Quantifying static capacity losses in solid-state battery composites via coulometric titration comparison

Area of Science:

• Electrochemistry
• Materials Science
• Solid-State Batteries

Background:

• Accurate quantification of electrochemically active mass is crucial for solid-state battery performance.
• Existing ex situ methods for assessing cathode active material (CAM) utilization can be time-consuming and may not reflect in situ conditions.
• Developing reliable in situ techniques is essential for optimizing composite cathode design.

Purpose of the Study:

• To present a novel electrochemical method for quantifying static cathode active material (CAM) utilization.
• To determine the fraction of electrochemically active mass within solid-state battery composite cathodes.
• To compare the efficacy of the proposed in situ method against established ex situ techniques.

Main Methods:

• Electrochemical quantification using coulometric titration curves.
• Comparison of CAM behavior in cells with both solid and liquid electrolytes.
• Contrast of results with ex situ analysis employing X-ray diffraction.

Main Results:

• The electrochemical method successfully quantifies static CAM utilization in situ.
• Coulometric titration curves provide a reliable measure of active material fraction.
• Results obtained via the electrochemical method show good agreement with ex situ X-ray diffraction analysis.

Conclusions:

• The developed electrochemical approach offers a viable alternative for in situ CAM utilization assessment.
• This method enhances the understanding of cathode material behavior in solid-state batteries.
• The technique facilitates more accurate characterization and optimization of battery components.