Tuning Ceramic Surface to Minimize the Ionic Resistance at the Interface between PEO- and LATP-Based Ceramic...

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Batteries

Background:

• All-solid-state batteries promise improved safety and performance over conventional lithium-ion batteries.
• Composite solid electrolytes, combining solid polymer electrolytes (SPE) and ceramic electrolytes (CE), aim for high ionic conductivity and mechanical stability.
• The SPE/CE interface presents a significant challenge to Li-ion transport and overall battery performance.

Purpose of the Study:

• To systematically investigate the impact of chemical and thermal treatments on the SPE/CE interfacial resistance.
• To elucidate the parameters influencing the interfacial barrier in composite solid electrolytes.
• To provide insights for optimizing SPE/CE interfaces and improving experimental reproducibility.

Main Methods:

• Electrochemical impedance spectroscopy (EIS) to quantify interfacial resistance.
• X-ray photoemission spectroscopy (XPS) for surface chemical analysis.
• Systematic study of chemical and thermal treatments on a model LATP-based ceramic electrolyte.

Main Results:

• Identified specific chemical and thermal treatments that effectively reduce SPE/CE interfacial resistance.
• Quantified the influence of these treatments on Li-ion transport kinetics at the interface.
• Provided a deeper understanding of the factors governing the SPE/CE interfacial barrier.

Conclusions:

• Chemical and thermal treatments offer viable strategies for optimizing SPE/CE interfaces in composite solid electrolytes.
• The study provides crucial insights for designing more efficient and reliable all-solid-state batteries.
• Recommendations for experimental precautions are offered to enhance the reproducibility of results.