# US 12,002,989 B2 · Separator, lithium-ion battery, and electronic device

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- Number: US 12,002,989 B2
- Document ID: US12002989B2
- Status: Granted
- Kind: B2
- Application number: 17/202,732
- Filed: 2021-03-16
- Published: 2021-09-30
- Granted: 2024-06-04
- Earliest claimed: 2020-03-31
- Assignees: Ningde Amperex Technology Limited
- Applicants: Ningde Amperex Technology Limited
- Inventors: Xiaohe Fan; ZengBin Wei
- Web page: https://patentgrep.com/patent/US12002989B2

## CPC

- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/457: comprising three or more layers
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/42: Acrylic resins
- H01M 50/434: Ceramics
- H01M 50/449: having a layered structure
- H01M 50/609: Arrangements or processes for filling with liquid, e.g. electrolytes
- 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 separator includes a porous substrate and a hybrid coating layer disposed on a surface of the porous substrate. The hybrid coating layer includes a plurality of polymer particles and a binder. Each polymer particle includes a shell and a cavity defined in the shell. The polymer particle can swell and damage when comes in contact with an electrolyte.

## Claims

### Claim 1

A separator, comprising:
a porous substrate;
a hybrid coating layer, wherein the hybrid coating layer comprises a plurality of polymer particles and a binder, each polymer particle comprises a shell and a cavity defined in the shell, and the each polymer particle swells and damages when comes in contact with an electrolyte; and
a ceramic coating layer coated on at least one surface of the porous substrate, wherein the hybrid coating layer is disposed on a surface of the ceramic coating layer and/or a surface of the porous substrate not coated with the ceramic coating layer.

### Claim 2 (depends on 1)

The separator of claim 1, wherein the hybrid coating layer further comprises an inorganic ceramic particle.

### Claim 3 (depends on 1)

The separator of claim 1, wherein a particle diameter D50 of the each polymer particle is in a range of 3 μm to 40 μm.

### Claim 4 (depends on 1)

The separator of claim 1, wherein a thickness of the shell of the each polymer particle is in a range of 0.5 μm to 6 μm.

### Claim 5 (depends on 1)

The separator of claim 1, wherein the each polymer particle has a swelling degree of 60% to 200% in the electrolyte.

### Claim 6 (depends on 1)

The separator of claim 1, wherein the shell of the each polymer particle is a homopolymer or a copolymer, and polymerization monomers of the shell of the each polymer particle are selected from the group consisting of methyl acrylate, methyl methacrylate, vinyl methacrylate, ethylene glycol dimethacrylate, acrylonitrile, and any combination thereof.

### Claim 7 (depends on 1)

The separator of claim 1, wherein an amount of the plurality of polymer particles is 10 wt. % to 80 wt. % based on a total weight of the hybrid coating layer, and an amount of the binder is 20 wt. % to 90 wt. % based on the total weight of the hybrid coating layer.

### Claim 8 (depends on 1)

The separator of claim 1, wherein the binder comprises a first binder and a second binder, a mass ratio of the first binder to the second binder is (85%-95%):(5%-15%), and a particle diameter D50 of the first binder is in a range of 0.3 μm to 0.5 μm.

### Claim 9 (depends on 8)

The separator of claim 8, wherein the first binder has a core and a shell surrounding the core, the core and the shell of the first binder are made of homopolymers or copolymers; wherein polymerization monomers of the core are selected from the group consisting of acrylate monomers, aromatic monovinyl compounds, acid anhydride, and any combination thereof, and polymerization monomers of the shell of the first binder are selected from the group consisting of acrylate monomers, aromatic monovinyl compounds, nitrile vinyl compounds, and any combination thereof.

### Claim 10 (depends on 8)

The separator of claim 8, wherein the first binder is made of a homopolymer or a copolymer, and polymerization monomers of the first binder are selected from the group consisting of acrylic acid, acrylate, butadiene, styrene, acrylonitrile, ethylene, chlorostyrene, fluorostyrene, propylene, and any combination thereof.

### Claim 11

A lithium-ion battery, comprising:
an electrolyte; and
an electrode assembly comprising:
a separator comprising a porous substrate and a hybrid coating layer, wherein the hybrid coating layer comprises a polymer and a binder, the polymer is formed by a plurality of polymer particles, and the plurality of polymer particles swell and damage when comes in contact with the electrolyte, and the polymer particle comprises a shell and a cavity defined in the shell, wherein the separator further comprises a ceramic coating layer coated on at least one surface of the porous substrate, and the hybrid coating layer is disposed on a surface of the ceramic coating layer and/or a surface of the porous substrate not coated with the ceramic coating layer.

### Claim 12 (depends on 11)

The lithium-ion battery of claim 11, wherein the hybrid coating layer further comprises an inorganic ceramic particle.

### Claim 13 (depends on 11)

The lithium-ion battery of claim 11, wherein a particle diameter D50 of the each polymer particle is in a range of 3 μm to 40 μm.

### Claim 14 (depends on 11)

The lithium-ion battery of claim 11, wherein a thickness of the shell of the each polymer particle is in a range of 0.5 μm to 6 μm.

### Claim 15 (depends on 11)

The lithium-ion battery of claim 11, wherein the each polymer particle has a swelling degree of 60% to 200% in the electrolyte.

### Claim 16 (depends on 11)

The lithium-ion battery of claim 11, wherein the shell of the each polymer particle is a homopolymer or a copolymer, and polymerization monomers of the shell of the each polymer particle are selected from the group consisting of methyl acrylate, methyl methacrylate, vinyl methacrylate, ethylene glycol dimethacrylate, acrylonitrile, and any combination thereof.

### Claim 17 (depends on 11)

The lithium-ion battery of claim 11, wherein an amount of the plurality of polymer particles is 10 wt. % to 80 wt. % based on a total weight of the hybrid coating layer, and an amount of the binder is 20 wt. % to 90 wt. % based on the total weight of the hybrid coating layer.

### Claim 18

An electronic device, comprising:
a lithium-ion battery comprising:
an electrolyte; and
an electrode assembly comprising:
a separator comprising a porous substrate and a hybrid coating layer, wherein the hybrid coating layer comprises a polymer and a binder, the polymer is formed by a plurality of polymer particles and the plurality of polymer particles swell and damage when comes in contact with the electrolyte, and the polymer particle comprises a shell and a cavity defined in the shell, wherein the separator further comprises a ceramic coating layer coated on at least one surface of the porous substrate, and the hybrid coating layer is disposed on a surface of the ceramic coating layer and/or a surface of the porous substrate not coated with the ceramic coating layer.