# US 12,191,473 B2 · Rolling method for electrode

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- Number: US 12,191,473 B2
- Document ID: US12191473B2
- Status: Granted
- Kind: B2
- Application number: 17/762,541
- Filed: 2021-07-30
- Published: 2022-10-27
- Granted: 2025-01-07
- Earliest claimed: 2020-08-21
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Il Hong Kim; Sung Chul Lim; Yo Han Kwon
- Web page: https://patentgrep.com/patent/US12191473B2

## CPC

- G01N 11/00: Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- H01M 4/0435: {Rolling or calendering}
- H01M 4/04: Processes of manufacture in general
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- G01N 2011/002: {Controlling sample temperature; Thermal cycling during measurement}
- H01M 4/139: Processes of manufacture
- Y02E 60/10: Energy storage using batteries
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A rolling method for an electrode, the method comprising the steps of: coating an electrode slurry including an electrode active material, on a current collector, to form an electrode specimen; measuring rheological properties of the electrode specimen according to temperature; deriving an appropriate temperature condition for rolling the electrode from the rheological properties of the electrode specimen according to temperature; and rolling the electrode in the appropriate temperature condition.

## Claims

### Claim 1

A method for rolling an electrode, the method comprising:
preparing an electrode specimen by applying an electrode slurry containing an electrode active material on a current collector;
measuring a rheological property of the electrode specimen according to a temperature;
deriving an appropriate temperature condition for rolling an electrode from the rheological property of the electrode specimen according to the temperature; and
manufacturing the electrode and rolling the electrode under the appropriate temperature condition.

### Claim 2 (depends on 1)

The method of claim 1, wherein the appropriate temperature condition corresponds to a temperature range between a beta transition temperature and an alpha transition temperature (Tcr).

### Claim 3 (depends on 1)

The method of claim 1, wherein the rheological property is a phase angle.

### Claim 4 (depends on 3)

The method of claim 3, wherein the phase angle (8) is expressed as a following formula 1:
δ=tan−1(G″/G′), [Formula 1]
wherein G′ denotes a storage modulus, and G″ denotes a loss modulus, and wherein the G′ and the G″ are measured by a rheometer which vibrates in a range of 0.1 to 10 Hz.

### Claim 5 (depends on 1)

The method of claim 1, wherein the deriving of the appropriate temperature condition includes building a database of information on the rheological property of the electrode specimen according to the temperature.

### Claim 6 (depends on 5)

The method of claim 5, wherein the appropriate temperature condition is derived from the database.

### Claim 7 (depends on 6)

The method of claim 6, wherein the appropriate temperature condition for rolling the electrode is derived from a temperature condition at a specific point where a tendency of a rheological property change is changed according to a temperature in the database.

### Claim 8 (depends on 1)

The method of claim 1, wherein the rolling of the electrode under the appropriate temperature condition includes rolling the electrode using a roller which has been heated under the appropriate temperature condition.

### Claim 9 (depends on 1)

The method of claim 1, wherein the rolling of the electrode under the appropriate temperature condition includes heating the electrode before being rolled, under the appropriate temperature condition.

### Claim 10 (depends on 1)

A method for manufacturing an electrode including the method for rolling the electrode according to claim 1, preceded by preparing the electrode active material and preparing the electrode slurry by mixing the electrode active material with at least a conductive material and a binder.

### Claim 11 (depends on 10)

A method for manufacturing a secondary battery including:
preparing a positive and a negative electrode using the method for manufacturing the electrode according to claim 10; and
alternately stacking the positive electrode, a separator, and the negative electrode.