Activated carbon and electric double layer capacitor thereof

Patent metadata

Field	Value
Publication number	US-2016172122-A1
Application number	US-201414568333-A
Country	US
Kind code	A1
Filing date	Dec 12, 2014
Priority date	Dec 12, 2014
Publication date	Jun 16, 2016
Grant date	—

Abstract

An activated carbon composition having a relatively high transition metal content and a low covalent oxygen as defined herein. Also disclosed is a method of making and using the disclosed activated carbon composition, and an EDLC article incorporating the activated carbon composition.

First claim

What is claimed is:

1 . An activated carbon composition, comprising:
a chemically bonded oxygen content of from 0.05 to 0.7 wt %; and a total transition metal content of from 70 to 300 ppm.

2 . The composition of claim 1 wherein the total transition metal content is from 70 to 200 ppm.

3 . The composition of claim 1 wherein the total oxygen content is from 0.05 to 0.4 wt %.

4 . The composition of claim lwherein the total transition metal content is from 70 to 200 ppm, and the total oxygen content is from 0.05 to 0.4 wt %.

5 . The composition of claim 1 wherein the total transition metal content comprises: Fe of from 60 to 90 ppm; Cu of from 50 to 70 ppm; Cr of from 1 to 5 ppm; Mn of from 1 to 5 ppm; and Ni of from 1 to 5 ppm.

6 . The composition of claim 1 wherein the physically activated carbon has a total pore volume of from 0.40 to 0.55 cm 3 /g; and a surface area of from 1350 to 1600 m 2 /g.

7 . An EDLC article, comprising:
at least one electrode comprising the activated carbon composition of claim 1 .

8 . The article of claim 7 wherein in a 2.7V and 65° C. stress test at 1500 hours:
the normalized capacitance of the article is at least 80%;
the normalized ESR of the article is unchanged (e.g., constant) ; and
the beginning of life (BOL) capacitance of the article is from 60 to 70 F/cc.

9 . The article of claim 7 wherein the normalized capacitance is 80 to 90%.

10 . The article of claim 7 wherein the normalized capacitance is 85%.

11 . The article of claim 7 wherein the normalized capacitance at 1900 hours is 85%.

12 . The article of claim 7 wherein the energy density and power density of the article is insensitive to the total transition metal content of the activated carbon.

Assignees

• Corning Inc

Inventors

• Kumar Atul
• Liu Jia
• Reddy Kamjula Pattabhirami

Classifications

• C01B32/336 Primary

  characterised by gaseous activating agents · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01G11/44

  Raw materials therefor, e.g. resins or coal · CPC title

• H01G11/32 Primary

  Carbon-based · CPC title

• H01G11/42

  Powders or particles, e.g. composition thereof · CPC title