Computational Studies of Polysiloxanes: Oxidation Potentials and Decomposition Reactions

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• 作者：Rajeev S. Assary ; Larry A. Curtiss ; Paul C. Redfern ; Zhengcheng Zhang ; Khalil Amine
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：June 23, 2011
• 年：2011
• 卷：115
• 期：24
• 页码：12216-12223
• 全文大小：839K
• 年卷期：v.115,no.24(June 23, 2011)
• ISSN：1932-7455

文摘

Silicon-containing solvents have tremendous potential for application as electrolytes for electrical energy storage devices such as lithium-ion (air) batteries and supercapacitors. Quantum chemical methods were employed to investigate trends in oxidation potentials and decomposition reactions of a series of polysiloxanes. Various electron-donating and -withdrawing substituents can be used to tune the oxidation potential in shorter chain siloxanes but not in longer ones. Decomposition reactions of siloxanes in their oxidized states were investigated and compared against their carbon analogues. These studies suggest that the Si鈭扥 group provides added stability for siloxanes over their carbon analogues. Computational studies have also been performed for various disiloxanes and siloxanes with spacer groups to understand their thermochemical stability and oxidation potentials.