Carbon electrode material for redox flow battery and method for producing the same

摘要

In particular, even when using a Mn-Ti-based electrolytic solution, a carbon electrode material for a redox flow battery which is excellent in oxidation resistance while stabilizing Mn ions and suppressing an increase in cell resistance during initial charge and discharge. I will provide a. The electrode material of the present invention comprises a carbonaceous fiber (A) and a carbonaceous material (B) binding the carbonaceous fiber (A), and satisfies the following requirements. (1) When the crystallite size in the c-axis direction in the carbonaceous material (B) determined by X-ray diffraction is Lc(B), Lc(B) is 10 nm or more, and (2) the carbonaceous fiber ( When the crystallite size in the c-axis direction determined by X-ray diffraction in A) is Lc(A), Lc(B)/Lc(A) is 1.0 or more, and (3) carbon electrode material surface The number of bonded oxygen atoms is 1.0% or more of the total number of carbon atoms on the surface of the carbon electrode material.