Effect of Double-component Conductive Agents on the Properties of MnO₂-AC Hybrid Supercapacitor

The MnO₂ power was prepared by using heat treatment and mechanical ball-milling from the massive MnO₂ which was synthetized by anodic electrodeposition. The positive electrode of the supercapacitor monomer was obtained by optimizing the content of acetylene black(The types were HS100 and G350)and carbon nanotube. Super capacitor monomer was composed of positive electrode which was prepared by using MnO₂ power and negative electrode which was made up by active carbon. Electrochemical and stability test were investigated in 0.5M Na₂SO₄ solution. Electrochemical test shows that, the hybrid supercapacitor monomers with the maximum specific capacity and minimum internal resistance was made up by 5%HS100(G350) +5%MWCNTs. The highest specific capacity was 20.38F/g(HS100) and 20.19 F/g(G350), respectively. The minimum internal resistance were 4 780 mΩ(HS100) and 3 840 mΩ(G350). Stability test shows that the internal resistances of the monomer which were 5 000 mΩ(HS100) and 6 000 mΩ(G350) still were the smallest after 10 000 cycles. Besides, the combination property of HS100 acetylene black was better than the G350 acetylene black.