# US 7,410,510 B2 · Process of producing activated carbon for electrode of electric double layer capacitor

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- Number: US 7,410,510 B2
- Document ID: US7410510B2
- Status: Granted
- Kind: B2
- Application number: 10/571,061
- Filed: 2004-09-10
- Published: 2007-02-01
- Granted: 2008-08-12
- Earliest claimed: 2003-09-11
- Assignees: Honda Motor Co., Ltd.; Kuraray Chemical Co., Ltd.
- Inventors: Takeshi Fujino; Shushi Nishimura
- Web page: https://patentgrep.com/patent/US7410510B2

## CPC

- H01G 11/34: characterised by carbonisation or activation of carbon
- Y02E 60/13: Energy storage using capacitors
- 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)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A process for producing an activated carbon for an electrode of an electric double-layer capacitor, includes a step of subjecting a carbonized material to an alkali activating treatment, wherein the carbonized material has an average true specific gravity of 1.450 to 1.650 and a variation of the true specific gravities of 0.025 or less.

## Claims

### Claim 1

A process for producing an activated carbon for an electrode of an electric double-layer capacitor, comprising subjecting a carbonized material to an alkali activating treatment,
wherein the carbonized material has an average true specific gravity of 1.450 to 1.650 and a variation of the true specific gravity of 0.025 or less.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the variation is a difference between a maximum value and a minimum value of the true specific gravity.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising subjecting a raw carbon material to a carbonizing treatment so as to form the carbonized material,
wherein the carbonizing treatment is carried out in a furnace at a heating temperature of 600° C. to 1000° C., and the furnace has a temperature difference between an upper portion and a lower portion of the furnace of 1° C. to 50° C.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the temperature difference between the upper portion and the lower portion of the furnace is about 20° C.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the carbonizing treatment is carried out for 10 to 300 minutes in the furnace, and the furnace has a upper portion temperature of about 790° C., a middle portion temperature of about 780° C., and a lower portion temperature of about 770° C.

### Claim 6 (depends on 3)

The method according to claim 3, wherein the carbon material is a fiber aggregate having a thickness of 1 to 50 cm.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the thickness is 3 to 20 cm.