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

制备了具有二甲胺基的聚氧四甲基碘烯（DPI），其离子位间的分子量为3200。当（CF_3SO_2）_2NLi掺杂到DPI中时。当[Li]/[- o -]=0.1时，离子电导率最高，在30℃时为8.5×10^<-6> S/cm，在80℃时为9.7×10^<-5> S/cm。该样品的锂离子转移数约为0.5，高于聚氧乙烯/(CF_3SO_2)_2NLi固体电解质。其次，制备了具有锂离子位的二氧化硅颗粒，并将其掺杂到DPI和支链聚氧乙烯中。离子二氧化硅的加入使材料的离子电导率和锂离子转移数略有降低，但力学性能有较大改善。研究了由盐硼酸锂和聚乙二醇组成的固体电解质的离子导电性，发现离子导电性无机材料与聚合物结合可用于制备良好的固态电解质。本课题还分别研究了高分子支链聚氧乙烯和丙烷橡胶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.