Water in Protic Ionic Liquids: Properties and Use of a New Class of Electrolytes for Energy-Storage Devices.,ChemSusChem

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Water in Protic Ionic Liquids: Properties and Use of a New Class of Electrolytes for Energy-Storage Devices.
ChemSusChem ( IF 7.5 ) Pub Date : 2019-07-17 , DOI: 10.1002/cssc.201901283
Timo Stettner _{1,

2} , Sascha Gehrke ₃ , Promit Ray ₃ , Barbara Kirchner ₃ , Andrea Balducci _{1,

2}

Affiliation

In this work, the properties of "water-in-PIL" (PIL=protic ionic liquid) electrolytes are reported based on 1-butylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PyrH4 TFSI). Taking advantage of experimental and theoretical investigations, it is shown that the amount of water inside the electrolyte has a dramatic effect on the viscosity, conductivity, density, cation-anion interplay, and electrochemical stability of PyrH4 TFSI. The impact of water on the properties of this ionic liquid also affects its use as an electrolyte for electrochemical double-layer capacitors (EDLCs). It is shown that the presence of water improves the transport properties of PyrH4 TFSI, with a beneficial effect on the capacitance retention of the devices in which these electrolytes are used. However, at the same time, water reduces the operative voltage of EDLCs containing this PIL as the electrolyte and, furthermore, it has a strong impact on the inactive components of these systems. To suppress this latter problem, and to realize EDLCs with high stability, the use of inactive components stable in aqueous environment appears necessary.

中文翻译：

质子离子液体中的水：用于储能装置的新型电解质的性质和用途。

在这项工作中，基于1-丁基吡咯烷鎓双（三氟甲磺酰基）酰亚胺（PyrH4 TFSI）报道了“ PIL中水”（PIL =质子离子液体）电解质的特性。利用实验和理论研究的结果表明，电解液中的水量对PyrH4 TFSI的粘度，电导率，密度，阳离子-阴离子相互作用和电化学稳定性具有显着影响。水对这种离子液体性能的影响也影响了其用作电化学双层电容器（EDLC）的电解质的用途。结果表明，水的存在改善了PyrH4 TFSI的传输性能，对使用这些电解质的设备的电容保持率产生了有益的影响。但是，与此同时，水会降低含有该PIL作为电解质的EDLC的工作电压，此外，它对这些系统的非活性成分也有很大的影响。为了抑制后一个问题，并实现具有高稳定性的EDLC，似乎需要使用在水性环境中稳定的非活性组分。

更新日期：2019-07-17

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