Mass transport and charge transfer through an electrified interface between metallic lithium and solid-state...

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Physics

Background:

• All-solid-state Li-ion batteries offer safe high-energy density storage using metallic Li anodes.
• Understanding the electrode/electrolyte interface is critical for efficient charge and mass transport in these batteries.

Purpose of the Study:

• To investigate the interface between metallic lithium and solid-state electrolytes.
• To elucidate the formation and characteristics of space charge layers at this interface.

Main Methods:

• Spectroscopic ellipsometry to detect space charge depletion layers.
• Impedance measurements to obtain layer parameters.
• Kinetic Monte Carlo simulations to model transport and charge accumulation.

Main Results:

• Detected space charge depletion layers at the metallic Li/solid-state electrolyte interface, contrary to initial expectations.
• Obtained key parameters characterizing these counterintuitive layers.
• Developed a comprehensive model for mass transport and charge accumulation mechanisms.

Conclusions:

• The formation of space charge layers is a key phenomenon at the metallic Li/solid-state electrolyte interface.
• This understanding is vital for designing high-performance solid-state batteries.
• Further research into these interfacial layers will accelerate the development of advanced energy storage solutions.