| abstract |
Disclosed is a carbon electrode material for a redox flow battery, which can reduce cell resistance at the time of initial charge and discharge, and is excellent in battery energy efficiency. The electrode material of the present invention comprises a carbonaceous fiber (A) and a carbonaceous material (B) for binding the carbonaceous fiber (A), and satisfies the following requirements. (1) When the size of the crystallite in the c-axis direction determined by X-ray diffraction in the carbonaceous material (B) is Lc (B), Lc (B) is less than 10 nm, (2) carbonaceous fiber (B) Lc (B) / Lc (A) is 1.0 or more when the size of the crystallite in the c-axis direction determined by X-ray diffraction in A) is Lc (A), (3) Carbon electrode material surface The number of bonded oxygen atoms is 1% or more of the total number of carbon atoms on the surface of the carbon electrode material |