# US 12,603,387 B2 · Separator and application thereof

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- Number: US 12,603,387 B2
- Document ID: US12603387B2
- Status: Granted
- Kind: B2
- Application number: 18/152,964
- Filed: 2023-01-11
- Published: 2023-07-20
- Granted: 2026-04-14
- Earliest claimed: 2022-01-14
- Assignees: Microcosm Technology Co., Ltd.
- Applicants: Microcosm Technology Co., Ltd.
- Inventors: Chun-Ting Yeh; Chia Yun Wang; Sih-Ci Jheng
- Web page: https://patentgrep.com/patent/US12603387B2

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/414: Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M 8/103: having nitrogen, e.g. sulfonated polybenzimidazoles [S-PBI], polybenzimidazoles with phosphoric acid, sulfonated polyamides [S-PA] or sulfonated polyphosphazenes [S-PPh]
- H01M 8/1046: Mixtures of at least one polymer and at least one additive
- H01M 8/188: {by recharging of redox couples containing fluids; Redox flow type batteries}
- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 50/403: Manufacturing processes of separators, membranes or diaphragms
- H01M 50/411: Organic material
- H01M 50/434: Ceramics
- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- H01M 2008/1095: {Fuel cells with polymeric electrolytes}
- H01M 2300/0091: in the form of mixtures
- Y02E 60/10: Energy storage using batteries
- Y02E 60/50: Fuel cells
- 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

The present invention provides a separator formed by hydrolysis of a resin film. The resin film comprises a non-hydrolyzable organic polymer; and a hydrolyzable organic polymer being hydrolyzable by treatment with at least one of an acid aqueous solution, an alkaline aqueous solution and pure water, wherein the content of the hydrolyzable organic polymer ranges from 10 parts by weight to 70 parts by weight relative to 100 parts by weight of the resin film. The separator of the present invention has good ion conductivity and thus, is extremely suitable for use in various types of batteries.

## Claims

### Claim 1

A separator formed by hydrolysis of a resin film, wherein the resin film comprises:
a non-hydrolyzable organic polymer comprising polybenzimidazole, polybenzoxazole, polybenzothiazole, polyetherketone, polyphenylene ether, polyethersulfone, polysulfone, polyphenylene sulfide, polypropylene, polyethylene, polystyrene or a combination thereof; and
a hydrolyzable organic polymer being hydrolyzable with treatment of at least one of an aqueous acid solution, an aqueous alkaline solution and pure water,
wherein a content of the hydrolyzable organic polymer ranges from 10 parts by weight to 70 parts by weight, based on 100 parts by weight of the resin film, and the hydrolyzable organic polymer includes a repeating unit represented by formula (1):
wherein X1 is a tetravalent group comprising at least one aromatic or alicyclic group; Y1 is a divalent group comprising at least one aromatic or alicyclic group, and at least one of X1 and Y1 comprises at least one functional group structure among an ester bond, an amide bond, a sulfonic acid group, a phosphoric acid group, a carboxylic acid group, a hydroxyl group and a nitro group.

### Claim 2 (depends on 1)

The separator of claim 1, wherein the non-hydrolyzable organic polymer has a hydrophilic functional group in the side chain.

### Claim 3 (depends on 2)

The separator of claim 2, wherein the hydrophilic functional group comprises a sulfonic acid group, a phosphoric acid group, a carboxylic acid group, an amide group or a hydroxyl group.

### Claim 4 (depends on 1)

The separator of claim 1, wherein X1 is selected from the tetravalent groups represented by formula (2), formula (3), formula (4), formula (5), or formula (6):
wherein R1 independently represents —H, —F, —CF3, —SO3H, —PO3H2, —COOH, —OH, a linear or branched chain alkyl with 1 to 6 carbon atoms or phenyl; R2 independently represents a linear or branched chain hydrocarbon group with 2 to 36 carbon atoms or a cyclic hydrocarbon group with 3 to 20 carbon atoms; R3 independently represents —H, —F, —CF3, —SO3H, —PO3H2, —COOH, —OH, a linear or branched chain hydrocarbon group with 1 to 6 carbon atoms; L1 independently represents —O—, —S—, —SO2—, a single bond, —NH—, —C(═O)—, —CH═CH—, —C≡C—, —CH2—, —(CH2)2—, —C(CH3)2—, —C(CF3)2—, —C(═O)O—, —OC(═O)—, —C(═O)NH— or —NHC(═O)—; n independently represents an integer from 0 to 5; and m represents an integer from 1 to 5.

### Claim 5 (depends on 1)

The separator of claim 1, wherein Y1 is the divalent group represented by formula (7), formula (8), or formula (9):
wherein L2 independently represents —O—, —S—, —SO2—, a single bond, —NH—, —C(═O)—, —CH═CH—, —C≡C—, —CH2—, —(CH2)2—, —C(CH3)2—, —C(CF3)2—, —C(═O)O—, —OC(═O)—, —C(═O) NH— or —NHC(═O)—; R4 independently represents —H, —F, —CF3, —SO3H, —PO3H2, —COOH, —OH, a linear or branched chain hydrocarbon group with 1 to 6 carbon atoms or phenyl; R5 independently represents —H, —F, —CF3, —SO3H, —PO3H2, —COOH, —OH, a linear or branched chain hydrocarbon group with 1 to 6 carbon atoms or phenyl; R6 and R7 independently represent a linear or branched chain hydrocarbon group with 1 to 9 carbon atoms; and n represents an integer from 0 to 5.

### Claim 6 (depends on 1)

The separator of claim 1, wherein the separator has an elongation at break of greater than 10%.

### Claim 7 (depends on 1)

The separator of claim 1, wherein the separator has a thickness of 0.1 μm to 100 μm.

### Claim 8 (depends on 1)

The separator of claim 1, wherein the resin film further comprises a filler, the content of which is greater than 0 part by weight and not more than 60 parts by weight, based on 100 parts by weight of the resin film.

### Claim 9 (depends on 8)

The separator of claim 8, wherein the filler is selected from a flame retardant, a hydrophilic material composed of an acidic substance and an alkaline substance, a ceramic oxide, a lithium salt, an organic acid, an ionic liquid or a combination thereof.

### Claim 10 (depends on 1)

The separator of claim 1, wherein the resin film is formed from a composition comprising the non-hydrolyzable organic polymer, the hydrolyzable organic polymer, and an organic solvent.

### Claim 11 (depends on 1)

A combination film comprising the separator of claim 1.

### Claim 12 (depends on 1)

A battery comprising:
an anode layer;
a cathode layer; and
the separator of claim 1 disposed between the anode layer and the cathode layer.

### Claim 13 (depends on 12)

The battery of claim 12 comprising a fuel cell, a flow battery, or a lithium battery.