双组份导电剂对MnO_2-AC混合型超级电容器单体性能的影响

Effect of Double-component Conductive Agents on the Properties of MnO_2-AC Hybrid Supercapacitor

采用阳极电沉积法制备出块状MnO2,对其热处理之后进行机械球磨处理制得MnO2粉末。通过改变乙炔黑(型号分别为HS100和G350)和碳纳米管的含量配比,制得一系列双组份导电剂复合MnO2正极,将其与活性碳负极组成MnO2-AC(活性碳)单体,并在0.5 mol/L的Na2 SO4中性溶液中进行了电化学性能测试和稳定性测试。结果表明,配比为5%HS100(或G350)+5%MWCNTs(碳纳米管)的二氧化锰超级电容器单体放电比容量最大,分别为20.38 F/g(HS100)和20.19 F/g(G350),并具有最小的串联等效电阻,分别为4 780 mΩ(HS100)和3 840 mΩ(G350)。在完成10 000个循环以后,其单体的等效串联电阻仍旧最小,分别为5 000 mΩ(HS100)和6 000 mΩ(G350)。另外,5HS100型乙炔黑综合性能优于G350型。

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 （HSI00） 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.