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Mechanistic Insights into the Cycling Behavior of Sulfur Dry‐Film Cathodes

机译：硫干膜阴极循环行为的机理见解

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Abstract All‐solid‐state lithium–sulfur batteries (ASSB‐LiS batteries) are considered among advanced candidates for next‐generation energy storage systems, as they break with restrictions and limitations that liquid electrolytes impose on lithium‐ion batteries and lithium‐sulfur batteries (LiS‐batteries), meaning enhanced safety and higher energy densities. However, investigations under realistic conditions on pouch cell level are challenging, as it is necessary to implement a scalable preparation method for sheet‐type cathodes with high sulfur utilization and loading. In this study, a solvent‐free process to prepare free‐standing cathode sheets with low binder content down to 0.1 wt% PTFE is demonstrated. The contribution of binder and electrolyte on the conversion reaction of sulfur is discussed. Sheet‐type cathodes reach nearly theoretical sulfur utilization of 1672 mAh gS−1 and outstanding reversible capacity retention with 72% of initial discharge capacity after 400 cycles by adapting cut‐off voltages to the stability window of the electrolyte. Furthermore, an all‐solid‐state pouch cell is demonstrated using the dry‐film cathode, which is successfully tested for 50 cycles at different C‐rates. Thickness monitoring of the cell stack gives fundamental insights into the volume change and breathing behavior of both cathode and anode.
机译：抽象的所有检测固体量锂硫电池状态(地理ASSB LiS电池)被认为是先进的候选人第二代能源存储系统,因为他们打破限制和限制液体电解质在锂离子电池和锂硫电池(LiS)检测电池),这意味着增强安全与更高的能量密度。在现实条件下调查囊细胞水平是具有挑战性的,因为它是需要实现一个可伸缩的准备表式阴极与高硫的方法利用率和加载。溶剂量免费过程准备免费站阴极表与粘结剂含量低下来0.1 wt %聚四氟乙烯。粘结剂和电解质的转换反应讨论了硫。近理论硫的利用率1672 mAh gS−1和杰出的可逆容量保留72%的初始放电容量400年之后切断量电压适应周期电解液的稳定性窗口。此外,一个所有固体状态囊细胞演示了使用干量薄膜阴极,成功测试了50周期不同C的利率。给出了基本见解体积变化和呼吸行为的阴极和阳极。

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