Patent ID: 9406936
Filing Date: 2016-08-02
CPC Classification: C01B,H01M,Y02E,Y02T

Claim Text:
1. A carbon material, which contains boron atom in an amount of 0.001 to 0.5 mass %, in which the average interplanar spacing d002 of plane (002) by the X-ray diffraction method is 0.337 nm or less; and by observing the optical structures in the cross-section of the formed body made of the carbon material in a rectangular field of 480 μm×540 μm under a polarizing microscope, when areas of the optical structures are accumulated from a smallest structure in an ascending order, SOP represents an area of an optical structure whose accumulated area corresponds to 60% of the total area of all the optical structures; when the structures are counted from a structure of a smallest aspect ratio in an ascending order, AROP represents the aspect ratio of the structure which ranks at the position of 60% in the total number of all the structures; and when D50 represents a volume-based average particle diameter by laser diffraction method; SOP, AROP and D50 satisfy the following relationship: