# US 2021/0280947 A1 · Coating Liquid for Use in Lithium Ion Battery, Lithium Ion Battery Separator, and Lithium Ion Battery

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- Number: US 2021/0280947 A1
- Document ID: US20210280947A1
- Status: Published application
- Kind: A1
- Application number: 17/255,809
- Filed: 2019-05-23
- Published: 2021-09-09
- Earliest claimed: 2018-08-28
- Assignees: Shenzhen Senior Technology Material Co., Ltd.; Jiangsu Senior New Material Technology Co., Ltd
- Applicants: Shenzhen Senior Technology Material Co., Ltd.; Jiangsu Senior New Material Technology Co., Ltd
- Inventors: Yanjie WANG; Zhijie WU; Bin TAN; Li CHEN
- Web page: https://patentgrep.com/patent/US20210280947A1

## CPC

- H01M 50/454: comprising a non-fibrous layer and a fibrous layer superimposed on one another
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 50/40: Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M 50/403: Manufacturing processes of separators, membranes or diaphragms
- H01M 50/417: Polyolefins
- H01M 50/434: Ceramics
- H01M 50/44: Fibrous material
- H01M 50/443: Particulate material
- H01M 50/451: comprising layers of only organic material and layers containing inorganic 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 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
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Disclosed are a coating liquid of a lithium ion battery separator, a lithium ion battery separator, and a lithium ion battery. The raw materials of the coating liquid include a nanowire, ceramic powder, an adhesive, and a solvent; the nanowire is at least one of nano cellulose, carbon nanotube, silver nanowire, boron carbide nanowire, copper hydroxide nanowire, aramid nano fiber, silicon monoxide nanowire, and hydroxyapatite nanowire; the diameter of the nanowire is 1-100 nm, and the length is 0.1-100 μm. The lithium ion battery separator consisting of a separator body and a coating layer loaded on the separator body is obtained by applying the coating liquid that is obtained by mixing the nanowire, the ceramic powder, the adhesive and the like onto the surface of the separator body, and performing curing; the lithium ion battery has good thermal stability and puncture resistance, etc.

## Claims

### Claim 1

A coating liquid for a lithium ion battery separator, wherein the coating liquid comprises: a nanowire, ceramic powder, an adhesive and a solvent,
wherein the nanowire is at least one selected from the group consisting of nano cellulose, carbon nanotube, silver nanowire, boron carbide nanowire, copper hydroxide nanowire, aramid nano fiber, silicon monoxide nanowire and hydroxyapatite nanowire; and the nanowire has a diameter of 1˜100 nm, and a length of 0.1˜100 μm.

### Claim 2 (depends on 1)

The coating liquid for a lithium ion battery separator according to claim 1, wherein the ceramic powder is at least one selected from the group consisting of aluminum oxide, silicon oxide, titanium oxide, boehmite and attapulgite, and the ceramic powder has a particle size of 5˜1000 nm.

### Claim 3 (depends on 1)

The coating liquid for a lithium ion battery separator according to claim 1, wherein a mass ratio of the ceramic powder to the nanowire is 0.1:1˜5:1.

### Claim 4 (depends on 1)

The coating liquid for a lithium ion battery separator according to claim 1, wherein a mass of the nanowire accounts for 1˜30% of a mass of the solvent.

### Claim 5 (depends on 1)

The coating liquid for a lithium ion battery separator according to claim 1, wherein a mass of the adhesive accounts for 1˜50% of a mass of the solvent.

### Claim 6 (depends on 1)

The coating liquid for a lithium ion battery separator according to claim 1, wherein raw materials of the coating liquid further comprise an adjuvant, wherein a mass of the adjuvant accounts for 0.01˜3% of a mass of the solvent.

### Claim 7 (depends on 1)

The coating liquid for a lithium ion battery separator according to claim 1, wherein the adhesive is at least one selected from the group consisting of polyvinyl alcohol, polyacrylonitrile, polyacrylic acid, styrene-butadiene rubber, carboxymethyl cellulose, polyvinylidene fluoride, polyvinyl pyrrolidone and polyimide.

### Claim 8 (depends on 1)

The coating liquid for a lithium ion battery separator according to claim 1, wherein the solvent comprises at least one selected from the group consisting of water, ethanol, acetone and N-methylpyrrolidone.

### Claim 9 (depends on 6)

The coating liquid for a lithium ion battery separator according to claim 6, wherein the adjuvant is at least one selected from the group consisting of fluoroalkyl ethoxy alcohol ether, fatty alcohol polyoxyethylene ether, sodium butylbenzene naphthalene sulfonate, hydroxyethyl sodium sulfate and lauryl sodium sulfate.

### Claim 10 (depends on 1)

A lithium ion battery separator, comprising a separator body and a coating layer loaded on the separator body, wherein the coating layer is obtained by coating the coating liquid according to claim 1 on at least one side surface of the separator body, and curing the coating liquid.

### Claim 11 (depends on 10)

The lithium ion battery separator according to claim 10, wherein the coating is carried out in a manner of dip coating, spray coating, spin coating, roller coating or blade coating.

### Claim 12 (depends on 10)

The lithium ion battery separator according to claim 10, wherein the separator body is a polypropylene microporous film, a polyethylene microporous film or a polypropylene/polyethylene microporous film.

### Claim 13 (depends on 10)

The lithium ion battery separator according to claim 10, wherein the separator body has a thickness of 3˜20 μm.

### Claim 14 (depends on 10)

The lithium ion battery separator according claim 10, wherein the coating layer has a thickness of 0.01˜1 μm.

### Claim 15 (depends on 10)

A lithium ion battery, wherein the lithium ion battery comprises the lithium ion battery separator according to claim 10.

### Claim 16 (depends on 2)

The coating liquid for a lithium ion battery separator according to claim 2, wherein a mass ratio of the ceramic powder to the nanowire is 0.1:1˜5:1.

### Claim 17 (depends on 2)

The coating liquid for a lithium ion battery separator according to claim 2, wherein a mass of the nanowire accounts for 1˜30% of a mass of the solvent.

### Claim 18 (depends on 2)

The coating liquid for a lithium ion battery separator according to claim 2, wherein a mass of the adhesive accounts for 1˜50% of a mass of the solvent.

### Claim 19 (depends on 2)

The coating liquid for a lithium ion battery separator according to claim 2, wherein raw materials of the coating liquid further comprise an adjuvant, wherein a mass of the adjuvant accounts for 0.01˜3% of a mass of the solvent.

### Claim 20 (depends on 2)

The coating liquid for a lithium ion battery separator according to claim 2, wherein the adhesive is at least one selected from the group consisting of polyvinyl alcohol, polyacrylonitrile, polyacrylic acid, styrene-butadiene rubber, carboxymethyl cellulose, polyvinylidene fluoride, polyvinyl pyrrolidone and polyimide.