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Pàgina inicial > Articles > Articles publicats > Atomically dispersed Fe in a C2N based catalyst as a sulfur host for efficient lithium-sulfur batteries |
Data: | 2021 |
Resum: | Lithium-sulfur batteries (LSBs) are considered to be one of the most promising next generation energy storage systems due to their high energy density and low material cost. However, there are still some challenges for the commercialization of LSBs, such as the sluggish redox reaction kinetics and the shuttle effect of lithium polysulfides (LiPS). Here a 2D layered organic material, CN, loaded with atomically dispersed iron as an effective sulfur host in LSBs is reported. X-ray absorption fine spectroscopy and density functional theory calculations prove the structure of the atomically dispersed Fe/CN catalyst. As a result, Fe/CN-based cathodes demonstrate significantly improved rate performance and long-term cycling stability. Fe/CN-based cathodes display initial capacities up to 1540 mAh g at 0. 1 C and 678. 7 mAh g at 5 C, while retaining 496. 5 mAh g after 2600 cycles at 3 C with a decay rate as low as 0. 013% per cycle. Even at a high sulfur loading of 3 mg cm, they deliver remarkable specific capacity retention of 587 mAh g after 500 cycles at 1 C. This work provides a rational structural design strategy for the development of high-performance cathodes based on atomically dispersed catalysts for LSBs. |
Ajuts: | European Commission 823717 European Commission 665919 Ministerio de Ciencia e Innovación RTI2018-093996-B-C31 Ministerio de Economía y Competitividad SEV-2017-0706 Ministerio de Economía y Competitividad ENE2017-85087-C3 Ministerio de Economía y Competitividad ENE2016-77798-C4-3-R Ministerio de Economía y Competitividad SEV-2013-0295-17-1 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1246 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-128 |
Nota: | Altres ajuts: ICN2 is funded by the CERCA Programme/Generalitat de Catalunya. Part of the present work has been performed in the framework of Universitat Autònoma de Barcelona Materials Science PhD program. J.L. is a Serra Húnter Fellow and is grateful to ICREA Academia program. |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió sotmesa a revisió |
Matèria: | Atomically dispersed iron ; Electrocatalytic polysulfide conversion ; Lithium-sulfur batteries ; Organic layered materials |
Publicat a: | Advanced Energy Materials, Vol. 11, issue 5 (Feb. 2021) , art. 2003507, ISSN 1614-6840 |
Preprint 28 p, 1.1 MB |