Intrinsically safe treatment method and application for edge metal in decommissioned battery pole pieces

A treatment method and intrinsically safe technology, which is applied in the field of intrinsically safe treatment of edge metals in decommissioned battery pole pieces, can solve problems such as explosion and combustion, and achieve the effects of high activity, low treatment cost, and low activity

CN113308604BActive Publication Date: 2022-05-10HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-05-10

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Abstract

The invention belongs to the technical field of battery recycling, and discloses an intrinsically safe treatment method and application for edge metals in decommissioned battery pole pieces. The method comprises the following steps: cutting the waste electrode piece into a non-powder, then placing it in an ultrasonic environment, heating it in an oil bath, performing a hydrothermal reaction, and cooling to obtain a pretreated aluminum slag; taking out the pretreated aluminum slag for filtration, and taking The filter residue is washed to obtain aluminum slag and battery powder turbid liquid; the ground wire is inserted into the aluminum slag, and an oxidant is passed through to react to obtain non-hydrogen-releasing aluminum slag. The invention adopts a physical method to separate the battery powder and the aluminum foil in the waste pole piece, without adding chemicals, and the treatment cost is low. The solution after hydrothermal reaction and water washing can be used as the raw and auxiliary materials of the leaching solution. The whole treatment process will not produce secondary wastewater, waste gas, and waste residue, and the treatment process is environmentally friendly.
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Description

technical field

[0001] The invention belongs to the technical field of battery recycling, and in particular relates to an intrinsically safe treatment method and application for edge metals in decommissioned battery pole pieces. Background technique

[0002] In the manufacturing process of lithium-ion batteries, a certain amount of waste pole pieces will be produced in the pole piece production process. In the case of large-scale production and manufacture of lithium-ion batteries, a large number of waste pole pieces will be produced.

[0003] The traditional waste pole piece recycling process is to crush the pole piece, and then carry out the next step of high-temperature pyrolysis, the binder will fail, and the battery powder will be separated from the aluminum foil. The pyrolysis temperature is generally 300-500°C, and the pyrolysis process will This causes the metal aluminum foil to react with oxygen in the air environment, which not only reduces the recovery rate of me...

Examples

Embodiment 1

[0052] The intrinsically safe treatment method for the edge metal in the decommissioned battery pole piece of this embodiment includes the following specific steps:

[0053] (1) Cut the waste electrode sheet to a strip with a length of 50 mm and a width of 2 mm;

[0054] (2) Put the strip into the hydrothermal reaction kettle, the addition of the strip is 20% of the volume of the reaction kettle, add water according to the filling degree of 50%, and close the hydrothermal reaction kettle;

[0055] (3) Put the hydrothermal reaction kettle in the ultrasonic generator, heat the hydrothermal reaction kettle to 180°C in an oil bath in the ultrasonic generator, turn on the ultrasonic, control the ultrasonic power to 28kHz, and ultrasonically treat for 10 hours. Cool to room temperature to obtain pretreated aluminum slag;

[0056] (4) Take out the hydrothermal reaction kettle, filter the internal materials of the reaction kettle, rinse with water and then filter again, repeat severa...

Embodiment 2

[0063] The intrinsically safe treatment method for the edge metal in the decommissioned battery pole piece of this embodiment includes the following specific steps:

[0064] (1) Cut the waste electrode sheet to a strip with a length of 2mm and a width of 20mm;

[0065] (2) Put the strip into the hydrothermal reactor, the addition of the ribbon is 30% of the volume of the reactor, add water according to the filling degree of 60%, and close the hydrothermal reactor;

[0066] (3) Put the hydrothermal reaction kettle in the ultrasonic generator, heat the hydrothermal reaction kettle to 150°C in an oil bath in the ultrasonic generator, turn on the ultrasonic, control the ultrasonic power to 40kHz, and ultrasonically treat for 2 hours. Cool to room temperature to obtain pretreated aluminum slag;

[0067] (4) Take out the hydrothermal reaction kettle, filter the internal materials of the reaction kettle, rinse with water and then filter again, repeat several times, take the strip on...

Embodiment 3

[0074] The intrinsically safe treatment method for the edge metal in the decommissioned battery pole piece of this embodiment includes the following specific steps:

[0075] (1) Cut the waste electrode sheet to a strip with a length of 2mm and a width of 40mm;

[0076] (2) Put the strip into the hydrothermal reaction kettle, the addition of the strip is 50% of the volume of the reaction kettle, add water according to the filling degree of 80%, and close the hydrothermal reaction kettle;

[0077](3) Put the hydrothermal reaction kettle in the ultrasonic generator, heat the hydrothermal reaction kettle to 120°C in an oil bath in the ultrasonic generator, turn on the ultrasonic, control the ultrasonic power to 80kHz, and ultrasonically treat for 0.5h. Cool naturally to room temperature to obtain pretreated aluminum slag;

[0078] (4) Take out the hydrothermal reaction kettle, filter the internal materials of the reaction kettle, rinse with water and then filter again, repeat sev...