# US 12,183,477 B2 · Power storage device

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

- Number: US 12,183,477 B2
- Document ID: US12183477B2
- Status: Granted
- Kind: B2
- Application number: 16/991,320
- Filed: 2020-08-12
- Published: 2020-12-24
- Granted: 2024-12-31
- Earliest claimed: 2011-08-26
- Assignees: Semiconductor Energy Laboratory Co., Ltd.
- Applicants: Semiconductor Energy Laboratory Co., Ltd.
- Inventors: Junpei Momo; Hiroatsu Todoriki; Kuniharu Nomoto
- Web page: https://patentgrep.com/patent/US12183477B2

## CPC

- H01B 1/04: mainly consisting of carbon-silicon compounds, carbon or silicon
- C01B 32/23: Oxidation
- H01G 11/06: with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
- H01G 11/32: Carbon-based
- H01G 11/38: Carbon pastes or blends; Binders or additives therein
- H01G 11/86: specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34)
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/587: for inserting or intercalating light metals
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/058: Construction or manufacture
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- Y02E 60/10: Energy storage using batteries
- Y02E 60/13: Energy storage using capacitors
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A power storage device with high output is provided, in which the specific surface area is increased while keeping the easy-to-handle particle size of its active material. The power storage device includes a positive electrode including a positive electrode current collector and a positive electrode active material layer, a negative electrode including a negative electrode current collector and a negative electrode active material layer, and an electrolyte. The negative electrode active material layer includes a negative electrode active material which is a particle in which a plurality of slices of graphite is overlapped with each other with a gap therebetween. It is preferable that the grain diameter of the particle be 1 μm to 50 μm. Further, it is preferable that the electrolyte be in contact with the gap between the slices of graphite.

## Claims

### Claim 1

A method for manufacturing a carbon material, comprising the steps of:
preparing a first solution comprising a graphite and water;
adding an oxidizer to the first solution to produce a graphite oxide in the first solution;
deactivating the oxidizer in the first solution after producing the graphite oxide;
cleaning the graphite oxide by a first acid after deactivating the oxidizer;
adding a base to the graphite oxide in order to obtain a second solution after cleaning the graphite oxide;
adding an organic solvent to the second solution comprising the water and the base after adding the base; and
isolating the graphite oxide in the second solution after adding the organic solvent.

### Claim 2 (depends on 1)

The method for a carbon material according to claim 1, wherein isolating the graphite oxide is performed by suction filtration.

### Claim 3 (depends on 1)

The method for manufacturing a carbon material according to claim 1, further comprising the step of:
cleaning the isolated graphite oxide by adding a second acid and performing filtration.

### Claim 4 (depends on 1)

The method for manufacturing a carbon material according to claim 1, further comprising the step of:
foliating the graphite oxide by applying ultrasonic waves.

### Claim 5 (depends on 1)

The method for manufacturing a carbon material according to claim 1, wherein the first solution comprises concentrated sulfuric acid as a solvent.

### Claim 6 (depends on 5)

The method for manufacturing a carbon material according to claim 5, wherein the oxidizer is potassium permanganate.

### Claim 7

A method for manufacturing a carbon material, comprising the steps of:
preparing a first solution comprising a graphite and concentrated sulfuric acid;
adding potassium permanganate to the first solution to produce a graphite oxide in the first solution;
adding water to the first solution after producing the graphite oxide to obtain a first aqueous solution;
deactivating the potassium permanganate in the first aqueous solution;
cleaning the graphite oxide by a first acid after deactivating the potassium permanganate;
adding a base to the graphite oxide in order to obtain a second aqueous solution after cleaning the graphite oxide;
adding an organic solvent to the second aqueous solution after adding the base; and
isolating the graphite oxide after adding the organic solvent.

### Claim 8 (depends on 7)

The method for a carbon material according to claim 7, wherein isolating the graphite oxide is performed by suction filtration.

### Claim 9 (depends on 7)

The method for manufacturing a carbon material according to claim 7, further comprising the step of:
cleaning the isolated graphite oxide by adding a second acid and performing filtration.

### Claim 10 (depends on 7)

The method for manufacturing a carbon material according to claim 7, further comprising the step of:
foliating the graphite oxide by applying ultrasonic waves.

### Claim 11 (depends on 7)

The method for manufacturing a carbon material according to claim 7, wherein the base is an ammonia aqueous solution.

### Claim 12 (depends on 7)

The method for manufacturing a carbon material according to claim 7, wherein the organic solvent is acetone.

### Claim 13 (depends on 7)

The method for manufacturing a carbon material according to claim 7, wherein a precipitate formed by adding the organic solvent to the second aqueous solution comprises the graphite oxide.