# US 12,015,169 B2 · Method of manufacturing separator

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,015,169 B2
- Document ID: US12015169B2
- Status: Granted
- Kind: B2
- Application number: 17/370,160
- Filed: 2021-07-08
- Published: 2022-12-01
- Granted: 2024-06-18
- Earliest claimed: 2021-05-25
- Assignees: Unicoh Specialty Chemicals Co., Ltd.
- Applicants: Unicoh Specialty Chemicals Co., Ltd.
- Inventors: Bang Cha Rang Song; Lyong Jin Lee; Yoo Chul Kim
- Web page: https://patentgrep.com/patent/US12015169B2

## CPC

- H01M 8/0221: Organic resins; Organic polymers
- H01M 50/406: Moulding; Embossing; Cutting
- H01M 8/0213: Gas-impermeable carbon-containing materials
- H01M 8/0226: in the form of mixtures
- H01M 8/188: {by recharging of redox couples containing fluids; Redox flow type batteries}
- H01M 50/431: Inorganic material
- H01M 50/443: Particulate material
- H01M 50/497: Ionic conductivity
- H01M 10/052: Li-accumulators
- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- 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

In one embodiment of the present invention, it is provided a method of manufacturing a separator comprising: preparing expansion graphite; pulverizing the expansion graphite; mixing the expansion graphite and polymer; and forming a separator by molding the mixture.

## Claims

### Claim 1

A method of manufacturing a separator comprising:
preparing expansion graphite;
pulverizing the expansion graphite;
mixing the expansion graphite and polymer; and
forming a separator by molding the mixture,
wherein after the step of pulverizing the expansion graphite but before the step of mixing the pulverized expansion graphite and polymer, a step of high temperature heat treatment of the pulverized expansion graphite is performed, and
wherein the S content of the heat treated pulverized expansion graphite is 0.84 wt % to 1.30 wt %.

### Claim 2 (depends on 1)

The method of claim 1, wherein the step of pulverizing the expansion graphite is performed that the expansion graphite is pulverized to a particle size of 60 to 300 μm (based on D50).

### Claim 3 (depends on 1)

The method of claim 1, wherein the pulverized expansion graphite has a tap density in the range of 0.008 to 0.03 g/ml.

### Claim 4 (depends on 1)

The method of claim 1, wherein the high temperature heat treatment step is carried out at 500 to 1,000° C.

### Claim 5 (depends on 1)

The method of claim 1, wherein the conductivity of the separator is in the range of 800 to 1500 S/cm.

### Claim 6 (depends on 1)

The method of claim 1, wherein after mixing the pulverized expansion graphite and polymer, the method further comprises a step of low temperature heat treatment of the mixture.

### Claim 7 (depends on 6)

The method of claim 6, wherein the temperature of the low temperature heat treatment step is in the range of 50 to 250° C.