BaTiO_3填充PEO基复合聚合物电解质厚膜的制备与性能研究  

Preparation and properties of PEO-based composite polymer electrolyte thickfilms dispersed with BaTiO_3

作　　者：肖云军[1] 朱小红[1] 张凯鑫[1] 徐云辉[1] 张强[1] 朱建国[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610064

出　　处：《真空》2011年第6期10-14,共5页Vacuum

基　　金：教育部博士点新教师基金(No.20100181120021);四川省杰出青年学术技术带头人培育计划(No.2011JQ0021)

摘　　要：采用溶液铸膜法制备PEO基复合聚合物电解质（CPE）厚膜，利用XRD、SEM、DSC、FTIR分析等多种结构测量技术对CPE的性能进行了表征和分析。本文研究的是在（PEO）6：NaPO3基导电聚合物电解质中加入质量分数为3-10wt％BaTiO3填料，从而分析性能的变化。（PEO）6：NaPO3在加入填料后玻璃化转变温度（E）出现上升，熔融温度（L）降低，CPE结晶度降低，表明填料钛酸钡影响了聚合物链的排列，导致其结晶度降低。研究还发现，在（PEO）6：NaPO3的基础上加入了填料钛酸钡，CPE的致密度明显提高，气孔和裂缝都显著减少。导电性研究结果表明含3wt％BaTiO3的CPE拥有最高的离子电导率（σ=2．99×10^-6Scm-1），与纯的（PEO）6：NaPO3相比，加入适量BaTiO3填料的CPE的离子电导率能够增加一个数量级，这可能是因为加入适量低浓度的BaTiO3填料粒子，填料与聚合物发生刘易斯酸碱相互作用引起载流子浓度增加。The PEO-based composite polymer electrolyte（CPE） thick films were prepared by a solution-casting method and multiple structural instruments were used to carry out characterizations, such as XRD, SEM, DSC, FTIR. In this work, we added BaTiO3 in （PEO）6：NaPO3 as filler, where the weight percent of BaTiO3 ranges from 3% to 10%. After dispersing with BaTiO3, the polymer shows an increase in the glass transition temperature （Tg）, a decrease in the melting temperature of crystalline phase （Tm）, and a decrease in the degree of crystallinity. The BaTiO3 filler causes disruption of the ordered arrangement of polymer chains, thereby leads to an increase in the amorphous phase of the polymer. With the addition of BaTiO3, the CPE densification is improved, and porosity and cracks are reduced significantly. Moreover, the results show that the CPE containing 3 wt% BaTiO3 has the highest ionic conductivity（σ = 2.99×10-6 Scm-1）. As compared with pure （PEO）6：NaPO3, the ionic conductivity of CPE with proper level of BaTiO3 filler is increased by an order of magnitude. The enhancement in the ionic conductivity is probably due to the increased carrier concentration, which is induced by the preferable interaction between the BaTiO3 filler and the basic ether oxygen of the polymer.

关 键 词：超级电容器 固体聚合物电解质 离子电导率 聚氧化乙烯 钛酸钡 

分 类 号：O484[理学—固体物理]