# US 10,770,714 B2 · Electrode manufacturing method for improving battery capacity and electrode manufactured thereby

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- Number: US 10,770,714 B2
- Document ID: US10770714B2
- Status: Granted
- Kind: B2
- Application number: 15/513,473
- Filed: 2015-10-26
- Published: 2017-10-26
- Granted: 2020-09-08
- Earliest claimed: 2015-10-23
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Tae-Su Kim; Jin-Soo Lee; Bu-Gon Shin; Ki-Eun Sung; Dae-Han Seo
- Web page: https://patentgrep.com/patent/US10770714B2

## CPC

- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/139: Processes of manufacture
- H01M 10/052: Li-accumulators
- B23K 26/356: by shock processing
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2010/4292: {Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention relates to an electrode manufacturing method, an electrode manufactured thereby, and a battery comprising the same, the electrode manufacturing method comprising the steps of: applying an electrode active material onto a collector; and radiating a laser such that the end of an electrode active material layer, which has been obtained by applying the electrode active material, becomes straight, thereby removing the electrode active material. The present invention is advantageous in that the difference in area between active materials applied to the positive and negative electrodes, respectively, is minimized, thereby increasing the capacity and improving the stability of the battery.

## Claims

### Claim 1

A method for manufacturing an electrode, the method comprising the steps of:
forming a collector having a first side edge, a second side edge, a bottom edge and a top edge;
applying a coating of an electrode active material onto the collector, the coating extending from the bottom edge of the collector to an upper edge spaced from the top edge of the collector; and
radiating a laser onto an area of the coating such that the end of an electrode active material layer, which has been obtained by applying the electrode active material, becomes straight, thereby removing the electrode active material, the area having a straight bottom edge located between the bottom edge of the collector and the upper edge of the coating.

### Claim 2 (depends on 1)

The method of claim 1, wherein the laser is a pulse laser.

### Claim 3 (depends on 2)

The method of claim 2, wherein the pulse laser has a wavelength of 300 to 1,100 nm.

### Claim 4 (depends on 3)

The method of claim 3, wherein the pulse laser has a wavelength of 500 to 600 nm.

### Claim 5 (depends on 3)

The method of claim 3, wherein the pulse laser has a wavelength of 1,000 to 1,100 nm.

### Claim 6 (depends on 2)

The method of claim 2, wherein the pulse laser has a pulse energy of 0.05 to 5 mJ.

### Claim 7 (depends on 6)

The method of claim 6, wherein the pulse laser has a pulse energy of 0.1 to 3 mJ.

### Claim 8 (depends on 6)

The method of claim 6, wherein the pulse laser has a pulse energy of 0.5 to 2 mJ.

### Claim 9 (depends on 2)

The method of claim 2, wherein a beam shape of the pulse laser is a shape of circular flat-top beam, linear flat-top beam, or square flat-top beam.

### Claim 10 (depends on 1)

The method of claim 1, wherein the collector is a collector for a positive electrode, and the electrode active material is a positive electrode active material.

### Claim 11 (depends on 1)

The method of claim 1, wherein the collector is a collector for a negative electrode, and the electrode active material is a negative electrode active material.