CN-116261490-B - Electrode manufacturing method and electrode manufacturing system used in the method

CN116261490BCN 116261490 BCN116261490 BCN 116261490BCN-116261490-B

Abstract

The present invention provides a method for manufacturing an electrode, and a system for manufacturing an electrode used in the above method, the method comprising the steps of (a) laminating an active material layer on a surface of a current collector, and (b) removing a portion of the active material layer by irradiating a laser beam on the surface of the active material layer, wherein a process of supplying moisture to the active material layer is performed before the laser beam is irradiated to the active material layer in step (b).

Inventors

LI RUIJUN
LI XIAOJIN
JIN TAIZHU
LI HEZHU
PU TINGXIAN

Assignees

株式会社LG新能源

Dates

Publication Date: 20260512
Application Date: 20220718
Priority Date: 20210721

Claims (12)

1. A method for manufacturing an electrode, the method comprising the steps of: (a) Laminating an active material layer on the surface of a current collector, and (B) A portion of the active material layer is removed by irradiating a laser beam on a surface of the active material layer, Wherein a process of supplying moisture to the active material layer is performed before the laser beam is irradiated to the active material layer in step (b), and A step of performing corona treatment on the surface of the current collector on which the active material layer is to be laminated, before step (a), and a step of heat treatment for stabilization after step (b).
2. The method for manufacturing an electrode according to claim 1, wherein the supply of moisture in step (b) is performed in such a manner that moisture permeates into the active material layer before the laser beam is irradiated.
3. The method for manufacturing an electrode according to claim 2, wherein the supply of moisture is performed by a spraying method.
4. The method for manufacturing an electrode according to claim 1, wherein a horizontal cross section of the laser beam has a rectangular or linear shape.
5. The method for manufacturing an electrode according to claim 1, wherein the laser beam is infrared radiation light and has a wavelength of 700 nm to 1100 nm.
6. The method for manufacturing an electrode according to claim 1, wherein the step of laminating the active material layer of step (a) is performed by coating the active material.
7. The method for manufacturing an electrode according to claim 1, wherein a portion where the active material layer is partially removed in step (b) forms an active material uncoated portion.
8. The method for manufacturing an electrode according to claim 1, wherein step (a) and step (b) are performed on both the front side and the back side of the current collector.
9. The method for manufacturing an electrode according to claim 1, wherein steps (a) and (b) are performed in a process of manufacturing an electrode by a roll-to-roll process.
10. A system for manufacturing an electrode, comprising: A current collector supply device that supplies the current collector in a flat shape; an active material coating device for coating an active material layer on a surface of the supplied current collector; a moisture supply device for supplying moisture to the active material layers laminated by the active material coating device, and A laser etching device for etching a part of the active material layer to which the moisture is supplied, and The system for manufacturing an electrode further includes a corona treatment device positioned in front of the coating device and a heat treatment device positioned behind the laser etching device.
11. The system for manufacturing an electrode according to claim 10, wherein the moisture supply means is a moisture injection means.
12. The system for manufacturing an electrode according to claim 10, wherein the current collector supply device is a roll-to-roll device.

Description

Electrode manufacturing method and electrode manufacturing system used in the method Technical Field The present application claims the benefit of priority based on korean patent application No. 10-2021-0095769 filed on 7/21 of 2021, the entire contents of which are incorporated herein by reference. The present invention relates to a method of manufacturing an electrode and an electrode manufacturing system used in the above method. Background As the demand for mobile devices and electric vehicles increases, the demand for secondary batteries increases rapidly. In particular, lithium secondary batteries having high energy density and voltage among secondary batteries have been commercialized and widely used. The lithium secondary battery has a structure in which an electrolyte containing a lithium salt is impregnated into an electrode having an active material applied to a current collector, that is, an electrode assembly having a porous separator between a positive electrode and a negative electrode. The electrode is manufactured by forming an active material layer on a current collector through a mixing process of preparing a slurry by mixing/dispersing an active material, a binder, and a conductive material in a solvent, a coating process of applying the active material slurry to a thin film current collector and drying the active material slurry, and a pressing process for increasing the capacity density of the electrode after the coating process and for increasing the adhesion property between the current collector and the active material. When the active material slurry is applied to the current collector, it is known that it is difficult to form a uniform surface at the distal end of the active material layer due to the formation of drag lines and/or islands, as shown in fig. 2. In addition, at the edge of the active material layer, a sliding portion in which the thickness of the active material layer gradually decreases is formed, thereby causing a problem of reduction in the capacity of the active material layer, as shown in fig. 3. In addition, when the paste is applied to both surfaces of the current collector, a mismatch occurs where the positions of the paste applied to the upper and lower surfaces are not matched, as shown in fig. 3. This mismatch causes misalignment of the positions of the active material layers when the positive/negative electrodes face each other, and this misaligned portion reduces the charge/discharge efficiency. In particular, the mismatched portions may cause lithium to deposit on the surface of the anode, and when such lithium deposition is performed for a long time, the capacity of the battery decreases. Meanwhile, in order to solve the above-described problems, a laser etching method has been introduced, but in the case of this method, there is a problem in that an active material is deteriorated (heat affected zone) due to heat of a laser beam. Therefore, a method capable of uniformly forming an end portion of an active material layer, preventing the formation of a sliding portion and/or a mismatched portion, and preventing the deterioration of an active material is required. [ Prior art document ] Japanese laid-open patent publication No. 2000-251942 Disclosure of Invention Technical problem It is an object of the present invention to provide an electrode manufacturing method and an electrode manufacturing system capable of uniformly forming an end portion of an active material layer without a sliding portion and/or a mismatched portion by laser etching, which are designed to solve the above-described problems of the related art. Another object of the present invention is to provide an electrode manufacturing method and an electrode manufacturing system capable of preventing a problem (generation of a heat affected zone) of active material degradation due to heat of a laser beam during laser etching. Technical proposal To achieve the above object, the present invention provides a method for manufacturing an electrode, the method comprising the steps of: (a) Laminating an active material layer on the surface of a current collector, and (B) A portion of the active material layer is removed by irradiating a laser beam on the surface of the active material layer, Wherein a process of supplying moisture to the active material layer is performed before the laser beam is irradiated to the active material layer in step (b). In addition, the present invention provides a system for manufacturing an electrode, the system comprising: a current collector supply device that supplies a flat-shaped current collector; an active material coating device for coating an active material layer on a surface of a supplied current collector; a moisture supply device for supplying moisture to the active material layers laminated by the active material coating device, and And a laser etching device for etching a portion of the active material layer to which the moisture is supplied. Advantage