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Directly Coating a Multifunctional Interlayer on the Cathode via Electrospinning for Advanced Lithium-Sulfur
Yueying Peng, Yiyong Zhang, Yunhui Wang
1Nanoelectrochemistry Laboratory, Department of Chemical Engineering, National Taiwan University of Science and Technology , Taipei 106, Taiwan.
ACS Applied Materials & Interfaces
|August 17, 2017
Summary
Electrospinning creates a protective interlayer for lithium-sulfur batteries, trapping polysulfides to enhance performance and reduce capacity fading for better energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur batteries offer high theoretical energy density.
- Polysulfide dissolution and shuttle effect limit their practical application and cycle life.
Purpose of the Study:
- To develop an effective interlayer for lithium-sulfur batteries.
- To mitigate polysulfide issues and improve battery performance.
Main Methods:
- Electrospinning was used to create a polyacrylonitrile (PAN) and nitrogen-doped carbon black (NC) fiber interlayer.
- This PAN-NC interlayer was directly coated onto the cathode.
Main Results:
- The PAN-NC interlayer demonstrated good electrolyte infiltration and cathode adhesion.
- Nitrogen-doped carbon black effectively trapped polysulfides, enhancing conductivity and affinity.
- The modified cathode achieved an initial discharge capacity of 1279 mAh g⁻¹ and maintained 1030 mAh g⁻¹ after 100 cycles with 0.05% fading per cycle.
Conclusions:
- Directly coating PAN-NC fibers via electrospinning is a promising strategy for high-performance lithium-sulfur batteries.
- The interlayer effectively suppresses polysulfide shuttle, improving capacity retention and material utilization.
