Electric double-layer capacitor

• US 7,785,495 B2
• Filed: 05/24/2006
• Issued: 08/31/2010
• Est. Priority Date: 05/27/2005
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Itahashi, Tamon, Kikuchi, Taketoshi
• Primary Examiner(s): Kopec; Mark
• Assistant Examiner(s): Nguyen; Khanh Tuan
• Application Number:
  US11/920,344
• Publication Number:
  US 20090103241A1
• Time in Patent Office: 1,560 Days
• Field of Search: 252/62.54, 252/500, 296/235, 525/502, 548/435
• US Class Current: 252/500
• CPC Class Codes: C01B 32/30 Active carbon
• CPC Class Codes: C01B 32/318 characterised by the starting materials
• CPC Class Codes: C08G 8/20 with polyhydric phenols
• CPC Class Codes: C08G 8/22 Resorcinol
• CPC Class Codes: H01G 11/06 with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
• CPC Class Codes: H01G 11/32 Carbon-based
• CPC Class Codes: H01G 11/34 characterised by carbonisation or activation of carbon
• CPC Class Codes: H01G 11/58 Liquid electrolytes
• CPC Class Codes: H01G 9/02 Diaphragms; Separators
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y10T 29/49115 including coating or impregnating

Abstract

An activated carbon comprising a carbonized and activated compound represented by the formula (1):

(wherein, R represents a hydrocarbon group having 1 to 12 carbon atoms, said hydrocarbon group may be optionally substituted with hydroxyl group, alkyl group, alkoxy group, aryl group, aryloxy group, sulfonyl group, halogen atoms, nitro group, thioalkyl group, cyano group, carboxyl group, amino group or amide group, R′ represents hydrogen atom or methyl group, and n represents an integer of 4, 6, or 8).

Claims

1. An activated carbon comprising a carbonized and activated compound represented by the formula (1):

2. The activated carbon according to claim 1, wherein R′

of the compound (1) is hydrogen atom.

3. The activated carbon according to claim 1, wherein the activated carbon has an alkali metal component or alkaline earth metal component in the amount of 100 ppm or less.

4. A method for producing an activated carbon comprising carbonizing and activating the compound represented by the formula (1) according to claim 1.

5. The method according to claim 4, wherein said carbonization and activation comprise calcining at a temperature of 200 to 1500°

C. in the presence of an oxidative gas.

6. The method according to claim 4, wherein said carbonization and activation comprise calcining at a temperature of 200 to 1500°

C. under an atmosphere of an inactive gas to carbon, and then further calcining at a temperature of 200 to 1500°

C. in the presence of an oxidative gas.

7. The method according to claim 4, wherein said carbonization and activation comprise calcining at 400°

C. or less in the presence of an oxidative gas, calcining at 1500°

C. or less under an atmosphere of an inactive gas to carbon, and then further calcining at 200 to 1500°

C. in the presence of H₂O or CO₂.

8. An electrode comprising the activated carbon according to claim 1.

9. The electrode according to claim 8, wherein R′

of the compound (1) is hydrogen atom.

10. The electrode according to claim 8, wherein the activated carbon has an alkali metal component or alkaline earth metal component in the amount of 100 ppm or less.

11. An electric double-layer capacitor comprising the electrode according to claim 8.

12. The electric double-layer capacitor according to claim 11 further comprising a separator and an electrolytic solution.

13. The electric double-layer capacitor according to claim 12, wherein the separator is at least one selected from the group consisting of papermakings, electrolytic papers, kraft papers, manila papers, mixed papermakings, polyethylene non-woven fabrics, polypropylene non-woven fabrics, polyester non-woven fabrics, Manila hemp sheets and glass fiber sheets.

14. The electric double-layer capacitor according to claim 12, wherein the electrolytic solution is an aqueous solution of sulfuric acid.

15. The electric double-layer capacitor according to claim 12, wherein the electrolytic solution comprises an organic quaternary cation, an inorganic anion and an organic polar solvent.