Porous carbon for electrochemical double layer capacitors

• US 8,482,900 B2
• Filed: 11/30/2010
• Issued: 07/09/2013
• Est. Priority Date: 11/30/2010
• Status: Active Grant

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Gadkaree, Kishor Purushottam, Liu, Jia
• Primary Examiner(s): Thomas, Eric
• Assistant Examiner(s): Ramaswamy, Arun
• Application Number:
  US12/956,061
• Publication Number:
  US 20120134070A1
• Time in Patent Office: 952 Days
• Field of Search: 361/502, 502/416, 264/105, 423/445.R
• US Class Current: 361/502
• CPC Class Codes: C01B 32/324 from waste materials, e.g. tyres or spent sulfite pulp liquor
• CPC Class Codes: C01B 32/342 characterised by non-gaseous activating agents
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C01P 2006/14 Pore volume
• CPC Class Codes: C01P 2006/16 Pore diameter
• CPC Class Codes: C01P 2006/40 Electric properties
• CPC Class Codes: H01G 11/24 characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor
• CPC Class Codes: H01G 11/32 Carbon-based
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

An electrochemical double layer capacitor electrode comprising microporous carbon, wherein the microporous carbon comprises a median pore width of 1.2 nanometers or less, and a ratio of BET surface area to total pore volume greater than 2200 m²/cm³.

Claims

1. An electrochemical double layer capacitor electrode comprising microporous carbon, wherein the microporous carbon comprises:

a median pore width of 1.2 nanometers or less;

a ratio of BET surface area to total pore volume greater than 2400 m²/cm³;

pores having a size of ≦

1 nm, which provide a combined pore volume of ≧

0.3 cm³/g;

pores having a size of from >

1 nm to ≦

2 nm, which provide a combined pore volume of ≧

0.05 cm³/g; and

<

0.15 cm³/g combined pore volume of any pores having a size of >

2 nm.

2. An electrochemical double layer capacitor electrode of claim 1, wherein the ratio of BET surface area to total pore volume is from 2400 m²/cm³ to 20,000 m²/cm³.

3. An electrochemical double layer capacitor electrode of claim 1, wherein the ratio of BET surface area to pore volume is from 2400 m²/cm³ to 3500 m²/cm³.

4. An electrochemical double layer capacitor electrode of claim 1, wherein the BET surface area of the microporous carbon is greater than 1000 m²/g.

5. An electrochemical double layer capacitor electrode of claim 1, wherein the BET surface area of the microporous carbon is greater than 2100 m²/g.

6. An electrochemical double layer capacitor electrode of claim 1, wherein the total pore volume is from 0.2 to 1.5 cm³/g.

7. An electrochemical double layer capacitor electrode of claim 1, wherein the total pore volume is from 0.4 to 1.0 cm³/g.

8. An electrochemical double layer capacitor electrode of claim 1, wherein the median pore width is 1.0 nanometers or less.

9. An electrochemical double layer capacitor electrode of claim 1, wherein the median pore width is 0.8 nanometers or less.

10. An electrochemical double layer capacitor electrode of claim 1, having a volumetric specific capacitance greater than 90 F/cc.

11. An electrochemical double layer capacitor electrode of claim 1, having a volumetric specific capacitance greater than 80 F/cc.

12. An electrochemical double layer capacitor electrode of claim 1, wherein the microporous carbon is incorporated into a sheet having a thickness of about 100-300 microns.