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Página principal > Artículos > Artículos publicados > NbSe2 meets C2N : |
Fecha: | 2021 |
Resumen: | The shuttle effect and sluggish conversion kinetics of lithium polysulfides (LiPS) hamper the practical application of lithium-sulfur batteries (LSBs). Toward overcoming these limitations, herein an in situ grown CN@NbSe heterostructure is presented with remarkable specific surface area, as a Li-S catalyst and LiPS absorber. Density functional theory (DFT) calculations and experimental results comprehensively demonstrate that CN@NbSe is characterized by a suitable electronic structure and charge rearrangement that strongly accelerates the LiPS electrocatalytic conversion. In addition, heterostructured CN@NbSe strongly interacts with LiPS species, confining them at the cathode. As a result, LSBs cathodes based on CN@NbSe/S exhibit a high initial capacity of 1545 mAh g at 0. 1 C. Even more excitingly, CN@NbSe/S cathodes are characterized by impressive cycling stability with only 0. 012% capacity decay per cycle after 2000 cycles at 3 C. Even at a sulfur loading of 5. 6 mg cm, a high areal capacity of 5. 65 mAh cm is delivered. These results demonstrate that CN@NbSe heterostructures can act as multifunctional polysulfide mediators to chemically adsorb LiPS, accelerate Li-ion diffusion, chemically catalyze LiPS conversion, and lower the energy barrier for LiS precipitation/decomposition, realizing the "adsorption-diffusion-conversion" of polysulfides. |
Ayudas: | European Commission 754510 Ministerio de Ciencia e Innovación RTI2018-093996-B-C31 Ministerio de Economía y Competitividad ENE2017-85087-C3 Ministerio de Economía y Competitividad SEV-2017-0706 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 |
Derechos: | Tots els drets reservats. |
Lengua: | Anglès |
Documento: | Article ; recerca ; Versió sotmesa a revisió |
Materia: | C2N ; Heterostructures ; Lithium polysulfides ; Lithium-sulfur batteries ; Niobium selenides |
Publicado en: | Advanced Energy Materials, Vol. 11, issue 36 (Sep. 2021) , art. 2101250, ISSN 1614-6840 |
Preprint 32 p, 3.8 MB |