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Gold/Mining/Energy : AXPW - Axion Power (Bulls Board)
AXPW 0.00400-4.8%Aug 14 4:00 PM EDT
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From: donpat6/28/2012 10:37:26 AM
   of 38
 
(WO2012087497) POROUS CARBON FOR ELECTROCHEMICAL DOUBLE LAYER CAPACITORS

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.

What is claimed is:

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; and

a ratio of BET surface area to total pore volume greater than 2200 m2/cm3.

SUMMARY

[0006] The performance of EDLCs comprising carbon based electrodes can be intimately related to the properties of the carbon. Disclosed herein is an improved level of understanding regarding activated carbon materials and their use in EDLCs. The carbon materials disclosed herein have a structure defined by the ratio of total BET surface area to total pore volume, independent of the type of activated carbon. In this disclosure, it is demonstrated that a ratio of total BET surface area to total pore volume of microporous carbon correlates to EDLC performance. Disclosed is a microporous carbon comprising median pore width of 1.2 nanometer or less and a ratio of total BET surface area to total pore volume from 2200 m2/cm3 to 20,000 m2/cm3.

patentscope.wipo.int
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