CARBON FELT, METHOD FOR TREATING OF SURFACE OF CARBON FELT, VANADIUM-REDOX FLOW SECONDARY CELL HAVING THE SAME AND STACKED SECONDARY CELL

摘要

The present invention relates to a carbon felt, a surface treatment method of a carbon felt, a vanadium-redox flow secondary battery and a stacked secondary battery wherein a carbon felt surface is conducted with a corona discharge treatment and immersed in a liquid oxidizer and conducted with an ultrasonic treatment and then changes of functional group are induced and thereby, without using a heat treatment or using a catalyst containing a precious metal, it is possible to reduce a time required for the carbon felt surface treatment and possible to improve an affinity between an electrolyte and a carbon felt and in addition, it is possible to facilitate an oxidation and reduction of vanadium, thereby enhancing energy efficiency.