CN-122000516-A - Electrode separation method and separation system

Abstract

In the electrode separation method, an electrode including an electrode current collector and an electrode active material layer and a counter electrode portion electrically connected to the electrode are immersed in a conductive solution. An electrical signal is applied. By applying an electrical signal, separation efficiency can be improved. In addition, the recycling efficiency of the electrode active material can be improved.

Inventors

• Jin Zanhao
• LU HENGZHOU
• Sun Bingji
• Quan Jingzhong
• Han Jijia
• Zheng Xixiu

Assignees

• SK新能源株式会社
• 世宗大学校产学协力团

Dates

Publication Date

20260508

Application Date

20251107

Priority Date

20241108

Claims (14)

1. 1. An electrode separation method comprising the steps of: Immersing an electrode including an electrode current collector and an electrode active material layer and a counter electrode portion electrically connected to the electrode in a conductive solution, and An electrical signal is applied.
2. 2. The electrode separation method according to claim 1, wherein the step of applying an electrical signal includes generating a gas between the electrode current collector and the electrode active material layer.
3. 3. The electrode separation method of claim 1, wherein the step of applying an electrical signal comprises applying a direct current signal.
4. 4. The electrode separation method according to claim 1, wherein the step of applying an electrical signal includes applying an electrical signal so that a current value is 0.01A to 8A.
5. 5. The electrode separation method of claim 1, wherein the conductive solution comprises a water-based solvent.
6. 6. The electrode separation method of claim 1, wherein the conductive solution comprises a transition metal.
7. 7. The electrode separation method according to claim 6, wherein the transition metal comprises one or more of nickel, cobalt, and manganese.
8. 8. The electrode separation method according to claim 6, wherein the transition metal comprises nickel, and the mole number of nickel is 0.2 to 0.9 of the total mole number of transition metals.
9. 9. The electrode separation method according to claim 6, wherein a concentration of the transition metal in the conductive solution is 0.2M to 1.5M.
10. 10. The electrode separation method according to claim 1, wherein the electrode is moved by a moving part.
11. 11. The electrode separation method according to claim 10, wherein the electrode and the counter electrode are separated by a separation portion.
12. 12. The electrode separation method according to claim 1, wherein the electrode is obtained by heat-treating a waste lithium secondary battery at 500 ℃ or less.
13. 13. The electrode separation method according to claim 1, wherein the conductivity of the counter electrode is 1S/m or more.
14. 14. An electrode separation system, comprising: an electrode part including an electrode current collector and an electrode active material layer; A counter electrode portion electrically connected to the electrode portion; a reaction part for immersing the electrode part and the counter electrode part in a conductive solution, and And an electric signal applying section for applying an electric signal.

Description

Electrode separation method and separation system Technical Field The invention relates to an electrode separation method and an electrode separation system. Background Secondary batteries are rechargeable and dischargeable batteries, and with the development of information communication and display industries, secondary batteries are widely used as power sources for portable electronic communication devices such as camcorders, cellular phones, notebook computers, and the like. In addition, in recent years, a battery pack including a secondary battery is being developed and used as a power source of an environment-friendly automobile such as an electric automobile. The lithium secondary battery may include an electrode assembly including a positive electrode, a negative electrode, and a separator, and an electrolyte impregnating the electrode assembly. In addition, the lithium secondary battery may include an exterior material (e.g., in the form of a soft pack) that accommodates the electrode assembly and the electrolyte. Lithium metal oxide may be used as a positive electrode active material of the positive electrode. The lithium metal oxide may contain a transition metal such as nickel, cobalt, manganese, etc. Electrode separation methods are being studied due to the manufacturing cost, environmental protection problems, etc. of the expensive metal strips. For example, the positive electrode current collector and the positive electrode active material layer may be separated from the positive electrode, and the metal may be recovered by acid-treating the positive electrode active material layer. Although the positive electrode current collector and the positive electrode active material layer may be separated using a sodium hydroxide solution, a metal (e.g., aluminum) contained in the positive electrode current collector may remain on the surface of the positive electrode active material during the separation process, and the remaining metal may act as an impurity during the reuse of the positive electrode active material. Disclosure of Invention First, the technical problem to be solved It is an object of the present invention to provide an electrode separation method with improved efficiency. It is an object of the present invention to provide an electrode separation system with improved efficiency. (II) technical scheme According to the electrode separation method of the embodiment of the present invention, an electrode including an electrode current collector and an electrode active material layer and a counter electrode portion electrically connected to the electrode are immersed in a conductive solution. An electrical signal is applied. According to an exemplary embodiment, in the applying of the electric signal, a gas may be generated between the electrode current collector and the electrode active material layer. According to an exemplary embodiment, in the step of applying an electrical signal, a direct current signal may be applied. According to an exemplary embodiment, in the step of applying an electrical signal, the electrical signal may be applied so that the current value is 0.01A to 8A. According to an exemplary embodiment, the conductive solution may include a water-based solvent. According to an exemplary embodiment, the conductive solution may include a transition metal. According to an exemplary embodiment, the transition metal may include one or more of nickel, cobalt, and manganese. According to an exemplary embodiment, the transition metal may include nickel, and the mole number of nickel may be 0.2 to 0.9, among the total mole number of the transition metal. According to an exemplary embodiment, the concentration of the transition metal in the conductive solution may be 0.2M to 1.5M. According to an exemplary embodiment, the electrode may be moved by a moving part. According to an exemplary embodiment, the electrode and the counter electrode may be separated by a separation portion. According to an exemplary embodiment, the electrode may be obtained by heat-treating a waste lithium secondary battery at 500 ℃ or less. According to an exemplary embodiment, the conductivity (ELECTRICAL CONDUCTIVITY) of the counter electrode may be 1S/m or more. The electrode separation system according to an exemplary embodiment includes an electrode part including an electrode current collector and an electrode active material layer, a counter electrode part electrically connected to the electrode part, a reaction part for partially immersing the electrode part and the counter electrode part in a conductive solution, and an electric signal application part for applying an electric signal. (III) beneficial effects According to the electrode separation method of the embodiment of the present invention, an electrode including an electrode current collector and an electrode active material layer and a counter electrode portion electrically connected to the electrode are immersed in a conductive solution,