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Issue 31, 2008
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Highly conductive trimethylsilyl oligo(ethylene oxide) electrolytes for energy storage applications

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Abstract

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.

Graphical abstract: Highly conductive trimethylsilyl oligo(ethylene oxide) electrolytes for energy storage applications

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Publication details

The article was received on 14 Apr 2008, accepted on 10 Jun 2008 and first published on 09 Jul 2008


Article type: Paper
DOI: 10.1039/B806290K
Citation: J. Mater. Chem., 2008,18, 3713-3717
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    Highly conductive trimethylsilyl oligo(ethylene oxide) electrolytes for energy storage applications

    L. Zhang, Z. Zhang, S. Harring, M. Straughan, R. Butorac, Z. Chen, L. Lyons, K. Amine and R. West, J. Mater. Chem., 2008, 18, 3713
    DOI: 10.1039/B806290K

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