Fundamental Study Based On Poly (Ethylene Glycol) Segments Hybrid Solid Electrolytes

In this dissertation,two kinds of Poly(ethylene glycol)/SiO2 solid electrolyte and methoxy Poly(ethylene glycol)/Si02 solid electrolyte were designed and sythesized. The structure of hybrid solid electrolytes were characterized by FT-IR, SEM, TEM. XRD, TG-DSC etc.. The ionic conductivity(σ ) of the solid electrolyte membrane was measured with Model DDS-11A conductor.For Poly(ethylene glycol)/SiO2 solid electrolyte membrane , Polymer solid electrolyte membrane had good heat resistance because inorganic SiO2 particles had a chemical bond with the polymer, σ showed a maximum conductivity with increasing of temperature, σ reached the highest at PEG/HDI of 1:2. The hybrid solid electrolyte showed a maximum value when the segments of Poly(ethylene glycol) were 800.The diameter distribution of core-shell SiO2 particles in the acid environment synthesized by sol-gel reaction were not uniformly. If the amount of TEOS used was abundant, SiO2 particles aggregated. SiO2 particles destroyed the crystallization of polymer,and the membrane was amorphous, σ increased as temperature rised, because the Li+ could move easily, σ rised with the rising of segments of methoxy Poly(ethylene glycol) . σ rised when the amount of TEOS increased, but too much TEOS added result in a lower conductivity. Without TEOS, σ was relatively higher for Li+ might transmit through oxygen in Si-O-Si bond. Conductivity rised with the increasing of [Li+]/[EO] till the proportion of [Li+]/[EO] was 1:5.