| abstract |
The present invention provides a carbon electrode material for a redox flow battery. Even when a manganese-titanium electrolyte is used, it can stabilize Mn ions and reduce cell resistance during initial charge and discharge, and has extremely high oxidation resistance. Excellent. The electrode material of the present invention is composed of carbon fibers (A), graphite particles (B), and a carbonaceous material (C) that binds these, and satisfies the following requirements: (1) Regarding carbonaceous material (C) , When the size of the crystallites in the c-axis direction obtained by X-ray diffraction is set to Lc(C), Lc(C) is 10nm or more; (2) Regarding carbon fiber (A), When the size of the crystallites in the c-axis direction obtained by X-ray diffraction is set to Lc(A), Lc(C)/Lc(A) is 1.0 or more; (3) Regarding the structure of carbon fiber (A) , The average curvature is above 1R and the average fiber diameter is 5μm to 15μm; (4) The number of bonded oxygen atoms on the surface of the carbon electrode material is more than 1.0% of the total number of carbon atoms on the surface of the carbon electrode material. |