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Enhanced Polysulfide Conversion with Highly Conductive and Electrocatalytic Iodine-Doped Bismuth Selenide Nanosheets in Lithium���Sulfur Batteries

Journal Article


Abstract


  • 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-Bi2Se3), able to solve these limitations by immobilizing the LiPS and catalytically activating the redox conversion at the cathode. The synthesis of I-Bi2Se3 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-Bi2Se3 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-Bi2Se3/S electrodes exhibit outstanding initial capacities up to 1500 mAh g���1 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���2, a high areal capacity of 5.70 mAh cm���2 at 0.1 C is obtained with an electrolyte/sulfur ratio of 12����L mg���1. This work demonstrated that doping is an effective way to optimize the metal selenide catalysts in LSBs.

UOW Authors


  •   Chou, Shulei (external author)

Publication Date


  • 2022

Citation


  • Li, M., Yang, D., Biendicho, J. J., Han, X., Zhang, C., Liu, K., . . . Cabot, A. (2022). Enhanced Polysulfide Conversion with Highly Conductive and Electrocatalytic Iodine-Doped Bismuth Selenide Nanosheets in Lithium���Sulfur Batteries. Advanced Functional Materials, 32(26). doi:10.1002/adfm.202200529

Scopus Eid


  • 2-s2.0-85126854352

Web Of Science Accession Number


Volume


  • 32

Issue


  • 26

Place Of Publication


Abstract


  • 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-Bi2Se3), able to solve these limitations by immobilizing the LiPS and catalytically activating the redox conversion at the cathode. The synthesis of I-Bi2Se3 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-Bi2Se3 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-Bi2Se3/S electrodes exhibit outstanding initial capacities up to 1500 mAh g���1 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���2, a high areal capacity of 5.70 mAh cm���2 at 0.1 C is obtained with an electrolyte/sulfur ratio of 12����L mg���1. This work demonstrated that doping is an effective way to optimize the metal selenide catalysts in LSBs.

UOW Authors


  •   Chou, Shulei (external author)

Publication Date


  • 2022

Citation


  • Li, M., Yang, D., Biendicho, J. J., Han, X., Zhang, C., Liu, K., . . . Cabot, A. (2022). Enhanced Polysulfide Conversion with Highly Conductive and Electrocatalytic Iodine-Doped Bismuth Selenide Nanosheets in Lithium���Sulfur Batteries. Advanced Functional Materials, 32(26). doi:10.1002/adfm.202200529

Scopus Eid


  • 2-s2.0-85126854352

Web Of Science Accession Number


Volume


  • 32

Issue


  • 26

Place Of Publication