| Summary: | 碩士 === 國立中央大學 === 化學研究所 === 95 === A novel organic-inorganic hybrid electrolyte based on the formation of ureasils through the reaction in different ratios of poly (propylene glycol)-block-poly (ethylene glycol)-block-poly (propylene glycol) bis (2-aminopropyl ether) (ED2000) with 3-isocyanatopropyltriethoxysilane (ICPTES), followed by the via the co-condensation of 3-Glycidoxypropyl -trimethoxysilane (GLYMO) in the presence of LiClO4, has been prepared.
The structure and functionality of the materials thus obtained were characterized a variety of techniques including alternating current impedance, FT-IR spectroscopy, differential scanning calorimetry, and multinuclear solid-state NMR spectroscopy. The results of DSC measurements indicate the formation of transient cross-links between Li+ ions and the ether oxygens on complexation with LiClO4, resulting in an increase in the soft segment Tg. Behavior of ionic conductivity is Vogel-Tammann-Fulcher (VTF)-type. Solid-state NMR was used to probe the structure and dynamics of organic and inorganic components in the hybrid electrolyte and 13C cross-polarization/magic angle spinning NMR results from variable contact time measurements indicated that a significant decrease in the mobility of the polymer chains as the salt content was increased. 7Li NMR characterization was performed to study ionic mobility by measuring spectral line widths, T1 relaxation times, and diffusion coefficients. The results of the lithium diffusion coefficient measurements indicated that the ionic conductivity in the present electrolytes was mainly dominated by the mobility of the lithium cations.
|
|---|
