# US 2017/0288192 A1 · Lithium Ion Battery and Separator Thereof

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- Number: US 2017/0288192 A1
- Document ID: US20170288192A1
- Status: Published application
- Kind: A1
- Application number: 15/475,167
- Filed: 2017-03-31
- Published: 2017-10-05
- Earliest claimed: 2016-04-01
- Assignees: Ningde Amperex Technology Limited
- Applicants: Ningde Amperex Technology Limited
- Inventors: Shitong Chen; Xinghua Tao; Shengwu Zhang; Wenqiang Cheng
- Web page: https://patentgrep.com/patent/US20170288192A1

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- 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 50/423: Polyamide resins
- H01M 50/426: Fluorocarbon polymers
- H01M 50/443: Particulate material
- H01M 50/449: having a layered structure
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/457: comprising three or more layers
- H01M 50/434: Ceramics
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention provides a separator for a lithium ion battery. The separator includes a substrate, an inorganic coating on at least one surface of the substrate, and an organic coating on at least one surface of the inorganic coating, wherein the coating density of the organic coating is 0.1 mg/1540.25 mm2˜10 mg/1540.25 mm2. Compared with the prior art, the separator of the present invention can improve the deformation of the lithium ion battery and enhance the expansion force that the lithium ion battery can endure, thereby improving the cycle life of the lithium ion battery. In addition, the present invention also provides a lithium ion battery having the separator of the present invention.

## Claims

### Claim 1

A separator for a lithium ion battery, comprising a substrate and an organic coating disposed directly or indirectly on at least one surface of the substrate, wherein a coating density of the organic coating is 0.1 mg/1540.25 mm2˜10 mg/1540.25 mm2.

### Claim 2 (depends on 1)

The separator of claim 1, wherein the organic coating comprises organic polymer particles and/or organic polymer emulsion and binder.

### Claim 3 (depends on 2)

The separator of claim 2, wherein a particle size D50 of the organic polymer particles and/or organic polymer emulsion is 1 μm˜150 μm, and crystallinity of the organic polymer particles and/or organic polymer emulsion is less than 85%.

### Claim 4 (depends on 2)

The separator of claim 2, wherein a weight content of the organic polymer particles and/or organic polymer emulsion is 5%˜95% and a weight content of the binder is 5%˜95%.

### Claim 5 (depends on 2)

The separator of claim 2, wherein the organic polymer particles and/or organic polymer emulsion are selected from a group consisting of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene polymer, styrene butadiene polymer and polyacrylic acid, and the binder is selected from a group consisting of polyamide, polyacrylonitrile, polyacrylic ester, polyacrylate, hydroxy methyl cellulose, polyvinyl pyrrolidone, ethyl acetate, phenyl ether, polyvinyl ether, vinyl carbonate, glycerol polyglycidyl ether, propylene carbonate, acetone, and pure acrylic emulsion.

### Claim 6 (depends on 1)

The separator of claim 1, wherein the substrate is PE, PP, non-woven fabrics, PET, PVDF, PU, PA, PI, organic and inorganic blend membrane, or PP/PE/PP.

### Claim 7 (depends on 1)

The separator of claim 1, wherein at least one surface of the substrate is coated with an inorganic coating, the organic coating is disposed on at least one surface of the inorganic coating, and the organic coating has a gap providing ability of 1˜150 μm for a winded and heat pressed battery cell.

### Claim 8 (depends on 7)

The separator of claim 7, wherein the organic coating covers 1%˜95% of the surface of the substrate or the inorganic coating.

### Claim 9 (depends on 7)

The separator of claim 7, wherein the inorganic coating comprises inorganic particles and binder, a weight content of the inorganic particles is 5˜95 wt %, and a weight content of the binder is 5˜95 wt %.

### Claim 10 (depends on 1)

A lithium ion battery, comprising a cathode plate, an anode plate, a separator between the cathode plate and the anode plate, wherein the separator is the separator of claim 1.