Separator, method of manufacturing separator, and electrochemical device including separator

Patent metadata

Field	Value
Publication number	US-12113239-B2
Application number	US-202318331554-A
Country	US
Kind code	B2
Filing date	Jun 8, 2023
Priority date	Jun 9, 2022
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

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.

First claim

What is claimed is:

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:
A a Si(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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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).

10. 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.

Assignees

• Sk Innovation Co Ltd
• Sk Ie Tech Co Ltd

Inventors

• Bae Heung Taek
• Lee Chang Hee
• Kwack Won Sub
• Kwon Tae Wook

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• C08L29/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C08L39/04

  Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member · CPC title

• C09D7/65

  macromolecular (C09D7/41-C09D7/48 take precedence) · CPC title

• C09D7/61

  inorganic · CPC title