# US 12,113,239 B2 · Separator, method of manufacturing separator, and electrochemical device including separator

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- Number: US 12,113,239 B2
- Document ID: US12113239B2
- Status: Granted
- Kind: B2
- Application number: 18/331,554
- Filed: 2023-06-08
- Published: 2023-12-14
- Granted: 2024-10-08
- Earliest claimed: 2022-06-09
- Assignees: SK Innovation Co., Ltd.; SK ie technology Co., Ltd.
- Applicants: SK Innovation Co., Ltd.; SK Ie Technology Co., Ltd.
- Inventors: Heung Taek Bae; Chang Hee Lee; Won Sub Kwack; Tae Wook Kwon
- Web page: https://patentgrep.com/patent/US12113239B2

## CPC

- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/403: Manufacturing processes of separators, membranes or diaphragms
- H01M 50/443: Particulate material
- H01M 50/449: having a layered structure
- H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- Y02E 60/10: Energy storage using batteries
- 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

Provided are a separator, a method of manufacturing the separator, and an electrochemical device including the separator. According to an embodiment of the present disclosure, a separator including a porous substrate and an inorganic particle layer provided on at least one surface of the porous substrate, the inorganic particle layer including inorganic particles, a hydrolytic condensate binder of a polar silane compound, and an aqueous polymer binder, wherein an amount of change in peel strength, ΔP is 1.1 or more may be provided.

## Claims

### Claim 1

A method of manufacturing a separator, the method comprising:
(a) stirring a polar silane compound represented by the following Chemical Formula 1, inorganic particles, an acid component, an aqueous polymer binder, and water to prepare a coating slurry; and
(b) applying the coating slurry prepared on at least one surface of a polyolefin-based porous substrate and drying the slurry to prepare an inorganic particle layer:
AaSi(OR)b Chemical Formula 1
wherein A is independently a polar functional group or a C1-C10 alkyl group having a polar functional group, R is independently hydrogen or a C1-C5 alkyl group, a is 1 to 2, b is 2 to 3, and a+b is 4,
wherein the polar functional group includes any one or two or more of an amino group, an epoxy group, a carboxyl group, a hydroxyl group, an amide group, a thiol group, a ketone group, an ester group, and an aldehyde group, and
wherein the polyolefin-based porous substrate is prepared by a hydrophilic surface treatment.

### Claim 2 (depends on 1)

The method of manufacturing a separator of claim 1, wherein the coating slurry of (a) is prepared by including the following processes (a1) to (a3):
(a1) preparing an acid aqueous solution including a polar silane compound represented by Chemical Formula 1 and an acid component;
(a2) stirring inorganic particles, an acid component, and water to prepare an inorganic slurry; and
(a3) stirring the inorganic slurry prepared above, an acid aqueous solution, and an aqueous polymer binder to prepare a coating slurry.

### Claim 3 (depends on 2)

The method of manufacturing a separator of claim 2, wherein the preparing of a coating slurry (a3) is performed under a weakly acidic atmosphere of more than pH 4 and pH 6 or less.

### Claim 4 (depends on 2)

The method of manufacturing a separator of claim 2, wherein an absolute value of a difference in pH between the inorganic slurry prepared in the process (a2) and the acid aqueous solution prepared in the process (a1) is 1 or less.

### Claim 5 (depends on 2)

The method of manufacturing a separator of claim 2, wherein in the process (a1), the polar silane compound is included at 10 wt % or less with respect to the total weight of the acid aqueous solution.

### Claim 6 (depends on 1)

The method of manufacturing a separator of claim 1, wherein in the process (a), the polar silane compound is included at 5 wt % or less with respect total weight of the coating slurry.

### Claim 7 (depends on 1)

The method of manufacturing a separator of claim 1, wherein the process of preparing of a coating slurry (a) is performed under a weakly acidic atmosphere of more than pH 4 and pH 6 or less.

### Claim 8 (depends on 1)

The method of manufacturing a separator of claim 1, wherein the acid component is carbon dioxide; or an organic acid including any one or two selected from acetic acid and lactic acid.

### Claim 9 (depends on 1)

The method of manufacturing a separator of claim 1, further comprising: (c) aging the polyolefin-based porous substrate having the inorganic particle layer provided thereon, after the process (b).

### Claim 10 (depends on 1)

The method of manufacturing a separator of claim 1,
wherein the hydrophilic surface treatment is performed by including one or more of a corona discharge treatment and a plasma discharge treatment.