Density, Viscosity, and Conductivity of [VAIM][TFSI] in Mixtures for Lithium-Ion Battery Electrolytes,Journal of Chemical & Engineering Data

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Density, Viscosity, and Conductivity of [VAIM][TFSI] in Mixtures for Lithium-Ion Battery Electrolytes
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-01-10 , DOI: 10.1021/acs.jced.9b00648
Yingjun Cai _{1,

2} , Nicolas von Solms ₁ , Suojiang Zhang ₂ , Kaj Thomsen ₁

Affiliation

A novel unsaturated and amide-based ionic liquid, [VAIM][TFSI] (3-(2-amino-2-oxoethyl)-1-vinylimidazolium bis(trifluoromethylsulfonyl)amide), was synthesized using a two-step method. Its structure was confirmed by nuclear magnetic resonance, and its water content was determined by Karl Fischer titration to be below 0.03 wt %. The density, viscosity, and conductivity of the pure ionic liquid and its binary mixtures with acetonitrile were measured at various temperatures and at ambient pressure. Both the density and viscosity increase with the mole fraction of the ionic liquid and decrease with decreasing temperature. Excess molar volumes and viscosity deviations were calculated from the experimental results. The electrical conductivities in mixtures with different contents of the ionic liquid were investigated at different temperatures. The highest conductivity of binary mixtures is achieved at 0.07 mole fraction, with a value of ∼3.32 S·m^–1 at 298.15 K. The conductivity of an electrolyte consisting of acetonitrile, LiTFSI, and the ionic liquid was measured to determine the optimal ionic liquid content. The suggested concentration is 3 wt% ionic liquid in this electrolyte, giving a conductivity of ∼4.11 S·m^–1 at 298.15 K.

中文翻译：

锂离子电池电解质混合物中[VAIM] [TFSI]的密度，粘度和电导率

使用两步法合成了一种新型的基于不饱和酰胺的离子液体[VAIM] [TFSI]（3-（2-氨基-2-氧乙基）-1-乙烯基咪唑双（三氟甲基磺酰基）酰胺]。通过核磁共振证实其结构，并且通过卡尔·费休滴定法测定其水含量低于0.03重量％。在各种温度和环境压力下测量纯离子液体及其与乙腈的二元混合物的密度，粘度和电导率。密度和粘度都随离子液体的摩尔分数而增加，而随温度降低而降低。从实验结果计算出过量的摩尔体积和粘度偏差。在不同温度下研究了离子液体含量不同的混合物中的电导率。在298.15 K时为^–1。测量由乙腈，LiTFSI和离子液体组成的电解质的电导率，以确定最佳离子液体含量。建议的浓度为该电解液中3％的离子液体，在298.15 K时电导率为〜4.11 S·m ^–1。

更新日期：2020-01-10

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