High-Conductivity Argyrodite Electrolyte with Self-Passivating Stability for Single-Electrolyte All-Solid-State...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• All-solid-state lithium batteries (ASSLBs) offer enhanced safety and energy density.
• Argyrodite-type solid-state electrolytes (SSEs) are cost-effective but have limitations in ionic conductivity and stability.

Purpose of the Study:

• To design a novel SSE with dual halide occupation and Ta5+ substitution.
• To improve ionic conductivity and interfacial compatibility in ASSLBs.

Main Methods:

• Synthesized a novel SSE: Li5.5P0.94Ta0.06S4.5Cl0.75Br0.75.
• Investigated its ionic conductivity and electrochemical stability.
• Fabricated and tested ASSLB devices.

Main Results:

• Achieved high ionic conductivity (12 mS cm-1 at room temperature).
• Demonstrated in situ self-passivating interfacial layers for stability against Li metal anodes and high-voltage cathodes.
• Showcased excellent cycling performance: 100% retention over 200 cycles (0.2C) and 81% over 1200 cycles (0.5C).

Conclusions:

• The novel SSE offers a viable route for high-performance, scalable ASSLBs.
• The single-passivating electrolyte enhances battery safety and longevity.
• This research advances the development of next-generation energy storage solutions.