Carbon electrode material for a vanadium-based redox-flow battery
AssigneeToyo Boseki Kabushiki Kaisha
InventorsMasaru Kobayashi, Makoto Inoue, Satoshi Takase
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Abstract
The carbon electrode material of the present invention is used for a vanadium redox-flow cell. The carbon electrode material has quasi-graphite crystal structure in which <002> spacing obtained by X-ray wide angle analysis is 3.43 to 3.60 Å, size of a crystallite in c axial direction is 15 to 33 Å and size of crystallite in a axial direction is 30 to 70 Å. In addition, an amount of surface acidic functional groups obtained by XPS surface analysis is 0.1 to 1.2% and total number of surface bound-nitrogen atoms is 5% or smaller relative to total number of surface carbon atoms. The carbon electrode materials formed of a non-woven fabric of a carbonaceouss fiber is preferable.
Claims14
A carbon electrode material for a vanadium-based redox-flow battery, comprising quasi-graphite crystal structure, wherein <002> spacing is 3.45 to 3.50 Å, size of a crystallite in c axial direction is 20 to 30 Å, and size of a crystallite in a axial direction is 30 to 70 Å, each obtained by X-ray wide angle analysis,
- and having surface property obtained by XPS surface analysis wherein an amount of surface acidic functional groups is 0.1 to 1.2% relative to total number of surface carbon atoms and number of surface bound-nitrogen atoms is 5% or smaller relative to total number of surface carbon atoms, and wherein the carbon electrode material is formed into a non-woven fabric of a carbonaceous fiber, and the non-woven fabric has a bulk density of 0.05 to 0.17 g/cm3.
Dependencies are inferred from the claim text.