Monomethyl ethers of oligoethylene glycols with different chain lengths were converted to trimethylsilyl derivatives by reacting with trimethylchlorosilane in the presence of triethylamine, or by directly refluxing with excess trimethylchlorosilane or hexamethyldisilazane. Similarly, two oligoethylene glycols were converted to bis(trimethylsilyl) derivatives. When doped with lithium bis(trifluoromethanesulfonyl)imide, these electrolytes have very high conductivity, generally >10−3 S cm−1. A full cell performance test using one of these new electrolytes (1NM3) showed excellent cyclability at room temperature. Introducing a second trimethylsilyl group decreases the conductivity of trimethylsilylated compounds. The thermal properties, viscosities and dielectric constants of the compounds were measured, and the effect of those on the conductivity is reported. Cyclic voltammetry experiments show that the trimethylsilylated compound (1NM2) of diethylene glycol monomethyl ether has greater electrochemical stability than its germanium and carbon analogues.
不同链长的低
聚乙二醇单甲醚在
三乙胺存在下与三
甲基氯硅烷反应,或直接与过量三
甲基氯硅烷或
六甲基二硅氮烷回流,转化为三甲基
硅烷衍
生物。同样,两种低聚
乙二醇转化为双(三甲基
硅烷)衍
生物。掺杂双(三
氟甲磺酰)
亚胺锂后,这些电解质的电导率非常高,通常>10−3 S cm−1。使用其中一种新电解质(1NM3)进行的完整电池性能测试表明,其在室温下具有出色的循环性能。引入第二个三甲基
硅烷基团会降低三甲基
硅烷化化合物的电导率。测量了化合物的热性质、黏度和介电常数,并报告了它们对电导率的影响。循环伏安法实验表明,
二乙二醇单甲醚的三甲基
硅烷化化合物(1NM2)的电
化学稳定性比其
锗和碳类似物更高。