# US 12,183,947 B2 · Separator, including composite coating layer containing inorganic particles and hydrophilic organic compound arranged on web of organic fibers, preparation method of same, and secondary battery comprising same

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- Number: US 12,183,947 B2
- Document ID: US12183947B2
- Status: Granted
- Kind: B2
- Application number: 17/436,758
- Filed: 2019-12-19
- Published: 2022-06-16
- Granted: 2024-12-31
- Earliest claimed: 2019-03-06
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Jungjin Moon
- Web page: https://patentgrep.com/patent/US12183947B2

## CPC

- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- C23C 16/40: Oxides
- C23C 16/455: characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- H01M 50/403: Manufacturing processes of separators, membranes or diaphragms
- H01M 50/409: Separators, membranes or diaphragms characterised by the material
- H01M 50/414: Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M 50/417: Polyolefins
- H01M 50/42: Acrylic resins
- H01M 50/423: Polyamide resins
- H01M 50/434: Ceramics
- H01M 50/44: Fibrous material
- H01M 50/443: Particulate material
- H01M 50/454: comprising a non-fibrous layer and a fibrous layer superimposed on one another
- 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
- H01M 50/491: Porosity
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present disclosure relates to a separator, a method of preparing the separator, and a secondary battery comprising the separator, the separator including: a web structure of organic fibers; and a composite coating layer arranged on the organic fibers, wherein the composite coating layer includes heat-resistant inorganic particles and a hydrophilic organic compound.

## Claims

### Claim 1

A separator comprising:
a web structure of organic fibers; and
a composite coating layer arranged on the organic fibers,
wherein the composite coating layer includes heat-resistant inorganic particles and a hydrophilic organic compound, and has an atomic ratio of aluminum atoms, included in the heat-resistant inorganic particles, to nitrogen atoms, included in the hydrophilic organic compound, of 1:1 to 2:1, and
wherein the hydrophilic organic compound forms a self-assembled monolayer and comprises an organic compound including a hydroxyl group and an amine group.

### Claim 2 (depends on 1)

The separator of claim 1, wherein a thickness of the separator is from 5 μm to 100 μm.

### Claim 3 (depends on 1)

The separator of claim 1, wherein a contact angle of the separator with an organic electrolytic solution is 60° or less.

### Claim 4 (depends on 1)

The separator of claim 1, wherein a thermal shrinkage of the separator at 140° C. is less than 20%.

### Claim 5 (depends on 1)

The separator of claim 1, wherein the web structure of organic fibers is porous.

### Claim 6 (depends on 1)

The separator of claim 1, wherein the organic fibers comprise polyethylene fibers, polypropylene fibers, polyisobutylene fibers, polyvinyl chloride fibers, polyvinylidene chloride fibers, polyvinylidenefluoride fibers, polymethylmethacrylate fibers, polyacrylonitrile fibers, polyvinylalcohol fibers, polyethyleneterephthalate fibers, polybutyleneterephthalate fibers, polyimide fibers, polyester fibers, polytetrafluoroethylene fibers, polyamide fibers, polyarylenesulfide fibers, or a combination thereof.

### Claim 7 (depends on 1)

The separator of claim 1, wherein the composite coating layer is a base film layer.

### Claim 8 (depends on 1)

The separator of claim 1, wherein the composite coating layer is arranged to surround the organic fibers.

### Claim 9 (depends on 1)

The separator of claim 1, wherein in the composite coating layer, the hydrophilic organic compound surrounds the heat-resistant inorganic particles.

### Claim 10 (depends on 1)

The separator of claim 1, wherein a thickness of the composite coating layer is from 3 nm to 10 nm.

### Claim 11 (depends on 1)

The separator of claim 1,
wherein the hydrophilic organic compound comprises a catechol group that includes the hydroxyl group.

### Claim 12 (depends on 1)

The separator of claim 1,
wherein the hydrophilic organic compound comprises dopamine, a dopamine derivative, or a combination thereof that includes the hydroxyl group and the amine group.

### Claim 13 (depends on 1)

The separator of claim 1, wherein the heat-resistant inorganic particles comprise an inorganic metal oxide, an inorganic metal hydroxide, or a combination thereof.

### Claim 14 (depends on 13)

The separator of claim 13, wherein the heat-resistant inorganic particles comprise α-Al2O3, γ-Al2O3, Boehmite (γ-AlO(OH)), gibbsite (γ-Al(OH)3), SiO2, TiO2, SnO2, CeO2, ZrO2, CaO, MgO, NiO, ZnO, Y2O3, BaTiO3, Al(OH)3, Mg(OH)2, or a combination thereof.

### Claim 15 (depends on 1)

A secondary battery comprising:
a positive electrode;
a negative electrode; and
the separator of claim 1 interposed between the positive electrode and the negative electrode.

### Claim 16 (depends on 15)

The secondary battery of claim 15, wherein the secondary battery is a lithium-sulfur battery, a lithium-air battery, a lithium-ion battery, a sodium-ion battery, or an all-solid battery.

### Claim 17

A method of preparing a separator, the method comprising:
providing a web structure of organic fibers;
vapor-depositing heat-resistant inorganic particles; and
forming a composite coating layer including a hydrophilic organic compound, the hydrophilic organic compound comprises an organic compound including a hydroxyl group and an amine group, and having an atomic ratio of aluminum atoms, included in the heat-resistant inorganic particles, to nitrogen atoms, included in the hydrophilic organic compound, of 1:1 to 2:1.

### Claim 18 (depends on 17)

The method of claim 17, wherein the vapor-depositing is performed by chemical vapor deposition (CVD), atomic layer deposition (ALD), physical vapor deposition (PVD), or a combination thereof.

### Claim 19 (depends on 17)

The method of claim 17,
wherein the forming of the composite coating layer is performed by dip coating, press coating, spin coating, spraying, roller coating, or a combination thereof, using a solution including the hydrophilic organic compound.