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Pàgina inicial > Articles > Articles publicats > Tubular CoFeP@CN as a Mott-Schottky catalyst with multiple adsorption sites for robust lithium−sulfur batteries |
Data: | 2021 |
Resum: | The shuttle effect and the sluggish reaction kinetics of lithium polysulfide (LiPS) seriously compromise the performance of lithium-sulfur batteries (LSBs). To overcome these limitations and enable the fabrication of robust LSBs, here the use of a Mott-Schottky catalyst based on bimetallic phosphide CoFeP nanocrystals supported on carbon nitride tubular nanostructures as sulfur hosts is proposed. Theoretical calculations and experimental data confirm that CoFeP@CN composites are characterized by a suitable electronic structure and charge rearrangement that allows them to act as a Mott-Schottky catalyst to accelerate LiPS conversion. In addition, the tubular geometry of CoFeP@CN composites facilitates the diffusion of Li ions, accommodates volume change during the reaction, and offers abundant lithiophilic/sulfiphilic sites to effectively trap soluble LiPS. Therefore, S@CoFeP@CN electrodes deliver a superior rate performance of 630 mAh g at 5 C, and remarkable cycling stability with 90. 44% capacity retention over 700 cycles. Coin cells with high sulfur loading, 4. 1 mg cm, and pouch cells with 0. 1 Ah capacities are further produced to validate their superior cycling stability. In addition, it is demonstrated here that CoFeP@CN hosts greatly alleviate the often overlooked issues of low energy efficiency and serious self-discharging in LSBs. |
Ajuts: | 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 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 Ministerio de Ciencia e Innovación RTI2018-093996-B-C31 |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió sotmesa a revisió |
Matèria: | Carbon nitrides ; Lithium-sulfur batteries ; Metal phosphides ; Mott-Schottky heterostructure ; Polysulfides ; Shuttle effect |
Publicat a: | Advanced Energy Materials, Vol. 11, issue 24 (June 2021) , art. 2100432, ISSN 1614-6840 |
Preprint 26 p, 656.1 KB |