不同分子量PEO合成的聚乙二醇嵌段聚合物固体电解质研究

Study of solid electrolyte based on block-polymer synthesized with different molecular weight of polyoxyethylene

用不同平均分子量的聚乙二醇混合物和二氯甲烷在氢氧化钾存在下合成氧亚甲基连接的聚氧乙烯多嵌段聚合物作为电解质基质。通过正交实验,对影响凝胶型固体电解质室温电导率的因素,LiClO4、纳米SiO2、增塑剂碳酸乙烯酯、碳酸丙稀酯以及嵌段聚合物的用量等进行了优化研究和验证。实验结果表明,LiClO40.7g,SiO20.7g,嵌段聚合物为7g,EC/PC的质量比为5∶0时,得到室温离子电导率为1.79×10-3S/cm的聚合物固体电解质。拉曼光谱分析表明体系中只有自由离子,没有发现离子对及离子聚集体。可见光透射光谱表明该体系可以用于制备电致变色器件、灵巧调光窗及新型平板显示器。

Oxymethylene-linked polyoxyethylene block polymers were synthesized by condensing of diehloromethane with a mixture of different molecular weight of PEG 400 and 600 in the presence of potassium hydroxide powder. The effects of the amounts of LiClO4 ,SiO2 ,the ratio of EC/PC and the amounts of block-polymer were investigated by orthogonal test. The ionic conductivity of the solid polymer electrolyte at room temperature is 1.79×10^-3 S/cm, which can be well-controlled under following optimized compositions.0.7g of LiClO4, 0.7g of SiO2 ,Tg of block-polymer,5/0 ratio of EC/PC. Raman spectroscopy identified that there are only free ions present. Spectral transmittance of the solid polymer electrolyte film shows very high transparency in the visible light region. So, it is a promising electrolyte for an all-solid-state complementary eleetroehromie devices, smart window and new type of flat displays.