Single-Atomic Dispersion of Fe and Co Supported on Reduced Graphene Oxide for High-Performance Lithium–Sulfur Batteries - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ACS Applied Materials & Interfaces Année : 2023

Single-Atomic Dispersion of Fe and Co Supported on Reduced Graphene Oxide for High-Performance Lithium–Sulfur Batteries

Résumé

High theoretical energy density and low cost make lithium-sulfur (LSB) batteries a promising system for next-generation energy storage. LSB performance largely depends on efficient reversible conversion of elemental sulfur to Li2S. Here, well-designed sulfur host materials including Fe or Co single atoms embedded on N-doped reduced graphene oxide (MNC/G with M = Fe, Co) are proposed to tackle the LSB challenges and enhance its electrochemical performance. Using a combination of, Mössbauer spectroscopy and high-resolution scanning electron microscopy (HR-STEM), the atomic dispersion of Co and Fe was revealed up to relatively high mass loadings. After optimization of the electrolyte/sulfur (E/S) ratio, FeNC/G shows the most promising cycle performance combining a constant high discharge capacity at low E/S values with the lowest polarization. In particular, the material FeNC/G@S with a high sulfur loading (9.4 mg cm-2) delivers a high area capacity of 7.7 mAh cm-2 under lean electrolyte condition (6 mL g-1).

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hal-04227549 , version 1 (03-10-2023)

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Sajad Rahimi, Lorenzo Stievano, Laetitia Dubau, Cristina Iojoiu, Lauréline Lecarme, et al.. Single-Atomic Dispersion of Fe and Co Supported on Reduced Graphene Oxide for High-Performance Lithium–Sulfur Batteries. ACS Applied Materials & Interfaces, 2023, 15 (38), pp.44932-44941. ⟨10.1021/acsami.3c08669⟩. ⟨hal-04227549⟩
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