Holey Graphene/Ferroelectric/Sulfur Composite Cathodes for High-Capacity Lithium-Sulfur Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-sulfur (Li-S) batteries offer high energy density but suffer from capacity fading due to poor conductivity and polysulfide shuttling, especially at high sulfur mass loadings.
• Existing Li-S battery designs struggle with efficient ion/electron transport and volume expansion, limiting their practical use.

Purpose of the Study:

• To develop advanced cathode materials for high-mass-loading Li-S batteries that address capacity fading and polysulfide shuttling.
• To create a solvent-free and binder-free electrode fabrication method using holey graphene.

Main Methods:

• Fabrication of sulfur/ferroelectric nanoparticle/holey graphene (S/FNPs/hG) composite cathodes.
• Utilizing holey graphene as a dry-pressable electrode material for Li-S batteries.
• Incorporating ferroelectric nanoparticles (FNPs) to induce polarization and mitigate polysulfide shuttling.

Main Results:

• The S/FNPs/hG cathodes demonstrated sustainable and ultrahigh specific capacities, reaching up to 1409 mAh/g_s (S/BTO/hG).
• A capacity retention of 90% was achieved for the S/BNTFN/hG battery over 18 cycles.
• High sulfur mass loading (5.72–7.01 mg_s/cm²) resulted in high areal capacities (up to ~10 mAh/cm²) and superior rate capabilities.

Conclusions:

• The developed S/FNPs/hG composite cathodes effectively enhance electron/ion transport and suppress polysulfide shuttling.
• This approach enables high-mass-loading Li-S batteries with excellent capacity retention and energy density.
• The findings suggest a viable pathway for the commercialization of high-performance Li-S batteries.