From Nanoalloy to Nano-Laminated Interfaces for Highly Stable Alkali-Metal Anodes

Area of Science:

• Materials Science
• Electrochemistry
• Battery Technology

Background:

• Metal anodes offer high energy density but face challenges like dendrite growth and interfacial instability.
• A stable artificial solid electrolyte interphase (SEI) is essential for overcoming these limitations in Li- and Na-metal anodes.

Purpose of the Study:

• To develop and investigate novel organic and inorganic hybrid interfaces for stabilizing Li- and Na-metal anodes.
• To understand the relationship between interface structure, mechanical properties, and electrochemical performance.

Main Methods:

• Fabrication of organic/inorganic hybrid interfaces with tailored compositions.
• Electrochemical testing of Li- and Na-metal anodes with different interface structures.
• Application of a cohesive zone model for mechanistic interpretation.
• Experimental and theoretical investigation of interface mechanical stability.

Main Results:

• Nanoalloy interfaces (1Al2O3-1alucone and 2Al2O3-2alucone) demonstrated superior electrochemical stability for both Li- and Na-metal anodes.
• Optimized interface thicknesses were found to differ for Li- and Na-metal anodes.
• A correlation between mechanical stability and electrochemical performance was established.

Conclusions:

• Organic and inorganic hybrid interfaces, particularly nanoalloy structures, are effective in stabilizing metal anodes.
• Interface mechanical properties play a critical role in the electrochemical performance of alkali-metal anodes.
• This work provides fundamental insights for designing advanced interfaces for high-performance metal batteries.