Applications of Porous Glass Membranes in Redox-Flow-Batteries - Investigations on the Influence of Membrane Thickness, Pore Structure and Surface Modification

多孔玻璃膜在氧化还原液流电池中的应用——膜厚度、孔结构和表面改性影响的研究

• 批准号: 267002041
• 负责人: Professor Dr. Dirk Enke
• 金额: --
• 依托单位: Institut für Technische Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/267002041?language=en
• 关键词: Applications; Porous; Glass; Membranes; Redox

In an abstract of the 3rd sub-report of the 5th assessment report of the IPCC from 13.04.2014 it is stated that the greenhouse gas emission is rapidly increasing, though continuous work on climate protection. Therefore, it is necessary to intensify the activities in the field of regenerative energy. Just as important as power generation is also its storage. Redox-Flow-Batteries (RFB) are particularly suited for this purpose, showing high efficiencies as well as relatively low costs compared with, for example, Lithium ion batteries. Their modular design facilitates the production of stacks with few individual to several hundreds of parallel and serial cells. Though, such cells still show deficiencies, like relatively low current densities, high material costs of the used membranes as well as an ion crossover through the membrane, which leads to the formation of mixed potentials and thus to contamination of the electrolytes used. While the electrolyte systems in RFBs have continuously been enhanced and optimized, the separators used still mainly consist of nonporous and expensive Nafion®. Although other materials and composites are examined regarding their applicability as separators/membranes, these are mainly polymer based.Mechanically and chemically stable porous glasses (PG) are almost not investigated, even though they show a variety of benefits. Porous glass membranes provide the possibility of the flexible modification of their macroscopic geometry, pore sizes and surface properties. Hence porous glass membranes should be fully adaptable to the conditions in RFBs. The use of PG membranes allows high current densities and conductivities and the prevention of ion crossover by adjusting adequate surface properties. Thus, PG membranes represent an ideal model system for systematic investigations on the influence of different parameters, like porosity, pore size, pore structure, membrane thickness, surface charge, surface energy, etc., on the performance of RFBs, which is discussed controversially in the scientific literature.Therefore, we think it is reasonable to combine these two modern technologies in a novel way. For this purpose, porous glass membrane with tailor-made properties will be produced and investigated in a Vanadium Redox-Flow-Battery. The obtained results will be compared to those estimated for Nafion® membranes under the same conditions.

在2014年4月13日IPCC第5次评估报告的第3分报告摘要中指出，尽管在气候保护方面不断努力，但温室气体排放正在迅速增加。因此，有必要加大可再生能源领域的活动力度。与发电一样重要的还有它的储能。氧化还原液流电池(RFB)特别适合于这一目的，与锂离子电池相比，表现出高效率和相对较低的成本。它们的模块化设计便于生产具有几个到数百个并行和串联单元的堆栈。然而，这种电池仍然存在缺陷，如相对较低的电流密度，使用的膜的材料成本较高，以及离子通过膜的渗透，这导致混合电位的形成，从而污染所用的电解液。虽然RFB中的电解液系统不断得到改进和优化，但使用的分离器仍主要由价格昂贵的无孔Nafion®组成。虽然研究了其他材料和复合材料作为分离剂/膜的适用性，但这些主要是基于聚合物的。力学和化学稳定的多孔玻璃(PG)几乎没有被研究，尽管它们显示出各种好处。多孔玻璃膜提供了对其宏观几何形状、孔径大小和表面性质进行灵活修改的可能性。因此，多孔玻璃膜应完全适应RFBS的条件。PG膜的使用允许高电流密度和电导率，并通过调节适当的表面性质来防止离子交叉。因此，PG膜代表了一个理想的模型系统，可以系统地研究不同的参数，如孔隙率、孔径、孔结构、膜厚度、表面电荷、表面能等对RFBS性能的影响，这在科学文献中是有争议的。因此，我们认为以一种新的方式结合这两种现代技术是合理的。为此，将在钒氧化还原液流电池中制备并研究具有特制性能的多孔玻璃薄膜。将获得的结果与相同条件下对Nafion®膜的估计结果进行比较。

项目成果

Effect of the pore size and surface modification of porous glass membranes on vanadium redox-flow battery performance

多孔玻璃膜孔径和表面改性对全钒氧化还原液流电池性能的影响

• DOI: 10.1007/s10800-018-1201-7
• 发表时间: 2018
• 期刊: Journal of Applied Electrochemistry
• 影响因子: 2.9
• 作者: Mögelin;Barascu;Krenkel
• 通讯作者: Krenkel

Porous glass membranes for vanadium redox-flow battery application - Effect of pore size on the performance

• DOI: 10.1016/j.jpowsour.2017.12.001
• 发表时间: 2018-02
• 期刊: Journal of Power Sources
• 影响因子: 9.2
• 作者: H. Mögelin;G. Yao;H. Zhong;A. R. Santos;A. Barascu;Ralf Meyer;S. Krenkel;Susan Wassersleben;T. Hickmann;D. Enke;T. Turek;U. Kunz