- 作者: 高憲明,陳建良,趙士維
- 作者服務機構: Department of Chemistry, National Central University, Chung-Li 32054, Taiwan, R.O.C.
- 中文摘要: A novel organic-inorganic hybrid electrolyte based on poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer (Pluronic P123) complexed with LiClO4 via the co-condensation of an epoxy trialkoxysilane and tetraethylorthosilicate was prepared. Characterization was made by a variety of techniques including powder X-ray diffraction, AC impedance, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and multinuclear solid state NMR measurements. The hybrid with [O]/[Li] = 16 exhibited a mesophase with a certain degree of ordering, which arose by the self-assembly of P123 with the silica network. The P123 triblock copolymer acts as a structure-directing surfactant to organize with silica networks and as a polymer matrix to dissolve alkali lithium salts as well. The DSC results indicated the formation of transient crosslinking between Li+ ions and the ether oxygens of the EO and PO segments, resulting in an increase the Tg with increasing salt concentrations. Variable temperature 7Li-{1H} MAS NMR spectra revealed the presence of two different local environments for lithium cations, probably due to the lithium cations in the polymer-rich domain and in the silica-rich domain, respectively. A combination of XRD and conductivity results suggests that the drastically enhanced conductivity for the ordered hybrid electrolyte is closely related to the formation of mesophase, which may provide unique Li+ conducting pathways.
- 英文摘要: --
- 中文關鍵字: Triblock copolymer; Organic-inorganic hybrid; Sol-gel route; Solid state NMR.
- 英文關鍵字: --