Self-Assembly Monolayer Inspired Stable Artificial Solid Electrolyte Interphase Design for Next-Generation Lithium...

Area of Science:

• Materials Science
• Electrochemistry
• Battery Technology

Background:

• Lithium metal anodes are ideal for high-energy batteries but suffer from dendrite formation due to high reactivity.
• Existing solid electrolyte interphase (SEI) layers are often unstable, limiting battery cycle life.

Purpose of the Study:

• To develop a facile and effective method for stabilizing lithium metal anodes.
• To create a robust artificial SEI layer that suppresses dendrite growth and enhances battery performance.

Main Methods:

• Dip-coating lithium metal in MPDMS to form an inorganic-rich artificial SEI.
• Electrochemical testing of Li metal anodes with the artificial SEI in carbonate electrolytes.
• Molecular dynamics simulations to investigate SEI mechanisms and dendrite suppression.

Main Results:

• The artificial SEI enabled uniform lithium plating/stripping with low overpotential for over 500 cycles.
• Pristine lithium metal anodes failed within 300 cycles due to increased overpotential.
• Molecular dynamics simulations confirmed the artificial SEI's ability to suppress lithium dendrite formation.

Conclusions:

• The proposed artificial SEI strategy significantly enhances the stability and cycle life of lithium metal anodes.
• This method offers a promising solution for the practical application of high-energy lithium metal batteries.
• The artificial SEI demonstrates compatibility with common cathode materials like LiFePO4 and NCM.