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Developing A "Polysulfide-Phobic" Strategy to Restrain Shuttle Effect in Lithium-Sulfur Batteries
Yibo He1,2, Yu Qiao1, Zhi Chang1,2
1Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, 305-8568, Japan.
Angewandte Chemie (International Ed. in English)
|June 19, 2019
Summary
A novel "polysulfide-phobic" interface was developed using 2D VOPO4 sheets to inhibit polysulfide shuttling in lithium-sulfur batteries, significantly enhancing their long-term stability.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- The shuttle effect of polysulfides is a major challenge limiting the performance of lithium-sulfur (Li-S) batteries.
- Existing methods to mitigate this effect often involve complex modifications or external additives.
Purpose of the Study:
- To develop a novel
- polysulfide-phobic
- interface to suppress polysulfide shuttling in Li-S batteries.
- To enhance the long-term cycling stability of Li-S batteries through this interface design.
Main Methods:
- Utilized two-dimensional (2D) VOPO4 sheets as active sites to immobilize polysulfides via V-S bond formation.
- Leveraged the intrinsic Coulomb repulsion between polysulfide anions to create a
- polysulfide-phobic
- surface.
- Employed time/space-resolved operando Raman spectroscopy to provide evidence for the interface evolution.
Main Results:
- Demonstrated the formation of a
- polysulfide-phobic
- interface on 2D VOPO4 sheets.
- Successfully suppressed polysulfide shuttling by integrating this interface into battery separators.
- Achieved superior long-term cycling stability in the modified Li-S batteries.
Conclusions:
- Introduced a novel
- self-defense
- mechanism to create a
- polysulfide-phobic
- surface for inhibiting polysulfide migration.
- This strategy offers new insights and opportunities for developing advanced Li-S batteries with improved durability.