Preparation of rubbery nano-composites with high ionic conductivity and lithium ion transference number

合成了含二甲基铵基团的聚氧四亚甲基紫罗兰烯(DPI)，其离子中心之间的相对分子质量为3200。当(CF3SO2)2NLi掺杂到DPI中时。当[Li]/[-O-]=0.1时，离子电导率最高，30℃时为8.5×10~(-6)~(-6)S/cm，80℃时为9.7×10~(-5)~(-5)S/cm。测得该样品的锂离子迁移数约为0.5，高于聚氧乙烯/(CF3SO2)2NLi固体电解质。其次，制备了具有锂离子中心的二氧化硅粒子，并将其掺杂到DPI和支化聚氧乙烯中。离子二氧化硅的加入降低了材料的离子电导率和锂离子迁移数，但提高了材料的力学性能。研究了卤水铝锂与聚乙二醇组成的固体电解质的离子导电性，发现离子导电无机材料可与聚合物结合制备良好的固体电解质。本项目还分别研究了支化聚氧乙烯和海德林橡胶中氧乙烯链段的分子取向和聚氧乙烯含量对离子电导率的影响。

Poly(oxytetramethylene) ionene with dimethylammonium groups (DPI) was prepared, whose molecular weight between the ionic sites was 3200. When (CF_3SO_2)_2NLi was doped into DPI. at the concentration of [Li]/[-O-]=0.1, the highest ionic conductivity was observed, and it was 8.5×10^<-6> S/cm at 30℃ and 9.7×10^<-5> S/cm at 80℃. The transference number of lithium cation of this sample was measured to be ca. 0.5, which was higher than that of poly(oxyethylene)/(CF_3SO_2)_2NLi solid electrolytes. Next, silica particles with lithium ionic sites were prepared and were doped into DPI and branched poly(oxyethylene). The ionic conductivity and lithium transference number were observed to become a little lower by addition of ionic silica, however the mechanical properties was much improved. The ionic conductivity of solid electrolytes composed of lithium haloboracite and polyethylene glycol was studied, and the ionic conductive inorganic material was found to be useful for preparation of good solid state electrolyte by combination with polymers. The effect of molecular orientation of oxyethylene segments and the effect of poly(oxyethylene) content on the ionic conductivity were also investigated for high molecular branched poly (oxyethylene) and hydrin rubber, respectively, in this project.