# US 12,218,343 B2 · Electrode manufacturing method comprising cleaning step using laser, electrode manufactured by method, and secondary battery comprising same

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- Number: US 12,218,343 B2
- Document ID: US12218343B2
- Status: Granted
- Kind: B2
- Application number: 17/433,858
- Filed: 2021-01-21
- Published: 2022-05-12
- Granted: 2025-02-04
- Earliest claimed: 2020-02-07
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Hyoung Sik Choi; Jun Hyeak Huh; Jeoung Soo Kim; Ki Woong Kim; In Gu An; Ki Eun Sung
- Web page: https://patentgrep.com/patent/US12218343B2

## CPC

- H01M 4/366: {as layered products}
- H01M 10/052: Li-accumulators
- B23K 26/351: for trimming or tuning of electrical components
- B23K 26/352: for surface treatment
- B23K 26/362: Laser etching
- B23K 26/40: taking account of the properties of the material involved
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/364: {as mixtures}
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/663: {containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres}
- H01M 10/0404: {Machines for assembling batteries}
- H01M 10/0413: {Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes}
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- B23K 2101/36: Electric or electronic devices
- H01M 4/04: Processes of manufacture in general
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present technology relates to an electrode manufacturing method, an electrode manufactured by the method, and a secondary battery comprising same, the electrode manufacturing method comprising a cleaning step performed by laser irradiation, in lines corresponding to each other in a direction perpendicular to an electrode current collector, onto a top-coated electrode mixture layer and a back-coated electrode mixture layer of the electrode current collector, and may prevent a mismatch of the electrode mixture layers and may significantly reduce the degree of sliding occurrence at the boundary region.

## Claims

### Claim 1

A method for manufacturing an electrode, comprising:
cleaning an end of a coated part contacting a non-coated part by irradiating laser to a top-coated electrode mixture layer and a back-coated electrode mixture layer of an electrode current collector along a boundary line of the coated part,
wherein the cleaning is performed so that a line of irradiating laser to the top-coated electrode mixture layer of the electrode current collector and a line of irradiating laser to the back-coated electrode mixture layer of the electrode current collector correspond to each other in a direction perpendicular to that of the electrode current collector,
wherein the cleaning is performed so that a formation angle at the end of the coated part is in a range of 75° to 88° on a boundary line of the coated part contacting the non-coated part.

### Claim 2 (depends on 1)

The method of claim 1, wherein during the cleaning, a process of irradiating laser to the top-coated electrode mixture layer of the electrode current collector; and a process of irradiating laser to the back-coated electrode mixture layer of the electrode current collector are performed simultaneously.

### Claim 3 (depends on 1)

The method of claim 1, wherein during the cleaning, one of two processes including: a process of irradiating laser to the top-coated electrode mixture layer of the electrode current collector; and a process of irradiating laser to the back-coated electrode mixture layer of the electrode current collector is first performed, and a remaining one of the two processes is then performed.

### Claim 4 (depends on 1)

The method of claim 1, further comprising top-coating an electrode mixture layer and back-coating the electrode mixture layer before the cleaning,
wherein a formation area of the top-coated electrode mixture layer and a formation area of the back-coated electrode mixture layer are in a range of 101 to 105% of an area of a predetermined final electrode mixture layer, respectively.

### Claim 5

An electrode comprising:
an electrode current collector;
a top-coated electrode mixture layer; and
a back-coated electrode mixture layer,
wherein a ratio (RWa/RWb) of a weight ratio (RWa) of the back-coated electrode mixture layer to the top-coated electrode mixture layer per a unit area (1 cm×1 cm) selected from a region (boundary region) including a boundary line of the coated part, to a weight ratio (RWb) of the back-coated electrode mixture layer to the top-coated electrode mixture layer per a unit area selected from a region (central region) which does not include the boundary line of the coated part, is in a range of 0.85 to 1.15 on a basis of the top-coated electrode mixture layer and the back-coated electrode mixture layer facing each other while interposing the electrode mixture layer therebetween.

### Claim 6 (depends on 5)

The electrode of claim 5, wherein a formation angle at an end of the top-coated electrode mixture layer and a formation angle at an end of the back-coated electrode mixture layer are in a range of 75° to 90°, respectively, on the boundary line of the coated part contacting the non-coated part.

### Claim 7

An electrode assembly comprising:
a positive electrode;
a negative electrode; and
a separator interposed between the positive electrode and the negative electrode,
wherein a ratio (RW2/RW1) of a weight ratio (RW2) of a positive electrode mixture layer to a negative electrode mixture layer per a unit area (1 cm×1 cm) selected from a region (boundary region) including a boundary line of a coated part, to a weight ratio (RW1) of the positive electrode mixture layer to the negative electrode mixture layer per a unit area (1 cm×1 cm) selected from a region (central region) which does not include the boundary line of the coated part is in a range of 0.8 to 1 on a basis of a positive electrode and a negative electrode facing each other while interposing the separator therebetween.

### Claim 8 (depends on 7)

The electrode assembly of claim 7, wherein the negative electrode includes:
a current collector layer; and
a negative electrode mixture layer formed on opposite surfaces of the current collector layer and including a negative electrode active material,
wherein the negative electrode active material includes a silicon (Si)-based active material.

### Claim 9 (depends on 7)

The electrode assembly of claim 7, wherein the negative electrode includes:
a current collector layer; and
a negative electrode mixture layer formed on surfaces of the current collector layer and including a negative electrode active material,
wherein the negative electrode active material includes a carbon-based active material and a silicon-based active material in a 10 to 95:5 to 90 weight ratio.

### Claim 10 (depends on 7)

A secondary battery comprising an electrode assembly according to claim 7.