论文标题
液体金属电池中的溶质和热对流之间的层耦合
Layer coupling between solutal and thermal convection in liquid metal batteries
论文作者
论文摘要
十多年来，液态金属电池（LMB）的开发为主要目的，目的是提供经济固定的能源存储。 LMB具有两种由熔融盐电解质分离的液态金属电极，作为简单浓度细胞在升高的温度下运行。因此，有效的传质是其经济运作的基本先决条件。了解这些机制不能在单层级别受到限制。通过这种动机，研究了溶质和热驱动流的影响，以及细胞的三个液体层之间的流量耦合。结果表明，溶质对流是首先出现的，而热对流则很晚。虽然溶质流的存在取决于操作模式（电荷或排放），但热对流的发生是由几何形状（层的厚度）决定的。层之间流动现象的耦合很有趣：虽然热对流仅限于其原点区域，即电解质，溶质对流能够驱动正极电极和电解质中的流动。
For longer than one decade, liquid metal batteries (LMBs) are developed with the primary aim to provide economic stationary energy storage. Featuring two liquid metal electrodes separated by a molten salt electrolyte, LMBs operate at elevated temperature as simple concentration cells. Therefore, efficient mass transfer is a basic prerequisite for their economic operation. Understanding these mechanisms cannot be limited at the single layer level. With this motivation, the effects of solutal- and thermally-driven flow are studied, as well as the flow coupling between the three liquid layers of the cell. It is shown that solutal convection appears first and thermal convection much later. While the presence of solutal flow depends on the mode of operation (charge or discharge), the occurrence of thermal convection is dictated by the geometry (thickness of layers). The coupling of the flow phenomena between the layers is intriguing: while thermal convection is confined to its area of origin, i.e. the electrolyte, solutal convection is able to drive flow in the positive electrode and in the electrolyte.
