Assembling All-Solid-State Lithium-Sulfur Batteries with Li₃ N-Protected Anodes

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• All-solid-state batteries offer enhanced safety and energy density.
• Lithium metal anodes are highly reactive, necessitating protective layers to prevent electrolyte degradation.
• Lithium nitride (Li3N) is a promising material for protecting lithium metal anodes.

Purpose of the Study:

• To investigate the efficacy of a Li3N coating on lithium metal anodes in all-solid-state batteries.
• To evaluate the impact of Li3N protection on battery electrochemical performance and cycle life.
• To assess the compatibility of Li3N-coated anodes with a Li7P3S11 solid electrolyte and a composite cathode.

Main Methods:

• Synthesis of sulfur-based solid electrolytes with high ionic conductivity.
• Coating lithium metal anodes with Li3N.
• Fabrication of all-solid-state battery cells using Li3N-coated anodes, Li7P3S11 solid electrolyte, and a quaternary rGO/S/carbon black/Li7P3S11 cathode.
• Electrochemical testing, including cycling performance and capacity retention measurements.

Main Results:

• The Li3N coating effectively protected the lithium metal anode without compromising electrochemical characteristics.
• The protected cell demonstrated extended cycle life compared to the unprotected cell.
• A cell with a Li3N-coated anode achieved a capacity of 306 mAh/g after 120 cycles at 160 mA/g, outperforming the unprotected cell's 260 mAh/g.

Conclusions:

• Li3N coating is a viable strategy for stabilizing lithium metal anodes in all-solid-state batteries.
• This protection method enhances battery cycle life and maintains high electrochemical performance.
• The findings contribute to the development of more durable and efficient solid-state batteries.