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MoS2@C-Modified Separator as an Efficient Polysulfide Barrier for High-Performance Li-S Batteries
Zi-Jing Shi1, Ya-Wen Tian1, Xin-Ling Wang1
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
ACS Applied Materials & Interfaces
|April 14, 2025
Summary
A novel separator for lithium-sulfur batteries (LSBs) using MoS2@C-modified polypropylene enhances performance by reducing polysulfide shuttle. This modification improves energy density and cycle life for advanced battery applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur batteries (LSBs) show high energy density but suffer from polysulfide shuttle and slow kinetics.
- Commercial application of LSBs is hindered by poor cycle stability and rate capability.
Purpose of the Study:
- To design and fabricate a MoS2@C interlayer-modified polypropylene separator (MoS2@C-PP) for enhanced LSB performance.
- To investigate the role of MoS2 and N-doped carbon in mitigating shuttle effect and accelerating redox kinetics.
Main Methods:
- Modification of commercial polypropylene separators with MoS2@C composite.
- Electrochemical characterization of LSBs using the modified separator, including cycling stability and rate performance tests.
Main Results:
- The MoS2@C-PP separator effectively suppressed the shuttle effect through enhanced polysulfide absorption and C-S bond formation.
- Improved ion transfer and electrolyte penetration were observed due to N-doped carbon.
- LSBs with MoS2@C-PP achieved a discharge capacity of 860.5 mAh g-1 at 0.5 C after 200 cycles and 711.5 mAh g-1 at 2 C.
Conclusions:
- Separator modification with MoS2@C is a viable strategy to boost LSB electrochemical performance.
- The developed MoS2@C-PP separator offers a promising solution for stable and high-performance LSBs.
- This approach accelerates redox kinetics and reduces capacity fading in LSBs.
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