PMMA基凝胶聚合物电解质双电层电容器的研究

Investigations on EDLCs using PMMA-based Gel Polymer Electrolytes

以碳酸丙烯酯(PC)和碳酸乙烯酯(EC)作增塑剂,LiClO4作支持电解质,高比表面积活性炭为电极,内聚合法制作PMMA-PC+EC-LiClO4体系凝胶聚合物电解质(GPE)双电层电容器.应用交流阻抗、循环伏安、恒流充放电等方法研究了该电容器的性能.结果表明,PMMA-GPE的离子电导率在室温下达3.7 mS.cm-1,电容器的工作电压达3 V,比容量达41.6 F.g-1(I=1 mA.cm-2),等效串联电阻仅为几欧姆.

Polymethyl methacrylate （PMMA） based gel polymer electrolytes electrochemical＇double layer capacitors（GPE-EDLCs） were fabricated by an in situ polymerisatonal method with actived carbon electrodes, using propylene carbonate （PC） and ethylene carbonate （EC） as plasticizer, lithion perchlorate as surporting electro- lytes. The ion conductivity values of GPEs were evaluated by AC impedance. The properties of PMMA-based GPEs capacitors were researched by impedance spectrum, cyclic voltammetry, galvanostatic charge-discharge. It showed that the ion conductivities of the PMMA-based gel polymer electrolytes reached to 3.7 mS ·cm ^-1 at ambient tempreture. The working voltage of the capacitors reached to 3.0 V. The specific capacitance of the capacitor was obtained as high as 41.6 F · g^-1 （1 = 1 mA· cm^-2）. The equivalent serial resistance of the capacitors were just several Ohm.