Enhanced polysulfide conversion with highly conductive and electrocatalytic iodine-doped Bismuth selenide nanosheets in lithium-sulfur batteries

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...

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Detalles Bibliográficos
Autores: Li, Mengyao|||0000-0002-9082-7938, Yang, Dawei|||0000-0002-3842-8286, Jacas Biendicho, Jordi|||0000-0001-5981-6168, Han, Xu|||0000-0001-8319-8830, Zhang, Chaoqi|||0000-0002-0357-235X, Liu, Kun, Diao, Jiefeng|||0000-0001-6976-7689, Li, Junshan|||0000-0002-1482-1972, Wang, Jing, Heggen, Marc|||0000-0002-2646-0078, Dunin-Borkowski, Rafal E.|||0000-0001-8082-0647, Wang, Jiaao|||0000-0002-4944-4951, Henkelman, Graeme|||0000-0002-0336-7153, Morante, Joan Ramon|||0000-0002-4981-4633, Arbiol i Cobos, Jordi|||0000-0002-0695-1726, Chou, Shulei|||0000-0003-1155-6082, Cabot i Codina, Andreu|||0000-0002-7533-3251
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:270827
Acceso en línea:https://ddd.uab.cat/record/270827
https://dx.doi.org/urn:doi:10.1002/adfm.202200529
Access Level:acceso abierto
Palabra clave:Bismuth selenide
Iodine-doped
Lithium polysulfide
Lithium-sulfur batteries
Nanosheets
Descripción
Sumario: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.

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