| Summary: | 碩士 === 國立中央大學 === 化學研究所 === 91 ===
The objective of this study is to investigate the effect of the mesoporous molecular sieve SBA-15 on the ionic conductivity behavior, and investigate into a inorganic-organic hybrid electrolyte derived from the self-assembly of poly(ethylene oxide)—poly(propylene oxide)—poly(ethylene oxide) triblock copolymer by co-condensation of an epoxy silane and tetraethoxysilane (TEOS) in the presence of LiClO4.
In the first part of this thesis, solid polymer electrolytes based on poly (ethylene oxide) (PEO) have been characterized by solid-state NMR, scanning electron microscopy (SEM), X-ray diffraction Spectrometer (XRD), differential scanning calorimemeter (DSC), and AC impedance measures. The present of small quantity of uncalcined SBA-15 do not enhance the resulting composite electrolyte as compared to present PEO/LiClO4 electrolyte, mainly because uncalcined SBA-15 filler acts an insulator that impedes the lithium ion transport. However, the present of small quantity of calcined SBA-15 enhances the resulting composite electrolyte as compared to present PEO/LiClO4 electrolyte. The hybrid with 10 wt% LiClO4 and 10 wt% calcined SBA-15 reaches conductivity up to 3.85 × 10-5 S/cm at 30 oC.
In the second part of this thesis, a new inorganic-organic hybrid electrolyte has been prepared and characterized. The block copolymer acts as a structure-directing surfactant to organize polymerizing XRD results show the formation of stabilized mesophases with long-range ordering has been built by the self-assembly of triblock copolymer and alkali metal salts, particularly for [O]/[Li] = 16. A combination of XRD and conductivity results allows us to presume that the drastically enhanced conductivity for the hybrid with high long-range ordering is closely related to the formation of mesophase, which might improve the arrangement of Li+ conducting pathways. The hybrid with [O] / [Li] = 16 reaches conductivity up to 10-5 S/cm at 30 oC
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