Boosting(机器学习)
材料科学
硫黄
分离器(采油)
计算机科学
冶金
物理
人工智能
热力学
作者
Hong He,Wei Wang,Xiaobei Guo
出处
期刊:Inorganics (Basel)
[Multidisciplinary Digital Publishing Institute]
日期:2024-08-14
卷期号:12 (8): 218-218
标识
DOI:10.3390/inorganics12080218
摘要
Lithium–sulfur batteries (LSBs) hold promise for use in next-generation high-energy-density energy storage systems. However, the commercial application of LSBs is hindered by the shuttle effect of polysulfides. In this study, we synthesized a covalent organic framework material (PY−DHBD−COF) and employed it to modify the separators of LSBs in order to buffer the shuttle effect of polysulfides. A modified separator, involving PY−DHBD−COF coating of the commercial Celgard 2500 PP separator, is prepared via a vacuum-assisted self-assembly method. The PY−DHBD−COF features hydroxyl and imine bonds, which can adsorb lithium polysulfides (LiPSs) and buffer the shuttle effect. The PY−DHBD−COF coating exhibits a thin thickness and oriented nanochannels, facilitating electrolyte wetting and Li+ transport. As a result, the LSBs with PY−DHBD−COF-modified separators exhibit a high specific capacity of 373 mAh g−1 at 4 C with only 0.005% capacity decay per cycle after 450 cycles at 2 C, demonstrating an excellent cycling performance.
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