WCAcaps - From fundamental research to application...? Using electrochemically and temperature stable novel fluorinated aluminate salts as electrolytes for super-capacitors

近年来的研究表明，基于电化学稳定的离子液体电解质的超级电容器优于许多传统的溶剂基材料。在这个项目中，我们希望应用一种新的阴离子类型，氟化烷氧铝酸盐[A1(0RF)4]-(特别是RF = C(H)(CF3)2和C(CF3)3)，过去主要用作弱配位阴离子（WCA）来制备化学反应性很强的阳离子的稳定盐，作为电双层电容器（EDLC）的电解质。WCAs [A1(0RF')4]-家族的几种盐形成具有低粘度和高导电性的室温离子液体。此外，这些wca在电化学上非常稳定（例如，与Li/Li+相比，高达+5.5 V）。这些特点表明，这些价格适中的wca具有巨大的潜力，可以作为EDLC器件的有利电解质。此外，不同的RF可以改变wca的尺寸，因此也可以详细研究固体电极中孔径的影响。在项目期间，将开发三代[Al(ORF)4]-电解质，并在edlc中进行全面测试。每一代之后，都要对EDLC器件的性能进行仔细的评估，评估结果应与所使用的WCA电解质的物理性质以及电极材料相关联。对WCA电解质失败或成功的原因的理解应得到相关性质的量子化学计算的支持。

Recent research showed that supercapacitors based on electrochemically stable Ionic Liquid electrolytes are superior lo many conventional solvent based materials.With this project we want to apply a novel anion type, the fluorinated alkoxyaluminates [A1(0RF)4]- (especially RF = C(H)(CF3)2 and C(CF3)3), that was used in the past primarily as weakly coordinating anion (WCA) to prepare stable salts of chemically very reactive cations, as electrolytes for electrical double-layer capacitors (EDLC). Several of salts of the [A1(0RF')4]- family of WCAs form room temperature Ionic Liquids with low viscosity and high conductivity. Moreover, these WCAs are electrochemically very stable (e.g. up to +5.5 V vs. Li/Li+).These features point to a great potential of these also moderately priced WCAs to act as favourable electrolytes for EDLC devices. Also the size of the WCAs may be changed by varying RF and thus the effect of pore sizes in the solid electrodes may also be investigated in detail. During the project, three subsequent generations of [Al(ORF )4]- electrolytes shall be developed and fully tested in EDLCs. After each generation a careful assessment of the performance of the EDLC devices shall be done and results should be correlated with physical properties of the used WCA electrolytes as well as the electrode materials. An understanding of the reasons for failure or success of the WCA electrolytes shall be supported by quantum chemical calculations of relevant properties.