# US 12,218,305 B2 · Graphene compound, method for forming graphene compound, and lithium-ion storage battery

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- Number: US 12,218,305 B2
- Document ID: US12218305B2
- Status: Granted
- Kind: B2
- Application number: 17/334,514
- Filed: 2021-05-28
- Published: 2021-09-23
- Granted: 2025-02-04
- Earliest claimed: 2016-03-02
- Assignees: Semiconductor Energy Laboratory Co., Ltd.
- Applicants: Semiconductor Energy Laboratory Co., Ltd.
- Inventors: Hiroshi Kadoma; Teppei Oguni; Satoshi Seo
- Web page: https://patentgrep.com/patent/US12218305B2

## CPC

- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- C01B 32/194: After-treatment
- C01B 32/198: Graphene oxide
- C01B 32/23: Oxidation
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 50/119: Metals
- H01M 50/121: Organic material
- H01M 50/129: with two or more layers of only organic material
- C01B 2204/22: Electronic properties
- H01M 2300/0082: Organic polymers
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A material that can be used in a wide temperature range is provided. A graphene compound includes graphene or graphene oxide and a substituted or unsubstituted chain group, the chain group includes two or more ether bonds, and the chain group is bonded to the above graphene or graphene oxide through a Si atom. Alternatively, a method for forming a graphene compound includes a first step and a second step after the first step. In the first step, graphene oxide and a base are stirred under a nitrogen stream. In the second step, the mixture is cooled to room temperature, a silylating agent that has a group having two or more ether bonds is introduced into the mixture, and the obtained mixture is stirred. The base is butylamine, pentylamine, hexylamine, diethylamine, dipropylamine, dibutylamine, triethylamine, tripropylamine, or pyridine.

## Claims

### Claim 1

A method for forming a graphene compound, comprising the steps of:
stirring graphene oxide and a base under a nitrogen stream to form a first mixture;
cooling the first mixture after the stirring step; and
adding a silylating agent to the first mixture after the cooling, to form a second mixture,
wherein the silylating agent further comprises a chain group comprising two or more ether bonds,
wherein the chain group has a structure terminated with an alkoxyalkyl group, and
wherein the base is any one of butylamine, pentylamine, hexylamine, diethylamine, dipropylamine, dibutylamine, triethylamine, tripropylamine and pyridine.

### Claim 2 (depends on 1)

The method for forming a graphene compound according to claim 1, wherein the chain group comprises 2 to 20 ether bonds.

### Claim 3 (depends on 1)

The method for forming a graphene compound according to claim 1, wherein the chain group comprises 4 to 20 ether bonds.

### Claim 4 (depends on 1)

The method for forming a graphene compound according to claim 1, wherein a length in the longitudinal direction of the graphene oxide is greater than or equal to 50 nm and less than or equal to 100 μm.

### Claim 5 (depends on 1)

The method for forming a graphene compound according to claim 1, wherein the chain group is a straight chain.

### Claim 6 (depends on 1)

The method for forming a graphene compound according to claim 1, wherein the silylating agent is 2-[methoxy(polyethyleneoxy)6-9propyl]trichlorosilane.