Lee Pui Lap Jacob, Thangavel Vigneshwaran, Guery Claude, Trautmann Christina, Toimil-Molares Maria Eugenia, Morcrette Mathieu
Materialforschung, GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, D-64291 Darmstadt, Germany.
Material- und Geowissenschaften, Technische Universität Darmstadt, Alarich-Weiss-Straße 2, D-64287 Darmstadt, Germany.
Nanotechnology. 2021 Jun 14;32(36). doi: 10.1088/1361-6528/ac04a3.
Lithium-sulfur (Li-S) batteries are considered a promising next generation alternative to lithium-ion batteries for energy storage systems due to its high energy density. However, several challenges, such as the polysulfide redox shuttle causing self-discharge of the battery, remain unresolved. In this paper, we explore the use of polymer etched ion-track membranes as separators in Li-S batteries to mitigate the redox shuttle effect. Compared to commercial separators, their unique advantages lie in their very narrow pore size distribution, and the possibility to tailor and optimize the density, geometry, and diameter of the nanopores in an independent manner. Various polyethylene terephthalate membranes with diameters between 22 and 198 nm and different porosities were successfully integrated into Li-S coin cells. The reported coulombic efficiency of up to 97% with minor reduction in capacity opens a pathway to potentially address the polysulfide redox shuttle in Li-S batteries using tailored membranes.
锂硫（Li-S）电池因其高能量密度，被认为是储能系统中下一代锂离子电池的一个有前景的替代品。然而，一些挑战，如多硫化物氧化还原穿梭导致电池自放电，仍未得到解决。在本文中，我们探索使用聚合物蚀刻离子径迹膜作为锂硫电池的隔膜，以减轻氧化还原穿梭效应。与商业隔膜相比，它们的独特优势在于其极窄的孔径分布，以及能够以独立的方式定制和优化纳米孔的密度、几何形状和直径。各种直径在22至198纳米之间且孔隙率不同的聚对苯二甲酸乙二酯膜已成功集成到锂硫扣式电池中。报道的高达97%的库仑效率以及容量的轻微降低，为使用定制膜潜在解决锂硫电池中的多硫化物氧化还原穿梭问题开辟了一条途径。
