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A method for electrolytic separation of positive electrode materials and aluminum current collectors in waste lithium-ion batteries

A lithium-ion battery and cathode material technology, which is applied in the field of waste lithium-ion battery recycling, can solve the problems of poor sieving of cathode materials, large liquid consumption, and long time consumption, so as to reduce input and process steps, improve efficiency, cost saving effect

Active Publication Date: 2019-03-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the method of dissolving the binder with an organic solution, due to the high viscosity of the organic solvent, after dissolution, it will cause problems such as poor screening of subsequent positive electrode materials
However, the dissolution of lye has the problems of taking a long time, consuming a large amount of liquid, and generating a large amount of waste gas during the dissolution process.

Method used

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  • A method for electrolytic separation of positive electrode materials and aluminum current collectors in waste lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Disassemble the waste laminated battery with the size of 89mm wide * 144mm high * 12.5mm thick after discharging, take out the positive electrode sheet, and obtain a positive electrode sheet of 69mm * 139mm (height * width) after cleaning;

[0027] (2) After sealing the surroundings of the positive electrode sheet, fix it in the electrolytic cell, add 60% H in the electrolytic cell 3 PO 4 +40%C 2 h 5 Electrolyte composed of OH system solution, soak the positive plate in the electrolyte for no less than 10 minutes to fully infiltrate it;

[0028] (3) With the positive electrode sheet as the anode, the lead plate symmetrically arranged on both sides of the positive electrode sheet is used as the cathode, so that the end face coated with the positive electrode material on the positive electrode sheet is facing the lead plate; the aluminum current collector in the positive electrode sheet is passed through the wire and Connect the positive electrode of the power supp...

Embodiment 2

[0031] Its electrolysis equipment such as figure 1 As shown, the positive electrode sheet 3 is placed in the middle of the electrolytic cell 1 equipped with the electrolyte 7 as the anode, and the two lead plates 2 symmetrically placed on both sides of the positive electrode sheet 3 are used as the cathode, and the positive electrode sheet 3 is coated with The end face covered with the positive electrode material faces the lead plate 2; then the aluminum current collector 4 in the positive electrode sheet 3 is connected to the positive pole of the power supply 6 through the lead 5, and the two lead plates 2 are connected to the negative pole of the power supply 6 through the lead 5, After electrification, an electrochemical reaction occurs, and the aluminum at the interface in contact with the positive electrode material is electrolyzed to separate the aluminum current collector.

Embodiment 3

[0033] (1) Disassemble the waste laminated battery with the size of 89mm wide * 144mm high * 12.5mm thick after discharging, take out the positive electrode sheet, and obtain a positive electrode sheet of 69mm * 139mm (height * width) after cleaning;

[0034] (2) After sealing the surroundings of the positive electrode sheet, fix it in the electrolytic cell, add 20% Na in the electrolytic cell 2 CO 3 +8%Na 2 SiO 3 +2%Na 3 PO 3 Electrolyte composed of alkaline aqueous solution, so that the positive plate is soaked in the electrolyte for not less than 10 minutes, so that it is fully infiltrated;

[0035] (3) With the positive electrode sheet as the anode, the lead plate symmetrically arranged on both sides of the positive electrode sheet is used as the cathode, so that the end face coated with the positive electrode material on the positive electrode sheet is facing the lead plate; the aluminum current collector in the positive electrode sheet is passed through the wire and ...

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Abstract

The invention provides a method for electrolytically separating a cathode material and an aluminum current collector in a waste lithium ion battery. The method comprises the following steps that the waste lithium ion battery is discharged and dismantled, and a cathode plate in the waste lithium ion battery is taken out and cleaned; after the periphery of the cathode plate is sealed, the cathode plate is fixed into an electrolytic bath, and electrolyte is added into the electrolytic bath to enable the cathode plate to be fully infiltrated; the cathode plate is taken as an anode, a lead plate is taken as a cathode, the aluminum current collector in the cathode plate is connected with a positive electrode of a power supply through a wire, the lead plate is connected with a negative electrode of the power supply through a wire, an electrochemical reaction is conducted after energizing is conducted, aluminum at the contact interface of the aluminum current collector and the cathode material is electrolyzed, and then the aluminum current collector is separated out; the cathode material adhered to the aluminum current collector falls into the electrolyte, the aluminum current collector is obtained, and the electrolyte is sieved to obtain the cathode material. According to the method, the contact interface of the aluminum current collector and the cathode material is directly broken from the interior, so that the cathode material and the aluminum current collector are fully separated; the aluminum current collector recycling rate can reach 99% or above.

Description

technical field [0001] The invention relates to the technical field of recycling waste lithium ion batteries, in particular to a method for electrolytically separating positive electrode materials and aluminum current collectors in waste lithium ion batteries. Background technique [0002] In recent years, lithium-ion batteries have entered thousands of households. The usage of lithium-ion batteries has not only grown steadily in the 3C field, but also has shown explosive growth in the field of electric vehicles. With the substantial increase in lithium battery production capacity, the lithium battery industry is facing two major problems. One is the slow depletion of lithium battery resources, and the mining volume cannot keep up with demand; the other is that with the completion of the life cycle of lithium batteries, a large number of waste lithium batteries are produced. It will cause serious environmental pollution problems. Therefore, it is of great significance to re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54H01M10/0525C25C3/06C25C3/30C25C3/34
CPCC25C3/06C25C3/30C25C3/34H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 欧阳浩淼李新峰王双双
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY