In order to increase the solubility and oxidation potential of redox shuttles, electroactive ionic liquids (RILs) based on the modification of 1,4-dimethoxybenzene with triflimide anions were synthesized. We developed two synthetic routes to obtain these RILs in which the triflimide was either linked on the benzene ring or as a ether on 2,5-ditert-butyl-1,4-dimethoxybenzene (DDB). These RILs all have melting points below 100 °C, but above room temperature. The structural impact of electroactive anion was evaluated in this study by determining the redox potential and electrochemical stability. The electrochemical properties of these RILs were investigated by cyclic voltammetry and the diffusion coefficients were measured by double potential step chronoamperometry. The viscosity and ionic conductivity measurements of redox-active electrolyte were obtained at different temperatures and the RIL additives are shown to have a low impact on these electrolyte properties at concentrations up to 0.3 M. The charge-overcharge-discharge cycles of Li/LiFePO₄ half-cells and Li₄Ti₅O₁₂/LiFePO₄ full cells with a 100% overcharge are presented using redox-active electrolyte (0.3 M concentration level) at 0.1 C rate. This study highlights the potential of electroactive ionic liquids as highly soluble and stable functional additives in Li-ion battery electrolytes.

为了增加氧化还原梭的溶解度和氧化电位，合成了基于三氟甲酰亚胺阴离子修饰1,4-二甲氧基苯的电活性离子液体（RIL）。我们开发了两种合成途径来获得这些RIL，其中三氟甲酰亚胺要么连接在苯环上，要么作为1,5-二叔丁基-1,4-二甲氧基苯（DDB）上的醚。这些RIL的熔点均低于100°C，但高于室温。本研究通过确定氧化还原电势和电化学稳定性来评估电活性阴离子的结构影响。通过循环伏安法研究了这些RIL的电化学性质，并通过双电势步计时电流法测量了扩散系数。使用氧化还原活性电解液（0.3 M浓度水平）以0.1 C的速率呈现_4个半电池和100％过充电的Li ₄ Ti ₅ O ₁₂ / LiFePO ₄充满电池。这项研究强调了电活性离子液体在锂离子电池电解质中作为高度可溶且稳定的功能性添加剂的潜力。