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| Pàgina inicial > Articles > Articles publicats > Combined High Catalytic Activity and Efficient Polar Tubular Nanostructure in Urchin-Like Metallic NiCo2Se4 for High-Performance Lithium-Sulfur Batteries |
| Data: | 2019 |
| Resum: | Urchin-shaped NiCoSe (u-NCSe) nanostructures as efficient sulfur hosts are synthesized to overcome the limitations of lithium-sulfur batteries (LSBs). u-NCSe provides a beneficial hollow structure to relieve volumetric expansion, a superior electrical conductivity to improve electron transfer, a high polarity to promote absorption of lithium polysulfides (LiPS), and outstanding electrocatalytic activity to accelerate LiPS conversion kinetics. Owing to these excellent qualities as cathode for LSBs, S@u-NCSe delivers outstanding initial capacities up to 1403 mAh g at 0. 1 C and retains 626 mAh g at 5 C with exceptional rate performance. More significantly, a very low capacity decay rate of only 0. 016% per cycle is obtained after 2000 cycles at 3 C. Even at high sulfur loading (3. 2 mg cm), a reversible capacity of 557 mAh g is delivered after 600 cycles at 1 C. Density functional theory calculations further confirm the strong interaction between NCSe and LiPS, and cytotoxicity measurements prove the biocompatibility of NCSe. This work not only demonstrates that transition metal selenides can be promising candidates as sulfur host materials, but also provides a strategy for the rational design and the development of LSBs with long-life and high-rate electrochemical performance. |
| Ajuts: | European Commission 666221 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1246 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327 Agencia Estatal de Investigación ENE2016-77798-C4-3-R Ministerio de Economía y Competitividad ENE2017-85087-C3 Ministerio de Economía y Competitividad SEV-2017-0706 |
| 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: | Catalytic effect ; Hollow nanostructure ; Lithium-sulfur batteries ; Nickel-cobalt selenide ; Polarity |
| Publicat a: | Advanced functional materials, Vol. 29, Issue 34 (August 2019) , art. 1903842, ISSN 1616-3028 |
Preprint 36 p, 2.1 MB |