The small capacity of the battery has been successfully applied in human life, further research and development of new environmentally friendly battery suitable for large-scale energy storage, development and utilization of new energy sources, will have great social and economic significance. All vanadium redox flow battery can be regarded as the representative of the new energy storage battery, compared with other batteries and it has a unique advantage, and therefore by researchers at home and abroad. At present, the vanadium battery has been abroad applied to wind power plant, power station power peaking and solar photovoltaic demonstration operation. But the development of vanadium battery is still limited, the electrode material is a very important factor.
The electrode material is mainly divided into metal electrode and carbon electrode, wherein the carbon electrode with good stability reflects the greater advantage, and the carbon electrode, graphite felt materials with its advantages of real surface area is much larger than the geometric surface area and occupies the dominant position.
Using concentrated sulfuric acid liquid phase oxidation and air oxidation method to activate the graphite felt, it was found that the electrochemical performance of the graphite felt can be greatly improved.
The surface treatment of graphite felt electrode for vanadium battery was carried out by electrochemical oxidation method, and the charge discharge performance of the assembled battery was excellent.
The main change of electrochemical treatment is the ratio of O/C and the number of oxygen containing functional groups on the carbon fiber surface of graphite felt,especially the amount of COOH.
Treated graphite felt as electrode, the battery showed good charge and discharge performance.