乙醇功能化烯离子液体对物质和离子溶解在溶盐离子液体中的影响
Michael J Keating1,2, Elijah Bernard1,3, Martina Hove1,3
1Department of Chemical Engineering, The City College of New York, CUNY, New York, New York 10031, United States.
概括
新的以太功能化的离子液体增强了电池电解质. 1混合物显示电导率增加了67%,而3混合物由于阴离子溶解竞争而降低了电导率.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 离子液体为电池电解质提供可调节的特性,包括不易燃性和广泛的电化学稳定性.
- 溶解物离子液体,如LiG4TFSI (二三甲基硫) 胺和四),由于阴离子-溶剂相互作用,表现出类似离子液体的行为.
研究的目的:
- 合成和表征具有以太功能化侧链 (EO1和EO3) 的新型铁离子液体.
- 研究它们作为电解质组件的潜力,当与电池的LiG4TFSI混合时.
- 阐明以太链长度对电解质特性和离子溶解的影响.
主要方法:
- 合成具有一个 (EO1) 或三个 (EO3) 以太部分的烯离子液体.
- 使用 LiG4TFSI 制备电解质混合物.
- 使用电化学,热学和风湿学测量进行表征.
- 光谱分析包括脉冲场梯度核磁共振 (PFG-NMR) 和13C核磁共振.
主要成果:
- 在30°C时,EO1:LiTFSI:G4 (1:1:1摩尔比) 混合物显示电导率 (2.54 mS/cm) 与LiG4TFSI (1.53 mS/cm) 相比增加了67%.
- EO3:LiTFSI:G4混合物显示电导率显著降低 (0.279 mS/cm).
- PFG-NMR表明EO1离子与EO3离子的扩散速度更快.
- 核磁共振研究显示,Li+优先溶解四聚甘,对EO1的协调是最小的,对EO3以太侧链的协调是有限的.
结论:
- 以太功能化的离子液体可以定制为修改电池的电解质特性.
- EO1部分增强了导电性,这可能是由于有利的溶解和离子流动性.
- EO3部分较长的以太链导致有害的溶解竞争,损害了质量传输和导电性.
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