# US 2025/0219244 A1 · Coated battery separator comprising porous polymeric coating, and battery comprising the same

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- Number: US 2025/0219244 A1
- Document ID: US20250219244A1
- Status: Published application
- Kind: A1
- Application number: 18/853,382
- Filed: 2023-04-07
- Published: 2025-07-03
- Earliest claimed: 2022-04-08
- Assignees: Celgard, LLC
- Applicants: Celgard, LLC
- Inventors: Wenbin Yin; Zhengming Zhang
- Web page: https://patentgrep.com/patent/US20250219244A1

## CPC

- H01M 50/414: Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M 50/423: Polyamide resins
- H01M 50/426: Fluorocarbon polymers
- H01M 50/434: Ceramics
- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- H01M 50/449: having a layered structure
- H01M 50/457: comprising three or more layers
- 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

A coated battery separator, comprising the battery separator; and a porous coating on at least one side of the battery separator, wherein the porous coating comprises a polymer comprising an amide functional group.

## Claims

### Claim 1

A coated battery separator, comprising:
a battery separator; and
a porous coating on at least one side of the battery separator, wherein the porous coating comprises a polymer comprising an amide functional group.

### Claim 2 (depends on 1)

The coated battery separator of claim 1, wherein the porous coating has a thickness less than 5 microns.

### Claim 3 (depends on 1)

The coated battery separator of claim 1, wherein the porous coating has a thickness less than 2 microns.

### Claim 4 (depends on 1)

The coated battery separator of claim 1, wherein the amide group is a cyclic amide group or a non-cyclic amide group.

### Claim 5 (depends on 4)

The coated battery separator of claim 4, wherein the amide group is a cyclic amide group.

### Claim 6 (depends on 4)

The coated battery separator of claim 4, wherein the amide group is a non-cyclic amide group.

### Claim 7 (depends on 1)

The coated battery separator of claim 1, wherein the polymer comprising an amide functional group is Poly (N-vinylacetamide) PNVA homopolymer or copolymer.

### Claim 8 (depends on 1)

The coated battery separator of claim 1, wherein the porous coating mainly comprises the polymer comprising an amide functional group or blends of the polymer comprising an amide functional group and at least one other polymer.

### Claim 9 (depends on 1)

The coated battery separator of claim 1, wherein the porous coating further comprises a ceramic.

### Claim 10 (depends on 9)

The coated battery separator of claim 9, wherein the ceramic is present in an amount less than 50%.

### Claim 11 (depends on 9)

The coated battery separator of claim 9, wherein the ceramic is present in an amount less than 30%.

### Claim 12 (depends on 1)

The coated battery separator of claim 1, exhibiting an MD shrinkage less than 1% at 120° C.

### Claim 13 (depends on 2)

The coated battery separator of claim 2, exhibiting an MD shrinkage less than 1% at 120° C.

### Claim 14 (depends on 3)

The coated battery separator of claim 3, exhibiting an MD shrinkage less than 1% at 120° C.

### Claim 15 (depends on 1)

The coated battery separator of claim 1, further comprising an adhesive coating on top of the porous coating.

### Claim 16 (depends on 8)

The coated battery separator of claim 8, further comprising an adhesive coating on top of the porous coating.

### Claim 17 (depends on 9)

The coated battery separator of claim 9, further comprising an adhesive coating on top of the porous coating.

### Claim 18 (depends on 8)

The coated battery separator of claim 8, wherein the porous coating comprises a sticky polymer.

### Claim 19 (depends on 9)

The coated battery separator of claim 9, wherein the porous coating further comprises a sticky coating.

### Claim 20 (depends on 1)

A method for forming the coated battery separator of claim 1, comprising providing an aqueous coating slurry comprising the polymer comprising an amide functional group and providing a battery separator (or base film or polymer membrane) to be coated on at least one side with the aqueous coating slurry.

### Claim 21 (depends on 20)

The method of claim 20, wherein the coating slurry further comprises a compound that generates gas when heated.

### Claim 22 (depends on 20)

The method of claim 20, wherein the coating slurry further comprises a ceramic.