| Gel polymer electrolytes overcome the disadvantages of corrosion and leakage of liquid electrolyte, meantime, they contain the virtue of the structural properties of polymer, easier packing properties and high electrochemical and chemical stability applying for the ion-transporting devices. It is also very convenient to design the shape at will. It is a revolution that polymer electrolytes replace conditional liquid electrolytes!The main contents of this thesis as follow:Oxymethylene-linked polyoxyethylene block polymers were synthesized by condensing of dichloromethane with a mixture of different molecular weight of PEG 400 and 600 in the presence of potassium hydroxide powder. The structure of block polymer was confirmed by IR, Raman and XRD spectroscopy. The effects of the amounts of LiClO4, SiO2, the ratio of EC/PC and the amounts of block-polymer were investigated by orthogonal test in the first time. The ionic conductivity of the solid polymer electrolyte at room temperature is 1.79×10-3Scm-1, which can be well-controlled under following optimized compositions: 0.7g of LiClO4, 0.7g of SiO2, 7g 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 electrochromic devices, smart window and new type of flat displays.Blending of polymers may increase the ionic conductivity of electrolyte by decreasing... |
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