# US 2022/0045313 A1 · Fabrication Method of Negative Electrode for Secondary Battery and Secondary Battery Including Negative Electrode

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- Number: US 2022/0045313 A1
- Document ID: US20220045313A1
- Status: Published application
- Kind: A1
- Application number: 17/393,475
- Filed: 2021-08-04
- Published: 2022-02-10
- Earliest claimed: 2020-08-05
- Assignees: SK Innovation Co., Ltd.
- Applicants: SK Innovation Co., Ltd.
- Inventors: Byoung Wook Jo; Byung Chan Kang; Yong Hee Kang; Sung Jun Park; Hyo Sung Lim
- Web page: https://patentgrep.com/patent/US20220045313A1

## CPC

- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/622: {being polymers}
- H01M 4/625: {Carbon or graphite}
- H01M 10/04: Construction or manufacture in general (H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence)
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- 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
- 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 invention provides a fabrication method of a negative electrode for a secondary battery, including: (a) heating a slurry composition for a negative electrode containing a negative electrode active material, a binder, and a solvent to a temperature lower than a boiling point (Tb) of the solvent; (b) applying the heated slurry composition for a negative electrode onto a current collector; and (c) cooling the applied slurry composition for a negative electrode.

## Claims

### Claim 1

A fabrication method of a negative electrode for a secondary battery, comprising:
(a) heating a slurry composition for a negative electrode containing a negative electrode active material, a binder, and a solvent to a temperature lower than a boiling point (Tb) of the solvent;
(b) applying the heated slurry composition for a negative electrode onto a current collector; and
(c) cooling the applied slurry composition for a negative electrode.

### Claim 2 (depends on 1)

The fabrication method of a negative electrode for a secondary battery of claim 1, wherein a solid in the slurry composition for a negative electrode is contained in an amount of more than 55 parts by weight and 85 parts by weight or less based on 100 parts by weight of the slurry composition for a negative electrode.

### Claim 3 (depends on 1)

The fabrication method of a negative electrode for a secondary battery of claim 1, wherein a viscosity (A1) of the slurry composition for a negative electrode before being heated is 12,000 to 70,000 cP.

### Claim 4 (depends on 1)

The fabrication method of a negative electrode for a secondary battery of claim 1, wherein a temperature (T) of the heating of the slurry composition for a negative electrode satisfies the following Relational Equation 1:
0.3 Tb<T<0.9 Tb [Relational Equation 1]
wherein Tb is the boiling point of the solvent.

### Claim 5 (depends on 1)

The fabrication method of a negative electrode for a secondary battery of claim 1, wherein the cooling is performed at a temperature of 10 to 30° C. for 1 to 60 seconds.

### Claim 6 (depends on 1)

The fabrication method of a negative electrode for a secondary battery of claim 1, wherein the slurry composition for a negative electrode satisfies the following Relational Equations 2 and 3:
1.3≤A1/A2≤12 [Relational Equation 2]
1.2≤A3/A2≤10 [Relational Equation 3]
wherein A1 is a viscosity of the slurry composition for a negative electrode before being heated, A2 is a viscosity of the heated slurry composition for a negative electrode, and A3 is a viscosity of the cooled slurry composition for a negative electrode.

### Claim 7 (depends on 1)

The fabrication method of a negative electrode for a secondary battery of claim 1, further comprising (d) drying the cooled slurry composition for a negative electrode.

### Claim 8 (depends on 7)

The fabrication method of a negative electrode for a secondary battery of claim 7, wherein the drying is performed at a temperature of 90° C. or more and less than 135° C. for 20 to 150 seconds.

### Claim 9

A negative electrode for a secondary battery, fabricated by a fabrication method of a negative electrode for a secondary battery comprising:
(a) heating a slurry composition for a negative electrode containing a negative electrode active material, a binder, and a solvent to a temperature lower than a boiling point (Tb) of the solvent;
(b) applying the heated slurry composition for a negative electrode onto a current collector; and
(c) cooling the applied slurry composition for a negative electrode, the negative electrode comprising:
the current collector; and
a negative electrode active material layer formed on the current collector and containing a negative electrode active material, a conductive material, and a binder.

### Claim 10 (depends on 9)

The negative electrode for a secondary battery of claim 9, wherein an adhesive force of the negative electrode active material layer to the current collector is 0.20 N/cm or more.

### Claim 11 (depends on 9)

The negative electrode for a secondary battery of claim 9, wherein in the negative electrode, a difference between a maximum loading value and a minimum loading value of the negative electrode active material layer at five or more positions having regular intervals in a length direction is 10% or less of a total loading average value.

### Claim 12

A secondary battery comprising:
a negative electrode;
a positive electrode;
a separator positioned between the negative electrode and the positive electrode; and
an electrolyte,
wherein the negative electrode is fabricated by a fabrication method of a negative electrode for a secondary battery including:
(a) heating a slurry composition for a negative electrode containing a negative electrode active material, a binder, and a solvent to a temperature lower than a boiling point (Tb) of the solvent;
(b) applying the heated slurry composition for a negative electrode onto a current collector; and
(c) cooling the applied slurry composition for a negative electrode, and
the negative electrode includes:
the current collector; and
a negative electrode active material layer formed on the current collector and containing a negative electrode active material, a conductive material, and a binder.