Evaluating Electrochemical Impedance Spectroscopy for SEI Characterization in Lithium and Sodium Metal Batteries

Key Points

• This research aims to improve the understanding of solid electrolyte interphase (SEI) characterization using electrochemical impedance spectroscopy (EIS) in alkali-metal batteries.
• Utilized electrochemical impedance spectroscopy to analyze the SEI in lithium and sodium metal batteries.
• Conducted a comparative analysis of impedance responses observed during the testing of both battery types.
• Employed advanced computational techniques for enhanced interpretation of EIS data.
• Demonstrated a significant correlation between EIS measurements and SEI characteristics in lithium batteries with a p-value < 0.05.
• Found unique impedance responses in sodium batteries, indicating distinct SEI formation behaviors.
• Revealed opportunities for optimizing battery performance through improved SEI understanding.