Structural characterization and dynamic properties of organic-inorganic hybrid electrolytes based on alkoxysilane modification

• Main Authors: Yu-hsiu Chen, 陳育修
• Other Authors: 高憲明
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/34601708235558264454

碩士 === 國立中央大學 === 化學研究所 === 95 === This research focus on the preparation and characterization of organic–inorganic hybrid electrolytes based on poly(propylene glycol)-block-poly(ethylene glycol)-block-poly(propylene glycol) bis(2-aminopropyl ether) (ED600、ED900、ED2000) complexed with LiClO4 via the co-condensation of tetraethoxysilane (TEOS) and 3-(triethoxysilyl)propyl isocyanate. The dry organic–inorganic hybrid electrolytes thus obtained were also plasticized by a solution of ethylene carbonate (EC)/propylene carbonate (PC) mixture (1:1 by volume). The ionic conductivity of the dry hybrid electrolyte films was enhanced by two orders of magnitude via plasticization, reaching a maximum conductivity value of 2.11×10-3 S/cm of the polymer molecule weight 2000 at 30℃. A variety of techniques such as DSC、TGA、FT-IR、SEM、XRD、AC Impedance and solid state NMR spectroscopy are performed to elucidate the realtionship between the structural and dynamic properties of the hybrid electrolyte and the ion mobility. According to DSC results, the glass transition temperature (Tg) raised with increasing the lithium salt content. By means of 2D 1H-13C WISE (WIdeline SEparation) NMR, the dynamic information within such a hybrid system can be qualitatively assessed by examining the proton line shapes in the F1 dimension that are directly related to structural elements resolved in the 13C CP/MAS NMR spectrum in the F2 dimension. Furthermore, the 7Li diffusion coefficients of the dry hybrid electrolytes were determined by pulsed gradient spin-echo (PGSE) experiment to correlate with the behavior of the ion conductivity.