Dynamics of Solid-Electrolyte Interphase Formation on Silicon Electrodes Revealed by Combinatorial Electrochemical...

Area of Science:

• Materials Science
• Electrochemistry
• Battery Technology

Background:

• Solid-electrolyte interphase (SEI) formation on silicon electrodes is critical for next-generation lithium-ion batteries.
• Current characterization methods for SEI are low-throughput, hindering rapid material optimization.
• Understanding SEI properties is essential for improving battery performance and lifespan.

Purpose of the Study:

• To develop a high-throughput screening method for SEI formation protocols on silicon electrodes.
• To investigate the heterogeneous nature and dynamics of SEI electrochemical properties and chemical composition.
• To accelerate the optimization of SEI formation, a key bottleneck in battery manufacturing.

Main Methods:

• Combinatorial screening of SEI formation using a broad experimental space (20 conditions).
• Correlative use of scanning electrochemical cell microscopy (SECCM) and shell-isolated nanoparticles for enhanced Raman spectroscopy (SHINERS).
• Analysis of SEI electrochemical properties and chemical composition evolution with cycling.

Main Results:

• Revealed the heterogeneous nature and dynamics of SEI electrochemical properties and chemical composition on Si electrodes.
• Demonstrated that SEI properties evolve characteristically with the number of battery cycles.
• Successfully screened SEI formation under diverse conditions, highlighting method's efficacy.

Conclusions:

• Correlative SECCM/SHINERS provides a powerful tool for high-throughput screening of battery materials.
• This approach can accelerate the optimization of SEI formation methods for advanced lithium-ion batteries.
• The findings offer insights into SEI heterogeneity and its evolution, crucial for battery design.