Stacking-Sequence-Dependent Performance and Interfacial Failure Mechanisms of Bilayer Alloy Anodes in All-Solid-State...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Alloy anodes offer high capacity for all-solid-state batteries (ASSBs), but volume changes cause interfacial failure.
• Composite alloy anodes with multilevel designs can improve conductivity and stability.

Purpose of the Study:

• Investigate how stacking sequence affects structural evolution and electrochemical performance of Si-Al composite anodes.
• Determine the critical factors for rational design of stable and high-performance composite anodes.

Main Methods:

• Fabrication and electrochemical testing of composite electrodes with varying Si and Al layer arrangements.
• Analysis of structural evolution and interfacial properties under cycling conditions.

Main Results:

• Electrode performance is critically dependent on the upper layer's plastic deformability and electrochemical potential.
• Si-upper layer configuration achieved 87.3% initial Coulombic efficiency, outperforming Al-upper (59.3%).

Conclusions:

• Component stacking sequence is crucial for mitigating kinetic limitations in composite alloy anodes.
• Strategic design of anode architecture enhances reversibility, rate capability, and overall stability in ASSBs.