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Stabilization of gamma sulfur at room temperature

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Stabilization of gamma sulfur at room temperature ( stabilization-gamma-sulfur-at-room-temperature )

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ARTICLE https://doi.org/10.1038/s42004-022-00626-2 OPEN Stabilization of gamma sulfur at room temperature to enable the use of carbonate electrolyte in Li-S batteries Rahul Pai1, Arvinder Singh1, Maureen H. Tang1 & Vibha Kalra1✉ This past decade has seen extensive research in lithium-sulfur batteries with exemplary works mitigating the notorious polysulfide shuttling. However, these works utilize ether electrolytes that are highly volatile severely hindering their practicality. Here, we stabilize a rare monoclinic γ-sulfur phase within carbon nanofibers that enables successful operation of Lithium-Sulfur (Li-S) batteries in carbonate electrolyte for 4000 cycles. Carbonates are known to adversely react with the intermediate polysulfides and shut down Li-S batteries in first discharge. Through electrochemical characterization and post-mortem spectroscopy/ microscopy studies on cycled cells, we demonstrate an altered redox mechanism in our cells that reversibly converts monoclinic sulfur to Li2S without the formation of intermediate polysulfides for the entire range of 4000 cycles. To the best of our knowledge, this is the first study to report the synthesis of stable γ-sulfur and its application in Li-S batteries. We hope that this striking discovery of solid-to-solid reaction will trigger new fundamental and applied research in carbonate electrolyte Li-S batteries. 1 Department of Chemical and Biological Engineering, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA. ✉email: vk99@drexel.edu COMMUNICATIONS CHEMISTRY | (2022)5:17 | https://doi.org/10.1038/s42004-022-00626-2 | www.nature.com/commschem 1 Content courtesy of Springer Nature, terms of use apply. Rights reserved 1234567890():,;

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