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Probing the “Universal” Amorphization of Crystalline Sulfur in its Mixture with Ultrahigh Surface Area Porous Carbon

Pal, N and Bhattacharyya, AJ (2023) Probing the “Universal” Amorphization of Crystalline Sulfur in its Mixture with Ultrahigh Surface Area Porous Carbon. In: Journal of Physical Chemistry C, 127 (12). pp. 5713-5719.

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Official URL: https://doi.org/10.1021/acs.jpcc.3c00276


We discuss here a fundamental observation regarding the time-dependent amorphization of sulfur in contact with ultrahigh surface area porous carbon. The simple sulfur-carbon mixture discussed here effectively resembles a sulfur-cathode in metal-sulfur batteries. Systematic time dependent powder X-ray diffraction and Raman spectroscopy clearly reveal a crystalline to amorphous phase transition, which has been recently referred as a liquid spillover effect. The occurrence of the structural phase transformation only above a certain carbon surface area (≥2000-3000 m2/g) in the binary sulfur-carbon mixture is equivalent to a “universal” phenomenon, having deep implications in metal-sulfur battery electrochemistry. As revealed by thermal and electron paramagnetic resonance measurements, the (nonpolar) interactions between sulfur and carbon induces a transformation from crystalline orthorhombic to a highly dispersed amorphous phase comprising of small chain sulfur radicals. Amorphization leads to higher degree of sulfur-mass utilization and effective polysulfide management resulting in superior specific capacity of the sulfur-cathode in a Li-S battery. © 2023 American Chemical Society.

Item Type: Journal Article
Publication: Journal of Physical Chemistry C
Publisher: American Chemical Society
Additional Information: The copyright for this article belongs to American Chemical Society.
Keywords: Amorphization; Carbon; Lithium compounds; Lithium sulfur batteries; Paramagnetic resonance; Porous materials, Amorphizations; Amorphous phasis; Carbon mixtures; Crystalline-to-amorphous; Porous carbons; Simple++; Spillover effects; Sulfur cathodes; Surface area; Time dependent, Cathodes
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 25 Apr 2023 07:02
Last Modified: 25 Apr 2023 07:02
URI: https://eprints.iisc.ac.in/id/eprint/81389

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