凝胶聚合物电解质MnO_2/AC电容器的研究

Research on MnO_2/AC capacitor with gel polymer electrolytes

采用液相氧化法制备了MnO2超级电容器电极材料,以MnO2为正极材料,活性炭(AC)为负极材料,丙烯腈作聚合物单体,碳酸二甲酯(DMC)与碳酸乙烯酯(EC)的混和液作增塑剂,高氯酸锂为支持电解质,采用内聚合法制备PAN基凝胶聚合物电解质MnO2/AC混合电容器.通过循环伏安、交流阻抗、恒流充放电等测试方法对混合电容器的电化学性能进行了测试.结果表明:混合电容器的工作电压为2.5 V,比容量为27.3 F/g(i=0.5 mA/cm2),比同电解质体系的AC/AC电容器提高约48.21%.

MnO2 was synthesized by liquid oxo-process method, and Polyacrylonitrile （PAN） based gel polymer electrolytes MnO2/AC hybrid capacitors were fabricated by an insitu polymerizational method with MnO2 as positive electrode and activated carbon as negative electrode. A mixture of dimethyl carbonate （DMC） and ethylene carbonate（EC） was used as a plasticizer. Lithium perchlorate were used as supporting electrolytes. Hybrid capacitor properties were determined by experiments of cyclic voltammetry, impedance spectrum, constant current charge/ discharge, showing that the working voltage of hybrid capacitor reaches to 2.5 V. The specific capacitance of the supercapacitor is 27.3 F/g（ i = 0. 5 mA/cm^2 ） and is 48.21% higher than that of AC/AC capacitor with the same electrolyte.