Journal
IONICS
Volume 21, Issue 9, Pages 2523-2534Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-015-1425-z
Keywords
Organic-inorganic hybrid electrolyte; Ionic conductivity; Thermal analysis; Electrochemical stability
Funding
- Ministry of Science and Technology, Taiwan
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Organic-inorganic hybrid electrolytes based on the reaction of triblock copolymer poly(propylene glycol)-block-poly(ethylene glycol)-block-poly(propylene glycol) bis(2-aminopropyl ether) and 3-(triethoxysilyl)propyl isocyanate doped with lithium trifluoromethanesulfonate and Al2O3 nanowires were synthesized by a sol-gel process. The structural and electrochemical properties of the materials thus obtained were systematically investigated by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry, thermogravimetric analysis, powder X-ray diffraction, Si-29 CPMAS (cross-polarization magic angle spinning) NMR, alternate current impedance, and linear sweep voltammetry measurements. FTIR spectra showed the occurrence of complexation and interaction among the components. The maximum ionic conductivity values of 9.8 x 10(-5) S cm(-1) and 6.8 x 10(-4) S cm(-1) were obtained at 30 and 75 A degrees C, respectively, for the solid hybrid electrolyte with a [O]/[Li] ratio of 16 and 1 wt% of Al2O3 nanowires. A Vogel-Tamman-Fulcher-like temperature dependence of ionic conductivity was observed for the hybrid electrolytes doped with fillers. The electrochemical stability window of similar to 4.0 V makes the organic-inorganic hybrid electrolyte promising for lithium-ion battery application at low voltages.
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