Tailoring biphasic high-halogen SEI via organochlorine isomeric effect for stable lithium metal anodes
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Elsevier
Abstract
The fragile nature of the solid electrolyte interphase (SEI) formed on lithium metal anodes, particularly due to irregular lithium deposition and sluggish ion transport, presents a major challenge to the wider deployment of lithium-sulfur (Li-S) batteries. In this study, a high halogen-containing SEI of the lithium anode was prepared and finely tuned using the variance in chlorine substitution sites as a regulatory mechanism with the positional isomerism of dichloropyridines (DCPs). Remarkably, a highly halogenated inorganic layer was composed predominantly of LiF and LiCl, reaching up to 62 % coverage, which not only mitigated lithium dendrite proliferation and accommodated volume changes during cycling but also facilitated efficient Li+ ion conduction. Under demanding conditions with a high sulfur loading of 3.0 mg cm−2 and a lean electrolyte ratio (electrolyte to sulfur ratio = 13.3 μL mg−1), the cells retained a capacity of 520.65 mA h g−1 after 300 cycles at 0.5 C.
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Keywords
Solid electrolyte interphase (SEI), Lithium anode, Dichloropyridine isomers, High-halogen interfaces
Sustainable Development Goals
SDG-07: Affordable and clean energy
Citation
Liang, Y., Liu, F., Ren, J. et al. 2025, 'Tailoring biphasic high-halogen SEI via organochlorine isomeric effect for stable lithium metal anodes', Journal of Energy Chemistry, vol. 111, pp. 316-327, doi : 10.1016/j.jechem.2025.07.073.