Highly conductive trimethylsilyl oligo(ethylene oxide) electrolytes for energy storage applications
作者:Lingzhi Zhang、Zhengcheng Zhang、Scott Harring、Megan Straughan、Rachel Butorac、Zonghai Chen、Leslie Lyons、Khalil Amine、Robert West
DOI:10.1039/b806290k
日期:——
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。
Process for the production of low flammability electrolyte solvents
申请人:UCHICAGO ARGONNE, LLC
公开号:US09263769B2
公开(公告)日:2016-02-16
The invention provides a method for producing electrolyte solvent, the method comprising reacting a glycol with a disilazane in the presence of a catalyst for a time and at a temperature to silylate the glycol, separating the catalyst from the silylated glycol, removing unreacted silazane; and purifying the silylated glycol.
The Pentamethylcyclopentadienylsilicon(II) Cation as a Catalyst for the Specific Degradation of Oligo(ethyleneglycol) Diethers
作者:Kinga Leszczyńska、Andreas Mix、Raphael J. F. Berger、Britta Rummel、Beate Neumann、Hans-Georg Stammler、Peter Jutzi
DOI:10.1002/anie.201101139
日期:2011.7.18
Catalytic open sandwiches: Oligo(ethyleneglycol) diethers RO(CH2CH2O)nR are degraded by the unusual catalyst Cp*Si+ (see scheme). The open coordination sphere at silicon allows up to four SiO contacts; crystal structure data of the reactive compounds [Cp*Si(dme)]+BR4− and [Cp*Si([12]crown‐4)]+BR4− (R=C6F5) show weakly bound ether molecules.