Patent ID: 6060424
Filing Date: 2000-05-09
Classification: C01B,H01G,H01M,Y02E

Abstract:
A process for producing carbons for use in high energy carbon double layer capacitors comprising the steps of:(a) blending together fragments of a lignocellulosic material with an activating agent;(b) activating the lignocellulosic material; and(c) wherein the improvement comprises heating, under a gas atmosphere selected from the group consisting of inert gases, flue gases and combinations thereof, the activated lignocellulosic material to a temperature from about 900.degree. C. to about 1120.degree. C. in a densification step to produce an activated carbon with a pore volume of greater than about 0.45 cc/g, a median pore width of less than 2.0 nm, a specific surface area of greater than about 500 m.sup.2 /g, a micropore content, based on the total pore volume, of greater than about 75%, and a total combined mesopore and macropore content, based on the total pore volume, of less than about 25%.