Functionalized Ionic Liquids Based on Trialkylimidazolium Cations with Alkoxymethyl Group at the N-1 Position: Synthesis, Characterization, and Application as Electrolytes for a Lithium Ion Battery

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• 作者：Yide Jin ; Shaohua Fang ; Jianhao Zhang ; Zhengxi Zhang ; Kaiqiang Yu ; Jianzhi Song ; Li Yang ; Shin-ichi Hirano
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：February 26, 2014
• 年：2014
• 卷：53
• 期：8
• 页码：2860-2871
• 全文大小：682K
• 年卷期：v.53,no.8(February 26, 2014)
• ISSN：1520-5045

文摘

Twenty-four new functionalized ionic liquids (ILs) based on trialkylimidazolium cations with the alkoxymethyl group at the N-1 position were synthesized and characterized. Physicochemical properties of these ILs, such as melting point, thermal stability, density, viscosity, conductivity, and electrochemical stability, were studied systematically. Twenty-one ILs appeared in the liquid state at room temperature, and 14 ILs showed a melting point lower than 鈭?0 掳C. Introduction of the alkoxymethyl group at the N-1 position of trialkylimidazolium cations could not be more beneficial than that of the alkoxyethyl group for reducing viscosity. Li/LiFePO₄ cells employing three trialkylimidazolium ILs with methoxymethyl-group-based electrolytes showed good discharge capacity and cycle stability at a current rate of 0.1 C. This is the first report of ILs with the alkoxymethyl group used as electrolytes without an additive for a lithium ion battery.