Enhanced polysulfide conversion with highly conductive and electrocatalytic iodine-doped Bismuth selenide nanosheets in lithium-sulfur batteries
Li, Mengyao (Universitat de Barcelona. Departament d'Enginyeria Electrònica i Biomèdica)
Yang, Dawei (Institut de Recerca en Energia de Catalunya)
Jacas Biendicho, Jordi (Institut de Recerca en Energia de Catalunya)
Han, Xu (Institut Català de Nanociència i Nanotecnologia)
Zhang, Chaoqi (Universitat de Barcelona. Departament d'Enginyeria Electrònica i Biomèdica)
Liu, Kun (Dalian Maritime University. Institute of Materials and Technology)
Diao, Jiefeng (The University of Texas at Austin. Oden Institute for Computational Engineering and Sciences)
Li, Junshan (Chengdu University. Institute of Advanced Study)
Wang, Jing (State Grid Anhui Ultra High Voltage Company)
Heggen, Marc (Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (Jülich, Alemanya))
Dunin-Borkowski, Rafal E. (Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (Jülich, Alemanya))
Wang, Jiaao (The University of Texas at Austin. Oden Institute for Computational Engineering and Sciences)
Henkelman, Graeme (The University of Texas at Austin. Oden Institute for Computational Engineering and Sciences)
Morante, Joan Ramon (Institut de Recerca en Energia de Catalunya)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Chou, Shulei (Wenzhou University. Institute for Carbon Neutralization)
Cabot i Codina, Andreu (Institució Catalana de Recerca i Estudis Avançats)

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 Agencia Estatal de Investigación PID2020-116093RB-C43 Ministerio de Economía y Competitividad SEV-2017-0706 Agencia Estatal de Investigación 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.
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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

DOI: 10.1002/adfm.202200529

Preprint 35 p, 2.2 MB

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