Methodological optimisation and interpretation of coulometric titration time analysis

Area of Science:

• Materials Science
• Electrochemistry
• Battery Technology

Background:

• Solid-state batteries (SSBs) offer enhanced safety and energy density.
• The solid electrolyte interphase (SEI) is crucial for SSB performance and longevity.
• Coulometric titration time analysis (CTTA) is a developing technique for SEI characterization.

Purpose of the Study:

• To investigate the strengths and limitations of CTTA for SEI characterization.
• To understand the influence of experimental parameters on CTTA results.
• To provide guidance for the optimal use and interpretation of CTTA.

Main Methods:

• Exploration of CTTA under varying experimental conditions.
• Analysis of SEI growth dynamics using CTTA.
• Comparison of CTTA with other SEI characterization techniques.

Main Results:

• CTTA results are highly sensitive to the contact area between the solid electrolyte and current collector.
• Key challenges in comparing CTTA data across different samples were identified.
• Strategies to mitigate these challenges and improve result comparability were proposed.

Conclusions:

• CTTA is a valuable tool for SEI quantification but requires careful experimental control.
• Understanding and addressing the impact of contact area is critical for reliable CTTA.
• This work provides a framework for more robust application of CTTA in battery research.