NOVELTY - A carbon material (10) comprises a primary layer (1) containing 100 parts mass of resin composition (A) containing polyolefin resin and having a melt flow rate of 0.01-10g/10 minutes, and 100-1000 parts mass of carbonaceous material (c1), a secondary layer (2) containing 100 parts mass of resin composition (B) containing polyolefin resin, and having a melt flow rate of 5-1000 g/10 minutes which is more than that of resin composition (A), and 100-1000 parts mass carbonaceous material (c2), and a tertiary layer (3) comprising porous carbon material.    USE - Carbon material is used as battery material for manufacturing redox flow cell and fuel cell (all claimed).    ADVANTAGE - The carbon material has excellent electroconductivity and bending strength. The redox flow cell containing the carbon material has excellent workability. The fuel cell is manufactured with high productivity by a simple process.    DETAILED DESCRIPTION - A carbon material comprises a primary layer containing 100 parts mass of resin composition (A) containing polyolefin resin and having a melt flow rate of 0.01-10g/10 minutes measured under 2.16 kg of load at 230 degrees C, and 100-1000 parts mass of carbonaceous material (c1), a secondary layer containing 100 parts mass of resin composition (B) containing polyolefin resin, and having a melt flow rate of 5-1000 g/10 minutes which is more than that of resin composition (A) and having a melting point of 80 degrees C or more and at least 10 degrees C lower than that of resin composition (A), and 100-1000 parts mass carbonaceous material (c2), and a tertiary layer comprising porous carbon material having bulk density of 60-800 kg/m3 arranged opposite of primary layer welded to secondary layer. INDEPENDENT CLAIMS are included for the following:    (1) manufacture of carbon material;    (2) redox flow cell; and    (3) fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional schematic view of carbon material.    Primary layer (1)    Secondary layer (2)    Tertiary layer (3)    Carbon material (10)