期刊
CHEMSUSCHEM
卷 14, 期 5, 页码 1404-1413出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202002731
关键词
batteries; electrode materials; lithium sulfides; yolk-shell nanostructures
资金
- Humboldt Research Fellowship for Postdoctoral Researchers from the Alexander von Humboldt Foundation
- CSC scholarship
- Projekt DEAL
This study introduced a simple route to synthesize a series of sulfur host materials with the same yolk-shell nanospindle morphology but tunable compositions for investigating the specific effect of chemical composition on the electrochemical performances of Li-S batteries. The S/FeS2-C electrode exhibited the best performance with an initial capacity of 877.6 mAh/g at 0.5 C and a retention ratio of 86.7% after 350 cycles, showing the potential for optimizing materials for other functionalities and applications.
Numerous nanostructured materials have been reported as efficient sulfur hosts to suppress the problematic shuttling of lithium polysulfides (LiPSs) in lithium-sulfur (Li-S) batteries. However, direct comparison of these materials in their efficiency of suppressing LiPSs shuttling is challenging, owing to the structural and morphological differences between individual materials. This study introduces a simple route to synthesize a series of sulfur host materials with the same yolk-shell nanospindle morphology but tunable compositions (Fe3O4, FeS, or FeS2), which allows for a systematic investigation into the specific effect of chemical composition on the electrochemical performances of Li-S batteries. Among them, the S/FeS2-C electrode exhibits the best performance and delivers an initial capacity of 877.6 mAh g(-1) at 0.5 C with a retention ratio of 86.7 % after 350 cycles. This approach can also be extended to the optimization of materials for other functionalities and applications.
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