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Eutectic mixtures of ionic liquids electrolytes for electric double layer capacitors

机译：双电层电容器用离子液体电解质的低共熔混合物

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Eutectic mixtures of oxygen-containing spirobipyrrolidinium-based ionic liquids were investigated as prospective room temperature ionic liquid electrolytes (RTILs) for supercapacitor application. These in-house developed novel ionic liquids (IL) possess wide voltage window (6-7 V) and solubility (3-5.5 M) in conventional solvents, such as acetonitrile and propylene carbonate. The potential window of mixed RTIL was about 5.5 V (at 50 μA/cm~2 threshold). The RTIL mixtures exhibit higher breakdown potential (＞ 4.6 V) as compared to conventional molecular solvent (acetonitrile)-based cells (～4.0 V) in supercapacitor tests. However, these RTIL mixtures (neat, i.e. w/o any solvent addition) lead to high equivalent series resistance (ESR) initiating around 3.9 V and lower capacitance. Cycling of the negative electrode at 4.6 V led to degradation of the active carbon material, while the positive electrode maintained its integrity.
机译：研究了含氧螺旋吡咯烷鎓基离子液体的共晶混合物，作为用于超级电容器的预期室温离子液体电解质（RTIL）。这些内部开发的新型离子液体（IL）具有宽的电压窗口（6-7 V）和在常规溶剂（如乙腈和碳酸亚丙酯）中的溶解度（3-5.5 M）。混合RTIL的电位窗口约为5.5 V（在50μA/ cm〜2阈值下）。与传统的基于分子溶剂（乙腈）的电池（〜4.0 V）相比，RTIL混合物显示出更高的击穿电位（＞ 4.6 V）。但是，这些RTIL混合物（纯净，即不添加任何溶剂）会导致3.9 V左右的高等效串联电阻（ESR），并降低电容。负极在4.6 V下循环导致活性炭材料降解，而正极则保持其完整性。

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    Seiichiro Higashiya; Thamaral selvi Devarajan; Manisha V. Rane-Fondacaro; Pradeep Haldar;

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    Energy and Environmental Technology Applications Center (E2TAC), College of Nanoscale Science and Engineering, University at Albany, 257 Fuller Road, Albany, New York 12203;

    Energy and Environmental Technology Applications Center (E2TAC), College of Nanoscale Science and Engineering, University at Albany, 257 Fuller Road, Albany, New York 12203;

    Energy and Environmental Technology Applications Center (E2TAC), College of Nanoscale Science and Engineering, University at Albany, 257 Fuller Road, Albany, New York 12203;

    Energy and Environmental Technology Applications Center (E2TAC), College of Nanoscale Science and Engineering, University at Albany, 257 Fuller Road, Albany, New York 12203;

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