EDLstruct - Effect of carbon electrodes porous structure and electrolyte properties on the formation and composition of the electrical double-layer

EDLstruct - 碳电极多孔结构和电解质特性对双电层形成和组成的影响

• 批准号: 380691101
• 负责人: Professor Dr. Andrea Balducci
• 金额: --
• 依托单位: Institut für Technische Chemie und Umweltchemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/380691101?language=en
• 关键词: EDLstruct; Effect; carbon; electrodes; porous

The formation of an electrical double-layer (EDL) in a porous conductive electrode, e.g., from activated carbon (AC), represents one of the most appealing strategies for fast storage of energy and, consequently, for the realization of high power energy storage devices. However, the existing models of EDL which consider the electrolyte border with a flat surface cannot be applied to the case of microporous (<2 nm) AC electrodes. Recently, in-situ techniques have provided important information about the EDL properties in AC electrodes, yet they were implemented with a unique electrolyte and a unique type of porous carbon. Therefore, the objective of the EDLstruct project is to implement a variety of organic electrolytes with a variety of carbons of well-defined porous structure in order to study: i) the influence of pore size and molecules size on the ions/solvent ratio under polarization, and ii) to find correlations between the EDL structure and the decay of electrochemical performance of carbon electrodes depending on temperature and electrodes potential. In order to realize this program, strong competence in carbonaceous materials (PUT group) as well as in electrolytes (FSU Jena group) is needed. In addition, the use of in-operando techniques (PUT) is required to monitor the effects of molecular fluxes and EDL decomposition during polarization of electrodes. Hence, the research objectives will be reached by conducting 5 work packages. FSU Jena will design a number of non-aqueous electrolytes (WP1), while PUT will design and characterize ACs with different structural properties (WP2). The electrochemical performance of AC electrodes in combination with the considered electrolytes will be investigated by both groups. In order to acquire information about the double-layer formation, post-mortem analyses of polarized electrodes by thermoprogrammed desorption and in-operando electrical dilatometry will be carried out by PUT (WP3). The influence of the electrode-electrolyte interaction on the thermal stability of the double-layer will be investigated in WP4 by FSU Jena (TGA/DSC) and PUT (electrochemical on-line mass spectrometry). The experimental results will be critically discussed in WP5, giving rise to publications and presentations at international conferences.

在多孔导电电极中形成双电层(EDL)，例如由活性碳(AC)形成，是实现快速储能和实现高功率储能装置的最有吸引力的策略之一。然而，现有的考虑电解质与平坦表面边界的EDL模型不能适用于微孔(&lt；2 nm)交流电极的情况。最近，原位技术已经提供了关于交流电极中EDL性质的重要信息，但它们是通过独特的电解液和独特类型的多孔碳来实现的。因此，EDLstruct项目的目标是实现各种具有明确孔结构的碳的有机电解液，以研究：i)极化下孔径和分子大小对离子/溶剂比的影响，以及ii)EDL结构与碳电极电化学性能随温度和电极电位的衰减之间的相关性。为了实现这一计划，需要在碳质材料(PUT组)和电解液(FSU JENA组)方面具有很强的竞争力。此外，需要使用操作内技术(PUT)来监测电极极化过程中分子熔剂和EDL分解的影响。因此，将通过5个工作包来实现研究目标。FSU Jena将设计一系列非水电解质(WP1)，而Put将设计和表征具有不同结构特性的AC(WP2)。交流电极与所考虑的电解液相结合的电化学性能将由两个小组进行研究。为了获得有关双层形成的信息，将使用Put(WP3)对极化电极进行程序升温脱附和术中电膨胀测量的尸检分析。用FSU JENA(TGA/DSC)和PUT(电化学在线质谱仪)研究了电极-电解液相互作用对WP4中双层膜热稳定性的影响。WP5将对实验结果进行批判性讨论，并在国际会议上发表出版物和发表演讲。