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A Combined Ordered Macro‐Mesoporous Architecture Design and Surface Engineering Strategy for High‐Performance Sulfur Immobilizer in Lithium–Sulfur Batteries

Liu, Guihua ; Luo, Dan ; Gao, Rui ; Hu, Yongfeng ; Yu, Aiping ; Chen, Zhongwei

Small (Weinheim an der Bergstrasse, Germany), 2020-09, Vol.16 (37), p.e2001089-n/a [Periódico revisado por pares]

Weinheim: Wiley Subscription Services, Inc

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  • Título:
    A Combined Ordered Macro‐Mesoporous Architecture Design and Surface Engineering Strategy for High‐Performance Sulfur Immobilizer in Lithium–Sulfur Batteries
  • Autor: Liu, Guihua ; Luo, Dan ; Gao, Rui ; Hu, Yongfeng ; Yu, Aiping ; Chen, Zhongwei
  • Assuntos: Architecture ; Cobalt sulfide ; defect engineering ; Design defects ; Energy storage ; Engineering ; Ion diffusion ; Lithium ; Lithium sulfur batteries ; macroporous‐mesoporous ; Nanotechnology ; Polysulfides ; Reaction kinetics ; S vacancy ; Storage batteries ; Strategy ; Sulfur ; Surface defects ; Tetrahedra ; Vacancies
  • É parte de: Small (Weinheim an der Bergstrasse, Germany), 2020-09, Vol.16 (37), p.e2001089-n/a
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: The practical application of lithium–sulfur (Li–S) batteries is hindered by the “shuttle” of lithium polysulfides (LiPS) and sluggish Li–S kinetics issues. Herein, a synergistic strategy combining mesoporous architecture design and defect engineering is proposed to synthesize multifunctional defective 3D ordered mesoporous cobalt sulfide (3DOM N‐Co9S8−x) to address the shuttling and sluggish reaction kinetics of polysulfide in Li–S batteries. The unique 3DOM design provides abundant voids for sulfur storage and enlarged active interfaces that reduce electron/ion diffusion pathways. Meanwhile, X‐ray absorption spectroscopy shows that the surface defect engineering tunes the CoS4 tetrahedra to CoS6 octahedra on Co9S8, endowing abundance of S vacancies on the Co9S8 octahedral sites. The ever‐increasing S vacancies over the course of electrochemical process further promotes the chemical trapping of LiPS and its conversion kinetics, rendering fast and durable Li–S chemistry. Benefiting from these features, the as‐developed 3DOM N‐Co9S8−x/S cathode delivers high areal capacity, superb rate capability, and excellent cyclic stability with ultralow capacity fading rate under raised sulfur loading and low electrolyte content. This design strategy promotes the development of practically viable Li–S batteries and sheds lights on the material engineering in related energy storage application. A combined 3D ordered macro‐mesoporous (3DOM) design and surface engineering strategy is introduced to develop multifunctional N‐Co9S8−x as sulfur immobilizer for lithium–sulfur (Li–S) batteries. The S vacancies significantly promote the trapping of lithium polysulfides and its conversion kinetics, rendering fast and durable Li–S electrochemistry. The 3DOM N‐Co9S8−x/S cathode delivers excellent performance under raised sulfur loading and low electrolyte content.
  • Editor: Weinheim: Wiley Subscription Services, Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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