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Pàgina inicial > Articles > Articles publicats > Enhanced polysulfide conversion with highly conductive and electrocatalytic iodine-doped Bismuth selenide nanosheets in lithium-sulfur batteries |
Data: | 2022 |
Resum: | The shuttling behavior and sluggish conversion kinetics of intermediate lithium polysulfides (LiPS) represent the main obstacles to the practical application of lithium-sulfur batteries (LSBs). Herein, an innovative sulfur host is proposed, based on an iodine-doped bismuth selenide (I-BiSe), able to solve these limitations by immobilizing the LiPS and catalytically activating the redox conversion at the cathode. The synthesis of I-BiSe nanosheets is detailed here and their morphology, crystal structure, and composition are thoroughly. Density-functional theory and experimental tools are used to demonstrate that I-BiSe nanosheets are characterized by a proper composition and micro- and nano-structure to facilitate Li diffusion and fast electron transportation, and to provide numerous surface sites with strong LiPS adsorbability and extraordinary catalytic activity. Overall, I-BiSe/S electrodes exhibit outstanding initial capacities up to 1500 mAh g at 0. 1 C and cycling stability over 1000 cycles, with an average capacity decay rate of only 0. 012% per cycle at 1 C. Besides, at a sulfur loading of 5. 2 mg cm, a high areal capacity of 5. 70 mAh cm at 0. 1 C is obtained with an electrolyte/sulfur ratio of 12 µL mg. This work demonstrated that doping is an effective way to optimize the metal selenide catalysts in LSBs. |
Ajuts: | European Commission 823717 Ministerio de Ciencia e Innovación PID2020-116093RB-C43 Ministerio de Economía y Competitividad SEV-2017-0706 Ministerio de Ciencia e Innovación ENE2016-77798-C4-3-R |
Nota: | En la versió preprint no apareix l'autor Jing Wang. |
Nota: | Altres ajuts: IREC and ICN2 are both funded by the CERCA Program/Generalitat de Catalunya. Part of the present work has been performed in the framework of Universitat Autònoma de Barcelona Materials Science Ph.D. program. |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió sotmesa a revisió |
Matèria: | Bismuth selenide ; Iodine-doped ; Lithium polysulfide ; Lithium-sulfur batteries ; Nanosheets |
Publicat a: | Advanced functional materials, Vol. 32, issue 26 (June 2022) , art. 2200529, ISSN 1616-3028 |
Preprint 35 p, 2.2 MB |