聚环氧乙烷复合聚合物电解质/惰性电极交流阻抗谱的研究

制备了PEO LiClO4 Al2 O3及PEO LiClO4 碳酸乙烯酯 (EC)两种聚环氧乙烷(PEO)复合聚合物电解质 (SPE)薄膜 ,用不锈钢及铂两种惰性电极研究了聚合物电解质的交流阻抗特性 ,并对SPE/惰性电极的界面特性进行了研究 .提出了一种具有普适性的等效电路 ,发现电导率的测定与采用的惰性电极有关 .而且交流阻抗谱图与所加交流扰动幅度无关 ,但与直流极化电势有关 .EC含量的增加对低频直线的斜率也有影响 .

Ac Impedance Characteristics of Composite Polymer Electrolyte Based on Poly(ethylene oxide)(PEO)/Blocking Electrode Interface

Two kinds of sokid composite polymer electrolytes (SPE) of (PEO 1) 10 LiClO 4 Al 2O 3 and (PEO 2) 16 LiClO 4 EC were prepared and Pt and cstainless steel (SS) blocking electrodes were used to study the impedance characteristics and the SPE/?blocking electrode interface. It is found that the different blocking electrode materials,the polarization potentials applied in the experiments,and the EC concentration,can influence the impedance plots of SPE/?bolcking electrode system. While the ac perturbation potentials have no effect on the impedance characteristics. Moreover,using the equivalent crircuit proposed the theoretical line has good correlation with the experiment data,which indicates that the equivalent ciruit can be commonly used for other SPE/?blocking systems.;