有效介质理论离子导电模型的修正

Modification of ionic conductivity model based on effective medium theory

针对现有有效介质理论(EMT)导电模型存在的问题和不足,通过对复合固态聚合物电解质(CSPE)导电性增强机制的分析,引入新的无机填料界面层离子导电模型及模型参数,对EMT离子导电模型进行修正。采用原位复合法制备聚环氧乙烷(PEO)基聚合物电解质,通过实验测定样品离子电导率与无机填料SiO2含量之间的关系,应用现有的EMT离子导电模型和修正后的EMT离子导电模型分别对样品的离子电导率与无机填料含量关系进行计算,将计算数值与实验数值进行比较。结果表明,修正后的EMT离子导电模型的计算值与实验值吻合较好。

In view of the existing deficiency and shortcoming of the ionic conductivity model based on effective medium theory （EMT）, a modified ionic conduction model of the layer between the inorganic fillers and the polymer matrix was introduced by analyzing the enhancement mechanism of conductivity of composite solid polymer electrolyte（CSPE） and the new model parameters were introduced too, The samples based on polyethylene oxide （PEO） were prepared by in situ blending with different volume fraction of inorganic particles, The relations between ionic conductivity and content of inorganic particles （SiO2） were determined through experiments. The EMT ionic conduction model and modified EMT ionic conduction model were applied to calculate ionic conductivities of the samples with different contents of inorganic particles, and the calculated values were compared with the experiment values, The results show that the calculated values of the modified EMT model are consistent with the experiment values.