metal impurities, and is easy to produce waste liquid, and there is no repair measure for the collapsed structure in the waste lithium-ion battery
In summary, this kind of pickling process is not suitable for recycling graphite negative electrodes of lithium-ion batteries.

Method used

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  • Method for recycling graphite negative electrode of waste battery
  • Method for recycling graphite negative electrode of waste battery
  • Method for recycling graphite negative electrode of waste battery

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This embodiment includes the following steps:

[0027] (1) Soak and discharge the graphite negative electrode of the waste lithium-ion battery in 2% sodium chloride solution for 20 hours, then dry and disassemble it to obtain 50 g of negative electrode material, and then artificially cut the negative electrode sheet into a 3 cm long and 5 cm wide negative electrode sheet;

[0028] (2) Place the obtained regenerated graphite negative electrode sheet in a 2mol / L ammonium persulfate solution at a solid-to-liquid ratio of 50g / L, heat it in a water bath to 60°C, and soak for 40min to completely dissolve the copper foil;

[0029] (3) After the reaction is completed, the graphite-containing solution is suction-filtered, washed three times with deionized water to neutrality, and dried to obtain regenerated graphite.

[0030] The regenerated graphite material prepared by the present embodiment is scanned by electron microscope, and the results are as follows: figure 2 As shown...

Embodiment 2

[0032] (1) Soak and discharge the graphite negative electrode of the waste lithium-ion battery in 6% sodium chloride solution for 18 hours, then dry and disassemble it to obtain 100 g of negative electrode material, and then artificially cut the negative electrode sheet into a 3 cm long and 8 cm wide negative electrode sheet;

[0033] (2) Place the obtained regenerated graphite negative electrode sheet in a 4mol / L sodium persulfate solution at a solid-to-liquid ratio of 30g / L, heat it in a water bath to 80°C, and soak for 40min to completely dissolve the copper foil;

[0034] (3) After the reaction is completed, the graphite-containing solution is suction-filtered, washed three times with deionized water to neutrality, and dried to obtain regenerated graphite.

[0035] The regenerated graphite material prepared by the present embodiment is carried out XRD test, and its result is as follows Figure 4 shown, similar to figure 2 (XRD diagram), it can be seen that the regenerate...

Embodiment 3

[0037] (1) Soak and discharge the graphite negative electrode of the waste lithium-ion battery in 4% sodium chloride solution for 24 hours, then dry and disassemble to obtain 80 g of negative electrode material, and then artificially cut the negative electrode sheet into a 3 cm long and 7 cm wide negative electrode sheet;

[0038] (2) Place the obtained regenerated graphite negative electrode sheet in a 5mol / L potassium dichromate solution at a solid-to-liquid ratio of 80g / L, heat in a water bath to 80°C, and soak for 60min to completely dissolve the copper foil;

[0039] (3) After the reaction is completed, the graphite-containing solution is suction-filtered, washed 5 times with deionized water to neutrality, and dried to obtain regenerated graphite.

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Abstract

The invention discloses a method for recycling a graphite negative electrode of a waste battery. The method comprises the following steps of (1) taking a waste lithium ion battery, discharging, disassembling, manually cutting or mechanically crushing to obtain a negative plate, (2) mixing the negative plate obtained in the step (1) with salt which is hydrolyzed to be acidic and has strong oxidizing property, and soaking until copper in the negative plate is completely dissolved, and (3) filtering the solution containing graphite, washing the obtained filter residue with deionized water, and drying to obtain regenerated graphite. According to the method provided by the invention, the pollution generated by the waste lithium ion battery is effectively reduced, and the waste graphite material of the negative electrode can be recycled to regenerate the graphite negative electrode material. The regenerated material has excellent mechanical strength and toughness, good cycle performance, large reversible capacity and high capacity retention rate.

Description

technical field [0001] The invention relates to the field of lithium ion battery recycling, in particular to a method for recycling graphite negative electrodes of waste batteries Background technique [0002] The first wave of power battery decommissioning came in 2018, and by 2020, decommissioned lithium-ion batteries will reach more than 60 gigawatt hours. By 2030, the number of people worldwide using electric vehicles will reach 228 million. With the rapid growth of electric vehicles, the annual demand for lithium-ion batteries is also growing rapidly, which means that more and more lithium-ion batteries will face retirement in the future. Since waste lithium-ion batteries contain heavy metals, organic solvents, and harmful electrolytes, if they are not recycled, they will cause great harm to the environment. At the same time, by 2020, the value of nickel, cobalt, manganese, lithium, iron and aluminum extracted from waste lithium-ion battery cells has reached 10.1 bill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/215H01M4/587H01M10/0525H01M10/54
CPCC01B32/215H01M4/587H01M10/0525H01M10/54H01M2004/027Y02W30/84Y02E60/10
Inventor 欧星萧厚桂龚海强张佳峰张宝
Owner CENT SOUTH UNIV
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