复合导电剂在超细炭微球超级电容器中的应用研究

Whether the conductive agent could form a good conductive network in the electrode materials is one of the key factors that affect the performance of supercapacitor. Ultrafine hollow carbon spheres with high specific surface area and hierarchical pore structure, synthesized based on the modified Stöber method, were taken as the electrode materials of supercapacitors. And the effects of single-walled carbon nanotubes/carbon black composite conductive agents on the performance of supercapacitor were studied with single carbon black or single-walled carbon nanotubes as the contrast. The results show that at current density of 0.2 A/g, the specific capacitance of sample with the composite conductive agents is 205.7 F/g, being much higher than that of carbon black or carbon nanotubes alone. At a high current density of 100 A/g, the specific capacitance can remain a high value of 104.0 F/g for the composite conductive agent sample, heightening 275% than that of carbon black. The examining results indicate that the long fibrous carbon nanotubes and carbon black particles can form a dot-line synergistic conductive network in the ultrafine hollow carbon spheres, which is the main reason of improving the performance of supercapacitors.