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| Pàgina inicial > Articles > Articles publicats > Anionic Doping in Layered Transition Metal Chalcogenides for Robust Lithium-Sulfur Batteries |
| Data: | 2025 |
| Resum: | Lithium-sulfur batteries (LSBs) are among the most promising next-generation energy storage technologies. However, a slow Li-S reaction kinetics at the LSB cathode limit their energy and power densities. To address these challenges, this study introduces an anionic-doped transition metal chalcogenide as an effective catalyst to accelerate the Li-S reaction. Specifically, a tellurium-doped, carbon-supported bismuth selenide with Se vacancies (Te-Bi2Se3-x@C) is prepared and tested as a sulfur host in LSB cathodes. X-ray absorption and in situ X-ray diffraction analyses reveal that Te doping induces lattice distortions and modulates the local coordination environment and electronic structure of Bi atoms to promote the catalytic activity toward the conversion of polysulfides. Additionally, the generated Se vacancies alter the electronic structure around atomic defect sites, increase the carrier concentration, and activate unpaired cations to effectively trap polysulfides. As a result, LSBs based on Te-Bi2Se3-x@C/S cathodes demonstrate outstanding specific capacities of 1508 mAh ⋅ g-1 at 0. 1 C, excellent rate performance with 655 mAh ⋅ g-1 at 5 C, and near-integral cycle stability over 1000 cycles. Furthermore, under high sulfur loading of 6. 4 mg ⋅ cm-2, a cathode capacity exceeding 8 mAh ⋅ cm-2 is sustained at 0. 1 C current rate, with 6. 4 mAh ⋅ cm-2 retained after 300 cycles under lean electrolyte conditions (6. 8 μL ⋅ mg-1). |
| Ajuts: | Agencia Estatal de Investigación PCI2022-132985 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-01581 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00457 Agencia Estatal de Investigación CEX2021-001214-S Agencia Estatal de Investigación PID2023-149158OB-C43 Ministerio de Ciencia e Innovación CEX2019-000917-S Agencia Estatal de Investigación PID2021-128410OB-I00 |
| Nota: | Altres ajuts: CERCA Programme/Generalitat de Catalunya; European Union Next Generation EU (PRTRC17.I1); funding from Grant IU16-014206 (METCAM-FIB) |
| Drets: | Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets. |
| Llengua: | Anglès |
| Document: | Article ; recerca ; Versió sotmesa a revisió |
| Matèria: | Lithium-sulfur battery ; Induced lattice ; Bi2Se3 ; Se vacancies ; Lithium polysulfides |
| Publicat a: | Angewandte Chemie (International ed. Internet), Vol. 64, Issue 8 (February 2025) , art. e202420488, ISSN 1521-3773 |
Preprint 30 p, 4.0 MB |