Details

Autor(en) / Beteiligte

• Xiang, Yinyu
• Lu, Liqiang
• Zhang, Yongsheng
• Ersek, Gabor
• Portale, Giuseppe
• Li, Wenjian
• Zhang, Wei
• Kottapalli, Ajay Giri Prakash
• Pei, Yutao

Titel

Insights into the aspect ratio effects of ordered mesoporous carbon on the electrochemical performance of sulfur cathode in lithium-sulfur batteries

Ist Teil von

• Journal of colloid and interface science, 2024-07, Vol.665, p.286-298

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Aspect ratio of OMCs is tuned, and correlations between aspect ratio of OMCs and battery performance of S@OMCs are systematically studied. Evolution of sulfur species in OMCs is revealed by SAXS, providing guidelines for optimizing sulfur cathodes. [Display omitted] Tailoring porous host materials, as an effective strategy for storing sulfur and restraining the shuttling of soluble polysulfides in electrolyte, is crucial in the design of high-performance lithium-sulfur (Li-S) batteries. However, for the widely studied conductive hosts such as mesoporous carbon, how the aspect ratio affects the confining ability to polysulfides, ion diffusion as well as the performances of Li-S batteries has been rarely studied. Herein, ordered mesoporous carbon (OMC) is chosen as a proof-of-concept prototype of sulfur host, and its aspect ratio is tuned from over ∼ 2 down to below ∼ 1.2 by using ordered mesoporous silica hard templates with variable length/width scales. The correlation between the aspect ratio of OMCs and the electrochemical performances of the corresponding sulfur-carbon cathodes are systematically studied with combined electrochemical measurements and microscopic characterizations. Moreover, the evolution of sulfur species in OMCs at different discharge states is scrutinized by small-angle X-ray scattering. This study gives insight into the aspect ratio effects of mesoporous host on battery performances of sulfur cathodes, providing guidelines for designing porous host materials for high-energy sulfur cathodes.