# US 12,183,948 B2 · Separator for secondary battery, manufacturing method therefor, and lithium secondary battery comprising same

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- Number: US 12,183,948 B2
- Document ID: US12183948B2
- Status: Granted
- Kind: B2
- Application number: 17/609,804
- Filed: 2019-12-11
- Published: 2022-07-28
- Granted: 2024-12-31
- Earliest claimed: 2019-05-09
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Jaehyun Cho; Byung-Soo Kim
- Web page: https://patentgrep.com/patent/US12183948B2

## CPC

- H01M 50/449: having a layered structure
- C08J 9/36: After-treatment (C08J9/22 takes precedence)
- C09D 127/16: Homopolymers or copolymers of vinylidene fluoride
- C09D 133/08: Homopolymers or copolymers of acrylic acid esters
- H01M 50/403: Manufacturing processes of separators, membranes or diaphragms
- H01M 50/42: Acrylic resins
- H01M 50/426: Fluorocarbon polymers
- H01M 50/443: Particulate material
- 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
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An embodiment provides a separator for a secondary battery, a manufacturing method therefor, and a lithium secondary battery comprising same, the separator including: a porous substrate; and a coating layer including a plurality of ring patterns on at least one surface of the porous substrate, wherein the ring patterns include a plurality of polymer particulates; the ring pattern is spaced apart from each other at regular intervals; a particle diameter of the ring pattern is 10 μm to 200 μm, and a ring of the ring pattern has a width (thickness of the ring) of 0.2 μm to 1.5 μm.

## Claims

### Claim 1

A separator for a secondary battery, comprising:
a porous substrate; and
a coating layer including a plurality of ring patterns on at least one surface of the porous substrate,
wherein:
the ring patterns include a plurality of polymer particulates,
the ring patterns are spaced apart from each other at regular intervals,
a diameter of each of the ring patterns is 10 μm to 200 μm, and
a thickness of each of the ring patterns is 0.2 μm to 1.5 μm, the thickness of each of the ring patterns being a difference between an inner diameter and an outer diameter of each of the ring patterns.

### Claim 2 (depends on 1)

The separator of claim 1, wherein the ring patterns are spaced apart from each other at an interval of 10 μm to 1000 μm.

### Claim 3 (depends on 1)

The separator of claim 1, wherein each of the ring patterns has a diameter of 50 μm to 150 μm.

### Claim 4 (depends on 1)

The separator of claim 1, wherein each of the ring patterns has a thickness of 0.5 μm to 1.2 μm.

### Claim 5 (depends on 1)

The separator of claim 1, wherein the polymer particulates include at least one of fluorine-based polymer particulates, (meth) acrylic polymer particulates, and a mixture thereof.

### Claim 6 (depends on 1)

The separator of claim 1, wherein a particle diameter of the polymer particulates is 100 nm to 600 nm.

### Claim 7 (depends on 5)

The separator of claim 5, wherein the fluorine-based polymer particulates include at least one of polyvinylidene fluoride (PVdF), polyvinylidene fluoride-co-hexafluoropropylene, and polyvinylidene fluoride-co-trichloroethylene.

### Claim 8 (depends on 5)

The separator of claim 5, wherein the (meth) acrylic polymer particulates include at least one of poly (meth) acrylate, polybutyl (meth) acrylate, polypentyl (meth) acrylate, polyhexyl (meth) acrylate, and polyacrylonitrile.

### Claim 9 (depends on 1)

The separator of claim 1, wherein the ring patterns have a loading amount of 0.5 g/m2 to 1.5 g/m2.

### Claim 10 (depends on 1)

The separator of claim 1, wherein the coating layer has a thickness of 0.1 μm to 5 μm.

### Claim 11 (depends on 1)

The separator of claim 1, wherein;
an area of the ring patterns including inner spaces surrounded by the ring patterns is 40% to 80% of a total area of the porous substrate, and
an area occupied by the ring patterns without the inner spaces surrounded by the ring patterns is 5% to 30% of the total area of the porous substrate.

### Claim 12 (depends on 1)

A method of manufacturing the separator of claim 1, the method comprising:
mixing at least one of fluorine-based polymer particulates, (meth) acrylic polymer particulates, and a mixture thereof with water to prepare a coating layer composition; and
coating the coating layer composition on the at least one surface of the porous substrate by an inkjet coating method and drying it to manufacture the separator.

### Claim 13 (depends on 12)

The method of claim 12, wherein the coating layer composition has a viscosity of 0.1 cps to 10 cps.

### Claim 14 (depends on 12)

The method of claim 12, wherein the coating layer composition includes fluorine-based polymer particulates and (meth) acrylic polymer particulates in a weight ratio of 90:10 to 50:50.

### Claim 15 (depends on 12)

The method of claim 12, wherein the fluorine-based polymer particulates include polymer particulates having a particle diameter of 100 nm to 300 nm.

### Claim 16 (depends on 12)

The method of claim 12, wherein the (meth) acrylic polymer includes polymer particulates having a particle diameter of 250 nm to 600 nm.

### Claim 17 (depends on 12)

The method of claim 12, wherein the inkjet coating method includes spraying and coating the coating layer composition with a nozzle number density of 50 (dpi) to 1000 (dpi) of an inkjet head, at a frequency of 1.0 KHz to 10 KHz at a temperature of 20° C. to 55° C., and at a speed of 10 mm/sec to 500 mm/sec on the porous substrate.

### Claim 18 (depends on 1)

The separator of claim 1, wherein each of the ring patterns has an annular shape, the plurality of polymer particulates being within the annular shape of each of the ring patterns.

### Claim 19

A method of manufacturing a separator for a secondary battery, the method comprising:
mixing fluorine-based polymer particulates and (meth) acrylic polymer particulates in a weight ratio of 90:10 to 50:50 to prepare a coating layer composition;
coating the coating layer composition on at least one surface of a porous substrate by an inkjet coating method to form a coating layer, such that the coating layer includes a plurality of ring patterns on the at least one surface of the porous substrate,
wherein:
the ring patterns are spaced apart from each other at regular intervals,
a diameter of each of the ring patterns is 10 μm to 200 μm, and
a thickness of each of the ring patterns is 0.2 μm to 1.5 μm.