Manufacturing apparatus and manufacturing method of electrode for secondary battery using laser, and electrode for secondary battery manufactured by the same

Patent metadata

Field	Value
Publication number	US-12476240-B2
Application number	US-202017640962-A
Country	US
Kind code	B2
Filing date	Sep 16, 2020
Priority date	Dec 23, 2019
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

Provided are a manufacturing apparatus and a manufacturing method of an electrode for a secondary battery which forms a large number of holes in the electrode mixture having a level difference in thickness, by irradiating twice or less with a nanosecond laser, and an electrode for a secondary battery manufactured by the same.

First claim

The invention claimed is:

1 . An apparatus for manufacturing an electrode for a secondary battery, comprising:
a roller-shaped unwinder on which a sheet type current collector is wound; a transfer roller configured to continuously transfer the sheet type current collector; a coater configured to coat an electrode active material slurry on at least one surface of the sheet type current collector; a dryer configured to dry the coated electrode active material slurry to form an electrode mixture on at least one surface of the sheet type current collector; a roller configured to roll the electrode mixture through a pair of rollers; a laser adapted to subject the electrode mixture to laser etching to form a plurality of holes having thicknesses, thereby manufacturing an electrode sheet; and, a roller-shaped rewinder configured to rewind the electrode sheet, wherein the laser is a nanosecond laser, and is adapted to form respective holes by performing irradiation twice or less, wherein the nanosecond laser satisfies the following conditions 1 to 4: [Condition 1] Average Power: 26 W to 100 W, [Condition 2] Repetition Rate: 28 kHz to 70 kHz, [Condition 3] Pulse Duration: 55 ns to 220 ns, [Condition 4] Pulse Energy: 0.28 mJ to 2.84 mJ.

2 . The apparatus for manufacturing an electrode according to claim 1 ,
wherein the transfer roller is configured to transfer the sheet type current collector at a speed of 40 m/min to 80 m/min.

3 . The apparatus for manufacturing an electrode according to claim 1 ,
wherein the plurality of holes have a conical shape whose diameter decreases in a direction of the sheet type current collector from a surface portion of the electrode mixture.

4 . The apparatus for manufacturing an electrode according to claim 1 ,
wherein the plurality of holes have a diameter at a surface portion of the electrode mixture and a depth in a direction of the sheet type current collector from the surface portion of the electrode mixture in a ratio of 1:1 to 2:1.

5 . The apparatus for manufacturing an electrode according to claim 1 ,
wherein the plurality of holes have a diameter of 10 μm to 50 μm at a surface of the electrode mixture, and an interval between respective holes is from 100 μm to 500 μm.

6 . The apparatus for manufacturing an electrode according to claim 1 , wherein the laser further includes a polygon mirror and is configured to etch through the polygon mirror at the time of laser etching.

7 . A method for manufacturing an electrode for a secondary battery, the method comprising:
(a) preparing an electrode slurry containing an active material; (b) coating the electrode slurry onto at least one surface of a sheet type current collector to be transferred, and drying the same to form an electrode mixture, and rolling the electrode mixture; and (c) subjecting the electrode mixture to laser etching to form a large number of holes having a level difference in thickness, thereby manufacturing an electrode sheet; wherein the laser etching (c) performs irradiation twice or less with a nanosecond laser to form respective holes; and wherein the nanosecond laser satisfies the following conditions 1 to 4: [Condition 1] Average Power: 26 W to 100 W, [Condition 2] Repetition Rate: 28 kHz to 70 kHz, [Condition 3] Pulse Duration: 55 ns to 220 ns, [Condition 4] Pulse Energy: 0.28 mJ to 2.84 mJ.

8 . The method for manufacturing an electrode according to claim 7 ,
wherein the sheet type current collector is transferred at a speed of 40 m/min to 80 m/min.

9 . The method for manufacturing an electrode according to claim 7 ,
wherein the holes are formed in a conical shape whose diameter decreases in a direction of the sheet type current collector from a surface portion of the electrode mixture, and a diameter at the surface portion of the electrode mixture and a depth in the direction of the sheet type current collector from the surface portion of the electrode mixture are formed in a ratio of 1:1 to 2:1.

10 . The method for manufacturing an electrode according to claim 7 ,
wherein the holes are formed such that a diameter at a surface of the electrode mixture is 10 μm to 50 μm, and an interval between respective holes is 100 μm to 500 μm.

11 . The method for manufacturing an electrode according to claim 7 ,
wherein during the laser etching (c), a polygon mirror is used.

12 . An electrode for a secondary battery, comprising:
an electrode mixture formed on at least one surface of a sheet type current collector, and a large number of conical-shaped holes formed in the electrode mixture so as to form a level difference in thickness, wherein a diameter of the holes at a surface portion of the electrode mixture and a depth of the holes in a direction of the sheet type current collector from the surface portion of the electrode mixture are in a ratio of 1:1 to 2:1, and wherein the electrode is manufactured by the method of claim 7 .

13 . The electrode according to claim 12 , wherein the diameter at the surface portion of the electrode mixture of the holes is 10 μm to 50 μm, and an interval between the respective holes is 100 μm to 500.

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Taejong
• Jeong Yujin
• Jung Su Taek
• Bae Sangho
• Choi Seong Won

Classifications

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/0435

  Rolling or calendering · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title