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Title: Phosphate‐functionalized Zirconium Metal–Organic Frameworks for Enhancing Lithium–Sulfur Battery Cycling

Journal Article · · Chemistry - A European Journal
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Department of Chemistry Johns Hopkins University Baltimore MD 21218 United States
  2. Department of Chemistry Johns Hopkins University Baltimore MD 21218 United States, National Institute of Standards and Technology Gaithersburg MD 20899 USA
  3. National Institute of Standards and Technology Gaithersburg MD 20899 USA, Department of Materials Science and Engineering University of Florida Gainesville FL 32611 USA
  4. Department of Chemistry Johns Hopkins University Baltimore MD 21218 United States, Department of Materials Science and Engineering Johns Hopkins University Baltimore MD 21218 United States

Abstract Lithium–sulfur batteries are promising candidates for next‐generation energy storage devices due to their outstanding theoretical energy density. However, they suffer from low sulfur utilization and poor cyclability, greatly limiting their practical implementation. Herein, we adopted a phosphate‐functionalized zirconium metal–organic framework (Zr‐MOF) as a sulfur host. With their porous structure, remarkable electrochemical stability, and synthetic versatility, Zr‐MOFs present great potential in preventing soluble polysulfides from leaching. Phosphate groups were introduced to the framework post‐synthetically since they have shown a strong affinity towards lithium polysulfides and an ability to facilitate Li ion transport. The successful incorporation of phosphate in MOF‐808 was demonstrated by a series of techniques including infrared spectroscopy, solid‐state nuclear magnetic resonance spectroscopy, and X‐ray pair distribution function analysis. When employed in batteries, phosphate‐functionalized Zr‐MOF (MOF‐808‐PO4) exhibits significantly enhanced sulfur utilization and ion diffusion compared to the parent framework, leading to higher capacity and rate capability. The improved capacity retention and inhibited self‐discharge rate also demonstrate effective polysulfide encapsulation utilizing MOF‐808‐PO4. Furthermore, we explored their potential towards high‐density batteries by examining the cycling performance at various sulfur loadings. Our approach to correlate structure with function using hybrid inorganic–organic materials offers new chemical design strategies for advancing battery materials.

Sponsoring Organization:
USDOE
OSTI ID:
1983442
Journal Information:
Chemistry - A European Journal, Journal Name: Chemistry - A European Journal Journal Issue: 40 Vol. 29; ISSN 0947-6539
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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