Patent ID: 8007755

Claim:
A method for forming a carbon fibrous structure having a plurality of granular parts to which a plurality of carbon fibers are bound, the method comprising: heating a mixture of a carbon source and a catalyst at a temperature between 800 ° C. and 1300 ° C. to produce aggregates of a first intermediate, wherein the plurality of granular parts are connected with each other through entanglement of the carbon fibers that extend outwardly from the granular parts, thereby forming a three dimensional network of carbon fibrous structure; heating the aggregates of the first intermediate to remove hydrocarbons, at a temperature between 800 ° C. and 1200 ° C. to produce aggregates of a first product; heating the aggregates of the first product at a temperature between 2400 ° C. and 3000 ° C. to produce aggregates of a final product; and pulverizing the aggregates of the final product such that area-based circle-equivalent mean diameter of each aggregate of the carbon fibrous structure of the product is 50-100μm, a bulk density of the carbon fibrous structure is 0.0001-0.02 g/cm 3 , and a powder resistance measured under a pressed density of 0.8g/cm 3 is not more than 0.02Ω·cm.